| 单词 | V.92 |
| 释义 | V.92 The ITU-T Recommendation that improved on the V.90 standard in several ways.The QuickConnect feature reduces the handshaking time by approximately 50 percent, to about 10–15 seconds. QuickConnect trains the modem on the first call and remembers the characteristics of the circuit. Assuming that the circuit is the same on the next call the circuit characteristics do not have to be relearned, which results in faster connect times.V.92 increased the upstream transmission speed from 33.6 kbps to 48 kbps under optimum conditions, using a variation of PCM that allows the upstream datastream to use the same clocking source as the downstream datastream.V.90 also replaces the V.42bis compression algorithm with V.44, a string-coding algorithm that offers compression in the range of 6:1, improving throughput by 20–60 percent, and as much as 200 percent for certain kinds of highly compressible data.That yields theoretical downstream throughput rates as high as 300 kbps, compared with the maximum rates of 150–200 kbps possible with V.90 modems. A V.92 modem can put a data session on hold when it detects a voice call, either incoming or outgoing, through a call waiting indication, and gracefully resume that session when the voice call is terminated, thereby allowing a single analog line to be used for both voice and data applications. See also circuit, compression, downstream, handshaking, modem, PCM, session, throughput, upstream, V.42, and V.90. |
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