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<protocol, standard> An ITU-T modem protocol for 300 bps two-wire full-duplex communications using Frequency Shift Keying modulation.
All modern modems support both V.21 and the close variant, Bell 103.
(1996-07-22)
Nearby terms: V.10 « V.11 « V.17 « V.21 » V.22 » V.22bis » V.23
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