Request For Comments - RFC3592

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Network Working Group                                          K. Tesink
Request for Comments: 3592                        Telcordia Technologies
Obsoletes: 2558                                           September 2003
Category: Standards Track


                Definitions of Managed Objects for the
            Synchronous Optical Network/Synchronous Digital
                  Hierarchy (SONET/SDH) Interface Type

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in TCP/IP-based internets.
   In particular, it defines objects for managing Synchronous Optical
   Network/Synchronous Digital Hierarchy (SONET/SDH) interfaces.  This
   document is a companion to the documents that define Managed Objects
   for the DS1/E1/DS2/E2 and DS3/E3 Interface Types.

   This memo replaces RFC 2558.  Changes relative to RFC 2558 are
   summarized in the MIB module's REVISION clause.

Table of Contents

   1.  Conventions ..................................................  2
   2.  The Internet-Standard Management Framework ...................  3
   3.  Overview .....................................................  3
       3.1.  Use of the ifTable .....................................  3
       3.2.  Use of ifTable for SONET/SDH
             Medium/Section/Line Layer ..............................  5
       3.3.  Use of ifTable for SONET/SDH Paths .....................  6
       3.4.  Use of ifTable for SONET/SDH VTs/VCs ...................  7
       3.5.  SONET/SDH Terminology ..................................  7
   4.  Object Definitions ........................................... 15
       4.1.  The SONET/SDH Medium Group ............................. 19
       4.2.  The SONET/SDH Section Group ............................ 23



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             4.2.1.  The SONET/SDH Section Current Group ............ 23
             4.2.2.  The SONET/SDH Section Interval Group ........... 25
       4.3.  The SONET/SDH Line Group ............................... 28
             4.3.1.  The SONET/SDH Line Current Group ............... 28
             4.3.2.  The SONET/SDH Line Interval Group .............. 30
       4.4.  The SONET/SDH Far End Line Group ....................... 32
             4.4.1.  The SONET/SDH Far End Line Current Group ....... 32
             4.4.2.  The SONET/SDH Far End Line Interval Group ...... 34
       4.5.  The SONET/SDH Path Group ............................... 37
             4.5.1.  The SONET/SDH Path Current Group ............... 37
             4.5.2.  The SONET/SDH Path Interval Group .............. 39
       4.6.  The SONET/SDH Far End Path Group ....................... 42
             4.6.1.  The SONET/SDH Far End Path Current Group ....... 42
             4.6.2.  The SONET/SDH Far End Path Interval Group ...... 44
       4.7.  The SONET/SDH Virtual Tributary Group .................. 46
             4.7.1.  The SONET/SDH VT Current Group ................. 46
             4.7.2.  The SONET/SDH VT Interval Group ................ 49
       4.8.  The SONET/SDH Far End VT Group ......................... 51
             4.8.1.  The SONET/SDH Far End VT Current Group ......... 51
             4.8.2.  The SONET/SDH Far End VT Interval Group......... 53
       4.9.  Conformance Information ................................ 56
       4.10. Compliance Statements .................................. 56
   5.  Acknowledgments .............................................. 65
   6.  Security Considerations ...................................... 65
   7.  References ................................................... 66
       7.1.  Normative References ................................... 66
       7.2.  Informative References ................................. 68
   8.  Intellectual Property Statement .............................. 68
   Appendix A: The delay-line approach to statistics collection ..... 69
   Appendix B: RFC 1595 SES interpretation .......................... 71
   Author's Address ................................................. 72
   Full Copyright Statement ......................................... 73

1.  Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL", when they appear in this document, are to be interpreted
   as described in BCP 14, RFC 2119 [RFC2119].












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2.  The Internet-Standard Management Framework

   For a detailed overview of the documents that describe the current
   Internet-Standard Management Framework, please refer to section 7 of
   RFC 3410 [RFC3410].

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  MIB objects are generally
   accessed through the Simple Network Management Protocol (SNMP).
   Objects in the MIB are defined using the mechanisms defined in the
   Structure of Management Information (SMI).  This memo specifies a MIB
   module that is compliant to the SMIv2, which is described in STD 58,
   RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
   [RFC2580].

   Textual conventions used in this document are defined in RFC 2579
   [RFC2579] and RFC 3593 [RFC3593].

3.  Overview

   These objects are used when the particular media being used to
   realize an interface is a SONET/SDH interface.  At present, this
   applies to these values of the ifType variable in the Internet-
   standard MIB:

      sonet (39), sonetPath (50), sonetVT (51)

   The definitions contained herein are based on the SONET/SDH
   specifications in ANSI T1.105 and T1.106-1988
   [T1.105a][T1.105b][T1.106] and CCITT G.707, 708, 709, and G.783
   [G.707][G.708][G.709][G.783].

3.1.  Use of the ifTable

   This section specifies how the MIB II interfaces group, as defined in
   [RFC2863], is used for SONET/SDH interfaces.  The SONET/SDH layers
   support several multiplexing possibilities.

   For example in SONET, an Synchronous Transport Signal 3 (STS-3) has 3
   SONET Paths, and a STS-3c has 1 SONET Path.  Another example could be
   a STS-12 having 4 SONET STS-3c Paths.  Similarly, a SONET Synchronous
   Payload Envelope (SPE) can carry many Virtual Tributaries (VTs), for
   example, one SONET SPE can carry 28 VT1.5s.  It is important to note
   that an SPE and a VT in SONET is collectively referred to as a
   Virtual Container (VC) in SDH.  Also, an STS is called Synchronous
   Transport Module (STM) in SDH.





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   Not all SONET/SDH equipment terminates all SONET/SDH layers. For
   example, a SONET/SDH STE regenerator terminates SONET/SDH Sections
   only, and is transparent for all layers above that. SONET/SDH Add-
   Drop multiplexers and Digital Cross Connect Systems terminate
   SONET/SDH Lines.  SONET/SDH Terminal Multiplexers may also terminate
   SONET/SDH Paths and VTs/VCs.

   MIB II [RFC1213], as extended by [RFC2863], accommodates these cases
   by appropriate use of the MIB II system group, and the interfaces
   group.  The system group can name and describe the type of managed
   resource.  The interfaces group defines which SONET/SDH layers apply,
   how these layers are configured and multiplexed.  This is achieved by
   proper representation of SONET/SDH Layers by ifEntries as defined in
   [RFC2863], as follows:

    _____________________________
   |             |          |    |  >
   |             |          |    |  |
   |    VT 1     |..........|VT K|   > K ifEntries
   |             |          |    |  |
   |_____________|__________|____|  >
   |               |      |      |  >
   |               |      |      |  |
   |    Path 1     |......|Path L|   > L ifEntries
   |               |      |      |  |
   |_______________|______|______|  >
   |                             |  >
   |                             |  |
   |    Line                     |  |
   |                             |  |
   |_____________________________|  |
   |                             |  |
   |                             |  |
   |    Section Layer            |   > 1 ifEntry
   |                             |  |
   |_____________________________|  |
   |                             |  |
   |                             |  |
   |    Physical Medium Layer    |  |
   |                             |  |
   |_____________________________|  >

   Use of ifTable for a SONET/SDH port

   The exact configuration and multiplexing of the layers is maintained
   in the ifStackTable [RFC2863] and in the ifInvStackTable [RFC2864].





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3.2.  Use of ifTable for SONET/SDH Medium/Section/Line Layer

   Only the ifGeneralInformationGroup needs to be supported.

   ifTable Object    Use for combined SONET/SDH
                     Medium/Section/Line Layer
   =====================================================================
    ifIndex           Interface index.

    ifDescr           SONET/SDH Medium/Section/Line

    ifType            sonet(39)

    ifSpeed           Speed of line rate for SONET/SDH,
                      (e.g., 155520000 bps).

    ifPhysAddress     The value of the Circuit Identifier.
                      If no Circuit Identifier has been assigned
                      this object should have an octet string with
                      zero length.

    ifAdminStatus     May be implemented with read-only access.
                      The desired administrative status of the
                      interface.

    ifOperStatus      The value testing(3) is not used.
                      This object assumes the value down(2),
                      if the objects sonetSectionCurrentStatus
                      and sonetLineCurrentStatus have
                      any other value than sonetSectionNoDefect(1)
                      and sonetLineNoDefect(1), respectively.

    ifLastChange      sysUpTime at the last change in ifOperStatus.

    ifName            Textual name of the interface or an OCTET STRING
                      of zero length.

    ifLinkUpDownTrapEnable   Default value is enabled(1).
                             May be implemented with read-only access.

    ifHighSpeed       Speed of line in Mega-bits per second
                      (e.g., 155 Mbps)

    ifConnectorPresent Set to true(1).

    ifAlias            The (non-volatile) alias name for this interface
                       as assigned by the network manager.




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3.3.  Use of ifTable for SONET/SDH Paths

   Only the ifGeneralInformationGroup needs to be supported.

   ifTable Object    Use for SONET/SDH Paths
   =========================================
    ifIndex           Interface index.

    ifDescr           SONET/SDH Path

    ifType            sonetPath(50)

    ifSpeed           set to speed of SONET/SDH path
                      (e.g., an STS-1 path has a
                      rate of 50112000 bps.)

    ifPhysAddress     Circuit Identifier or OCTET STRING of zero length.

    ifAdminStatus     May be implemented with read-only access.
                      The desired administrative status of the
                      interface.

    ifOperStatus      This object assumes the value down(2),
                      if the object sonetPathCurrentStatus has
                      any other value than sonetPathNoDefect(1).

    ifLastChange      sysUpTime at the last change in ifOperStatus.

    ifName            Textual name of the interface or an OCTET STRING
                      of zero length.

    ifLinkUpDownTrapEnable   Default value is disabled(2).
                             May be implemented with read-only access.

    ifHighSpeed       Set to rate of SONET/SDH path
                      in Mega-bits per second.

    ifConnectorPresent Set to false(2).

    ifAlias            The (non-volatile) alias name for this interface
                       as assigned by the network manager.










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3.4.  Use of ifTable for SONET/SDH VTs/VCs

   Only the ifGeneralInformationGroup needs to be supported.

   ifTable Object    Use for SONET/SDH VTs/VCs
   ===========================================
    ifIndex           Interface index.

    ifDescr           SONET/SDH VT/VC

    ifType            sonetVT(51)

    ifSpeed           Set to speed of VT/VC
                      (e.g., a VT1.5 has a rate of
                      1728000 bps.)

    ifPhysAddress     Circuit Identifier or OCTET STRING of zero length.

    ifAdminStatus     May be implemented with read-only access.
                      The desired administrative status of the
                      interface.

    ifOperStatus      This object assumes the value down(2),
                      if the object sonetVTCurrentStatus has
                      any other value than sonetVTNoDefect(1).

    ifLastChange      sysUpTime at the last change in ifOperStatus.

    ifName            Textual name of the interface or an OCTET STRING
                      of zero length.

    ifLinkUpDownTrapEnable   Default value is disabled(2).
                             May be implemented with read-only access.

    ifHighSpeed       Set to rate of VT in Mega-bits per second.

    ifConnectorPresent Set to false(2).

    ifAlias            The (non-volatile) alias name for this interface
                       as assigned by the network manager.

3.5.  SONET/SDH Terminology

   The terminology used in this document to describe error conditions on
   a SONET circuit as monitored by a SONET system are from the T1.231
   [T1M1.3][T1.231a][T1.231b].  The terminology used in this document to
   describe error conditions on a SDH circuit as monitored by a SDH
   system are from the CCITT G.783 [G.783].  Only the SONET Performance



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   Monitoring terminology is defined in this document.  The definitions
   for SDH Performance Monitoring terms are similar but not identical,
   and they can be found in [G.783].  If the definition in this document
   does not match the definition in the T1.231 document, the implementer
   should follow the definition described in this document.  In some
   cases other or additional references are used as compared with the
   ones cited above.  This will be indicated in the text.

   Section Loss Of Frame Failure (Out of Frame Event, Severely
      Errored Frame Defect) An Out of Frame (OOF) event (or Severely
      Errored Frame defect) is the occurrence of four contiguous errored
      frame alignment words.  A frame alignment word occupies the A1 and
      A2 bytes of an STS frame, and is defined in T1.105.  The SEF
      defect is terminated when two contiguous error-free frame words
      are detected.  Any implementation of the frame recovery circuitry
      which achieves realignment following an OOF within the 250
      microsecond (two frames) interval implied by this definition is
      acceptable.

      A Loss of Frame (LOF) defect is declared when an OOF/SEF defect
      persists for a period of 3 milliseconds.  The LOF defect is
      terminated when the incoming signal remains continuously in-frame
      for a period of 1 ms to 3 ms.

      A LOF failure is declared when the LOF defect persists for a
      period of 2.5 +/- 0.5 seconds, except when an LOS defect or
      failure is present.  The LOF failure is cleared when the LOS
      failure is declared, or when the LOF defect is absent for 10 +/-
      0.5 seconds.

   Loss of Signal
      The Loss of Signal (LOS) defect is declared when no transitions
      are detected on the incoming signal (before descrambling).  The
      LOS defect is detected  upon observing 2.3 to 100 microseconds of
      no transitions.  The LOS defect is cleared after a 125 microsecond
      interval (one frame) during which no LOS defect is detected.

      The LOS failure is declared when the LOS defect persists for a
      period of 2.5 +/- 0.5 seconds, or if LOS defect is present when
      the criteria for LOF failure declaration have been met.  The LOS
      failure is cleared when the LOS defect is absent for a period of
      10 +/- 0.5 seconds.  Declaration of LOS failure clears any
      existing LOF failure.  Clearing the LOS failure allows immediate
      declaration of the LOF failure if conditions warrant.







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   STS-Path Loss of Pointer
      A Loss of Pointer (LOP) defect is declared when either a valid
      pointer is not detected in eight consecutive frames, or when eight
      consecutive frames are detected with the New Data Flag (NDF) set
      to "1001" without a valid concatenation indicator (see ANSI
      T1.105).  A LOP defect is terminated when either a valid pointer
      with a normal NDF set to "0110", or a valid concatenation
      indicator is detected for three contiguous frames.  Incoming STS-
      Path AIS shall not result in the declaration of a LOP defect.

