< protocol > An ITU-T modem protocol for 300 bits per second two-wire full-duplex communications using Frequency Shift Keying modulation .
All modern modems support both V.21 and the close variant, Bell 103.
(1996-07-22)
< protocol > An ITU-T modem protocol for 300 bits per second two-wire full-duplex communications using Frequency Shift Keying modulation .
All modern modems support both V.21 and the close variant, Bell 103.
(1996-07-22)
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