V.27ter Fax Software (V27ter Fax Modem)

The GAO V27ter fax modem software implements the ITU-T V.27ter Recommendation, which is 4800bps and 2400bps modem, used in the general switched telephone network. It is the modulation scheme used in Group 3 facsimile (G3 fax) for image transfer at 4800bps and 2400bps. It consists of transmitting functions and receiving functions which are called to transmit/receive bits in groups of 2 or 3 (referred to as symbols) at a rate of 1200 or 1600 symbols per second respectively.

Features of V.27ter Fax Software (V27ter Fax Modem)

GAO's V.27ter software implements the ITU-T V.27ter recommendation
Uses a data signaling rate of 4800 bps with eight phase differentially encoded modulation.
Operates at a reduced rate of 2400 bps with four phase differentially encoded modulation.
Optional backward channel at modulation rates of up to 75 symbols per second.
Modulation occurs at 1800Hz.
Transmitted power levels conform to V.2.
Modulation rate is 1200 or 1600 symbols.
It consists of transmitting functions and receiving functions which are called to transmit and receive bits in groups of 2 to 3 (referred to as symbols) at a rate of 1200 or 1600 symbols per second respectively.
Highly optimized in C and multi-channel ready.

For official ITU-T standard on V.27ter, click ITU-T: V.27ter Standard.

For a complete list of GAO's Group 3 Fax Software products, click Group 3 Fax.

For information on Fax Relay, please see GAO's Fax Relay Software.

V.27ter Fax Software - Group 3 Fax V.27ter printable pdf version