分析了影响程控用户交换机电话接通率的各种因素，并结合实际情况指出提高电话接通率的具体措施。
This paper analyses all factors that influence the telephone connection of program-controlled customer exchangers and puts forward measures for raising the telephone connection rate.
这种中继电路为程控用户交换机进入公用电话网提供了全自功入网能力，并易于进行程控用户交换机之间的组网。
This scheme provides the automatic trunking ability for PABX to enter the telephone network and connent with other PABX easily.
在对S1240 (elc型)程控交换机进行日常维护时，常见故障有用户模块、中继模块和计费模块的故障。
The common faults of S1240 (ELC type) SPC exchange are in user mod ul e, relay module and metering module in daily maintenance work.
介绍一种新型的程控交换机用户线测试系统。
A new kind of subscriber line testing system for SPC exchanges is introduced.
本文分析了程控数字用户交换机过压过流产生的主要原因，并讨论了过压过流的保护方法。
The paper analyzes the major reasons of overvoltage and overcurrent occuring to program-controlled digital users exchanger, and discusses the protection methods against overvoltage and overcurrent.
STA5型用户板用于数字程控交换机的用户接口，也可做为各类接入网系统的远端二线模拟接口。
STA5 subscriber line is applied to subscriber line interface of programmed control digital switches, and two wire analogy remote interface of access network.
程控交换机用户板测试仪主要是针对中兴通讯ZXJ2000型程控交换机用户板而设计的。
The PBX user board trial instrument presented is designed mainly aiming at the ZXJ2000 PBX user board.
程控交换机用户板测试仪主要是针对中兴通讯ZXJ2000型程控交换机用户板而设计的。
The PBX user board trial instrument presented is designed mainly aiming at the ZXJ2000 PBX user board.
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