Protection switching method and device in Ethernet passive optical network

Abstract

The invention discloses a protection switching method in an Ethernet passive optical network, which comprises the following steps of: synchronizing in real time configuration data between an active port and a standby port of an optical line terminal (OLT); and performing dynamic bandwidth allocation on logical link identifiers (LLID) in the active and standby ports, performing normal dynamic bandwidth allocation on online LLIDs and performing the dynamic bandwidth allocation on offline LLIDs according to a set period by using the OLT. The invention simultaneously discloses a protection switching device in the Ethernet passive optical network, which comprises a synchronization unit used for realizing the real-time synchronization of the configuration data between the active and standby ports of the OLT, and a dynamic bandwidth allocation unit used for performing the dynamic bandwidth allocation on the LLIDs in the active and standby ports, performing the normal dynamic bandwidth allocation on the online LLIDs and performing the dynamic bandwidth allocation on the offline LLIDs according to the set period. The method and the device have the advantages of maximally reducing influenceto data transmission in the EPON and improving the quality of communication services of the EPON.

Description

technical field [0001] The invention relates to protection switching technology of redundant ports, in particular to a protection switching method and device in an Ethernet Passive Optical Network (EPON, Ethernet Passive Optical Network). Background technique [0002] The Ethernet passive optical network system is a single-fiber bidirectional optical access network using a point-to-multipoint structure. It consists of an optical line terminal (OLT, Optical Line Terminal) at the central office, an optical network unit (ONU, Optical Line Terminal) Network Unit) and Optical Distribution Network (ODN, Optical Distribution Network). figure 1 It is a schematic diagram of the composition structure of the Ethernet passive optical network, such as figure 1 As shown, because the typical topology of the EPON system is a tree, there is a hidden danger of a single point of failure. If the backbone optical fiber fails, it will cause all the connected ONUs to have faulty communication at...

AI Technical Summary

Problems solved by technology

At present, the implementation methods of all-fiber protection are relatively complicated, and this increase in complexity also brings about a decrease in protection switching performance.

[0004] Generally speaking, the commonly used implementation methods will cause the ONU to re-register after the protection switching occurs, and this takes a long time in the service recovery stage after the switching, because this part has a discovery cycle of at least 50ms plus about With a window size of 200us (the worst case for a single ONU), plus the time for upper-layer protocol processing and registration, it is difficult to guarantee service recovery within 50ms after switching, which will result in failure to meet the requirements of carrier-grade equipment. The data packet loss rate will be more serious

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