A CDE Definition
(V.Fast Class) An analog modem technology for 28,800 bps from Rockwell International, endorsed by many vendors before V.34 was finalized. V.FC was very similar to V.34, but V.FC modems required an upgraded chip for full compatibility. See V.34.
An ITU standard (1994) for 28,800 bps and (1996) 31,200 and 33,600 bps analog modems using QAM modulation. Before V.34, AT&T's V.32terbo and Rockwell International's V.FC modems came on the market to provide greater speed than the V.32bis 14,400 bps standard. After V.34 was standardized at 28.8 Kbps, subsequent enhancements that raised speeds to 33.6 Kbps were folded back into V.34, and there was no change in number or designation.
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