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:

uzVV.10V.11V.17V.21V.22V.22bisV.23V.24V.25V.25 bis

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