V.32bis/V.32 Modem Software

V.32bis/V.32 Software (Softmodems V32bis/V32)

The transmit and receive functions are called within a single function called V32_isr. This function is called to process received samples and to generate samples to transmit. The V32_init function is called to initialize the V.32/32bis modem. This function initializes the structure which contains all the memory required for the modem. The V.32/32bis modem can be adapted for a variety of sampling rates such as 9600 Hz or 7200Hz. The V.32bis/V.32 modem is designed to process data in 10ms intervals.

Features of V.32/V.32bis Software (Softmodems V.32/V.32bis)

Full duplex mode of operation on switched and 2 wire, point-to-point, leased circuits.
Channel separation is accomplished using echo cancellation techniques.
QAM is used for each channel, with synchronous line transmission at 2400 baud.
Data signaling rates: 14400, 12000, 9600, 7200, and 4800 bps synchronous.
Trellis coding at rates from 7200 to 14000bps for V.32bis.
For V.32, two alternative modulation techniques are used for a signaling rate of 9600bps, one uses 16 carrier states and one uses trellis coding with 32 carrier states.
Exchange of rate sequences is provided during start-up to establish the data rate, coding, and any other special facilities.
The frequency carrier operates at 1800Hz.
Transmitted power levels conform to V.2
The modulation rate is 2400 symbols.

For official ITU-T standard on V.32bis/V.32, click ITU-T, V.32bis Standard, ITU-T, V.32 Standard.

For examples of GAO's Modem Software Architecture, click GAO's Modem Software Architecture.

For a complete list of GAO's Modem Software products, please see GAO's Softmodem List.

SOFTWARE