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.

Last updated: 1996-07-22

Nearby terms:

uz ♦ V ♦ V.10 ♦ V.11 ♦ V.17 ♦ V.21 ♦ V.22 ♦ V.22bis ♦ V.23 ♦ V.24 ♦ V.25 ♦ V.25 bis

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