准同步字复接的特性探讨

The Exploration on the Property of PDH Multiplexing by Byte

准同步按位复接可以通过调整位 V1是传信码还是填充码来调整基群参加复接的速率 ,以保证 84 48kb/ s的二次群速率。但是 ,一旦出现假失步 ,则接收端首先要重新搜索同步 ,而后还要再对各基群实施同步 ,这样会丢失很多信息 ,而且也不利于转接点的重新复接。为了解决上述复接的弊端 ,本文提出了准同步字复接的方案 ,此方案使信道中信息的传输仍以路为单位 ,更适合于对高次群直接进行信息的交换和复接 ,同时 。

PDH multiplex by bit can adiust the transmitting code and filling code of VI bit to guarantee the second rate of 8 848 Kb/s,But the bogus out of synchrony appears.It will lose many messages and will disadvantage the remultiplex of connecting node,for the receiver firstly researches synchronously,and then makes the basic rate synchronous.To solve the abuse of multiple by bit,this article brings forward the project of PDH multiple.In this project,the message is transmitted by route.It will better fit the switching and multiplexing of message in high rate.And at the same time,it brings much more convenience for synchronousness of both sides.