Method for detecting clock out-of-lock of line interface disk of SDH device

Abstract

The invention relates to a method for detecting the clock out-of-lock of a line interface disk of an SDH device, which comprises the following steps: 1, establishing a data channel for monitoring between a clock disk and a line interface disk, sending a prearranged data frame by the clock disk to the line interface disk in the channel based on the frame alignment signal of the device, and including a prearranged fixed byte X which is in synchrony with the clock signal of the device in the data; and 2, receiving and continuously monitoring the fixed byte X based on the own in-disk clock signaland in-disk frame alignment signal, and outputting the out-of-lock alarm to report to a web master if the fixed byte X received by the line interface disk is different from the prearranged fixed byteX. The method can report the out-of-lock alarm in time after a clock out-of-lock failure occurs to the line interface disk of the SDH device, thereby playing an important role in locating service failure and recovering in time, and providing a reference for processing the clock signal out-of-lock of devices in other fields.

Description

technical field [0001] The invention relates to the technical field of synchronous digital transmission (SDH), in particular to a method for detecting an out-of-lock clock of an SDH equipment line interface disk. Background technique [0002] Existing SDH equipment usually includes add-drop multiplexing (ADM) equipment, terminal multiplexing (TM) equipment, and digital cross-connect (DXC) equipment. , clock disk and other machine disks. The clock disk is used as the device clock source, providing a unified device clock signal and device frame signal to all interface boards, clock disks and other machine disks in the device, and there is a fixed frequency multiplier between the device clock signal and the device frame signal and phase relationship. [0003] In order to ensure the normal operation of the entire SDH equipment, it is usually required that the internal clocks of all interface boards track the device clock signal and device framing signal output by the clock boa...

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