      An STS-Path LOP failure is declared when the STS-Path LOP defect
      persists for a period of 2.5 +/- 0.5 seconds.  A STS-Path LOP
      failure is cleared when the STS-Path LOP defect is absent for 10
      +/- 0.5 seconds.

   VT Loss of Pointer
      A VT LOP defect is declared when either a valid pointer is not
      detected in eight consecutive VT superframes, or when eight
      consecutive VT superframes are detected with the NDF set to "1001"
      without a valid concatenation indicator.  A VT LOP defect is
      terminated when either a valid pointer with a normal NDF set to
      "0110", or a valid concatenation indicator is detected for three
      contiguous VT superframes.  Incoming VT-Path AIS shall not result
      in declaring a VT LOP defect.

      A VT LOP failure is declared when the VT LOP defect persists for
      2.5 +/- 0.5 seconds.  A VT LOP failure is cleared when the VT LOP
      defect is absent for 10 +/- 0.5 seconds.

   Line Alarm Indication Signal
      A Line Alarm Indication Signal (L-AIS) is defined in ANSI T1.105.
      The following criteria are specific to the L-AIS defect:

      -  Line AIS defect is detected as a "111" pattern in bits 6, 7,
         and 8 of the K2 byte in five consecutive frames.

      -  Line AIS defect is terminated when bits 6, 7, and 8 of the K2
         byte do not contain the code "111" for five consecutive frames.

      A Line AIS failure is declared when the Line AIS defect persists
      for a period of 2.5 +/- 0.5 seconds.  A Line AIS failure is
      cleared when the Line AIS defect is absent for 10 +/- 0.5 seconds.

   STS-Path Alarm Indication Signal
      The STS-Path Alarm Indication Signal (AIS) is defined in ANSI
      T1.105 as all ones in bytes H1, H2, and H3 as well as all ones in
      the entire STS SPE.  The following criteria are specific to the
      STS-Path AIS defect:



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      -  STS-Path AIS defect is detected as all ones in bytes H1 and H2
         in three contiguous frames.

      -  The STS-Path AIS defect is terminated when a valid STS Pointer
         is detected with the NDF set to "1001" (inverted) for one
         frame, or  "0110" (normal) for three contiguous frames.

      An STS-Path AIS failure is declared when the STS-Path AIS defect
      persists for 2.5 +/- 0.5 seconds.  An STS-Path AIS failure is
      cleared when the STS-Path AIS defect is absent for 10 +/- 0.5
      seconds.

   VT-Path Alarm Indication Signal
      The VT-Path Alarm Indication Signal (AIS) is only applicable for
      VTs in the floating mode of operation.  VT-Path AIS is used to
      alert the downstream VT Path Terminating Entity (PTE) of an
      upstream failure.  Upon detection of a failure, Line AIS, or STS-
      Path AIS, an STS PTE will generate downstream VT-Path AIS if the
      STS Synchronous Payload Envelope (SPE) is carrying floating VTs.
      VT-Path AIS is specified in ANSI T1.105 as all ones in bytes V1,
      V2, V3, and V4, as well as all ones in the entire VT SPE.  The
      following criteria are specific to VT-Path AIS defect:

      -  VT-Path AIS defect is detected by a VT PTE as all ones in bytes
         V1 and V2 in three contiguous VT superframes.

      -  VT-Path AIS defect is terminated when valid VT pointer with a
         valid VT size is detected with the NDF set to "1001" (inverted)
         for one VT superframe, or "0110" (normal) for three contiguous
         VT superframes are detected.

      A VT-Path AIS failure is declared when the VT-Path AIS defect
      persists for 2.5 +/- 0.5 seconds.  A VT-Path AIS failure is
      cleared when the VT-Path AIS defect is absent for 10 +/- 0.5
      seconds.

   Line Remote Defect Indication
      Line Remote Defect Indication (RDI) (aka Line FERF) signal is the
      occurrence of a "110" pattern in bit positions 6, 7, and 8 of the
      K2 byte in STS-1 #1 of the STS-N signal.  Line RDI is defined in
      ANSI T1.105.  The following criteria are specific to Line RDI
      defect:

      -  Line RDI defect is a "110" code in bits 6, 7, and 8 of the K2
         byte of in STS-1 #1 in x consecutive frames, where x = 5
         [T1.231a][T1.231b] or 10 [T1.231b].





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      -  Line RDI defect is terminated when any code other than "110" is
         detected in bits 6, 7, and 8 of the K2 byte in x consecutive
         frames, where x = 5 [T1.231a][T1.231b] or 10 [T1.231b].

      A Line Remote Failure Indication (RFI) failure is declared when
      the incoming Line RDI defects lasts for 2.5 +/- 0.5 seconds.  The
      Line RFI failure is cleared when no Line RDI defects are detected
      for 10 +/- 0.5 seconds.

   STS-Path Remote Defect Indication
      STS-Path RDI (aka STS-Path FERF) signal shall be generated within
      100 milliseconds by the STS PTE upon detection of an AIS or LOP
      defect.  Transmission of the STS-Path RDI signal shall cease
      within 100 milliseconds when the STS PTE no longer detects STS-
      Path AIS or STS-Path LOP defect.  The STS-Path RDI  shall
      accurately report the presence or absence of STS-Path AIS or STS-
      Path LOP defects.  STS-Path RDI defect is defined in ANSI T1.105.
      The following requirements are specific to the STS-Path RDI
      defect:

      -  STS-Path RDI is detected by all STS PTEs.  STS-Path RDI is
         detected by the upstream STS PTE as a "1" in bit five of the
         Path Status byte (G1) for x consecutive frames, where x = 5
         [T1.231a] or 10 [T1.231b].

      -  Removal of STS-Path Remote Defect Indication is detected by a
         "0" in bit 5 of the G1 byte in x consecutive frames, where x =
         5 [T1.231a] or 10 [T1.231b].

      An STS-Path Remote Failure Indication (RFI) failure is declared
      when the incoming STS-Path RDI defects lasts for 2.5 +/- 0.5
      seconds.  The STS-Path RFI failure is cleared when no STS-Path RDI
      defects are detected for 10 +/- 0.5 seconds.

   VT-Path Remote Defect Indication
   VT Path RDI (aka VT Path FERF) signal shall be generated within 100
      milliseconds by the VT PTE upon detection of a VT-Path AIS or LOP
      defect.  Transmission of the VT-Path RDI signal shall cease within
      100 milliseconds when the VT PTE no longer detects VT-Path AIS or
      VT-Path LOP defect.  The VT-Path RDI  shall accurately report the
      presence or absence of VT-Path AIS or VT-Path LOP defects.  VT-
      Path RDI defect is defined in ANSI T1.105.  The following
      requirements are specific to VT-Path RDI defect:

      -  VT-Path RDI defect is the occurrence of a "1" in bit 4 of the
         VT-Path Overhead byte (V5) in x consecutive frames, where x = 5
         [T1.231a] or 10 [T1.231b].




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      -  VT-Path RDI defect is terminated when a "0" is detected in bit
         4 of the VT-Path Overhead byte (V5) for x consecutive frames,
         where x = 5 [T1.231a] or 10 [T1.231b].

      A VT-Path Remote Failure Indication (RFI) (derived) failure is
      declared when the incoming VT-Path RDI defects lasts for 2.5 +/-
      0.5 seconds.  The VT-Path RFI failure is cleared when no VT-Path
      RDI defects are detected for 10 +/- 0.5 seconds.

   VT-Path Remote Failure Indication
      The VT-Path RFI signal is only required for the case of byte synch
      mapped DS1s where the DS1 frame bit is not mapped.  The VT-Path
      RFI is specified in ANSI T1.105, where it is currently called VT
      path yellow.  When provided, the VT-Path RFI signal is used to
      indicate the occurrence of far-end failures.  When the VT-Path RFI
      is not provided, far-end failures are derived from local timing of
      the VT-Path RDI defect.  The VT-Path RFI failure is declared
      within 5 ms of detecting the incoming VT-Path RFI Signal.  The
      VT-Path Remote Failure Indication (RFI) failure is cleared within
      50 ms of detecting the removal of the incoming VT-Path RFI signal.

   Coding Violation
      Coding Violations (CV) are Bit Interleaved Parity (BIP) errors
      that are detected in the incoming signal.  CV counters are
      incremented for each BIP error detected.  That is, each BIP-8 can
      detect up to eight errors per STS-N frame, with each error
      incrementing the CV counter.  Section CVs shall be collected using
      the BIP-8 in the B1 byte located in the Section Overhead of STS-1
      #1.  Line CVs shall be collected using the BIP-8s in B2 bytes
      located in the Line Overhead of each STS-1 (since all CVs on an
      STS-N line are counted together, this is equivalent to counting
      each error in the BIP-8*N contained in the B2 bytes of the STS-N
      Line Overhead).  Thus, on an STS-N signal, up to 8 x N CVs may
      occur in each frame.  Path CVs shall be collected using the BIP-8
      in the B3 byte of the STS-Path Overhead of the STS SPE.  VT CVs
      shall be collected using the BIP-2 in the V5 overhead byte of the
      floating VT.

   Errored Seconds
      At each layer, an Errored Second (ES) is a second with one or more
      Coding Violations at that layer OR one or more incoming defects
      (e.g., SEF, LOS, AIS, LOP) at that layer has occurred.

   Severely Errored Seconds
      According to [T1M1.3][T1.231a][TR253][GR253][T1.231b] at each
      layer, an Severely Errored Second (SES) is a second with x or more
      CVs at that layer, or a second during which at least one or more
      incoming defects at that layer has occurred.  The values of x in



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      RFC 1595 [RFC1595] were based on [T1M1.3] and [TR253] (see
      Appendix B).  These values have subsequently been relaxed in
      [T1.231a][GR253][T1.231b].  In addition, according to G.826
      [G.826] SESs are measured as a percentage of errored blocks.

      To deal with these sets of definitions this memo defines an object
      sonetSESthresholdSet that determines the correct interpretation of
      SES.  For backward compatibility, if this object is not
      implemented the interpretation of Appendix B shall apply.
      Otherwise, a more recent interpretation is suggested.  An agent is
      not required to support all sets of definitions.

      Note that CV counts should be frozen during SESs.

      Note that if a manager changes the value of this object all SES
      statistics collected prior to this change shall be invalidated.

   Severely Errored Framing Seconds
      A Severely Errored Framing Second (SEFS) is a second containing
      one or more SEF events.  This counter is only counted at the
      Section Layer.

   Unavailable Seconds
      At the Line, Path, and VT layers, an unavailable second is
      calculated by counting the number of seconds that the interface is
      unavailable.  At each layer, the SONET/SDH interface is said to be
      unavailable at the onset of 10 contiguous SESs.  The 10 SESs are
      included in unavailable time.  Once unavailable, the SONET/SDH
      interface becomes available at the onset of 10 contiguous seconds
      with no SESs.  The 10 seconds with no SESs are excluded from
      unavailable time.  With respect to the SONET/SDH error counts at
      each layer, all counters at that layer are incremented while the
      SONET/SDH interface is deemed available at that layer.  While the
      interface is deemed unavailable at that layer, the only count that
      is incremented is UASs at that layer.

      Note that this definition implies that the agent cannot determine
      until after a ten second interval has passed whether a given one-
      second interval belongs to available or unavailable time.  If the
      agent chooses to update the various performance statistics in real
      time then it must be prepared to retroactively reduce the ES, SES,
      and SEFS counts by 10 and increase the UAS count by 10 when it
      determines that available time has been entered.  It must also be
      prepared to reduce the CV count by the number of violations
      counted since the onset of unavailable time.  The agent must be
      similarly prepared to retroactively decrease the UAS count by 10
      and increase the ES and CV counts as necessary upon entering
      available time.  A special case exists when the 10 second period



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      leading to available or unavailable time crosses a 900 second
      statistics window boundary, as the foregoing description implies
      that the CV, ES, SES, SEFS, and UAS counts the PREVIOUS interval
      must be adjusted.  In this case successive GETs of the affected
      sonetPathIntervalSES and sonetPathIntervalUAS objects (and the
      analogous Line and VT objects also) objects will return differing
      values if the first GET occurs during the first few seconds of the
      window.

      According to ANSI T1.231 unavailable time begins at the _onset_ of
      10 contiguous severely errored seconds -- that is, unavailable
      time starts with the _first_ of the 10 contiguous SESs.  Also,
      while an interface is deemed unavailable all counters for that
      interface are frozen except for the UAS count.  It follows that an
      implementation which strictly complies with this standard must
      _not_ increment any counters other than the UAS count -- even
      temporarily -- as a result of anything that happens during those
      10 seconds.  Since changes in the signal state lag the data to
      which they apply by 10 seconds, an ANSI-compliant implementation
      must pass the one-second statistics through a 10-second delay line
      prior to updating any counters.  That can be done by performing
      the following steps at the end of each one second interval.

      i)   Read near/far end CV counter and alarm status flags from the
           hardware.

      ii)  Accumulate the CV counts for the preceding second and compare
           them to the ES and SES threshold for the layer in question.
           Update the signal state and shift the one-second CV counts
           and ES/SES flags into the 10-element delay line.  Note that
           far-end one-second statistics are to be flagged as "absent"
           during any second in which there is an incoming defect at the
           layer in question or at any lower layer.

      iii) Update the current interval statistics using the signal state
           from the _previous_ update cycle and the one-second CV counts
           and ES/SES flags shifted out of the 10-element delay line.

      This approach is further described in Appendix A.  An agent may
      choose to use this approach in lieu of retroactive adjustments to
      the counters.

      In any case, a linkDown trap shall be sent only after the agent
      has determined for certain that the unavailable state has been
      entered, but the time on the trap will be that of the first UAS
      (i.e., 10 seconds earlier).  A linkUp trap shall be handled
      similarly.




