Method and device for measuring distance in passive optical network

A technology of passive optical network and optical line terminal, applied in the field of distance measurement in passive optical network, can solve the problems of affecting efficiency, long opening time, interrupting normal business of ONU, etc., and achieves convenient and simple implementation method, The effect of shortening the opening time

Active Publication Date: 2011-05-25
ZTE CORP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Since the OLT does not know the position of the ONU to be ranged, the OLT opens a quiet window for the ONU to be ranged according to the distance of the nearest ONU supported by itself and the distance of the farthest ONU. If the time is too long, the normal business of the ONU in the running state is interrupted, which affects the efficiency of upstream transmission

Method used

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  • Method and device for measuring distance in passive optical network
  • Method and device for measuring distance in passive optical network
  • Method and device for measuring distance in passive optical network

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Embodiment Construction

[0055] The technical solutions provided by the embodiments of the present invention will be further introduced below in conjunction with the accompanying drawings.

[0056] like figure 2 As shown, in the passive optical network, the process of OLT ranging the ONU in the registration activation state is as follows:

[0057] Step 201, the OLT obtains the loop delay of the loop between the OLT and the ONU;

[0058] In this step, the loop delay is obtained by sending a sequence number request from the OLT, but not limited thereto. For all messages and / or Bandwidth allocation is also applicable and will not be repeated here.

[0059] Wherein the method for obtaining the loop time delay by sending a serial number request by the OLT, such as image 3 As shown, specifically steps 2011-2014 are included:

[0060] Step 2011, when the ONU is in the serial number state, the OLT sends a serial number request to the ONU in the serial number, and records the sending time T1 of the seria...

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Abstract

The invention provides a method and a device for measuring distance in a passive optical network, and relates to the field of communication. The method comprises the following steps of: acquiring route time delay (RTD) between an optical line terminal (OLT) and an optical network unit (ONU); and opening a quite window for measuring distance for the ONU according to the RTD to measure the distance for the ONU.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for measuring distance in a passive optical network. Background technique [0002] Gigabit-Capable Passive Optical Network (GPON) is an important technical branch of the passive optical network (PON) family. Similar to other PON technologies, GPON is also a point-to-multipoint topology Passive optical access technology. [0003] The topology of GPON system is as follows: figure 1 As shown, GPON is composed of an optical line terminal (Optical Line Terminal, OLT) on the office side, an optical network unit (Optical Network Unit, ONU) on the user side, and an optical distribution network (Optical Distribution Network, ODN). point network structure. ODN is composed of passive optical components such as single-mode optical fibers, optical splitters, and optical connectors, and provides optical transmission media for the physical connection between OLT and ONU. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04B10/12
CPCH04Q2011/0079H04Q11/0067H04J3/0682H04J3/14
Inventor 张伟良耿丹
Owner ZTE CORP
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