Line asymmetry compensation method, device and system

Abstract

Disclosed are a method, device, and system for line asymmetry compensation. The method comprises: by establishing an outer ring synchronization session and an inner ring synchronization session, slave clock devices acquiring transmission timestamps thereof and same of a master clock device on a first path and a second path in an outer ring and an inner ring, where the first path and the second path constitute a ring network path; the slave clock devices determining, on the basis of the timestamps acquired, a transmission delay between selves and the master clock device on the first path and the second path, and transmitting to a network management device the transmission delay calculated; when the network management device is activating a standby link, on the basis of the path of the standby link, using the transmission delay on a corresponding path to determine an asymmetry compensation value of the standby link relative to an original primary link, and notifying the corresponding slave clock devices to perform a line compensation on the basis of the asymmetry compensation value. Employment of the present invention allows for implementation of automatic compensation for line asymmetry of same-cable optical fiber ring networks.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a line asymmetry compensation method, device and system. Background technique [0002] The IEEE1588 protocol defines a precision time protocol (Precision Time Protocol, PTP) used in distributed measurement and control systems. PTP achieves master-slave synchronization by calculating clock offsets through message passing between master and slave devices. The master clock periodically multicasts messages containing time stamps. The slave clock that needs to be synchronized sends messages to the master clock. The slave clock calculates the time offset and transmission delay. The above synchronous messaging mechanism is a delay-request response mechanism, such as figure 1 shown. [0003] see figure 1 , the master clock periodically sends a Sync (synchronization) message that includes clock information, and then sends a Follow_Up message to notify the actual sendin...

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Problems solved by technology

[0037] For the instrument measurement method, a synchronous instrument is required to cooperate with the work, and automatic compensation cannot be realized, and the cost of the instrument is very high, and the workload of the project opening is very large

[0038] For the clock comparison method, in order for a node to obtain synchronous compensation information, it is necessary to recover both the clock of the symmetric path and the clock of the asymmetric path on the same node, and then perform comparison. relatively high

[0039] It can be seen that there is currently no simple and easy implementation plan for optical fiber line asymmetry compensation

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