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PON system and OLT

A topology diagram and link interruption technology, applied in transmission systems, digital transmission systems, electromagnetic wave transmission systems, etc., can solve the problem that the optical fiber cable of the optical splitter does not have direct detection of faults, etc.

Inactive Publication Date: 2015-09-02
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In addition, in the PON system, there is still the following problem: the fiber optic cable itself including the optical splitter does not have the function of directly detecting faults, and it is impossible to directly detect where a fault occurs on the extended optical fiber

Method used

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  • PON system and OLT
  • PON system and OLT
  • PON system and OLT

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] figure 1 It is a block diagram showing the transmission path structure of the PON system of the present invention, and shows the branching structure of the optical fiber cables 5a to 5j from one of the PON ports of the OLT1 to the ONUs 2a to 2e.

[0028] Such as figure 1 As shown, the PON system includes an OLT1 and, for example, a plurality of ONU2a-2e installed in a user's home. In addition, a PON-IF card 3 is provided in the OLT 1, and an optical fiber cable 5a is connected to one of the PON ports. Moreover, OLT1 and ONU2a-2e are connected via some optical splitter 4a-4e and optical fiber cables 5a-5j.

[0029] figure 1 In the example shown, the optical fiber cable 5a connected to the PON-IF card 3 is branched into k paths at the optical splitter 4a, wherein the optical fiber cable 5b with the optical fiber number 1 is connected with the optical splitter 4b, and the optical fiber cable 5c with the optical fiber number k is connected with the optical splitter 4b. ...

Embodiment approach 2

[0053] In Embodiment 1, when the link of the ONU 2 is interrupted, which optical fiber cable 5 has a failure (main line failure, branch line failure) can be notified to the outside. However, when the ONU2 itself fails and the status of the failure in the ONU2 cannot be reported, it is impossible to distinguish whether the link interruption of the ONU2 is caused by the failure of the optical fiber cable 5 or the failure of the ONU2. Therefore, in Embodiment 2, the determination method of how to determine whether it is caused by the failure of the optical fiber cable 5 or the failure of the ONU 2 in the case of the above-mentioned state was shown.

[0054] Figure 6 It is a block diagram showing the configuration of OLT 1 ​​according to Embodiment 2 of the present invention. Figure 6 In the OLT1 according to Embodiment 2 shown, for image 3 In the OLT 1 ​​according to Embodiment 1 shown, a multi-link interruption determination unit 17 and a same-main-line lower-level determin...

Embodiment approach 3

[0067] In Embodiments 1 and 2, when it is judged that a link interruption occurs in the ONU 2 due to a failure in the optical fiber cable 5, it cannot be recognized that the failure is caused by a disconnection of the optical fiber cable 5 or the like, or is caused by an optical splitter. 4 caused by a malfunction. Therefore, Embodiment 3 shows how to determine whether the failure is caused by the failure of the optical fiber cable 5 or the failure of the optical splitter 4 .

[0068] Figure 9 is a block diagram showing the transmission path configuration of the PON system to which Embodiment 3 of the present invention is applied, Figure 10 It is a block diagram showing the configuration of OLT 1 ​​according to Embodiment 3 of the present invention. Should Figure 9 In the PON system involved in the shown embodiment 3, in figure 1 Light emitting sections 41 a to 41 e are added to the spectroscopes 4 a to 4 e of the PON system according to the first embodiment shown. In ...

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PUM

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Abstract

An OLT includes a topology map holder that holds a topology map of a PON system, a link interruption detector that detects a link interruption of an ONU, a warning collector that collects warnings from an ONU, a filter that extracts a warning resulting from an ONU from the warnings collected by the warning collector, a fault part estimator that, when a link interruption of an ONU is detected by the link interruption detector and there is no warning which is extracted by the filter, estimates in which of optical fiber cables a fault has occurred on the basis of the topology map held by the topology map holder, and a fault part notifier that notifies information showing the fault part estimated by the fault part estimator to outside the OLT.

Description

technical field [0001] The present invention relates to a PON system and an OLT. In the PON (Passive Optical Network: Passive Optical Network) system, an optical fiber cable that is faulty when a link of an ONU (Optical Network Unit: Optical Network Unit) is interrupted is estimated, And notify the outside (OpS: Operation System: operating system) in the form of an alarm. Background technique [0002] Due to the popularity of optical broadband services, the number of GE-PON (Gigabit Ethernet-Passive Optical Network (Ethernet: registered trademark): Gigabit Passive Optical Network) ONUs installed in general households has also increased. In addition, the PON system will be used more and more in the network structure of the smart grid system in the future. Therefore, maintenance of the enlarged network becomes one of the important issues. Among them, when the connection with the ONU is cut off, the user will be affected immediately and complaints from the user will be caused...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/44
CPCH04L12/2885H04B10/038H04B10/07H04B10/0771H04B10/0773H04B10/0791H04B10/0793
Inventor 小谷玄哉
Owner MITSUBISHI ELECTRIC CORP