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   Unequipped
      If a Path or VT connection is not provisioned (idle) the SONET
      equipment will signal this state by transmitting the Path or VT
      Signal Label as follows:  - byte C2 of the STS Path Overhead equal
      to 0 for an unequipped Path, - byte V5 of the VT Path Overhead
      equal to 0 for an unequipped VT.

   Signal Label Mismatch
      A Path or VT connection is not correctly provisioned if a received
      Path or VT Signal Label mismatch occurs.  A received Signal Label
      is considered mismatched if it does not equal either the locally
      provisioned value or the value 'equipped non-specific' (1 hex).
      Note that any received non-zero Signal Label is considered a
      locally provisioned value of 'equipped non-specific'.  Only in-
      service, provisioned Path Terminating equipment can detect
      mismatched Signal labels.  It is considered provisioned if it has
      been configured for a mapping and has been assigned signals to and
      from which the mapping takes place.  While a Path is unequipped or
      has mismatched signal labels ES/SES counts continue, but these
      conditions do not themselves contribute to ES/SES.

   Circuit Identifier
      This is a character string specified by the circuit vendor, and is
      useful when communicating with the vendor during the
      troubleshooting process.

4.  Object Definitions

   SONET-MIB DEFINITIONS ::= BEGIN

   IMPORTS
       MODULE-IDENTITY, OBJECT-TYPE,
       Integer32, transmission
             FROM SNMPv2-SMI
       DisplayString, TruthValue
             FROM SNMPv2-TC
       MODULE-COMPLIANCE, OBJECT-GROUP
             FROM SNMPv2-CONF
       ifIndex
             FROM IF-MIB
       PerfCurrentCount, PerfIntervalCount
             FROM PerfHist-TC-MIB;

   --  This is the MIB module for the SONET/SDH Interface objects.

   sonetMIB MODULE-IDENTITY
       LAST-UPDATED "200308110000Z"
       ORGANIZATION "IETF AToM MIB Working Group"



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       CONTACT-INFO
         "WG charter:
            http://www.ietf.org/html.charters/atommib-charter.html

          Mailing Lists:
            General Discussion: atommib@research.telcordia.com
            To Subscribe: atommib-request@research.telcordia.com

          Kaj Tesink
          Telcordia Technologies
          Tel: (732) 758-5254
          Fax: (732) 758-2269
          E-mail: kaj@research.telcordia.com."
       DESCRIPTION
         "The MIB module to describe SONET/SDH interface objects.

          Copyright (C) The Internet Society (2003).  This version
          of this MIB module is part of RFC 3592;  see the RFC
          itself for full legal notices."
       REVISION      "200308110000Z"
       DESCRIPTION
           "The key changes made to this MIB module
           since its publication in RFC 2558
           are as follows.

           (1) Corrected typographical error
               (bellcore1991(2) in sonetSESthresholdSet)

           (2) Added support for sts192cSTM64(6) and
               sts768cSTM256(7) in sonetPathCurrentWidth

           (3) Corrected description of the applicability
               of VTs for SDH for improved accuracy

           (4) Added clarification in the SES description that
               CV counts should be frozen during SESs

           (5) Corrected typographical errors:
               - Line Alarm Indication Signal description of the
                 Terminology section (20.5 --> 2.5 seconds)
               - In the Terminology section
                 sonetSESThresholdSet  --> sonetSESthresholdSet
               "
       REVISION      "199810190000Z"
       DESCRIPTION
           "The RFC 2558 version of this MIB module.





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           The key changes made to this MIB module
           since its initial publication in RFC 1595
           are as follows.

           (1) The MODULE-IDENTITY has been updated to reflect the
               changes to the MIB.

           (2) Where applicable, the textual conventions
               PerfCurrentCount and PerfIntervalCount from
               PerfHist-TC-MIB have been used in place of Gauge32.

           (3) An agent now has the option to delay updates to
               the various performance counts in lieu of performing
               retroactive adjustments upon entering into or exiting
               from unavailable time. This implementation option is
               described in Appendix A of this memo.

           (4) In order to make the SONET-MIB more useful for
               circuit provisioning, the formerly read-only objects
               sonetMediumType, sonetMediumLineCoding,
               sonetMediumLineType, and sonetMediumCircuitIdentifier
               have been given a MAX-ACCESS of read-write. The
               MIN-ACCESS remains read-only.

           (5) The DESCRIPTION clause for sonetMediumTimeElapsed has
               been updated to describe its behaviour if the duration
               of the current interval exceeds the maximum value.

           (6) The DESCRIPTION clause for sonetMediumValidIntervals
               has been updated to describe its behaviour when some
               intervals may be unavailable, and the object
               sonetMediumInvalidIntervals has been added to keep
               count of the number of missing intervals (if any).

           (7) The object sonetMediumLoopbackConfig has been added
               to enable or disable loopback configurations.

           (8) Because the error count thresholds for declaring
               severely errored seconds that are specified in ANSI
               T1.231-1993, ITU-T G.826-1995, and ANSI T1.231-1997
               are all different from each other and from the thresholds
               specified in RFC 1595, an enumerated INTEGER object
               sonetSESthresholdSet has been added to allow an agent
               to specify which threshold set is in use. Text has
               been added to Section 3 stating that if this object is
               not implemented the thresholds specified in RFC 1595
               should be assumed, and the table containing those
               thresholds has been moved to Appendix B of this memo.



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           (9) A column with SYNTAX TruthValue has been added to each
               interval table.  The purpose of the additional column
               is to indicate, for each interval, whether the data
               is valid in the sense intended by ANSI T1.231 clause
               9.1.2.2 [T1.231a][T1.231b]. The objects in question are:

                   sonetSectionIntervalValidData
                   sonetLineIntervalValidData
                   sonetFarEndLineIntervalValidData
                   sonetPathIntervalValidData
                   sonetFarEndPathIntervalValidData
                   sonetVTIntervalValidData
                   sonetFarEndVTIntervalValidData

          (10) The ranges for sonetPathCurrentStatus and
               sonetVTCurrentStatus have been made consistent
               with the DESCRIPTION clauses.

          (11) The conformance information has been updated. Previous
               conformance information from RFC 1595 has been
               deprecated. Some typographical errors in the deprecated
               section have been corrected in order to prevent
               MIB compilation errors."

       REVISION      "199401030000Z"
       DESCRIPTION
           "The RFC 1595 version of this MIB module."

       ::= { transmission 39 }

   --  This is the MIB module for the SONET/SDH objects

   sonetObjects      OBJECT IDENTIFIER ::= { sonetMIB 1 }

   sonetObjectsPath  OBJECT IDENTIFIER ::= { sonetMIB 2 }

   sonetObjectsVT    OBJECT IDENTIFIER ::= { sonetMIB 3 }

   -- groups in the SONET/SDH MIB module

   sonetMedium        OBJECT IDENTIFIER ::= { sonetObjects 1 }

   sonetSection       OBJECT IDENTIFIER ::= { sonetObjects 2 }

   sonetLine          OBJECT IDENTIFIER ::= { sonetObjects 3 }

   sonetFarEndLine    OBJECT IDENTIFIER ::= { sonetObjects 4 }




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   sonetPath          OBJECT IDENTIFIER ::= { sonetObjectsPath 1 }

   sonetFarEndPath    OBJECT IDENTIFIER ::= { sonetObjectsPath 2 }

   sonetVT            OBJECT IDENTIFIER ::= { sonetObjectsVT 1 }

   sonetFarEndVT      OBJECT IDENTIFIER ::= { sonetObjectsVT 2 }

   -- the SONET/SDH Medium group

   -- SONET/SDH interfaces for some applications may be electrical
   -- interfaces and not optical interfaces.  This group handles
   -- the configuration information for both optical SONET/SDH
   -- interfaces and electrical SONET/SDH interfaces.

   sonetMediumTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetMediumEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "The SONET/SDH Medium table."
        ::= { sonetMedium 1 }

   sonetMediumEntry OBJECT-TYPE
       SYNTAX  SonetMediumEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "An entry in the SONET/SDH Medium table."
       INDEX   { ifIndex }
        ::= { sonetMediumTable 1 }

   SonetMediumEntry ::=
       SEQUENCE {
            sonetMediumType               INTEGER,
            sonetMediumTimeElapsed        Integer32,
            sonetMediumValidIntervals     Integer32,
            sonetMediumLineCoding         INTEGER,
            sonetMediumLineType           INTEGER,
            sonetMediumCircuitIdentifier  DisplayString,
            sonetMediumInvalidIntervals   Integer32,
            sonetMediumLoopbackConfig     BITS
       }

   sonetMediumType OBJECT-TYPE
       SYNTAX  INTEGER  {
                  sonet(1),
                  sdh(2)



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               }
       MAX-ACCESS  read-write
       STATUS  current
       DESCRIPTION
          "This variable identifies whether a SONET
          or a SDH signal is used across this interface."
       ::= { sonetMediumEntry 1 }

   sonetMediumTimeElapsed OBJECT-TYPE
       SYNTAX  Integer32 (1..900)
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The number of seconds, including partial seconds,
          that have elapsed since the beginning of the current
          measurement period. If, for some reason, such as an
          adjustment in the system's time-of-day clock, the
          current interval exceeds the maximum value, the
          agent will return the maximum value."
       ::= { sonetMediumEntry 2 }

   sonetMediumValidIntervals OBJECT-TYPE
       SYNTAX  Integer32 (0..96)
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The number of previous 15-minute intervals
          for which data was collected.
          A SONET/SDH interface must be capable
          of supporting at least n intervals.
          The minimum value of n is 4.
          The default of n is 32.
          The maximum value of n is 96.
          The value will be <n> unless the measurement was
          (re-)started within the last (<n>*15) minutes, in which
          case the value will be the number of complete 15
          minute intervals for which the agent has at least
          some data. In certain cases (e.g., in the case
          where the agent is a proxy) it is possible that some
          intervals are unavailable.  In this case, this
          interval is the maximum interval number for
          which data is available. "
       ::= { sonetMediumEntry 3 }

   sonetMediumLineCoding OBJECT-TYPE
       SYNTAX  INTEGER {
                   sonetMediumOther(1),
                   sonetMediumB3ZS(2),



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                   sonetMediumCMI(3),
                   sonetMediumNRZ(4),
                   sonetMediumRZ(5)
               }
       MAX-ACCESS  read-write
       STATUS  current
       DESCRIPTION
          "This variable describes the line coding for
          this interface. The B3ZS and CMI are used for
          electrical SONET/SDH signals (STS-1 and STS-3).
          The Non-Return to Zero (NRZ) and the Return
          to Zero are used for optical SONET/SDH signals."
       ::= { sonetMediumEntry 4 }

   sonetMediumLineType OBJECT-TYPE
       SYNTAX  INTEGER {
                   sonetOther(1),
                   sonetShortSingleMode(2),
                   sonetLongSingleMode(3),
                   sonetMultiMode(4),
                   sonetCoax(5),
                   sonetUTP(6)
               }
       MAX-ACCESS  read-write
       STATUS  current
       DESCRIPTION
          "This variable describes the line type for
          this interface. The line types are
          Short and Long Range
          Single Mode fiber or Multi-Mode fiber interfaces,
          and coax and UTP for electrical interfaces.  The
          value sonetOther should be used when the Line Type is
          not one of the listed values."
       ::= { sonetMediumEntry 5 }

   sonetMediumCircuitIdentifier OBJECT-TYPE
       SYNTAX  DisplayString (SIZE (0..255))
       MAX-ACCESS  read-write
       STATUS  current
       DESCRIPTION
          "This variable contains the transmission
          vendor's circuit identifier, for the
          purpose of facilitating troubleshooting.
          Note that the circuit identifier, if available,
          is also represented by ifPhysAddress."
       ::= { sonetMediumEntry 6 }





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   sonetMediumInvalidIntervals OBJECT-TYPE
       SYNTAX  Integer32 (0..96)
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
           "The number of intervals in the range from
           0 to sonetMediumValidIntervals for which no
           data is available. This object will typically
           be zero except in cases where the data for some
           intervals are not available (e.g., in proxy
           situations)."
       ::= { sonetMediumEntry 7 }

   sonetMediumLoopbackConfig OBJECT-TYPE
       SYNTAX      BITS {
                     sonetNoLoop(0),
                     sonetFacilityLoop(1),
                     sonetTerminalLoop(2),
                     sonetOtherLoop(3) }
       MAX-ACCESS  read-write
       STATUS      current
       DESCRIPTION
          "The current loopback state of the SONET/SDH interface.  The
           values mean:

             sonetNoLoop
                Not in the loopback state. A device that is not
                capable of performing a loopback on this interface
                shall always return this value.

             sonetFacilityLoop
                The received signal at this interface is looped back
                out through the corresponding transmitter in the return
                direction.

             sonetTerminalLoop
                The signal that is about to be transmitted is connected
                to the associated incoming receiver.

             sonetOtherLoop
                Loopbacks that are not defined here."

       ::= { sonetMediumEntry 8 }

   sonetSESthresholdSet    OBJECT-TYPE
       SYNTAX   INTEGER {
                  other(1),
                  bellcore1991(2),



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                  ansi1993(3),
                  itu1995(4),
                  ansi1997(5)
                         }
       MAX-ACCESS      read-write
       STATUS          current
       DESCRIPTION
         "An enumerated integer indicating which
          recognized set of SES thresholds that
          the agent uses for determining severely
          errored seconds and unavailable time.

          other(1)
            None of the following.

          bellcore1991(2)
            Bellcore TR-NWT-000253, 1991 [TR253], or
            ANSI T1M1.3/93-005R2, 1993 [T1M1.3].
            See also Appendix B.

          ansi1993(3)
            ANSI T1.231, 1993 [T1.231a], or
            Bellcore GR-253-CORE, Issue 2, 1995 [GR253]

          itu1995(4)
            ITU Recommendation G.826, 1995 [G.826]

          ansi1997(5)
            ANSI T1.231, 1997 [T1.231b]

          If a manager changes the value of this
          object then the SES statistics collected
          prior to this change must be invalidated."
        ::= { sonetMedium 2 }

   -- the SONET/SDH Section group

   -- this group consists of 2 tables:
   -- - the SONET/SDH Section Current Table
   -- - the SONET/SDH Section Interval Table

   -- the SONET/SDH Section Current Table

   -- The SONET/SDH Section
   -- current table contains various statistics
   -- being collected for the current 15 minute interval.





