Method for compensating asymmetric line delay caused by OLP (Optical Line Protection) switching

A compensation method and asymmetric technology, applied in the field of communication, can solve the problem of not being able to follow the working status of OLP in time, achieve high reliability and real-time performance, and reduce difficulty

Inactive Publication Date: 2011-05-18
FENGHUO COMM SCI & TECH CO LTD
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Problems solved by technology

Therefore, in a network with OLP protection, it is impossible to flexibly compensate the delay caused by line asymmetry according to the working status of the OLP in time.

Method used

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  • Method for compensating asymmetric line delay caused by OLP (Optical Line Protection) switching
  • Method for compensating asymmetric line delay caused by OLP (Optical Line Protection) switching
  • Method for compensating asymmetric line delay caused by OLP (Optical Line Protection) switching

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] The optical line protection unit OLP completes the line protection function of the OTN network (including 1:1 protection and 1+1 protection), which is divided into 1:1 single-ended switching protection, 1:1 double-ended switching protection, and 1+1 single-ended switching protection , 1+1 double-ended switching protection. 1:1 protection means: normally, the sender sends the main service on the main channel, sends the extra service (low-level service) on the backup channel, the receiving end receives the main service from the main channel, and receives the extra service from the backup channel . When the main channel is damaged, in order to ensure the transmission of the main service, the originator will send the main service to the backup channel, and the receiver will switch to select and receive the main service from the backup chan...

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Abstract

The invention discloses a method for compensating asymmetric line delay caused by OLP (Optical Line Protection) switching, which comprises the following steps of: setting a port of designated OSC (Optical Supervisory Channel) to work in the BC (Boundary Clock) or OC (Over Clock) mode, and enabling the corresponding OLP to have the automatic compensation function on the port; setting an OLP unit to work at asymmetric delay compensation values of different receiving and transmitting lines on an OSC designated port of a site with OLP; receiving the working state of the line and transmitting to the OSC at the same site in the form of switched bytes through a back plate by the OLP unit; and analyzing the received OLP switched bytes of the opposite site by the OSC, combining with the OLP switched bytes of the site, determining the actual working state of the OSC port at the site in the line protection section, and selecting the set corresponding compensation value to compensate on the slaveend. By applying the invention, asymmetric delay caused by OLP switching can be compensated in real time, the compensation effect is unrelated to the OLP section, and the stability of time synchronization during OLP switching is ensured.

Description

technical field [0001] The invention relates to a compensation method for the asymmetric time delay of 1588 time synchronous lines in the communication field, in particular to a compensation method for the line asymmetric delay caused by OLP switching. Background technique [0002] When the optical network transmission equipment is used as the bearer network of modern mobile communication services, it needs to implement the 1588 time synchronization function, and transmit the time synchronization information to each base station to achieve high-precision time synchronization. Using OTN (Optical Transport Network, Optical Transport Network) to transmit PTP (Precision Time Synchronization Protocol, Precision Time Synchronization Protocol) synchronization information over long distances has gradually begun to be applied. There are three main ways to transmit 1588 time information in the existing OTN: (1) through the optical supervisory channel OSC (Optical Supervisory Channel);...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
Inventor 梅亮陈朝辉方琼廖原陈德华郭志霞叶波程超平
Owner FENGHUO COMM SCI & TECH CO LTD
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