论文部分内容阅读
PDH(准同步)数字光电传输设备是用于程控交换局间的传输设备,通过光电传输完成程控交换机间的通信。成都双流机场程控交换电话系统与机场外的通信就是通过PDH(准同步)数字光电端机来完成的。笔者
PDH (quasi-synchronization) digital optical transmission equipment is used for transmission between program-controlled exchanges, through the photoelectric transmission to complete the exchange between program-controlled switches. Chengdu Shuangliu Airport program-controlled switching telephone system and the airport outside the communication is through PDH (quasi-synchronous) digital optical terminal to complete. author