英语翻译Out-of-band signaling is signaling that does not take pl

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 links are used to carry all the necessary signaling messages between nodes.Thus,when a call is placed,the dialed digits,trunk selected,and other pertinent information are sent between switches using their signaling links,rather than the trunks which will ultimately carry the conversation.Today,signaling links carry information at a rate of 56 or 64 kbps.It is interesting to note that while SS7 is used only for signaling between network elements,the ISDN D channel extends the concept of out-of-band signaling to the interface between the subscriber and the switch ©.With ISDN service,signaling that must be conveyed between the user station and the local switch is carried on a separate digital channel called the D channel.The voice or data that comprise the call is carried on one or more B channels.
同志 不要在google中翻译一下放到这里 那样我也会 我要的是更准确的翻译 麻烦各位大哥大姐了。

不发生道路和交谈一样的界外信号传输发信号.我们习惯于认为信号作为同带信号传输.我们在同一个对听见音调调节器,番号盘数位,并且听见敲响的同一种渠道导线.当电话完成时,我们谈为信号使用的同一个道路.用于的传统电话工作这样.信号设定一个电话在一个开关和另之间总发生了最终将运载电话的同一根树干.信号采取了一系列的多频的(MF)口气的形式,很象按键式拨号在开关之间.界外信号传输建立一条分开的数字通道为信令信息交换.这种渠道称信号链接.信号链接用于传播所有必要的信号信息在结之间.因此,当打时电话,番号盘数位、树干选择的和其他有关信息被送在开关使用他们的信号链接,而不是最后将运载交谈的树干之间.今天,发信号链接传播信息以56或64千位/秒的率.注意到是有趣的,当SS7为发信号仅使用在网络要素之间时,ISDN D渠道对订户和开关©之间的接口扩大界外信号传输的概念.与必须表达在用户驻地和本地开关之间的ISDN服务,发信号继续称D渠道的一条分开的数字通道.包括电话的声音或数据继续一个或更多B渠道.
不是谷歌翻译的