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   sonetSectionCurrentTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetSectionCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "The SONET/SDH Section Current table."
        ::= { sonetSection 1 }

   sonetSectionCurrentEntry OBJECT-TYPE
       SYNTAX  SonetSectionCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "An entry in the SONET/SDH Section Current table."
       INDEX   { ifIndex }
        ::= { sonetSectionCurrentTable 1 }

   SonetSectionCurrentEntry ::=
       SEQUENCE {
           sonetSectionCurrentStatus   Integer32,
           sonetSectionCurrentESs      PerfCurrentCount,
           sonetSectionCurrentSESs     PerfCurrentCount,
           sonetSectionCurrentSEFSs    PerfCurrentCount,
           sonetSectionCurrentCVs      PerfCurrentCount
       }

   sonetSectionCurrentStatus OBJECT-TYPE
       SYNTAX  Integer32 (1..6)
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "This variable indicates the
          status of the interface.
          The sonetSectionCurrentStatus
          is a bit map represented
          as a sum, therefore,
          it can represent multiple defects
          simultaneously.
          The sonetSectionNoDefect should be
          set if and only if
          no other flag is set.

          The various bit positions are:
                   sonetSectionNoDefect
                   sonetSectionLOS
                   sonetSectionLOF"
        ::= { sonetSectionCurrentEntry 1 }




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   sonetSectionCurrentESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The counter associated with the number of Errored
          Seconds encountered by a SONET/SDH
          Section in the current 15 minute interval."
        ::= { sonetSectionCurrentEntry 2 }

   sonetSectionCurrentSESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The counter associated with the number of
          Severely Errored Seconds
          encountered by a SONET/SDH Section in the current 15
          minute interval."
        ::= { sonetSectionCurrentEntry 3 }

   sonetSectionCurrentSEFSs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The counter associated with the number of
          Severely Errored Framing Seconds
          encountered by a SONET/SDH Section in the current
          15 minute interval."
       ::= { sonetSectionCurrentEntry 4 }

   sonetSectionCurrentCVs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The counter associated with the number of Coding
          Violations encountered by a
          SONET/SDH Section in the current 15 minute interval."
        ::= { sonetSectionCurrentEntry 5 }

   -- the SONET/SDH Section Interval Table

   -- The SONET/SDH Section Interval Table
   -- contains various statistics
   -- collected by each system over a maximum
   -- of the previous 24 hours of



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   -- operation.  The past 24 hours may be broken into 96
   -- completed 15 minute intervals.
   -- A system is required to store at
   -- least 4 completed 15 minute interval.
   -- The default value is 32 intervals.

   sonetSectionIntervalTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetSectionIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "The SONET/SDH Section Interval table."
        ::= { sonetSection 2 }

   sonetSectionIntervalEntry OBJECT-TYPE
       SYNTAX  SonetSectionIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "An entry in the SONET/SDH Section Interval table."
       INDEX   { ifIndex,
                 sonetSectionIntervalNumber }
        ::= { sonetSectionIntervalTable 1 }

   SonetSectionIntervalEntry ::=
       SEQUENCE {
            sonetSectionIntervalNumber  Integer32,
            sonetSectionIntervalESs     PerfIntervalCount,
            sonetSectionIntervalSESs    PerfIntervalCount,
            sonetSectionIntervalSEFSs   PerfIntervalCount,
            sonetSectionIntervalCVs     PerfIntervalCount,
            sonetSectionIntervalValidData  TruthValue
       }

   sonetSectionIntervalNumber OBJECT-TYPE
       SYNTAX  Integer32 (1..96)
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
         "A number between 1 and 96, which identifies the
         interval for which the set of statistics is available.
         The interval identified by 1 is the most recently
         completed 15 minute interval,
         and the interval identified
         by N is the interval immediately preceding the
         one identified
         by N-1."
        ::= { sonetSectionIntervalEntry 1 }



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   sonetSectionIntervalESs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The counter associated with the number of
          Errored Seconds encountered
          by a SONET/SDH Section in a
          particular 15-minute interval
          in the past 24 hours."
        ::= { sonetSectionIntervalEntry 2 }

   sonetSectionIntervalSESs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The counter associated with the number of
          Severely Errored Seconds
          encountered by a SONET/SDH Section in a
          particular 15-minute interval
          in the past 24 hours."
       ::= { sonetSectionIntervalEntry 3 }

   sonetSectionIntervalSEFSs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The counter associated with the number of
          Severely Errored Framing Seconds
          encountered by a SONET/SDH Section in a
          particular 15-minute interval
          in the past 24 hours."
       ::= { sonetSectionIntervalEntry 4 }

   sonetSectionIntervalCVs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The counter associated with the number of Coding
          Violations encountered by a
          SONET/SDH Section in a particular 15-minute interval
          in the past 24 hours."
       ::= { sonetSectionIntervalEntry 5 }





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   sonetSectionIntervalValidData OBJECT-TYPE
       SYNTAX  TruthValue
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "This variable indicates if the data for this
           interval is valid."
       ::= { sonetSectionIntervalEntry 6 }

   -- the SONET/SDH Line group

   -- this group consists of 2 tables:
   -- - the SONET/SDH Line Current Table
   -- - the SONET/SDH Line Interval Table

   -- the SONET/SDH Line Current Table

   -- The SONET/SDH Line
   -- current table contains various statistics
   -- being collected for the current 15 minute interval.

   sonetLineCurrentTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetLineCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
         "The SONET/SDH Line Current table."
       ::= { sonetLine 1 }

   sonetLineCurrentEntry OBJECT-TYPE
       SYNTAX  SonetLineCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
         "An entry in the SONET/SDH Line Current table."
       INDEX   { ifIndex }
       ::= { sonetLineCurrentTable 1 }

   SonetLineCurrentEntry ::=
       SEQUENCE {
            sonetLineCurrentStatus    Integer32,
            sonetLineCurrentESs       PerfCurrentCount,
            sonetLineCurrentSESs      PerfCurrentCount,
            sonetLineCurrentCVs       PerfCurrentCount,
            sonetLineCurrentUASs      PerfCurrentCount
        }





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   sonetLineCurrentStatus OBJECT-TYPE
       SYNTAX  Integer32 (1..6)
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "This variable indicates the
          status of the interface.
          The sonetLineCurrentStatus
          is a bit map represented
          as a sum, therefore,
          it can represent multiple defects
          simultaneously.
          The sonetLineNoDefect should be
          set if and only if
          no other flag is set.

          The various bit positions are:
              sonetLineNoDefect
              sonetLineAIS
              sonetLineRDI"
        ::= { sonetLineCurrentEntry 1 }

   sonetLineCurrentESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of Errored
        Seconds encountered by a SONET/SDH
        Line in the current 15 minute interval."
       ::= { sonetLineCurrentEntry 2 }

   sonetLineCurrentSESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of
        Severely Errored Seconds
        encountered by a SONET/SDH Line in the current 15
        minute
        interval."
       ::= { sonetLineCurrentEntry 3 }

   sonetLineCurrentCVs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current



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       DESCRIPTION
        "The counter associated with the number of Coding
        Violations encountered by a
        SONET/SDH Line in the current 15 minute interval."
       ::= { sonetLineCurrentEntry 4 }

   sonetLineCurrentUASs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of
        Unavailable Seconds
        encountered by a SONET/SDH Line in the current 15
        minute
        interval."
       ::= { sonetLineCurrentEntry 5 }

   -- the SONET/SDH Line Interval Table

   -- The SONET/SDH Line Interval Table
   -- contains various statistics
   -- collected by each system over a maximum
   -- of the previous 24 hours of
   -- operation.  The past 24 hours may be broken into 96
   -- completed 15 minute intervals.
   -- A system is required to store at
   -- least 4 completed 15 minute interval.
   -- The default value is 32 intervals.

   sonetLineIntervalTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetLineIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "The SONET/SDH Line Interval table."
        ::= { sonetLine 2 }

   sonetLineIntervalEntry OBJECT-TYPE
       SYNTAX  SonetLineIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "An entry in the SONET/SDH Line Interval table."
      INDEX   { ifIndex,
                sonetLineIntervalNumber }
      ::= { sonetLineIntervalTable 1 }




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   SonetLineIntervalEntry ::=
       SEQUENCE {
           sonetLineIntervalNumber    Integer32,
           sonetLineIntervalESs       PerfIntervalCount,
           sonetLineIntervalSESs      PerfIntervalCount,
           sonetLineIntervalCVs       PerfIntervalCount,
           sonetLineIntervalUASs      PerfIntervalCount,
           sonetLineIntervalValidData TruthValue
       }

   sonetLineIntervalNumber OBJECT-TYPE
       SYNTAX  Integer32 (1..96)
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
           "A number between 1 and 96, which identifies the
           interval for which the set of statistics is available.
           The interval identified by 1 is the most recently
           completed 15 minute interval,
           and the interval identified
           by N is the interval immediately preceding the
           one identified
           by N-1."
        ::= { sonetLineIntervalEntry 1 }

   sonetLineIntervalESs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The counter associated with the number of
          Errored Seconds encountered
          by a SONET/SDH Line in a
          particular 15-minute interval
          in the past 24 hours."
        ::= { sonetLineIntervalEntry 2 }

   sonetLineIntervalSESs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "The counter associated with the number of
          Severely Errored Seconds
          encountered by a SONET/SDH Line in a
          particular 15-minute interval
          in the past 24 hours."
         ::= { sonetLineIntervalEntry 3 }



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   sonetLineIntervalCVs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
         "The counter associated with the number of Coding
         Violations encountered by a
         SONET/SDH Line in a
         particular 15-minute interval
         in the past 24 hours."
       ::= { sonetLineIntervalEntry 4 }

   sonetLineIntervalUASs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
         "The counter associated with the
         number of Unavailable Seconds
         encountered by a SONET/SDH Line in
         a particular 15-minute interval
         in the past 24 hours."
       ::= { sonetLineIntervalEntry 5 }

   sonetLineIntervalValidData OBJECT-TYPE
       SYNTAX  TruthValue
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "This variable indicates if the data for this
           interval is valid."
       ::= { sonetLineIntervalEntry 6 }

   -- The SONET/SDH Far End Line group.
   -- This group may only be implemented by SONET/SDH (LTEs)
   -- systems that provide for a far end block error (FEBE)
   -- information at the SONET/SDH Line Layer.

   -- This group consists of two tables:
   --    SONET/SDH Far End Line Current Table
   --    SONET/SDH Far End Line Interval Table

   -- The SONET/SDH Far End Line Current Table

   -- The SONET/SDH Far End Line Current table contains
   -- various statistics being
   -- collected for the current 15 minute interval.
   -- The statistics are collected from the far end



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   -- block error code (FEBE)
   -- within the third Z2 byte of the Line Overhead
   -- in Broadband ISDN applications.
   -- The definitions are the same as described for
   -- the near-end information.

   sonetFarEndLineCurrentTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetFarEndLineCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
         "The SONET/SDH Far End Line Current table."
       ::= { sonetFarEndLine 1 }

   sonetFarEndLineCurrentEntry OBJECT-TYPE
       SYNTAX  SonetFarEndLineCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
         "An entry in the SONET/SDH Far End Line Current table."
       INDEX   { ifIndex }
       ::= { sonetFarEndLineCurrentTable 1 }

   SonetFarEndLineCurrentEntry ::=
       SEQUENCE {
           sonetFarEndLineCurrentESs       PerfCurrentCount,
           sonetFarEndLineCurrentSESs      PerfCurrentCount,
           sonetFarEndLineCurrentCVs       PerfCurrentCount,
           sonetFarEndLineCurrentUASs      PerfCurrentCount
          }

   sonetFarEndLineCurrentESs OBJECT-TYPE
      SYNTAX  PerfCurrentCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
          "The counter associated with the number of Far
          End Errored Seconds encountered by a SONET/SDH
          interface in the current 15 minute interval."
      ::= { sonetFarEndLineCurrentEntry 1 }

   sonetFarEndLineCurrentSESs OBJECT-TYPE
      SYNTAX  PerfCurrentCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
          "The counter associated with the number of
          Far End Severely Errored Seconds



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          encountered by a SONET/SDH Medium/Section/Line
          interface in the current 15 minute
          interval."
      ::= { sonetFarEndLineCurrentEntry 2 }

   sonetFarEndLineCurrentCVs OBJECT-TYPE
      SYNTAX  PerfCurrentCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
          "The counter associated with the number of
          Far End Coding Violations reported via
          the far end block error count
          encountered by a
          SONET/SDH Medium/Section/Line
          interface in the current 15 minute interval."
      ::= { sonetFarEndLineCurrentEntry 3 }

   sonetFarEndLineCurrentUASs OBJECT-TYPE
      SYNTAX  PerfCurrentCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
          "The counter associated with the number of
          Far End Unavailable Seconds
          encountered by a
          SONET/SDH Medium/Section/Line
          interface in the current 15 minute interval."
      ::= { sonetFarEndLineCurrentEntry 4 }

   -- The SONET/SDH Far End Line Interval Table

   -- The SONET/SDH Far End Line Interval Table
   -- contains various statistics
   -- collected by each system over a maximum
   -- of the previous 24 hours of
   -- operation.  The past 24 hours may be broken into 96
   -- completed 15 minute intervals.
   -- A system is required to store at
   -- least 4 completed 15 minute interval.
   -- The default value is 32 intervals.

   sonetFarEndLineIntervalTable OBJECT-TYPE
      SYNTAX  SEQUENCE OF SonetFarEndLineIntervalEntry
      MAX-ACCESS  not-accessible
      STATUS  current
      DESCRIPTION
         "The SONET/SDH Far End Line Interval table."



