, 9.6 kbit/s, 12 kbit/s and 14.4 kbit/s. In V.17, quadrature amplitude modulation (QAM) is specified in which bit groups of 16, 32, 64, and 128 bits can be used. The carrier signal is in the middle of the frequency range for trunk speech at 1.8 kHz. V.17 operates synchronously and in half-duplex and uses Time Compressing Multiplexing (TCM) and a speed capaasization with Automatic Fallback.
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