ITU-T Q 27-1988 TRANSMISSION OF THE ANSWER SIGNAL《概述》.pdf

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1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 1 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU%.%2!,G0G02%#/-%.$!4)/.3G0G0/.G0G04%,%0(/.%37)4#().G0G0!.$G0G03).!,).).4%2.!4)/.!,G0G0!54/-!4)#G0G0!.$3%-)G13!54/-!4)#G0G07/2+).42!.3-)33)/.G0G0/ andb) splitting of the speech path, where in-band signalling i

2、s used.It is therefore desirable to minimize the delays and the duration of the interruption of the speech path.Minimization of the latter can be achieved by:- short send line splitting;- short duration of the signal; and- fast termination of the sending and receiving splits on cessation of the signal.