Data transmission rate Several different telephone-line modulation techniques are used by fax machines. They are negotiated during the fax-modem handshake, and the fax devices will use the highest data rate that both fax devices support, usually a minimum of 14.4 kbit/s for Group 3 fax.
Data transmission rate Several different telephone-line modulation techniques are used by fax machines. They are negotiated during the fax-modem handshake and the fax devices will use, the highest data rate that both fax devices support, usually a minimum of 14.4 kbit/s for Group 3 fax.