Method for distance measurement in gigabit passive optical network system

A technology of passive optical network and ranging method, applied in the field of communication, can solve the problems of inapplicability and no longer effective of Type B protection method, and achieve the effect of fast protection switching and guaranteeing QoS

Active Publication Date: 2010-10-27
ZTE CORP
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Problems solved by technology

This method can effectively avoid re-ranging after protection switching, but its application range is limited to the scenario where the active OLT and the standby OLT are connected to the same RE. When the active OLT and the standby OLT are connected to different REs (such as Figure 4 As shown), this method is no longer valid, and it is not applicable to the traditional Type B protection method
[0013] Therefore, for the Type B protection mode, there is currently no unified and effective method to realize the dynamic and real-time ranging of each ONU by the standby OLT

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  • Method for distance measurement in gigabit passive optical network system
  • Method for distance measurement in gigabit passive optical network system
  • Method for distance measurement in gigabit passive optical network system

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Embodiment Construction

[0040] The idea of ​​the present invention is: the active OLT sends a ranging request to the ONU, the active OLT and the standby OLT both receive the corresponding ranging response sent by the ONU; calculate the ranging result of the standby OLT to the ONU. The active OLT and the standby OLT cooperate with each other to complete the ranging of the standby OLT to the ONU.

[0041] The process of the active OLT and the standby OLT to cooperate to complete the ranging includes: the active OLT sends a ranging request to the ONU, the active OLT and the standby OLT both receive the corresponding ranging response sent by the ONU, and record the corresponding receiving time points respectively. The difference between the two receiving time points and the ranging result of the active OLT to the ONU are indirectly calculated to obtain the ranging result of the standby OLT to the ONU.

[0042] Such as Figure 5 As shown, the active OLT sends a ranging request at T1, the ONU sends a rang...

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Abstract

The invention discloses a method for distance measurement in a gigabit passive optical network (GPON) system, in particular to a method for the distance measurement of an ONU (optical network unit) on a dynamic and real-time basis by a standby OLT (optical line terminal) in order to achieve the rapid protection switch. The method comprises the following steps that: a request for distance measurement is sent to an ONU by an active OLT; the corresponding response of the distance measurement, which is sent by the ONU, is received by both the active OLT and the standby OLT; and the distance measurement result of the ONU is calculated by the standby OLT.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a ranging method of a GPON (Gigabit Passive Optical Network, Gigabit Passive Optical Network) system. Background technique [0002] A GPON system usually consists of an OLT (Optical Line Terminal, Optical Line Terminal), an ONU (Optical Network Unit, Optical Network Unit) and an ODN (Optical Distribution Network, Optical Distribution Network). The ODN is usually a point-to-multipoint structure, and an OLT is connected to multiple ONUs through the ODN. [0003] The GPON system adopts TDMA (Time Division Multiplex Access) access in the uplink direction (ONU to OLT), but due to actual project deployment, the actual fiber length between each ONU and OLT cannot be completely Similarly, the time required for the signals sent by each ONU to reach the OLT is not exactly the same, so the signals sent by multiple ONUs may collide at the OLT, which will cause the OLT to fail to receive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/08H04B10/18H04B1/74H04B10/07
Inventor 张伟良
Owner ZTE CORP
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