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      ::= { sonetFarEndLine 2 }

   sonetFarEndLineIntervalEntry OBJECT-TYPE
      SYNTAX  SonetFarEndLineIntervalEntry
      MAX-ACCESS  not-accessible
      STATUS  current
      DESCRIPTION
        "An entry in the SONET/SDH Far
        End Line Interval table."
      INDEX   { ifIndex,
                sonetFarEndLineIntervalNumber }
      ::= { sonetFarEndLineIntervalTable 1 }

   SonetFarEndLineIntervalEntry ::=
       SEQUENCE {
            sonetFarEndLineIntervalNumber    Integer32,
            sonetFarEndLineIntervalESs       PerfIntervalCount,
            sonetFarEndLineIntervalSESs      PerfIntervalCount,
            sonetFarEndLineIntervalCVs       PerfIntervalCount,
            sonetFarEndLineIntervalUASs      PerfIntervalCount,
            sonetFarEndLineIntervalValidData TruthValue
       }

   sonetFarEndLineIntervalNumber OBJECT-TYPE
      SYNTAX  Integer32 (1..96)
      MAX-ACCESS  not-accessible
      STATUS  current
      DESCRIPTION
            "A number between 1 and 96, which identifies the
            interval for which the set of statistics is available.
            The interval identified by 1 is the most recently
            completed 15 minute interval,
            and the interval identified
            by N is the interval immediately preceding the
            one identified
            by N-1."
      ::= { sonetFarEndLineIntervalEntry 1 }

   sonetFarEndLineIntervalESs OBJECT-TYPE
      SYNTAX  PerfIntervalCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
           "The counter associated with the number of
           Far End Errored Seconds encountered
           by a SONET/SDH Line
           interface in a particular 15-minute interval
           in the past 24 hours."



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     ::= { sonetFarEndLineIntervalEntry 2 }

   sonetFarEndLineIntervalSESs OBJECT-TYPE
      SYNTAX  PerfIntervalCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
           "The counter associated with the number of
           Far End Severely Errored Seconds
           encountered by a SONET/SDH Line
           interface in a particular 15-minute interval
           in the past 24 hours."
     ::= { sonetFarEndLineIntervalEntry 3 }

   sonetFarEndLineIntervalCVs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
            "The counter associated with the number of
            Far End Coding Violations reported via
            the far end block error count
            encountered by a
            SONET/SDH Line
            interface in a particular 15-minute interval
            in the past 24 hours."
       ::= { sonetFarEndLineIntervalEntry 4 }

   sonetFarEndLineIntervalUASs OBJECT-TYPE
      SYNTAX  PerfIntervalCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
          "The counter associated with the number of
          Far End Unavailable Seconds
          encountered by a
          SONET/SDH Line
          interface in a particular 15-minute interval
          in the past 24 hours."
      ::= { sonetFarEndLineIntervalEntry 5 }

   sonetFarEndLineIntervalValidData OBJECT-TYPE
       SYNTAX  TruthValue
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "This variable indicates if the data for this
           interval is valid."



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       ::= { sonetFarEndLineIntervalEntry 6 }

   -- the SONET/SDH Path group

   -- this group consists of 2 tables:
   -- - the SONET/SDH Path Current Table
   -- - the SONET/SDH Path Interval Table

   -- the SONET/SDH Path Current Table

   -- The SONET/SDH Path
   -- current table contains various statistics
   -- being collected for the current 15 minute interval.

   sonetPathCurrentTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetPathCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
        "The SONET/SDH Path Current table."
   ::= { sonetPath 1 }

   sonetPathCurrentEntry OBJECT-TYPE
       SYNTAX  SonetPathCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
        "An entry in the SONET/SDH Path Current table."
       INDEX   { ifIndex }
   ::= { sonetPathCurrentTable 1 }

   SonetPathCurrentEntry ::=
       SEQUENCE {
           sonetPathCurrentWidth      INTEGER,
           sonetPathCurrentStatus     Integer32,
           sonetPathCurrentESs        PerfCurrentCount,
           sonetPathCurrentSESs       PerfCurrentCount,
           sonetPathCurrentCVs        PerfCurrentCount,
           sonetPathCurrentUASs       PerfCurrentCount
       }

   sonetPathCurrentWidth OBJECT-TYPE
       SYNTAX  INTEGER  {
               sts1(1),
               sts3cSTM1(2),
               sts12cSTM4(3),
               sts24c(4),
               sts48cSTM16(5),



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               sts192cSTM64(6),
               sts768cSTM256(7)
        }
       MAX-ACCESS  read-write
       STATUS  current
       DESCRIPTION
        "A value that indicates the type of the SONET/SDH
        Path.  For SONET, the assigned types are
        the STS-Nc SPEs, where N = 1, 3, 12, 24, 48, 192 and 768.
        STS-1 is equal to 51.84 Mbps.  For SDH, the assigned
        types are the STM-Nc VCs, where N = 1, 4, 16, 64 and 256."
   ::= { sonetPathCurrentEntry 1 }

   sonetPathCurrentStatus OBJECT-TYPE
       SYNTAX  Integer32 (1..62)
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
         "This variable indicates the
         status of the interface.
         The sonetPathCurrentStatus
         is a bit map represented
         as a sum, therefore,
         it can represent multiple defects
         simultaneously.
         The sonetPathNoDefect should be
         set if and only if
         no other flag is set.

         The various bit positions are:
               sonetPathNoDefect
               sonetPathSTSLOP
               sonetPathSTSAIS
               sonetPathSTSRDI
              sonetPathUnequipped
              sonetPathSignalLabelMismatch"
   ::= { sonetPathCurrentEntry 2 }

   sonetPathCurrentESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of Errored
        Seconds encountered by a SONET/SDH
        Path in the current 15 minute interval."
   ::= { sonetPathCurrentEntry 3 }




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   sonetPathCurrentSESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of
        Severely Errored Seconds
        encountered by a SONET/SDH Path in the current 15
        minute
        interval."
   ::= { sonetPathCurrentEntry 4 }

   sonetPathCurrentCVs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of Coding
        Violations encountered by a
        SONET/SDH Path in the current 15 minute interval."
   ::= { sonetPathCurrentEntry 5 }

   sonetPathCurrentUASs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of
        Unavailable Seconds
        encountered by a Path in the current
        15 minute interval."
   ::= { sonetPathCurrentEntry 6 }

   -- the SONET/SDH Path Interval Table

   -- The SONET/SDH Path Interval Table
   -- contains various statistics
   -- collected by each system over a maximum
   -- of the previous 24 hours of
   -- operation.  The past 24 hours may be broken into 96
   -- completed 15 minute intervals.
   -- A system is required to store at
   -- least 4 completed 15 minute interval.
   -- The default value is 32 intervals.







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   sonetPathIntervalTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetPathIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
        "The SONET/SDH Path Interval table."
   ::= { sonetPath 2 }

   sonetPathIntervalEntry OBJECT-TYPE
       SYNTAX  SonetPathIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
        "An entry in the SONET/SDH Path Interval table."
       INDEX   { ifIndex,
                 sonetPathIntervalNumber }
   ::= { sonetPathIntervalTable 1 }

   SonetPathIntervalEntry ::=
       SEQUENCE {
            sonetPathIntervalNumber     Integer32,
            sonetPathIntervalESs        PerfIntervalCount,
            sonetPathIntervalSESs       PerfIntervalCount,
            sonetPathIntervalCVs        PerfIntervalCount,
            sonetPathIntervalUASs       PerfIntervalCount,
            sonetPathIntervalValidData  TruthValue
       }

   sonetPathIntervalNumber OBJECT-TYPE
       SYNTAX  Integer32 (1..96)
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "A number between 1 and 96, which identifies the
          interval for which the set of statistics is available.
          The interval identified by 1 is the most recently
          completed 15 minute interval,
          and the interval identified
          by N is the interval immediately preceding the
          one identified
          by N-1."
   ::= { sonetPathIntervalEntry 1 }

   sonetPathIntervalESs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION



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        "The counter associated with the number of
        Errored Seconds encountered
        by a SONET/SDH Path in a
        particular 15-minute interval
        in the past 24 hours."
   ::= { sonetPathIntervalEntry 2 }

   sonetPathIntervalSESs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of
        Severely Errored Seconds
        encountered by a SONET/SDH Path in
        a particular 15-minute interval
        in the past 24 hours."
   ::= { sonetPathIntervalEntry 3 }

   sonetPathIntervalCVs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of Coding
        Violations encountered by a
        SONET/SDH Path in a particular 15-minute interval
        in the past 24 hours."
   ::= { sonetPathIntervalEntry 4 }

   sonetPathIntervalUASs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of
        Unavailable Seconds
        encountered by a Path in a
        particular 15-minute interval
        in the past 24 hours."
   ::= { sonetPathIntervalEntry 5 }

   sonetPathIntervalValidData OBJECT-TYPE
       SYNTAX  TruthValue
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "This variable indicates if the data for this



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           interval is valid."
       ::= { sonetPathIntervalEntry 6 }

   -- The SONET/SDH Far End Path group

   -- This group consists of two tables:
   --  - SONET/SDH Far End Path Current Table
   --  - SONET/SDH Far End Path Interval Table

   -- The SONET/SDH Far End Path Current Table

   -- The SONET/SDH Far End Path Current table
   -- contains various statistics
   -- being collected for the current 15 minute interval.
   -- The statistics are collected from
   -- the far end block error code
   -- (FEBE) within the G1 byte of the Path Overhead.
   -- The definitions are the same as described for
   -- the near-end information.

   sonetFarEndPathCurrentTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetFarEndPathCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
            "The SONET/SDH Far End Path Current table."
       ::= { sonetFarEndPath 1 }

   sonetFarEndPathCurrentEntry OBJECT-TYPE
       SYNTAX  SonetFarEndPathCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
            "An entry in the SONET/SDH Far End Path Current table."
       INDEX   { ifIndex }
       ::= { sonetFarEndPathCurrentTable 1 }

   SonetFarEndPathCurrentEntry ::=
       SEQUENCE {
           sonetFarEndPathCurrentESs       PerfCurrentCount,
           sonetFarEndPathCurrentSESs      PerfCurrentCount,
           sonetFarEndPathCurrentCVs       PerfCurrentCount,
           sonetFarEndPathCurrentUASs      PerfCurrentCount
       }







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   sonetFarEndPathCurrentESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
            "The counter associated with the number of Far
            End Errored Seconds encountered by a SONET/SDH
            interface in the current 15 minute interval."
       ::= { sonetFarEndPathCurrentEntry 1 }

   sonetFarEndPathCurrentSESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
            "The counter associated with the number of
            Far End Severely Errored Seconds
            encountered by a SONET/SDH Path
            interface in the current 15 minute
            interval."
       ::= { sonetFarEndPathCurrentEntry 2 }

   sonetFarEndPathCurrentCVs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
            "The counter associated with the number of
            Far End Coding Violations reported via
            the far end block error count
            encountered by a
            SONET/SDH Path interface in
            the current 15 minute interval."
       ::= { sonetFarEndPathCurrentEntry 3 }

   sonetFarEndPathCurrentUASs OBJECT-TYPE
      SYNTAX  PerfCurrentCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
          "The counter associated with the number of
          Far End Unavailable Seconds
          encountered by a
          SONET/SDH Path interface in
          the current 15 minute interval."
      ::= { sonetFarEndPathCurrentEntry 4 }





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   -- The SONET/SDH Far End Path Interval Table

   -- The SONET/SDH Far End Path Interval Table
   -- contains various statistics
   -- collected by each system over a maximum
   -- of the previous 24 hours of
   -- operation.  The past 24 hours may be broken into 96
   -- completed 15 minute intervals.
   -- A system is required to store at
   -- least 4 completed 15 minute interval.
   -- The default value is 32 intervals.

   sonetFarEndPathIntervalTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetFarEndPathIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
           "The SONET/SDH Far End Path Interval table."
       ::= { sonetFarEndPath 2 }

   sonetFarEndPathIntervalEntry OBJECT-TYPE
       SYNTAX  SonetFarEndPathIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "An entry in the SONET/SDH Far
          End Path Interval table."
       INDEX   { ifIndex,
                 sonetFarEndPathIntervalNumber }
       ::= { sonetFarEndPathIntervalTable 1 }

   SonetFarEndPathIntervalEntry ::=
       SEQUENCE {
            sonetFarEndPathIntervalNumber     Integer32,
            sonetFarEndPathIntervalESs        PerfIntervalCount,
            sonetFarEndPathIntervalSESs       PerfIntervalCount,
            sonetFarEndPathIntervalCVs        PerfIntervalCount,
            sonetFarEndPathIntervalUASs       PerfIntervalCount,
            sonetFarEndPathIntervalValidData  TruthValue
       }

   sonetFarEndPathIntervalNumber OBJECT-TYPE
      SYNTAX  Integer32 (1..96)
      MAX-ACCESS  not-accessible
      STATUS  current
      DESCRIPTION
           "A number between 1 and 96, which identifies the
           interval for which the set of statistics is available.



