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无论是三级制的移动通信网还是四级制移动通信网,在与公众通信网相连接时,均需要解决设备接口与信号配合的问题。这关系到两个网能否互通。一、关于不同交换制式的设备接口交换机之间能否可靠地配合工作,将会影响到整个通信网的服务质量。这种配合工作的内容包括程控局的终端接口、信号方式和同步三个方面。这里只谈谈终端接口问题。程控交换机的终端接口为数字型,其主要功能有:码型交换、帧同步、局间中继信号的插入和提取、告警及故障指示等。如果是模拟型终端接口,其主要功能有:模/数和数/模变换、多路复用、局间中继信号的插入和提取以及2/4线变换等。
Whether it is a three-level mobile communication network or a four-level mobile communication network, it is necessary to solve the problem that the interface of the device and the signal cooperate when connected with the public communication network. This is related to the two networks can interoperate. First, on the different switching system equipment Interface switches can work reliably with one another, will affect the entire communication network service quality. This cooperation with the contents of the program including the Bureau of the terminal interface, signaling and synchronization of three aspects. Here only to talk about the terminal interface problem. The program-controlled switch terminal interface for the digital type, its main functions are: pattern exchange, frame synchronization, inter-office relay signal insertion and extraction, alarm and fault indication. If it is an analog terminal interface, its main functions are: A / D and D / A conversion, multiplexing, inter-office relay signal insertion and extraction and 2/4 line conversion.