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Method for acquiring wavelength values by remote equipment in wavelength division multiplex-Ethernet passive optical network (WDM-EPON) passive optical network system

A WDM-EPON, passive optical network technology, applied in the field of wavelength acquisition by remote devices, which can solve the problems of wavelength optical signals failing to pass, unable to find ONUs, and ONU registration failures.

Inactive Publication Date: 2010-09-08
FENGHUO COMM SCI & TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the WDM-EPON hybrid passive optical network system, since there is an AAWG used for multi-wavelength multiplexing and demultiplexing in the optical distribution network ODN, when the wavelength value of the upstream optical signal sent by the ONU is the same as that of the ONU connected When the wavelength value allowed by the port on the AAWG does not match, the optical signal of this wavelength will not pass through, so the OLT will not be able to receive the upstream optical signal sent by the ONU, so that the OLT cannot find the ONU, and eventually the ONU registration will fail.

Method used

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  • Method for acquiring wavelength values by remote equipment in wavelength division multiplex-Ethernet passive optical network (WDM-EPON) passive optical network system
  • Method for acquiring wavelength values by remote equipment in wavelength division multiplex-Ethernet passive optical network (WDM-EPON) passive optical network system
  • Method for acquiring wavelength values by remote equipment in wavelength division multiplex-Ethernet passive optical network (WDM-EPON) passive optical network system

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] In the EPON system, complete the ONU registration process (that is, the process of a newly connected or offline ONU accessing the EPON network) such as figure 2 Shown:

[0034]1) First, this process is initiated by the OLT. In order to enable the OLT to have the opportunity to detect newly connected or offline ONUs, the OLT periodically generates a legal discovery time window on the downlink broadcast channel, and sends it to all ONUs in a timely manner. Discovery GATE message frame (Discovery GATE message), found that the structure of the GATE message frame is as follows image 3 As shown; find that the GATE message frame includes a time tag, authorization start time, and authorization length, and the ONU determines the time and length information of the discovery window according to the above parameters; it is a known technology to discover the tim...

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Abstract

The invention relates to the field of optical fiber communication, in particular to a method for acquiring wavelength values by remote equipment in a wavelength division multiplex-Ethernet passive optical network (WDM-EPON) passive optical network system. The key points of the method comprise that: the wavelength values of an optical network unit (ONU) uplink sending signal are filled in 31 byte filling domains between the 'synchronous time' field and the 'frame check sequence' field in a discovery message frame in IEEE802.3ah; and ONU transmits the message to an optical line terminal (OLT) according to the wavelength values of the ONU uplink sending signal filled in 31 byte filling domains. The method can correctly allocate the wavelength values of the uplink sending signal to the ONU which is not discovered by the OLT in the WDM-EPON mixed passive optical network system, so that the ONU can be registered successfully.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a method for acquiring wavelength values ​​of remote equipment in a WDM-EPON passive optical network system. The so-called WDM-EPON refers to the wavelength division multiplexing Ethernet passive optical network (a hybrid passive optical network), and the said remote device refers to the ONU (Optical Network Unit). Background technique [0002] EPON (Ethernet Passive Optical Network) technology is standardized by the IEEE 802.3EFM working group. In June 2004, the IEEE 802.3EFM working group released the EPON standard - IEEE 802.3ah (incorporated into the IEEE 802.3-2005 standard in 2005). In this standard, Ethernet and PON (passive optical network) technology are combined, and a new physical layer (mainly optical interface) applied to EPON system is defined on the basis of passive optical network architecture. Standardized and expanded Ethernet data link layer protoco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04B10/12H04B10/25
Inventor 曹桦易熳
Owner FENGHUO COMM SCI & TECH CO LTD
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