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V25

See V.25.



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.PCMV25bis
V110V26
V120V26bis
V17V26ter
V20V27
V21V27bis
V22V27ter
V22bisV28
V23V29
V24V2I

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