程控电话交换机（stored program control telephone switching system）简称：PBX，是计算机按预先编制的程序控制接续的自动电话交换机，全称存储程序控制电话交换机。程控电话交换机由硬件和软件组成：硬件包括话路部分、控制部分和输入输出部分。软件包括程序部分和数据部分。
... 复印机Copy Machine 程控电话交换机Digital Telephone Switch Board 微型计算机及外设Micro-computer and Attachment ...
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PCS----program control switches 程控电话交换机 IDD----international direct dialing 国际长途直拨 ..
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数字式程控电话交换机 digital program-controlled switching ap-paratus
电话程控交换机工程师 PBX Field Engineer
程控数字电话交换机 SPCDTSSstored program colled digital telephone switching system
程序控制电话交换机 Program controlled telephones switching system
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程控电话交换机过电流保护元件要求用低电阻率高性能的PTC陶瓷材料来制备。
PTC element as over-current limiter for program-controlled telephone exchanger is one of the important application of PTC ceramic material.
程控电话交换机过电流保护元件要求用低电阻率高性能的PT C陶瓷材料来制备。
High performance PTC ceramic material with low resistivity is desired to prepare an over-current limiter for program-controlled telephone exchanger.
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