<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.

Last updated: 1996-07-22

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Nearby terms: V.10 « V.11 « V.17 « V.21 » V.22 » V.22bis » V.23


Copyright Denis Howe 1985

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