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           The interval identified by 1 is the most recently
           completed 15 minute interval,
           and the interval identified
           by N is the interval immediately preceding the
           one identified
           by N-1."
      ::= { sonetFarEndPathIntervalEntry 1 }

   sonetFarEndPathIntervalESs OBJECT-TYPE
      SYNTAX  PerfIntervalCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
           "The counter associated with the number of
           Far End Errored Seconds encountered
           by a SONET/SDH Path interface in a
           particular 15-minute interval
           in the past 24 hours."
      ::= { sonetFarEndPathIntervalEntry 2 }

   sonetFarEndPathIntervalSESs OBJECT-TYPE
      SYNTAX  PerfIntervalCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
           "The counter associated with the number of
           Far End Severely Errored Seconds
           encountered by a SONET/SDH Path interface
           in a particular 15-minute interval
           in the past 24 hours."
      ::= { sonetFarEndPathIntervalEntry 3 }

   sonetFarEndPathIntervalCVs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
            "The counter associated with the number of
            Far End Coding Violations reported via
            the far end block error count
            encountered by a
            SONET/SDH Path interface
            in a particular 15-minute interval
            in the past 24 hours."
       ::= { sonetFarEndPathIntervalEntry 4 }






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   sonetFarEndPathIntervalUASs OBJECT-TYPE
      SYNTAX  PerfIntervalCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
          "The counter associated with the number of
          Far End Unavailable Seconds
          encountered by a
          SONET/SDH Path interface in
          a particular 15-minute interval
          in the past 24 hours."
      ::= { sonetFarEndPathIntervalEntry 5 }

   sonetFarEndPathIntervalValidData OBJECT-TYPE
       SYNTAX  TruthValue
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "This variable indicates if the data for this
           interval is valid."
       ::= { sonetFarEndPathIntervalEntry 6 }

   -- the SONET/SDH Virtual Tributary group

   -- this group consists of 2 tables:
   -- - the SONET/SDH VT Current Table
   -- - the SONET/SDH VT Interval Table

   -- Corresponding SDH signals for SONET VTs are
   -- as follows:

   -- A VT1.5 = TU11
   -- A VT2 = TU12
   -- A VT3 = none
   -- none  = TU3
   -- A VT6 = TU2

   -- the SONET/SDH VT Current Table

   -- The SONET/SDH VT current table
   -- contains various statistics
   -- being collected for the
   -- current 15 minute interval.








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   sonetVTCurrentTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetVTCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
        "The SONET/SDH VT Current table."
   ::= { sonetVT 1 }

   sonetVTCurrentEntry OBJECT-TYPE
       SYNTAX  SonetVTCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
        "An entry in the SONET/SDH VT Current table."
       INDEX   { ifIndex }
   ::= { sonetVTCurrentTable 1 }

   SonetVTCurrentEntry ::=
       SEQUENCE {
           sonetVTCurrentWidth      INTEGER,
           sonetVTCurrentStatus     Integer32,
           sonetVTCurrentESs        PerfCurrentCount,
           sonetVTCurrentSESs       PerfCurrentCount,
           sonetVTCurrentCVs        PerfCurrentCount,
           sonetVTCurrentUASs       PerfCurrentCount
       }

   sonetVTCurrentWidth OBJECT-TYPE
       SYNTAX  INTEGER {
               vtWidth15VC11(1),
               vtWidth2VC12(2),
               vtWidth3(3),
               vtWidth6VC2(4),
               vtWidth6c(5)
            }
       MAX-ACCESS  read-write
       STATUS  current
       DESCRIPTION
       "A value that indicates the type of the SONET
        VT and SDH VC.  Assigned widths are
        VT1.5/VC11, VT2/VC12, VT3, VT6/VC2, and VT6c."
   ::= { sonetVTCurrentEntry 1 }









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   sonetVTCurrentStatus OBJECT-TYPE
       SYNTAX  Integer32 (1..126)
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
         "This variable indicates the
         status of the interface.
         The sonetVTCurrentStatus
         is a bit map represented
         as a sum, therefore,
         it can represent multiple defects
         and failures
         simultaneously.
         The sonetVTNoDefect should be
         set if and only if
         no other flag is set.

         The various bit positions are:
               sonetVTNoDefect
               sonetVTLOP
               sonetVTPathAIS
               sonetVTPathRDI
              sonetVTPathRFI
              sonetVTUnequipped
              sonetVTSignalLabelMismatch"
   ::= { sonetVTCurrentEntry 2 }

   sonetVTCurrentESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of Errored
        Seconds encountered by a SONET/SDH
        VT in the current 15 minute interval."
   ::= { sonetVTCurrentEntry 3 }

   sonetVTCurrentSESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of
        Severely Errored Seconds
        encountered by a SONET/SDH VT in the current 15 minute
        interval."
   ::= { sonetVTCurrentEntry 4 }




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   sonetVTCurrentCVs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of Coding
        Violations encountered by a
        SONET/SDH VT in the current 15 minute interval."
   ::= { sonetVTCurrentEntry 5 }

   sonetVTCurrentUASs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of
        Unavailable Seconds
        encountered by a VT in the current
        15 minute interval."
   ::= { sonetVTCurrentEntry 6 }

   -- the SONET/SDH VT Interval Table

   -- The SONET/SDH VT Interval Table
   -- contains various statistics
   -- collected by each system over a maximum
   -- of the previous 24 hours of
   -- operation.  The past 24 hours may be broken into 96
   -- completed 15 minute intervals.
   -- A system is required to store at
   -- least 4 completed 15 minute interval.
   -- The default value is 32 intervals.

   sonetVTIntervalTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetVTIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
        "The SONET/SDH VT Interval table."
   ::= { sonetVT 2 }

   sonetVTIntervalEntry OBJECT-TYPE
       SYNTAX  SonetVTIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
        "An entry in the SONET/SDH VT Interval table."
       INDEX   { ifIndex,



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                 sonetVTIntervalNumber }
   ::= { sonetVTIntervalTable 1 }

   SonetVTIntervalEntry ::=
       SEQUENCE {
           sonetVTIntervalNumber     Integer32,
           sonetVTIntervalESs        PerfIntervalCount,
           sonetVTIntervalSESs       PerfIntervalCount,
           sonetVTIntervalCVs        PerfIntervalCount,
           sonetVTIntervalUASs       PerfIntervalCount,
           sonetVTIntervalValidData  TruthValue
       }

   sonetVTIntervalNumber OBJECT-TYPE
       SYNTAX  Integer32 (1..96)
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
         "A number between 1 and 96, which identifies the
         interval for which the set of statistics is available.
         The interval identified by 1 is the most recently
         completed 15 minute interval,
         and the interval identified
         by N is the interval immediately preceding the
         one identified
         by N-1."
   ::= { sonetVTIntervalEntry 1 }

   sonetVTIntervalESs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of
        Errored Seconds encountered
        by a SONET/SDH VT in a particular 15-minute interval
        in the past 24 hours."
   ::= { sonetVTIntervalEntry 2 }

   sonetVTIntervalSESs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of
        Severely Errored Seconds
        encountered by a SONET/SDH VT
        in a particular 15-minute interval



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        in the past 24 hours."
   ::= { sonetVTIntervalEntry 3 }

   sonetVTIntervalCVs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of Coding
        Violations encountered by a
        SONET/SDH VT in a particular 15-minute interval
        in the past 24 hours."
   ::= { sonetVTIntervalEntry 4 }

   sonetVTIntervalUASs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
        "The counter associated with the number of
        Unavailable Seconds
        encountered by a VT in a particular 15-minute interval
        in the past 24 hours."
   ::= { sonetVTIntervalEntry 5 }

   sonetVTIntervalValidData OBJECT-TYPE
       SYNTAX  TruthValue
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "This variable indicates if the data for this
           interval is valid."
       ::= { sonetVTIntervalEntry 6 }

   -- The SONET/SDH Far End VT group

   -- This group consists of two tables:
   --    SONET/SDH Far End VT Current Table
   --    SONET/SDH Far End VT Interval Table

   -- The SONET/SDH Far End VT Current

   -- The SONET/SDH Far End VT Current table
   -- contains various statistics
   -- being collected for the current 15 minute interval.
   -- The statistics are collected from
   -- the far end block error code
   -- (FEBE) within the G1 byte of the VT Overhead.



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   -- The definitions are the same as described for
   -- the near-end information.

   sonetFarEndVTCurrentTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetFarEndVTCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
           "The SONET/SDH Far End VT Current table."
       ::= { sonetFarEndVT 1 }

   sonetFarEndVTCurrentEntry OBJECT-TYPE
       SYNTAX  SonetFarEndVTCurrentEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
           "An entry in the SONET/SDH Far End VT Current table."
       INDEX   { ifIndex }
       ::= { sonetFarEndVTCurrentTable 1 }

   SonetFarEndVTCurrentEntry ::=
       SEQUENCE {
           sonetFarEndVTCurrentESs       PerfCurrentCount,
           sonetFarEndVTCurrentSESs      PerfCurrentCount,
           sonetFarEndVTCurrentCVs       PerfCurrentCount,
           sonetFarEndVTCurrentUASs      PerfCurrentCount
       }

   sonetFarEndVTCurrentESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
           "The counter associated with the number of Far
           End Errored Seconds encountered by a SONET/SDH
           interface in the current 15 minute interval."
   ::= { sonetFarEndVTCurrentEntry 1 }

   sonetFarEndVTCurrentSESs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
           "The counter associated with the number of
           Far End Severely Errored Seconds
           encountered by a SONET/SDH VT interface
           in the current 15 minute
           interval."



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       ::= { sonetFarEndVTCurrentEntry 2 }

   sonetFarEndVTCurrentCVs OBJECT-TYPE
       SYNTAX  PerfCurrentCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
           "The counter associated with the number of
           Far End Coding Violations reported via
           the far end block error count
           encountered by a
           SONET/SDH VT interface
           in the current 15 minute interval."
       ::= { sonetFarEndVTCurrentEntry 3 }

   sonetFarEndVTCurrentUASs OBJECT-TYPE
      SYNTAX  PerfCurrentCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
         "The counter associated with the number of
         Far End Unavailable Seconds
         encountered by a
         SONET/SDH VT interface
         in the current 15 minute interval."
      ::= { sonetFarEndVTCurrentEntry 4 }

   -- The SONET/SDH Far End VT Interval Table

   -- The SONET/SDH Far End VT Interval Table
   -- contains various statistics
   -- collected by each system over a maximum
   -- of the previous 24 hours of
   -- operation.  The past 24 hours may be broken into 96
   -- completed 15 minute intervals.
   -- A system is required to store at
   -- least 4 completed 15 minute interval.
   -- The default value is 32 intervals.

   sonetFarEndVTIntervalTable OBJECT-TYPE
       SYNTAX  SEQUENCE OF SonetFarEndVTIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "The SONET/SDH Far End VT Interval table."
       ::= { sonetFarEndVT 2 }





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   sonetFarEndVTIntervalEntry OBJECT-TYPE
       SYNTAX  SonetFarEndVTIntervalEntry
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
         "An entry in the SONET/SDH Far
         End VT Interval table."
       INDEX   { ifIndex,
                 sonetFarEndVTIntervalNumber }
       ::= { sonetFarEndVTIntervalTable 1 }

   SonetFarEndVTIntervalEntry ::=
      SEQUENCE {
            sonetFarEndVTIntervalNumber     Integer32,
            sonetFarEndVTIntervalESs        PerfIntervalCount,
            sonetFarEndVTIntervalSESs       PerfIntervalCount,
            sonetFarEndVTIntervalCVs        PerfIntervalCount,
            sonetFarEndVTIntervalUASs       PerfIntervalCount,
            sonetFarEndVTIntervalValidData  TruthValue
       }

   sonetFarEndVTIntervalNumber OBJECT-TYPE
       SYNTAX  Integer32 (1..96)
       MAX-ACCESS  not-accessible
       STATUS  current
       DESCRIPTION
          "A number between 1 and 96, which identifies the
          interval for which the set of statistics is available.
          The interval identified by 1 is the most recently
          completed 15 minute interval,
          and the interval identified
          by N is the interval immediately preceding the
          one identified
          by N-1."
       ::= { sonetFarEndVTIntervalEntry 1 }

   sonetFarEndVTIntervalESs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
             "The counter associated with the number of
             Far End Errored Seconds encountered
             by a SONET/SDH VT interface
             in a particular 15-minute interval
             in the past 24 hours."
      ::= { sonetFarEndVTIntervalEntry 2 }




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   sonetFarEndVTIntervalSESs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
             "The counter associated with the number of
             Far End Severely Errored Seconds
             encountered by a SONET/SDH VT interface
             in a particular 15-minute interval
             in the past 24 hours."
       ::= { sonetFarEndVTIntervalEntry 3 }

   sonetFarEndVTIntervalCVs OBJECT-TYPE
       SYNTAX  PerfIntervalCount
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
            "The counter associated with the number of
            Far End Coding Violations reported via
            the far end block error count
            encountered by a
            SONET/SDH VT interface in a
            particular 15-minute interval
            in the past 24 hours."
       ::= { sonetFarEndVTIntervalEntry 4 }

   sonetFarEndVTIntervalUASs OBJECT-TYPE
      SYNTAX  PerfIntervalCount
      MAX-ACCESS  read-only
      STATUS  current
      DESCRIPTION
          "The counter associated with the number of
          Far End Unavailable Seconds
          encountered by a
          SONET/SDH VT interface in a
          particular 15-minute interval
          in the past 24 hours."
      ::= { sonetFarEndVTIntervalEntry 5 }

   sonetFarEndVTIntervalValidData OBJECT-TYPE
       SYNTAX  TruthValue
       MAX-ACCESS  read-only
       STATUS  current
       DESCRIPTION
          "This variable indicates if the data for this
           interval is valid."
       ::= { sonetFarEndVTIntervalEntry 6 }




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   -- conformance information

   sonetConformance OBJECT IDENTIFIER ::= { sonetMIB 4 }

   sonetGroups      OBJECT IDENTIFIER ::= { sonetConformance 1 }
   sonetCompliances OBJECT IDENTIFIER ::= { sonetConformance 2 }

   -- deprecated compliance statement

   sonetCompliance MODULE-COMPLIANCE
       STATUS  deprecated
       DESCRIPTION
               "The compliance statement for SONET/SDH interfaces."

       MODULE  -- this module
           MANDATORY-GROUPS { sonetMediumStuff, sonetSectionStuff }

           GROUP       sonetLineStuff
           DESCRIPTION
               "Implementation of this group is mandatory for all
                SONET/SDH systems that terminate SONET/SDH Lines,
                Paths or Virtual Tributaries."

