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前言 电话中继网路是英国邮政局电信网络的一个重要部分,它为本地电话交换局的所有电话业务服务(见图1)。这些话务的大部分是由直达线路或者经过中继转换交换进行传输的,其余的一
Preface The Telephone Relay Network is an important part of the UK post office telecommunications network that serves all telephone services of the local exchange (see Figure 1). Most of these traffic is transmitted by the direct line or through the relay switching exchange, the other one