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Method and device for measuring distance in passive optical network

A passive optical network and serial number technology, applied in the field of communication, can solve the problems of interrupting ONU normal business, long opening time, affecting efficiency, etc., and achieve the effect of simple and convenient implementation method and shortening opening time

Active Publication Date: 2015-05-20
ZTE CORP
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  • Abstract
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  • Claims
  • 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] Such as 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 se...

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Abstract

The present invention discloses a method for ranging in a passive optical network, and the method includes: obtaining a Round Trip Delay (RTD) between an Optical Line Terminal (OLT) and an Optical Network Unit (ONU); and opening a quiet window used for the ranging for the ONU according to the RTD to perform the ranging on this ONU. The present invention further discloses an apparatus for ranging in a passive optical network, and the apparatus includes: an obtainment module which is configured to: obtain a RTD between an OLT and an ONU; and a ranging module configured to: open a quiet window used for ranging for the ONU to perform ranging on the ONU according to the RTD. The present invention shortens the open time of the quiet window used for the ranging and improves the efficiency of the upstream transmission, and the implementation method is simple and convenient.

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 (OpticalLine 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). Usually, point-to-multipoint 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 betwee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q11/00H04B10/07
CPCH04J3/0682H04J3/14H04Q11/0067H04Q2011/0079
Inventor 张伟良耿丹
Owner ZTE CORP
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