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一、引言集中器是介于交换机和用户之间的一种设备。它的功能是:将交换机较多线路上的话务量集中到少数线路上,传送并分散给远离交换机的用户;同样,把远离交换机的用户的话务量,集中到同样的少数线路上传送并分散给交换机用户。于是,少数的线路可以为较多的用户使用,提高了线路的利用率,减少了用户的经济负担。集中器的类型较多,仅按通过集中器的接续网络的信号的形式,可以分为模拟和数字两种。即通过接续网络的信号有两种形式,一种是连续的模拟信号,一种是间断的数字信号。
I. INTRODUCTION A concentrator is a type of device between a switch and a user. Its function is to concentrate the traffic of more lines of the switch on a few lines and transmit and distribute it to the users far away from the switch. Similarly, the traffic of the users far away from the switch is concentrated on the same few lines And dispersed to the switch user. Therefore, a few lines can be used by more users, which improves the utilization of the lines and reduces the economic burden on users. There are many types of concentrators, which can be classified into two types of analog and digital, only in the form of signals passing through the network of concentrators. That is, there are two forms of signals through the connecting network, one is a continuous analog signal and the other is a discontinuous digital signal.