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Passive optical network and protection switching method thereof

A passive optical network and protection switching technology, which is applied in the communication field, can solve the problems of complex process, slow recovery speed, poor applicability, etc., and achieve the effect of simplifying the switching process and reducing the switching time

Inactive Publication Date: 2011-05-25
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a passive optical network (Passive Optical Network, referred to as PON) and its protection switching method, which are used to solve the problems of slow recovery, complicated process and poor applicability in the protection switching of the prior art The problem

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  • Passive optical network and protection switching method thereof
  • Passive optical network and protection switching method thereof
  • Passive optical network and protection switching method thereof

Examples

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example 1

[0044] Such as figure 2 As shown, in the topology structure of the passive optical network in the way of protecting the backbone optical fiber, the path from the first optical line terminal OLT1 to the ONU through the optical splitter is the main path, and the second optical line terminal OLT2 reaches the ONU through the optical splitter The path is an alternate path. The main channel is used as the service channel of the optical network unit and the optical line terminal. For the communication between the network unit and the optical line terminal, after the ONU detects the downlink optical signal of OLT2, the ONU and the OLT use signaling interaction to complete the update of the ONU’s equalization delay (EqD) value, such as image 3 shown.

[0045] If the ONU detects signal loss or frame loss (LOS or LOF), or detects the downlink optical signal of OLT2 after enabling the backup path, it automatically adjusts the value of its own EqD, and increases the equalization time d...

Embodiment 2

[0055] Such as Figure 4 As shown, the protection switching method in the passive optical network of the present invention includes the following steps:

[0056] Step 401: All ONUs automatically adjust the value of their EqD, and the value of EqD after the ONU update is equal to the value EqD1 before the ONU update plus a delay constant D (D>0, preferably D≥250us);

[0057] Step 402: OLT2 continues to allocate uplink bandwidth to each ONU according to the method in the prior art;

[0058] Step 403: ONU sends uplink data according to the updated equalization delay EqD1+D within the uplink bandwidth allocated to itself by OLT2, so as to realize uplink data synchronization;

[0059] Step 404: After receiving the upstream frame sent by the ONU, OLT2 calculates the equalization delay adjustment value ΔEqD that the ONU needs to adjust according to the following method, and sends the ΔEqD to all ONUs;

[0060] Wherein: ΔEqD=the actual arrival time of the ONU uplink frame−the expect...

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Abstract

The invention relates to the technical field of communication and discloses a passive optical network and a protection switching method thereof. In the invention, when an optical network unit (ONU) detects the loss of downlink signals, the loss of downlink frames, or the generation of main / standby protection switching, the balance delay value stored by the ONU is increased; additionally, after the balance delay value of the ONU is increased, the ONU sends uplink data in the uplink bandwidth allocated by an optical line terminal (OLT); after receiving the uplink data sent by the ONU, the OLT calculates the balance delay adjustment value of the ONU and sends the balance delay adjustment value to all the ONUs; and the ONUs respectively correct the current balance delay values according to the balance delay adjustment value. By using the invention, the communication between the OLT and the ONUs after the protection switching can be quickly established, thereby simplifying the switching process of the ONUs under the protection mode and shortening the switching time.

Description

technical field [0001] The present invention relates to the communication field, in particular to a passive optical network (Passive Optical Network, PON for short) and a protection switching method thereof. Background technique [0002] Gigabit-Capable Passive Optical Network (GPON) technology is an important technical branch of the passive optical network (PON) family, similar to other PON technologies, GPON is also a point-to-multipoint Topological passive optical access technology. The topology of GPON system is as follows: figure 1 As shown, the GPON system consists of an optical line terminal (Optical Line Terminal, OLT for short), an optical network unit (Optical Network Unit, ONU for short) at the user side, and an optical distribution network (Optical Distribution Network, ODN for short). , usually using a point-to-multipoint network structure. The optical distribution network ODN is composed of passive optical devices such as single-mode optical fibers, optical ...

Claims

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Application Information

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IPC IPC(8): H04B10/00H04B10/08H04J3/06H04B10/032H04B10/272
CPCH04B10/272H04Q2011/0081H04Q11/0067H04B10/032
Inventor 张伟良耿丹
Owner ZTE CORP
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