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一、概述为了提高长途自动拨号线路的使用率,减轻总机接线员的工作量,我们设计了用于步进制自动交换机和纵横制自动交换机的“数字式长途自动拨号扩大用户电路”,集成电路和分立元件混合使用。本电路具有以下特点: (1)使用方便安装本电路时,无需对自动交换机做大的更动,只从其中引出几条接线即可。 (2)通用性强
I. Overview In order to improve the utilization rate of long-distance automatic dial-up lines and reduce the workload of switchboard operators, we designed “Digital Long-distance Automatic Dial-up Expansion Subscriber Circuit” for step-by-step automatic switch and crossbar automatic switch, Mixed use of discrete components. The circuit has the following characteristics: (1) easy to use When installing this circuit, do not need to change the automatic switch bigger, only leads to a few wires from it. (2) versatility