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(一) 模拟用户模块的组成:图1示出模拟用户模块的组成方框图。由图可见,模拟用户模块由终端控制单元(TCE)和模拟用户终端(ASM)两部分组成。关于终端控制单元中的终端接口和带存储器的B处理机,已有专文讲过,这里不再重复。模拟用户终端包括用户电路、振铃电路和成对模块支援电路。用户电路分成两组,每组30门,因此一个模拟用户终端可容纳60个用户。此60个用户以通常接入模拟交换局的同样方式接入模拟用户终端的用户电路,并在此用户电路中完成Borscht功能。由图1可见,每组用户电路都以一条PCM链路(码率4Mb/s,32时隙,每时隙16b)连至振铃电路。振
(A) the composition of analog user modules: Figure 1 shows a block diagram of the analog user module. Can be seen from the figure, analog user module by the terminal control unit (TCE) and analog user terminal (ASM) is composed of two parts. As for the terminal interface in the terminal control unit and the B processor with memory, it has been mentioned in the article that it will not be repeated herein. Analog user terminals include subscriber circuits, ringing circuits, and paired module support circuits. Subscriber circuits are divided into two groups of 30 gates each, so an analogue user terminal can accommodate 60 subscribers. The 60 users access the user circuit of the analogue user terminal in the same way that they normally access the analogue exchange and complete the Borscht function in this user circuit. As can be seen from Figure 1, each user circuit is connected to the ringing circuit by a PCM link (code rate 4Mb / s, 32 slots, 16b per slot). Vibration