程控数字电话交换机

本文研究程控数字电话交换机中用户集中器时分接线器（LTSW）的多故障检测。

In this paper , multiple fault detection of line concentrator time switch in SPC switching system is discussed .

本文对程控数字电话交换机所用的集成电路器件，交换机的系统结构以及性能要求的发展趋势进行了讨论。

The development trends of integrated circuits used in SPC telephone switching systems , system architecture , features and requirements of the switching systems are discussed .

程控数字电话交换机诞生后，开始有了呼叫等待、呼叫转移之类新的业务功能。这些业务功能可以认为是早期的智能化业务。

After the birth of program-controlled digital telephone exchange , telephone began to have the new class of business functions , such as " call waiting " and " call transfer " . These new functions were considered to be the early intelligent business .