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V.25
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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.
(communications, standard)V.25 - A standard allowing an auto-answer modem to determine the correct modulation standard to use.


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For mini-circuit breakers, Technyl C 52G1 and Technyl C 52 G1 V25 are glass-filled nylon 6 grades that pass the glow-wire 960 C flammability index test at 0.
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