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Method and system for quickly updating ranging result of optical network unit through optical line terminal

An optical line terminal and optical network unit technology, applied in the field of communications, can solve problems such as excessive message volume, inability to reflect the protection effect of protection switching, and inability to effectively implement protection switching, so as to simplify the message sending process, realize protection switching, The effect of saving message volume

Inactive Publication Date: 2011-03-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since each message takes 125us, when the number of ONUs supported by the OLT reaches 128, only by sending the Ranging_time message, the time to notify each ONU of the equalized delay signal is 125×3×128us=48ms, plus Before sending these Ranging_time messages in the O4 state, the time for the OLT to perform ranging between the standby OLT and the ONU basically cannot meet the requirements of 50ms service switching
Therefore, it will cause service terminals, and the protection effect of the actual active-standby OLT protection switching cannot be reflected
To sum up, in the backbone optical fiber protection mode, using the above-mentioned existing method, since the OLT needs to send the equalized delay signal corresponding to the ONU for each ONU, it can only be sent in a one-to-one communication method, resulting in The amount of messages is too large, so it is basically unable to meet the requirements of 50ms service switching in terms of time, and it is actually impossible to effectively realize protection switching

Method used

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  • Method and system for quickly updating ranging result of optical network unit through optical line terminal
  • Method and system for quickly updating ranging result of optical network unit through optical line terminal
  • Method and system for quickly updating ranging result of optical network unit through optical line terminal

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0071] Example 1: The ONU is in the ranging state after the protection switching is triggered. In this example, the quick update of the ONU ranging result specifically includes the following steps:

[0072] Step 201, when the ONU is in the O4 state, that is, the ranging state, wait for the standby OLT to send a corresponding equalization delay signal.

[0073] Step 202, the backup OLT obtains the RTD related to the length difference of the main optical fiber of the main channel and the backup channel according to the existing technology Δ .

[0074] Step 203, the OLT sends the modified Ranging_time message three times to all the ONUs in the form of a broadcast message. Among them, the Ranging_time message contains RTD Δ .

[0075] Step 204, ONU according to the RTD carried in the received Ranging_time message Δ , and the equalized delay signal corresponding to the main channel originally used by the ONU, using Eqd 备用 =Eqd 主用 +RTD Δ Calculate the equalized delay signal ...

example 2

[0079] Example 2: When the ONU is in normal working state, and the protection switching has not been triggered yet, the broadcast RTD is adopted Δ The management information base is updated in an updated way, so that the updated equalization delay signal is directly used when the protection switching is started. In this example, the quick update of the ONU ranging result specifically includes the following steps:

[0080] Step 301, when the ONU is in the 05 state, that is, the normal working state, the backup OLT obtains the RTD related to the length difference of the main optical fiber of the main path and the backup path according to the existing technology Δ .

[0081] Step 302, the OLT sends the modified Ranging_time message three times to all ONUs in the form of a broadcast message. Among them, the Ranging_time message contains RTD Δ .

[0082] Step 303, ONU according to the RTD carried in the received Ranging_time message Δ , and the equalized delay signal correspon...

example 3

[0084] Example 3: When the ONU is in a normal working state and the protection switching has not yet been triggered, the management information base is updated by using the unicast EqD update method, so that the updated equalization delay signal is directly used when the protection switching is started. In this example, the quick update of the ONU ranging result specifically includes the following steps:

[0085] Step 401, when the ONU is in the 05 state, that is, the normal working state, the backup OLT obtains the RTD related to the length difference of the main fiber of the main path and the backup path according to the existing technology Δ .

[0086] In step 402, the OLT calculates the equalized delay signal of each ONU corresponding to the backup channel, and sends three modified Ranging_time messages to each corresponding ONU in the form of a unicast message. Wherein, the Ranging_time message includes the equalized delay signal corresponding to each ONU calculated by t...

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Abstract

The invention discloses a method for quickly updating a ranging result of an optical network unit through an optical line terminal. The method comprises the following steps that: the optical line terminal (OLT) transmits the acquired ranging difference to all optical network units (ONU); and the current ONU quickly updates the ranging result thereof according to the acquired ranging difference. The invention also discloses a system for quickly updating the ranging result of the optical network unit through the optical line terminal. In the system, a transmitting unit is used for transmitting the acquired ranging difference to all ONUs through the OLT; and an updating unit is used for quickly updating the ranging result of the current ONU according to the acquired ranging difference through the current ONU. The method and the system save the information quantity, and can realize quick switching in a protected state so as to effectively realize protected reversing.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method for quickly updating the distance measurement results of an Optical Network Unit (ONU) by an Optical Line Terminal (OLT, Optical Line Terminal) in a protected state in a Passive Optical Network (PON, Passive Optical Network) system methods and systems. Background technique [0002] With the development of broadband access technology, operators are gradually accepting and deploying an optical access network (OAN, Optical Access Network) to provide users with faster speed and higher quality services. PON is a point-to-multipoint fiber access technology. Such as figure 1 As shown, the PON is composed of an OLT, an ONU, and an optical distribution network (ODN, Optical Distribution Network) where an optical splitter is located, and one OLT is connected to multiple ONUs through the ODN at the same time. Among them, the ONU can be various forms of terminals, including:...

Claims

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Application Information

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IPC IPC(8): H04Q11/00H04B10/08
CPCH04J3/0682H04Q11/0067H04Q2011/0079H04J3/14
Inventor 张德智张伟良袁立权
Owner ZTE CORP
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