Method and device for realizing PON (Passive Optical Network) system service recovery

A technology of system services and implementation methods, applied in the field of communications, can solve the problems of long service switching and recovery time, etc.

Inactive Publication Date: 2010-09-08
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, in the case of type B protection switching, due to the strict ...

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  • Method and device for realizing PON (Passive Optical Network) system service recovery
  • Method and device for realizing PON (Passive Optical Network) system service recovery

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The following will take the insertion and removal of an optical fiber as an example for specific description. figure 1 It is a schematic diagram of the service restoration process after the optical fiber is restored when the optical fiber is plugged or unplugged.

[0029]Assume that 64 ONUs that are working normally are connected to the PON port. According to the G.984.3 standard, after the optical fiber is unplugged, all 64 ONUs will receive LOS, and will immediately migrate to the O6 state, start the timer, and when the timer expires, the ONU state will migrate to the O1 state; After the signal is normal, the ONU will migrate to the O2 state.

[0030] And according to the technical solution of the present invention, when the optical fiber is plugged in, the OLT immediately sends a state transition message (for example, a se...

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Abstract

The invention discloses a method and a device for realizing PON system service recovery, which can rapidly recover the services of all ONUs (Optical Network Units) which are in a normal state previously. The main technical scheme comprises the following steps that: 1. when a downlink signal from an OLT (Optical Line Terminal) to the ONUs is normal, the OLT immediately sends a state transfer message, and all the ONUs which are originally distributed with ONU IDs immediately transfer to an O4 or O5 state after receiving the message; 2. the OLT continuously measures the distances of all the ONUs which are in the normal state before service cut-off and transfer to the O4 or O5 state after receiving the message; and 3. service recovery is carried out on all ONUs which successfully update EqDl; and for ONUs which do no start the T-CONTs (Transmission Containers), the T-CONTs need to be started firstly. By adopting the technical scheme, the PON system service recovery time can reach a millisecond level.

Description

technical field [0001] The invention belongs to the technical field of communications, and in particular relates to an ONU (Passive Optical Network Unit, OpticalNetwork Unit) in a PON (Passive Optical Networks, passive optical network, including GPON, NG-PON, etc.) system. A method and device for realizing ONT (ie passive optical network terminal, Optical Network Terminal) service restoration. Background technique [0002] In a PON system, usually an optical line terminal (OLT, Optical Line Termination) connects multiple ONT / ONUs through an optical distribution network (ODN, Optical Distribution Network), usually with 1:64, 1:128 or 1:256 connections way, and each ONT / ONU is uniquely identified by a unique identifier, that is, a serial number (SN, Serial Number). The ONU needs to go through a series of state transitions, and the service can be normal only after migrating to a certain state. [0003] The state transition of ONU is specified in the G.984.3 standard. For the ...

Claims

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Application Information

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IPC IPC(8): H04J3/08H04B1/74H04B10/08H04Q11/00H04B10/032
Inventor 卢金树
Owner ZTE CORP
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