A 56kbit/s line is a digital connection capable of carrying 56 kilobits per second (kbit/s), or 56,000 bit/s, the data rate of a classical single channel
modems, but the same terminology is used for them. 56kbit/s line Handshaking Raytheon BBN Command and Data modes (modem) Fax demodulator List of interface
to 14.4 kbit/s bidirectional data transfer. Other additional defined data transfer rates are 12.0 kbit/s, 9.6 kbit/s, 7.2 kbit/s, and 4.8 kbit/s. The standard