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一、引言复接可以提供多路信号组合的方法,以便经济地利用信道的有效传输容量。在数字传输的TDM体系中,数字复接是把若干个低速数字流,周期地排列成一个较高速率的合路数字流。数字复接分同步复接和异步复接两种,同步复接是复接相同速率的数字序列,要求待复接的各支路信源间相互同步,因而需要有个同步网;异步复接可复接若干个相互独立的异步支路信息,其方法是通过塞入脉冲进行码速调整,从而变异步为同步,然后再进行同步复接。
I. INTRODUCTION Multiplexing can provide a combination of multiple signals in order to economically utilize the effective transmission capacity of a channel. In digital transmission TDM system, digital multiplexing is the number of low-speed digital stream, periodically arranged into a higher rate of the combined digital stream. The digital multiplex is divided into synchronous and asynchronous multiplexing, and the synchronous multiplexing is a digital sequence that is multiplexed with the same rate, and the source of each branch to be multiplexed is required to be synchronized with each other. Therefore, a synchronous network is required; asynchronous multiplexing A number of mutually independent asynchronous branch information can be multiplexed. The method is to perform code rate adjustment by stuffing pulses, so that the variant steps are synchronized, and then the synchronous multiplexing is performed again.