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.

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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.

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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.

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