           GROUP       sonetFarEndLineStuff
           DESCRIPTION
               "Implementation of this group is optional for all
                SONET/SDH systems that terminate SONET/SDH Lines,
                Paths or Virtual Tributaries, and that
                provide for a far end block error (FEBE)
                information at the SONET/SDH Line Layer."

           GROUP       sonetPathStuff
           DESCRIPTION
               "Implementation of this group is mandatory for all
                SONET/SDH systems that terminate SONET/SDH
                Paths or Virtual Tributaries."

           OBJECT      sonetPathCurrentWidth
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           GROUP       sonetFarEndPathStuff
           DESCRIPTION
               "Implementation of this group is optional for all
                SONET/SDH systems that terminate SONET/SDH
                Paths or Virtual Tributaries, and that process
                Far End information."



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           GROUP       sonetVTStuff
           DESCRIPTION
               "Implementation of this group is mandatory for all
                SONET/SDH systems that terminate SONET/SDH Virtual
                Tributaries."

           OBJECT      sonetVTCurrentWidth
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           GROUP       sonetFarEndVTStuff
           DESCRIPTION
               "Implementation of this group is optional for all
                SONET/SDH systems that terminate the SONET/SDH
                floating Virtual Tributaries, and that process
                Far End information."

       ::= { sonetCompliances 1 }

   -- current compliance statements

   sonetCompliance2 MODULE-COMPLIANCE
       STATUS  current
       DESCRIPTION
               "The compliance statement for SONET/SDH interfaces."

       MODULE  -- this module
           MANDATORY-GROUPS { sonetMediumStuff2, sonetSectionStuff2 }

           OBJECT      sonetMediumType
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT      sonetMediumLineCoding
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT      sonetMediumLineType
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT      sonetMediumCircuitIdentifier
           MIN-ACCESS  read-only
           DESCRIPTION



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               "Write access is not required."

           OBJECT      sonetMediumLoopbackConfig
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT      sonetSESthresholdSet
           MIN-ACCESS  read-only
           DESCRIPTION
             "Write access is not required, and only one
             of the enumerated values need be supported."

           GROUP       sonetLineStuff2
           DESCRIPTION
               "Implementation of this group is mandatory for all
                SONET/SDH systems that terminate SONET/SDH Lines,
                Paths or Virtual Tributaries."

           GROUP       sonetFarEndLineStuff2
           DESCRIPTION
               "Implementation of this group is optional for all
                SONET/SDH systems that terminate SONET/SDH Lines,
                Paths or Virtual Tributaries, and that
                provide for a far end block error (FEBE)
                information at the SONET/SDH Line Layer."

           GROUP       sonetPathStuff2
           DESCRIPTION
               "Implementation of this group is mandatory for all
                SONET/SDH systems that terminate SONET/SDH
                Paths or Virtual Tributaries."

           OBJECT      sonetPathCurrentWidth
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           GROUP       sonetFarEndPathStuff2
           DESCRIPTION
               "Implementation of this group is optional for all
                SONET/SDH systems that terminate SONET/SDH
                Paths or Virtual Tributaries, and that process
                Far End information."

           GROUP       sonetVTStuff2
           DESCRIPTION
               "Implementation of this group is mandatory for all



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                SONET/SDH systems that terminate SONET/SDH Virtual
                Tributaries."

           OBJECT      sonetVTCurrentWidth
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           GROUP       sonetFarEndVTStuff2
           DESCRIPTION
               "Implementation of this group is optional for all
                SONET/SDH systems that terminate the SONET/SDH
                floating Virtual Tributaries, and that process
                Far End information."

       ::= { sonetCompliances 2 }

   -- units of conformance

   -- deprecated groups

   sonetMediumStuff    OBJECT-GROUP
       OBJECTS { sonetMediumType,
                 sonetMediumTimeElapsed,
                 sonetMediumValidIntervals,
                 sonetMediumLineCoding,
                 sonetMediumLineType,
                 sonetMediumCircuitIdentifier }
       STATUS  deprecated
       DESCRIPTION
               "A collection of objects providing configuration
               information applicable to all SONET/SDH interfaces."
       ::= { sonetGroups 1 }

   sonetSectionStuff    OBJECT-GROUP
       OBJECTS { sonetSectionCurrentStatus,
                 sonetSectionCurrentESs,
                 sonetSectionCurrentSESs,
                 sonetSectionCurrentSEFSs,
                 sonetSectionCurrentCVs,
                 sonetSectionIntervalESs,
                 sonetSectionIntervalSESs,
                 sonetSectionIntervalSEFSs,
                 sonetSectionIntervalCVs
    }
       STATUS  deprecated
       DESCRIPTION
               "A collection of objects providing information



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               specific to SONET/SDH Section interfaces."
       ::= { sonetGroups 2 }

   sonetLineStuff    OBJECT-GROUP
       OBJECTS { sonetLineCurrentStatus,
                 sonetLineCurrentESs,
                 sonetLineCurrentSESs,
                 sonetLineCurrentCVs,
                 sonetLineCurrentUASs,
                 sonetLineIntervalESs,
                 sonetLineIntervalSESs,
                 sonetLineIntervalCVs,
                 sonetLineIntervalUASs }
       STATUS  deprecated
       DESCRIPTION
               "A collection of objects providing information
               specific to SONET/SDH Line interfaces."
       ::= { sonetGroups 3 }

   sonetFarEndLineStuff    OBJECT-GROUP
       OBJECTS { sonetFarEndLineCurrentESs,
                 sonetFarEndLineCurrentSESs,
                 sonetFarEndLineCurrentCVs,
                 sonetFarEndLineCurrentUASs,
                 sonetFarEndLineIntervalESs,
                 sonetFarEndLineIntervalSESs,
                 sonetFarEndLineIntervalCVs,
                 sonetFarEndLineIntervalUASs }
       STATUS  deprecated
       DESCRIPTION
               "A collection of objects providing information
               specific to SONET/SDH Line interfaces,
               and maintaining Line Far End information."
       ::= { sonetGroups 4 }

   sonetPathStuff    OBJECT-GROUP
       OBJECTS { sonetPathCurrentWidth,
                 sonetPathCurrentStatus,
                 sonetPathCurrentESs,
                 sonetPathCurrentSESs,
                 sonetPathCurrentCVs,
                 sonetPathCurrentUASs,
                 sonetPathIntervalESs,
                 sonetPathIntervalSESs,
                 sonetPathIntervalCVs,
                 sonetPathIntervalUASs }
       STATUS  deprecated
       DESCRIPTION



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               "A collection of objects providing information
               specific to SONET/SDH Path interfaces."
       ::= { sonetGroups 5 }

   sonetFarEndPathStuff    OBJECT-GROUP
       OBJECTS { sonetFarEndPathCurrentESs,
                 sonetFarEndPathCurrentSESs,
                 sonetFarEndPathCurrentCVs,
                 sonetFarEndPathCurrentUASs,
                 sonetFarEndPathIntervalESs,
                 sonetFarEndPathIntervalSESs,
                 sonetFarEndPathIntervalCVs,
                 sonetFarEndPathIntervalUASs }
       STATUS  deprecated
       DESCRIPTION
               "A collection of objects providing information
               specific to SONET/SDH Path interfaces,
               and maintaining Path Far End information."
       ::= { sonetGroups 6 }

   sonetVTStuff    OBJECT-GROUP
       OBJECTS { sonetVTCurrentWidth,
                 sonetVTCurrentStatus,
                 sonetVTCurrentESs,
                 sonetVTCurrentSESs,
                 sonetVTCurrentCVs,
                 sonetVTCurrentUASs,
                 sonetVTIntervalESs,
                 sonetVTIntervalSESs,
                 sonetVTIntervalCVs,
                 sonetVTIntervalUASs }
       STATUS  deprecated
       DESCRIPTION
               "A collection of objects providing information
               specific to SONET/SDH VT interfaces."
       ::= { sonetGroups 7 }

   sonetFarEndVTStuff    OBJECT-GROUP
       OBJECTS { sonetFarEndVTCurrentESs,
                 sonetFarEndVTCurrentSESs,
                 sonetFarEndVTCurrentCVs,
                 sonetFarEndVTCurrentUASs,
                 sonetFarEndVTIntervalESs,
                 sonetFarEndVTIntervalSESs,
                 sonetFarEndVTIntervalCVs,
                 sonetFarEndVTIntervalUASs }
       STATUS  deprecated
       DESCRIPTION



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               "A collection of objects providing information
               specific to SONET/SDH VT interfaces,
               and maintaining VT Far End information."
       ::= { sonetGroups 8 }

   -- current groups

   sonetMediumStuff2    OBJECT-GROUP
       OBJECTS { sonetMediumType,
                 sonetMediumTimeElapsed,
                 sonetMediumValidIntervals,
                 sonetMediumLineCoding,
                 sonetMediumLineType,
                 sonetMediumCircuitIdentifier,
                 sonetMediumInvalidIntervals,
                 sonetMediumLoopbackConfig,
                 sonetSESthresholdSet }
       STATUS  current
       DESCRIPTION
               "A collection of objects providing configuration
               information applicable to all SONET/SDH interfaces."
       ::= { sonetGroups 9 }

   sonetSectionStuff2    OBJECT-GROUP
       OBJECTS { sonetSectionCurrentStatus,
                 sonetSectionCurrentESs,
                 sonetSectionCurrentSESs,
                 sonetSectionCurrentSEFSs,
                 sonetSectionCurrentCVs,
                 sonetSectionIntervalESs,
                 sonetSectionIntervalSESs,
                 sonetSectionIntervalSEFSs,
                 sonetSectionIntervalCVs,
                 sonetSectionIntervalValidData }
       STATUS  current
       DESCRIPTION
               "A collection of objects providing information
               specific to SONET/SDH Section interfaces."
       ::= { sonetGroups 10 }

   sonetLineStuff2    OBJECT-GROUP
       OBJECTS { sonetLineCurrentStatus,
                 sonetLineCurrentESs,
                 sonetLineCurrentSESs,
                 sonetLineCurrentCVs,
                 sonetLineCurrentUASs,
                 sonetLineIntervalESs,
                 sonetLineIntervalSESs,



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                 sonetLineIntervalCVs,
                 sonetLineIntervalUASs,
                 sonetLineIntervalValidData }
       STATUS  current
       DESCRIPTION
               "A collection of objects providing information
               specific to SONET/SDH Line interfaces."
       ::= { sonetGroups 11 }

   sonetPathStuff2    OBJECT-GROUP
       OBJECTS { sonetPathCurrentWidth,
                 sonetPathCurrentStatus,
                 sonetPathCurrentESs,
                 sonetPathCurrentSESs,
                 sonetPathCurrentCVs,
                 sonetPathCurrentUASs,
                 sonetPathIntervalESs,
                 sonetPathIntervalSESs,
                 sonetPathIntervalCVs,
                 sonetPathIntervalUASs,
                 sonetPathIntervalValidData }
       STATUS  current
       DESCRIPTION
               "A collection of objects providing information
               specific to SONET/SDH Path interfaces."
       ::= { sonetGroups 12 }

   sonetVTStuff2    OBJECT-GROUP
       OBJECTS { sonetVTCurrentWidth,
                 sonetVTCurrentStatus,
                 sonetVTCurrentESs,
                 sonetVTCurrentSESs,
                 sonetVTCurrentCVs,
                 sonetVTCurrentUASs,
                 sonetVTIntervalESs,
                 sonetVTIntervalSESs,
                 sonetVTIntervalCVs,
                 sonetVTIntervalUASs,
                 sonetVTIntervalValidData }
       STATUS  current
       DESCRIPTION
               "A collection of objects providing information
               specific to SONET/SDH VT interfaces."
       ::= { sonetGroups 13 }

   sonetFarEndLineStuff2    OBJECT-GROUP
       OBJECTS { sonetFarEndLineCurrentESs,
                 sonetFarEndLineCurrentSESs,



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                 sonetFarEndLineCurrentCVs,
                 sonetFarEndLineCurrentUASs,
                 sonetFarEndLineIntervalESs,
                 sonetFarEndLineIntervalSESs,
                 sonetFarEndLineIntervalCVs,
                 sonetFarEndLineIntervalUASs,
                 sonetFarEndLineIntervalValidData }
       STATUS  current
       DESCRIPTION
               "A collection of objects providing information
               specific to SONET/SDH Line interfaces,
               and maintaining Line Far End information."
       ::= { sonetGroups 14 }

   sonetFarEndPathStuff2    OBJECT-GROUP
       OBJECTS { sonetFarEndPathCurrentESs,
                 sonetFarEndPathCurrentSESs,
                 sonetFarEndPathCurrentCVs,
                 sonetFarEndPathCurrentUASs,
                 sonetFarEndPathIntervalESs,
                 sonetFarEndPathIntervalSESs,
                 sonetFarEndPathIntervalCVs,
                 sonetFarEndPathIntervalUASs,
                 sonetFarEndPathIntervalValidData }
       STATUS  current
       DESCRIPTION
               "A collection of objects providing information
               specific to SONET/SDH Path interfaces,
               and maintaining Path Far End information."
       ::= { sonetGroups 15 }

   sonetFarEndVTStuff2    OBJECT-GROUP
       OBJECTS { sonetFarEndVTCurrentESs,
                 sonetFarEndVTCurrentSESs,
                 sonetFarEndVTCurrentCVs,
                 sonetFarEndVTCurrentUASs,
                 sonetFarEndVTIntervalESs,
                 sonetFarEndVTIntervalSESs,
                 sonetFarEndVTIntervalCVs,
                 sonetFarEndVTIntervalUASs,
                 sonetFarEndVTIntervalValidData }
       STATUS  current
       DESCRIPTION
               "A collection of objects providing information
               specific to SONET/SDH VT interfaces,
               and maintaining VT Far End information."
       ::= { sonetGroups 16 }




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   END

5.  Acknowledgments

   This specification is a product of the AToM MIB Working Group.  The
   author would like to acknowledge Mike Heard for his many valuable
   contributions to this memo.

