Subscriber line interface circuit is an important part of digital program-controlled switching system.
模拟用户线接口电路是数字程控交换系统的重要组成部分。
Stay ILD card processing after drying test and found do veneer ILD card switching power supply circuit, drive the trigger line work normally work normally.
待ILD卡处理的烘干后做单板测试，发现ILD卡开关电源线路工作正常，驱动触发线路也工作正常。
For the use of off-line switching mode power supply IC, an internal power supply circuit combining with a high voltage startup current source is proposed.
结合高压启动恒流源设计了一种用于离线式开关电源的内部电源电路。
Crossbar switching was carried out by a special circuit called a maker which provided common control of number entry and line selection for all calls.
纵横制交换由一个称为标志器的特定电路控制，标志器提供整个号码的公共控制并选择所有呼叫的路由。
Two or two-circuit transmission line power supply should be able to automatic switching, self-generating equipment should be installed automatically activated.
两个电源或两回线路应能自动切换，自备发电设备应有自动启动装置。
Two or two-circuit transmission line power supply should be able to automatic switching, self-generating equipment should be installed automatically activated.
两个电源或两回线路应能自动切换，自备发电设备应有自动启动装置。
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