Clock synchronization method and equipment in multi-signal multiplexing processing procedure

Abstract

This invention provides clock synchronous method and device in multiplex signal process, which checks the external and internal clock in multiplex signal process, determining the needed reference clock source according check result. Said invention guarantees the quality of reference clock source selected by multiplex signal process part and can select clock source according the priority of internal and external clock source of multiplex signal part avoiding clock looping to raise multiplex signal and whole network communication function.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a clock synchronization method and device in the process of multi-signal multiplexing processing. Background technique [0002] In the WDM transmission system, the bandwidth granularity of the transmission signal is relatively large, but the services actually carried are basically low-speed service signals, including low-speed SONET (Synchronous Optical Network) / SDH (Synchronous Digital Hierarchy) signals, GE (Gigabit Bit Ethernet) signal, ATM (Asynchronous Digital Serial) signal and other branch signals. In order to improve wavelength utilization, multiple service signals are often multiplexed on one wavelength for transmission in practical applications, so a service aggregation unit appears. The main function of the service convergence unit is to converge the low-speed service signals of multiple branches into one wavelength, and transmit the signals via the wave...

AI Technical Summary

Problems solved by technology

When the clock looping phenomenon occurs, it will cause poor anti-interference performance of the clock circuit, resulting in a decrease in clock performance

When using the existing technology to configure the reference clock source of the service convergence unit in the clock management unit, it is necessary to carefully consider and confirm the reference clock source selected by the modules of other service convergence units that have data interaction with the service convergence unit, so as to avoid the problem of clock looping , the configuration process is complex

[0013] To sum up, using the clock synchronization method of multi-service signal multiplexing in the prior art, each module in the service convergence unit uses the same clock as the reference clock source. For the modules in the service convergence unit that require different precision reference clocks, it cannot Meet the needs of its clock precision

Moreover, if the quality of the current clock source clock signal deteriorates, since there is no clock quality detection process, each module in the service convergence unit still uses the clock as a reference clock, which will degrade the multi-service signal multiplexing performance of the service convergence unit, and even degrade the entire communication Network Synchronization Performance

Images