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1. 发明授权

US4069402A Remote-testing arrangement for PCM transmission system 失效
标题翻译： PCM传输系统的远程测试装置
公开(公告)号：US4069402A
公开(公告)日：1978-01-17
申请号：US709445
申请日：1976-07-28
申请人： Pietro Mantovani , Silvio Roldi
发明人： Pietro Mantovani , Silvio Roldi
IPC分类号： H04B17/40 , H04B3/46
CPC分类号： H04B17/406
摘要： Two sets of line terminals in a pair of PCM head stations are interconnected by a set of transmission channels via a number of cascaded relay stations each including a line repeater for each channel. A service link extends from an address generator in one head station to a monitoring unit in each relay station, the monitoring unit including a regenerating circuit for throughgoing address codes and further including a discriminating network which, upon detecting an address code identifying that relay station, sends a sinusoidal priming signal to all the associated repeaters. A predetermined PCM test code, e.g. one containing a certain number of consecutive zeroes, is simultaneously transmitted from the same head station over the channel containing a selected repeater to be checked which, upon coincidence of the test code with the priming signal from the associated monitoring unit, closes a loop for feeding back the test code to the originating line terminal.
摘要翻译：一对PCM头站中的两组线路终端通过一组传输信道经由多个级联的中继站互连，每个中继站包括每个信道的线路中继器。服务链路从一个头站中的地址生成器延伸到每个中继站中的监视单元，监视单元包括用于通过地址码的再生电路，并且进一步包括鉴别网络，其在检测到识别该中继站的地址码时，向所有相关联的中继器发送正弦启动信号。预定的PCM测试码，例如。一个包含一定数量的连续零点的信号同时从同一头站通过包含所选择的中继器的信道同时发送，以检查哪个测试代码与来自相关联的监控单元的启动信号一致时，闭合用于馈送的循环将测试代码返回到始发线终端。

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