基于E1接口的时钟相位同步技术的研究

Research on Clock Phase Synchronization Technology based on E1 Interface

为了实现不同类型业务和不同颗粒大小业务的统一交换,需要对统一交换技术中设备间所用的参考时钟进行相位对齐与锁定。文章采用E1接口的帧信号来传递时钟的相位信息,并通过设备间帧信息的多次交互及现场可编程门阵列实现对帧信息的处理,从而对设备的时钟相位做出调整。仿真结果表明,设备间参考时钟的相位可以相互锁定。该方案全部采用硬件通道进行处理,不会发生相位信息丢失和误传的现象,可以高效地解决设备间的时钟相位锁定问题。

In order to realize the unified exchange of different types and sizes of business,the reference clocks used in the unified exchange technology are required to align and lock the phase of reference clocks.This article uses frame signal from the E1 interface to transmit the phase information of reference clocks.The information interaction of the frames among multiple devices and Field Programmable Gate Array（FPGA）are used to process the information,which can adjust the phase of clocks in the equipments.Simulation results show that the phase of reference clocks can be locked.This scheme is processed by hardware channel,which will not generate loss or misrepresentation of phase information,and can effectively solve the clock phase locking problem among devices.