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V.21

   Also found in: Wikipedia 0.03 sec.

An ITU standard (1964) for asynchronous 0-300 bps full-duplex modems for use on dial-up lines. It uses FSK modulation.

(protocol, standard)V.21 - 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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