} } V.21 | Define V.21 at Dictionary.com

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v.21 in Technology

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.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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