一、概述在数字网中,由于各站之间的传输时延受环境条件影响而变化,各线路输入到本站的时钟相位是变化的;在交换系统中,因为一般都用本地统一定时,所以必须把输入时钟相位变换成本地时钟相位。其次,在交换节点中,为了使交换机的工作容易实现,需要把输入数字序列的帧相位变成站内统一的帧相位。这就是通常所说的“比特相位同步和帧相位同步”。帧调整器的主要作用是要完成上述同步。此外,帧调整器还可以执行包括传输线路故障监视、 I. Overview In the digital network, due to the transmission delay between stations affected by environmental conditions and changes in the input line to the station’s clock phase is changing; in the exchange system, because the general use of local uniform timing, Therefore, the input clock phase must be converted to the local clock phase. Secondly, in the switching node, in order to make the work of the switch easy to realize, it is necessary to change the frame phase of the input digital sequence into a uniform frame phase in the station. This is what is commonly referred to as “bit phase synchronization and frame phase synchronization.” The main function of the frame adjuster is to accomplish the above synchronization. In addition, the frame adjuster can also perform functions including transmission line fault monitoring,