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V.25

An ITU standard (1968) for automatic calling and/or answering equipment on dial-up lines. It uses parallel circuits and is similar in function to RS-366 and Bell 801 autodialers used in the U.S. The answer tone defined in V.25 is the first thing heard when calling a modem. It serves a dual function of identifying the answering equipment as being a modem and also disabling the echo suppression and echo cancellation equipment in the network so that a full-duplex modem will operate properly.



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Before/After Your Search Term
BeforeAfter
v-regV.25bis
V SeriesV.26
V.110V.26bis
V.120V.26ter
V.17V.27
V.21V.27bis
V.22V.27ter
V.22bisV.28
V.23V.29
V.24V.32

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