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Round trip detection method and system for passive optical network

A passive optical network and loop detection technology, applied in the field of communication, can solve the problems of not providing a method for OLT to communicate, failing to meet the needs of fast recovery of time-sensitive services, and taking a long time, so as to shorten the time of protection switching time, protect timely delivery, and improve the effect of service quality

Active Publication Date: 2012-10-17
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned full protection mode, when the optical fiber between OLT1 and optical splitter 1 is interrupted, or a branch optical fiber under optical splitter 1 is interrupted, each active ONU detects that the downlink signal is interrupted, and then performs protection switching to switch itself The upstream service of the backup ONU is switched to the standby ONU, and the service communication is carried out between the standby ONU and OLT2. During the above protection switching process, the active ONU detects a line failure and performs protection switching. The switching process takes a long time and cannot meet the time-sensitive service interruption. Due to the need for rapid recovery, the prior art does not provide a method for the OLT to determine whether the loop between the ONU and the ONU can communicate

Method used

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  • Round trip detection method and system for passive optical network
  • Round trip detection method and system for passive optical network
  • Round trip detection method and system for passive optical network

Examples

Experimental program
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Effect test

Embodiment 1

[0045] In Fig. 2 (a), (b), OLT1 is connected with all active ONUs through optical splitter 1. OLT1 and the main ONU are based on GPON or the next-generation PON based on GPON technology to perform registration activation of ONU and transmission of service data between OLT and ONU. Such as image 3 As shown, it is a flowchart of Embodiment 1 of the present invention, such as image 3 As shown, OLT1 adopts the following steps to judge whether the ring composed of OLT1, active ONU, standby ONU and OLT2 can communicate:

[0046] Step S301, OLT1 sends ring communication Round_Trip_Correspondence message to active ONU, and this message adopts PLOAM (Physical Layer Operations, Administration and Maintenance, physical layer operation, management and maintenance) mechanism, and PLOAM is applicable to the fast and timely management between OLT and ONU Maintenance information interaction and processing. The format of the loop communication message is shown in Table 1:

[0047] Table ...

Embodiment 2

[0059] In Fig. 2 (a), (b), OLT1 is connected with all active ONUs through optical splitter 1. OLT1 and the main ONU are based on GPON or the next-generation PON based on GPON technology to perform registration activation of ONU and transmission of service data between OLT and ONU. Such as Figure 4 As shown, OLT1 adopts the following steps to judge whether the ring composed of OLT1, active ONU, standby ONU and OLT2 can communicate:

[0060] Step S401, OLT1 sends a loop communication Round_Trip_Correspondence message to the active ONU, using the PLOAM mechanism, and the format of the loop communication message is as shown in Table 1:

[0061] Table 2 Structure of the Round_Trip_Correspondence message

[0062]

[0063] As shown in Table 2, the first byte of the Round_Trip_Correspondence message is the value of the ONU-ID, indicating that the message is sent to an ONU whose ONU-ID value is ONU-ID1, or that the message is an ONU-ID value of ONU- Sent by the ONU of ID1; the c...

Embodiment 3

[0074] Such as Figure 5 As shown, it is a structural diagram of a passive optical network loop detection system, and the system includes,

[0075] The first OLT is configured to send a loop communication message to the active ONU, and after receiving the loop communication message, determine that the passive optical network is a loop network;

[0076] The active ONU is used to send the loop communication message to the standby ONU after receiving the loop communication message;

[0077] The backup ONU is used to send the loop communication message to the second OLT after receiving the loop communication message;

[0078] The second OLT is configured to forward the loop communication message to the first OLT after receiving the loop communication message sent by the backup ONU.

[0079] The first OLT is used to determine that the passive optical network is a loop network, specifically,

[0080] The first OLT is used to determine that the loop communication message is consis...

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Abstract

The invention relates to a round trip detection method. The said passive optical network employs a full protection mode ,and the said method comprises that a first OLT sends a loop correspondence message to an ONU for main use; after receiving the loop correspondence message, the ONU for main use sends the loop correspondence message to a standby ONU; after receiving the loop correspondence message sent by the standby ONU by the second OLT,the loop correspondence message is forwarded to the first OLT; and after thefirst OLT's receiving the loop correspondence message, the passive optical network is determined as a loop network. The invention also provides a loop detection method for the passive optical network. By adopting the method, the loop correspondence between the OLT and the ONU can be determined through the OLT. When main stem optical fibers or branch stem optical fibers are broken, the standby OLT notifies the ONU to perform protection inversion and the protection inversion time of the ONU can be shortened, enabling the communication message between the ONU and the OLT to be recovered quickly and improving the service quality of a PON system the correspondence between the ONU and the OLT can be recovered quickly, and the service quality of PON system is improved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and system for detecting loops in a passive optical network (Passive Optical Network, PON for short). Background technique [0002] Gigabit-Capable Passive Optical Network (GPON, Gigabit-Capable Passive Optical Network) and Ethernet Passive Optical Network (EPON, Ethernet Passive Optical Network) are two important technical branches in the PON family, similar to other PON technologies, GPON and EPON is also a passive optical access technology using a point-to-multipoint topology. [0003] Such as figure 1 Shown is the topology diagram of the PON system. PON consists of an optical line terminal (OLT, Optical Line Terminal) on the office side, an optical network unit (ONU, Optical Network Unit) on the user side, and an optical distribution network (ODN, Optical Distribution Network) Composition, usually using a point-to-multipoint network structure. ODN consists of pas...

Claims

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Application Information

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IPC IPC(8): H04Q11/00H04B10/08
CPCH04B10/077H04Q2011/0081H04Q11/0067H04B10/03
Inventor 耿丹张伟良
Owner ZTE CORP
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