V.21




<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.



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uz
V
V.10
V.11
V.17
 Bell 103
International Telecommunications Union
V.21
V series
 V.22
V.22bis
V.23
V.24
V.25