6.  Security Considerations

   There are a number of management objects defined in this MIB module
   that have a MAX-ACCESS clause of read-write:  sonetMediumType,
   sonetMediumLineCoding, sonetMediumLineType,
   sonetMediumCircuitIdentifier, sonetMediumLoopbackConfig,
   sonetSESthresholdSet, sonetPathCurrentWidth, and sonetVTCurrentWidth.
   It is possible for writes to these objects to have disruptive effects
   on network operation that range from invalid performance data to
   traffic interruptions.  Users of this MIB module must therefore be
   aware that support for SET operations in a non-secure environment
   without proper protection can have a negative effect on network
   operations.

   The readable objects in this MIB module (i.e., the objects with a
   MAX-ACCESS other than not-accessible) may be considered sensitive in
   some environments since, collectively, they provide extensive
   information about the performance of interfaces in SONET/SDH
   equipment or networks and can reveal some aspects of their
   configuration.  In such environments it is important to control even
   GET and NOTIFY access to these objects and possibly to encrypt the
   values of these objects when sending them over the network via SNMP.

   SNMP versions prior to SNMPv3 did not include adequate security.
   Even if the network itself is secure (for example by using IPSec),
   even then, there is no control as to who on the secure network is
   allowed to access and GET/SET (read/change/create/delete) the objects
   in this MIB module.

   It is RECOMMENDED that implementers consider the security features as
   provided by the SNMPv3 framework (see [RFC3410], section 8),
   including full support for the SNMPv3 cryptographic mechanisms (for
   authentication and privacy).

   Further, deployment of SNMP versions prior to SNMPv3 is NOT
   RECOMMENDED.  Instead, it is RECOMMENDED to deploy SNMPv3 and to
   enable cryptographic security.  It is then a customer/operator
   responsibility to ensure that the SNMP entity giving access to an





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   instance of this MIB module is properly configured to give access to
   the objects only to those principals (users) that have legitimate
   rights to indeed GET or SET (change/create/delete) them.

7.  References

7.1.  Normative References

   [RFC2119]    Bradner, S., "Key words for use in RFCs to Indicate
                Requirements Levels", BCP 14, RFC 2119, March 1997.

   [RFC2578]    McCloghrie, K., Perkins, D. and J. Schoenwaelder,
                "Structure of Management Information Version 2 (SMIv2)",
                STD 58, RFC 2578, April 1999.

   [RFC2579]    McCloghrie, K., Perkins, D. and J. Schoenwaelder,
                "Textual Conventions for SMIv2", STD 58, RFC 2579, April
                1999.

   [RFC2580]    McCloghrie, K., Perkins, D. and J. Schoenwaelder,
                "Conformance Statements for SMIv2", STD 58, RFC 2580,
                April 1999.

   [RFC3593]    Tesink, K., "Textual Conventions for MIB Modules Using
                Performance History Based on 15 Minute Intervals", RFC
                3593, September 2003.

   [T1.105a]    American National Standard for Telecommunications -
                Digital Hierarchy - Optical Interface Rates and Formats
                Specification, ANSI T1.105-1988.

   [T1.105b]    American National Standard for Telecommunications -
                Digital Hierarchy - Optical Interface Rates and Formats
                Specification, ANSI T1.105-1991.

   [T1.106]     American National Standard for Telecommunications -
                Digital Hierarchy - Optical Interface Specification
                (Single-Mode), ANSI T1.106-1988.

   [T1M1.3]     Draft American National Standard for Telecommunications
                - Digital Hierarchy - Layer 1 In-Service Digital
                Transmission Performance Monitoring, T1M1.3/93-005R2,
                July 1993.

   [G.707]      CCITT Recommendation G.707, "Synchronous Digital
                Hierarchy Bit Rates", June 1992.





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   [G.708]      CCITT Recommendation G.708, "Network Node Interface for
                the Synchronous Digital Hierarchy", June 1992.

   [G.709]      CCITT Recommendation G.709, "Synchronous Multiplexing
                Structure", June 1992.

   [G.783]      CCITT Recommendation G.783, "Characteristics of
                Synchronous Digital Hierarchy (SDH) Multiplexing
                Equipment Functional Blocks", November 1992.

   [RFC1213]    McCloghrie, K. and M. Rose, "Management Information Base
                for Network Management of TCP/IP-based internets: MIB-
                II", RFC 1213, March 1991.

   [RFC2863]    McCloghrie, K. and F. Kastenholz, "The Interfaces Group
                MIB", RFC 2863, June 2000.

   [RFC2864]    McCloghrie, K. and G. Hanson, "The Inverted Stack Table
                Extension to the Interfaces Group MIB", RFC 2864, June
                2000.

   [T1.231a]    American National Standard for Telecommunications -
                Digital Hierarchy - Layer 1 In-Service Digital
                Transmission Performance Monitoring, ANSI T1.231-1993,
                September 1993.

   [TR253]      Bellcore TR-NWT-000253, Issue 1, "Synchronous Optical
                Network (SONET) Transport Systems:  Common Generic
                Criteria", December 1991.

   [G.826]      ITU Recommendation G.826, "Error Performance Parameters
                and Objectives for International Constant Bit Rate
                Digital Paths at or above Primary Rate", September 1995
                (COM 13-R57E).

   [GR253]      Bellcore GR-253-CORE, Issue 2, "Synchronous Optical
                Network (SONET) Transport Systems Common Generic
                Criteria", December 1995.

   [T1.231b]    American National Standard for Telecommunications -
                Digital Hierarchy - Layer 1 In-Service Digital
                Transmission Performance Monitoring, ANSI T1.231-1997,
                September 1997.








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7.2.  Informative References

   [RFC1595]    Brown, T. and K. Tesink, "Definitions of Managed Objects
                for the SONET/SDH Interface Type", RFC 1595, March 1994.

   [RFC2495]    Fowler, D., "Definitions of Managed Objects for the DS1,
                E1, DS2 and E2 Interface Types", RFC 2495, January 1999.

   [RFC2496]    Fowler, D., "Definitions of Managed Objects for the
                DS3/E3 Interface Type", RFC 2496, January 1999.

   [RFC2558]    Tesink, K., "Definitions of Managed Objects for the
                SONET/SDH Interface Type", RFC 2558, March 1999.

   [RFC3410]    Case, J., Mundy, R., Partain, D. and B. Stewart,
                "Introduction and Applicability Statements for Internet-
                Standard Management Framework", RFC 3410, December 2002.

8.  Intellectual Property Statement

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; neither does it represent that it
   has made any effort to identify any such rights.  Information on the
   IETF's procedures with respect to rights in standards-track and
   standards-related documentation can be found in BCP-11.  Copies of
   claims of rights made available for publication and any assurances of
   licenses to be made available, or the result of an attempt made to
   obtain a general license or permission for the use of such
   proprietary rights by implementors or users of this specification can
   be obtained from the IETF Secretariat.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights which may cover technology that may be required to practice
   this standard.  Please address the information to the IETF Executive
   Director.












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Appendix A:  The delay-line approach to statistics collection.

   According to ANSI T1.231 unavailable time begins at the onset of 10
   contiguous severely errored seconds -- that is, unavailable time
   starts with the first of the 10 contiguous SESs -- and while an
   interface is deemed unavailable all counters for that interface are
   frozen except for the UAS count.  Since changes in the signal state
   lag the data to which they apply by 10 seconds, an implementation
   which wishes to avoid making retroactive adjustments to the counts
   must pass the the one-second statistics through a 10-second delay
   line prior to updating any counters.  That can be done by performing
   the following steps at the end of each one second interval.

   i)   Read near/far end line and path CV counts and alarm status flags
        from the hardware.

   ii)  Accumulate the CV counts for the preceding second and compare
        them to the ES and SES threshold for the layer in question.
        Update the signal state and shift the one-second CV counts and
        ES/SES flags into the 10-element delay line.  Note that far-end
        one-second statistics are to be flagged as "absent" during any
        second in which there is an incoming defect at the layer in
        question or at any lower layer.

   iii) Update the current interval statistics using the signal state
        from the previous update cycle and the one-second CV counts and
        ES/SES flags shifted out of the 10-element delay line.

   This procedure guarantees that the statistical counters will be
   correctly updated at all times, although they lag real time by 10
   seconds.  It is illustrated in the figure below.  At the end of each
   15 minutes interval the current interval counts are transferred to
   the  most recent interval entry and each interval is shifted up by
   one position, with the oldest being discarded if necessary in order
   to make room.  The current interval counts then start over from zero.
   Note, however, that the signal state calculation does not start anew
   at each interval boundary;  rather, signal state information is
   retained across interval boundaries.













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   +--------------------------------------------------------------+
   |          READ COUNTERS & STATUS INFO FROM HARDWARE           |
   |                                                              |
   |LOS OOF/ SECT  LINE LINE LINE LINE  PATH PATH PATH PATH PATH  |
   |    LOF   CV    AIS  CV   RDI FEBE   AIS  LOP  CV   RDI  CV   |
   +--------------------------------------------------------------+
     |   |     |     |    |    |   |      |    |    |    |    |
     |   |     |     |    |    |   |      |    |    |    |    |
     V   V     V     V    V    V   V      V    V    V    V    V
   +--------------------------------------------------------------+
   | ACCUM ONE-SEC STATS, CHK ERR THRESHOLDS, & UPDT SIGNAL STATE |
   |                                                              |
   |                                                              |
   |                  NEAR END/FAR END       NEAR END/FAR END     |
   |SECT SECT SECT  LINE LINE LINE  LINE   PATH PATH PATH  PATH   |
   |CV   ES   SES    CV   ES   SES AVA/UNA  CV   ES   SES AVA/UNA |
   +--------------------------------------------------------------+
     |    |    |      |    |    |     |      |    |    |     |
     |    |    |      |    |    |     |      |    |    |     |
     V    V    V      V    V    V     |      V    V    V     |
   +-------------+  +-------------+   |    +-------------+   |
   |ONE-SEC DELAY|  |ONE-SEC DELAY|   |    |ONE-SEC DELAY|   |
   | (1 OF 10)   |  | (1 OF 10)   |   |    | (1 OF 10)   |   |
   |CV   ES   SES|  |CV   ES   SES|   |    |CV   ES   SES|   |
   +-------------+  +-------------+   |    +-------------+   |
     |    |    |      |    |    |     |      |    |    |     |
     /    /    /      /    /    /     /      /    /    /     /
     /    /    /      /    /    /     /      /    /    /     /
     |    |    |      |    |    |     |      |    |    |     |
     V    V    V      V    V    V     |      V    V    V     |
   +-------------+  +-------------+   |    +-------------+   |
   |ONE-SEC DELAY|  |ONE-SEC DELAY|   |    |ONE-SEC DELAY|   |
   | (10 OF 10)  |  | (10 OF 10)  |   |    | (10 OF 10)  |   |
   |CV   ES   SES|  |CV   ES   SES|   |    |CV   ES   SES|   |
   +-------------+  +-------------+   |    +-------------+   |
     |    |    |      |    |    |     |      |    |    |     |
     |    |    |      |    |    |     |      |    |    |     |
     V    V    V      V    V    V     V      V    V    V     V
   +--------------------------------------------------------------+
   |              UPDATE STATISTICS COUNTERS                      |
   |                                                              |
   |                   NEAR END/FAR END       NEAR END/FAR END    |
   |   SECTION               LINE                   PATH          |
   | CV ES EFS SES   CV ES EFS SES AS UAS   CV ES EFS SES AS UAS  |
   +--------------------------------------------------------------+

   Note that if such a procedure is adopted there is no current interval
   data for the first ten seconds after a system comes up.



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   noSuchInstance must be returned if a management station attempts to
   access the current interval counters during this time.

   It is an implementation-specific matter whether an agent assumes that
   the initial state of the interface is available or unavailable.

Appendix B - RFC 1595 SES interpretation

   This appendix contains the values for x for the Section, Line, Path,
   and VT Layers as used in [T1M1.3][RFC1595][TR253].

        Value for x for SONET/SDH Section SES Definition

   Rate            x               Minimum Bit Error Rate
   =======================================================
   OC-1             9                      1.5 x 10^-7
   OC-3            16                        1 x 10^-7
   OC-9            47                        1 x 10^-7
   OC-12           63                        1 x 10^-7
   OC-18           94                        1 x 10^-7
   OC-24          125                        1 x 10^-7
   OC-36          187                        1 x 10^-7
   OC-48          249                        1 x 10^-7


        Value for x for SONET/SDH Line SES Definition

   Rate            x               Minimum Bit Error Rate
   =======================================================
   OC-1            12                       2 x 10^-7
   OC-3            32                       2 x 10^-7
   OC-9            47                       2 x 10^-7
   OC-12          124                       2 x 10^-7
   OC-18          186                       2 x 10^-7
   OC-24          248                       2 x 10^-7
   OC-36          370                       2 x 10^-7
   OC-48          494                       2 x 10^-7


        Value for x for SONET/SDH STS-Path SES Definition

   Rate            x               Minimum Bit Error Rate
   =======================================================
   STS-1            9                       1.5 x 10^-7
   STS-3           16                         1 x 10^-7






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        Value for x for SONET/SDH VT-Path SES Definition

   Rate            x               Minimum Bit Error Rate
   =======================================================
   VT1.5            4                       2 x 10^-6
   VT2              6                       2 x 10^-6
   VT3              8                       2 x 10^-6
   VT6             14                       2 x 10^-6

Author's Address

   Kaj Tesink
   Telcordia Technologies
   331 Newman Springs Road
   P.O. Box 7020
   Red Bank, NJ  07701-7020

   Phone: (732) 758-5254
   EMail: kaj@research.telcordia.com
































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Full Copyright Statement

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.



















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©2018 Martin Webb