V.32

A CCITT (ITU) standard for 9600bps modems, with fallback to 4800bps, used over two-wire, dial-up lines or two-wire or four-wire leased lines, with echo canceling to remove any telephone-line echo, and quadrature amplitude modulation.

V.32 encodes four data bits for each baud to give an effective throughput of 9600bps and includes trellis-coded modulation error-correcting techniques. V.32 is the first standard for 9600bps modems using standard lines anywhere in the world.