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Balance delay presetting method in Gbit passive optical fiber network

A technology of passive optical fiber network and balanced delay, which is applied in the transmission system, electromagnetic wave transmission system, electrical components, etc., and can solve the problems such as ONU influence

Inactive Publication Date: 2009-04-01
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the existing G.984.3 standard, the preset equalization delay is realized through broadcast messages. When most ONUs work stably, it is necessary to change the equalization delay of a specific ONU. When the broadcast equalization delay preset method is adopted , it will affect the normal operation of the ONU

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  • Balance delay presetting method in Gbit passive optical fiber network
  • Balance delay presetting method in Gbit passive optical fiber network
  • Balance delay presetting method in Gbit passive optical fiber network

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Embodiment Construction

[0017] In the present invention, by improving the Upstream_Overhead message, the GPON system supports equalization delay preset for a specific ONU. The improved Upstream_Overhead message is mainly reflected in the first byte, which is extended from the original broadcast ONU-ID (ONU identifier) ​​to the ONU-ID supporting a specific ONU, that is, the content of the first byte before the improvement is fixed "11111111 "(broadcast ONU-ID), the content of the first byte after improvement is "ONU-ID or 11111111", as shown in Table 1, where ONU-ID refers to the ONU-ID of a specific ONU (a value other than 11111111, such as 1100110011 etc.), 11111111 refers to the broadcast ONU-ID.

[0018] The improved Upstream_Overhead message is shown in Table 1:

[0019]

[0020]

[0021] The first byte of the improved Upstream_Overhead message can support the broadcast ONU-ID or the ONU-ID of a specific ONU. When the content of the first byte is "11111111", the Upstream_Overhead message ...

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Abstract

The invention discloses a presetting method of an equalizing delay in a gigabit-capable passive optical fiber network system. The method comprises the steps as follows: an optical transmission line terminal presets the equalizing delay of an optical network unit by unicasting an Upstream_Overhead message; the Upstream_Overhead message supports the presetting of the equalizing delay of the opticalnetwork unit; the optical network unit presets the equalizing delay according to parameters in the Upstream_Overhead message; the optical transmission line terminal measures the distance for the optical network unit to obtain an exact equalizing delay, and sends the exact equalizing delay to the optical network unit; and the optical network unit adjusts an upstream frame clock. The method realizes presetting of the equalizing delay for a single ONU by improving the Upstream_Overhead message.

Description

technical field [0001] The invention relates to a broadband optical access technology, in particular to a method for equalizing delay preset in a gigabit passive optical network (GPON) system. Background technique [0002] In Gigabit Passive Optical Network (GPON, Gigabit Passive Optical Network) system, multiple optical network units (ONUs) can be connected to one optical transmission line terminal (OLT) through an optical splitter, and the distance from each ONU to the OLT is different. Similarly, in order to avoid conflicts between optical signals sent from ONUs to OLTs, each ONU should have a corresponding equalization delay, so that the distance from each ONU to the OLT appears to be the same. [0003] During the ONU activation process, the OLT first needs to preset the equalization delay of the ONU to minimize conflicts between the ONUs. After the ONU registration is successful, the OLT needs to perform accurate distance measurement on the ONU to obtain an accurate equ...

Claims

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Application Information

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IPC IPC(8): H04B10/18H04B10/08H04B10/294
Inventor 张伟良
Owner ZTE CORP