V.32 is an ITU Telecommunication Standardization Sector (ITU-T) standard for modems that are sending and receiving data across phone lines at 4.8 or 9.6 Kbps. V.32 adjusts transmission speeds automatically based on line quality or line bandwidth. V.32 is defined for modems operating as full duplex on a four-wire circuit, or half duplex on a two-wire circuit. V.32 is pronounced as "v-dot-thirty-two".
Important features of modems adhering to this standard are:
Modems that adhere to the V.32 standard incorporate a full-duplex echo canceler data modem that supports data rates ranging from 14.4 Kbps down to 4.8 Kbps in steps of 2.4 Kbps. The modulation methods adopted are quadrature phase-shift keying for 4.8 Kbps and QAM for the other data rates. The Trellis-coded modulations allow data rates of 7.2, 9.6, 12 and 14.4 Kbps, while non-Trellis-coded modulations support 4.8 and 9.6 Kbps. The symbol rate for every data signaling rate is approximately 2,400 symbols per second.
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