A protection switching system and method

Abstract

The invention discloses a protection switched system and method, and relates to the field of network technology. The system comprises two end sites, wherein the two end sites are connected with each other through master and slave communication paths; at least one intermediate site exists on each communication path; both the two end sites and the intermediate site include optical amplifier (OA) units and optical supervisory channel (OSC) units; the two end sites also include Optical Multiplex Section Protect (OMSP) units; the OSC units are used for generating fault alarm information in the caseof a communication path failure, and transmitting the fault alarm information to the OMSP units of the two end sites; and the OMSP units are used for receiving the fault alarm information, deciding whether to execute a protection switched action or not, and transmitting an execution result to an opposite end site. Through adoption of the protection switched system and method, two-way simultaneousswitching of optical switches of the two OMSP units on a master communication path or a slave communication path can be ensured; time delay of services of the two end sites due to asymmetric of receiving and transmission paths is avoided; and the network service quality is ensured.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a protection switching system and method. Background technique [0002] OMSP (Optical Multiplex Section Protect, Optical Multiplex Section Protection) is an optical layer protection method commonly used in OTN (Optical Transport Network, Optical Transport Network) and WDM (Wavelength Division Multiplexing, wavelength division multiplexing) networks. The commonly used protection switching method is that after the service light of the 1550nm window is output by the multiplexer, it passes through the optical coupler 1+1 concurrently at the transmitting end, and selects the main or standby light at the receiving end according to the size of the received 1550nm window optical power and switching rules. output to the splitter. The main and standby optical multiplexing sections are respectively composed of several optical amplification stations, and the numbers are not n...

AI Technical Summary

Problems solved by technology

In this way, the business of the remote end will be transmitted on the main path, and the business of the local end will be transmitted on the backup path. When the length of the active and standby multiplex sections is greatly different, a large asymmetric delay will be caused, which will be sensitive to the delay difference. business impact

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