本文所讨论的设计方法已成功地应用于国产程控数字电话交换机。
The design methods given here have been successfully implemented in a Chinese-developed SPC digital telephone switching system.
这个百分比通过连接到数字电话交换机的主线数除以主线总数得到。
This percentage is obtained by dividing the number of main lines connected to digital telephone exchanges by the total number of main lines.
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.
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.
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