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p/t jian rong an jian dian hua ji fa hao dian lu yuan li
Author(s): 
Pages: 36-37
Year: Issue:  3
Journal: Family Electronics

Keyword:  极性保护电路发号电路发号集成电路按键电话机程控交换机双音频信号叉簧开关呼叫信号双音频电话组成框图;
Abstract: <正> 脉冲/双音频兼容电话机简称P/T话机。由于它可以发送脉冲或双音频两种信号,对机电式自动交换机和程控交换机都适用,因此被广泛使用。P/T话机组成框图如图1所示,其叉簧开关、极性保护电路及电子铃等与脉冲或双音频电话基本无差别。所不同的是,P/T话机使用的发号集成电路可发送两种制式的呼叫信号。另外,由于送、受话专用集成
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