Method for realizing distributed protection and passive optical network (PON) system

Abstract

The invention provides a method for realizing distributed protection and a passive optical network (PON) system. The method comprises a step that: after detecting damage of a master interface or interruption of a service born on the master interface, a line card of an optical line terminal carries out protection switching to switch the communication service born on the master interface to a slave interface. According to the distributed protection method provided by the invention, a protection function of the PON is transferred to the line card from a main control switch board, and the line card performs detection alarming, operates a protection algorithm and carries out protection switching operation, so that the problem of single-point failure caused by using the unique main control switch board to realize PON protection in a centralized protection method is solved, a bottleneck for protection switching time in a centralized protection mode can be eliminated, recovery time for service protection is shortened, the service protection capacity of the optical line terminal is improved, and the requirement of an operator is further met.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a method for realizing distributed protection in a passive optical network (Passive Optical Networks, PON for short) and a passive optical network system. Background technique [0002] The passive optical network includes an Ethernet passive optical network (Ethemet PON, EPON for short), a gigabit PON (GPON for short), a next generation optical passive network (Next Generation PON, NG-PON), and the like. The passive optical network adopts a point-to-multipoint optical fiber access technology, which consists of the optical line terminal (Optical Line Terminal, OLT for short), the optical network unit (Optical Network Unit, ONU for short) on the user side, and the connection between the OLT and the ONU. Optical Distribution Network (ODN for short) composition. The protection mechanism of the passive optical network is mainly used to enhance the reliability of the opt...

AI Technical Summary

Problems solved by technology

There are defects in this method. First, in the centralized protection mode, the protection functions are all implemented on the main control switch board, and OLT equipment usually has only one working main control switch board. If there is only one main control switch board An abnormality of the board will lead to complete failure of the PON protection function; secondly, the service interruption time (protection switching service recovery time) required by the current operator due to PON protection switching is very short, and the traditional centralized protection mode line card needs to be When an inter-board message is sent, the alarm is reported to the main control switch board, so there is a scheduling delay for the main control switch board to report the alarm message on the line card. With the increasing capacity of optical line terminal equipment, the number of line cards in the equipment is increasing. , the inter-board messages received by the main control switch board from different line cards will also increase, so when the communication between the OLT working interface and the ONU interface is interrupted, and the moment protection switching occurs, the main control switch board will communicate with the line card The increase in the scheduling time of the reported alarm message will lead to an increase in the recovery time of the protection switching service, so the centralized protection method will have an inevitable time bottleneck, which does not meet the operator's requirements for the recovery time of the PON protection switching service

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