英语翻译Out-of-bandsignalingissignalingthatdoesnottakeplaceoverthesamepathastheconversation.Weareusedtothinkingofsignalingasbeingin-band.Weheardialtone,dialdigits,andhearringingoverthesamechannelonthesamepair

Question

英语翻译
Out-of-band signaling is signaling that does not take place over the same path as the conversation.We are used to thinking of signaling as being in-band.We hear dial tone,dial digits,and hear ringing over the same channel on the same pair of wires.When the call completes,we talk over the same path that was used for the signaling.Traditional telephony used to work in this way as well.The signals to set up a call between one switch and another always took place over the same trunk that would eventually carry the call.Signaling took the form of a series of multifrequency (MF) tones,much like touch tone dialing between switches.Out-of-band signaling establishes a separate digital channel for the exchange of signaling information.This channel is called a signaling link.Signaling
2011-8-18 20:50:23

Answer 1

这篇够长,说实话5分够少的.而且这篇文章不是老外写的吧,不少的错误.带外信令是通话时并不出现在同样路径下的信令.我们以前认为信令总是带内的.我们听到拨号音,拨号按键声,听到在同一对电话线的同一个通道上的振铃音.当呼叫结束时,我们使用刚刚用于信令的路径来进行交谈.传统电话过去就是这么工作的.信令在交换机间建立呼叫并且总是用在同一条传输语音的话路来传输.信令以一系列多频音的方式存在,很像交换机间的触摸音拨号.
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