JP2010278620A - Optical network unit, failure site detecting device, communication path switching method and failure site detection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect a failure and failure sites of optical fibers in an optical communication network so that when the failure is detected, a communication means is switched to a radio line to ensure communication services. <P>SOLUTION: A failure detecting section 104 of an optical network unit (ONU 1) detects a failure of an optical fiber line 101, from the intensity of an optical signal received by an electricity-light/light-electricity conversion section 102. When a failure is detected in the optical fiber line 101, the failure detecting section 104 notifies the display device of the ONU 1 of the failure; and feeds power to a power supply unit of a radio module section 110 and powers to the radio module section 110. A path-switching section 108 switches the data communication path from communication that utilizes the optical fiber line to communication utilizing a radio line. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an optical line termination device that detects a failure of an optical fiber line in an optical communication network, a failure location detection device, a communication path switching method, and a failure location detection method.

In a conventional optical access network connected in the form of a passive optical network (PON), an optical line installed on the subscriber side is compared to one optical line terminal (OLT) installed on the station side. Up to 32 terminal units (ONU: Optical Network Unit) are connected.
The ONU device is a device that is installed as a terminal of an optical communication network and performs optical signal / electrical signal conversion and optical signal multiplexing and demultiplexing (see, for example, Non-Patent Document 1).
FIG. 11 is a diagram showing a functional block configuration of a conventional ONU apparatus 1000.
As illustrated in FIG. 11, the ONU apparatus 1000 includes an electrical / optical / optical / electrical conversion unit 1002, a failure detection unit 1004, and an interface conversion unit 1006.

The electrical / optical / optical / electrical converter 1002 converts the optical signal received through the optical fiber 1001 into an electrical signal and outputs the electrical signal to the interface converter 1006. The interface conversion unit 1006 converts an electrical signal into a digital signal and converts it into a digital signal conforming to a structure such as an Ethernet (registered trademark) frame. The data converted by the interface conversion unit 1006 is output to user equipment such as a router.
On the other hand, data from the user side is converted into an electrical signal by the interface conversion unit 1006, converted into an optical signal by the electrical / optical / optical / electrical conversion unit 1002, and output to the optical communication network.

  When the electrical / optical / optical / electrical converter 1002 receives an optical signal, the failure detection device 1004 performs failure detection of the optical fiber 1000 that transmits the optical signal by observing the received optical signal. There is an optical pulse test method as a method for detecting a failure point of an optical fiber line in the ONU apparatus 1000 (see Non-Patent Document 2, for example). In the optical pulse test method, a failure point is specified by inputting an optical pulse into an optical fiber and measuring a reflected wave.

Higuchi et al., “Development of ONU device for global ATM-PON system”, IEICE, General Conference B-8-4, March 7, 2000 “Search method in the event of optical fiber failure”, NTT Journal, October 1, 2006

However, when an OLT device installed on a conventional telephone office side and a plurality of subscriber-side ONU devices are connected by an optical fiber line in the PON form, an optical signal from the office is transmitted through an optical fiber by a branching device such as a splitter. If a problem occurs due to the disconnection of the optical fiber line because the line is branched, the technique described in Non-Patent Document 2 identifies the ONU device that cannot communicate due to the failure location from the OLT on the station side. There was a problem that it was difficult to do.
For example, in the OLT on the station side, if an optical signal from a certain ONU device is not detected, whether the light emission of the ONU device is suppressed, or whether the power supply is stopped by switching off the ONU device, There is a problem that it is difficult for the OLT to distinguish whether the optical fiber line connected to the ONU device is out of order.

Further, the failure location detection by the optical pulse test method has a problem that an optical signal used by another user becomes noise of the test signal.
In addition, when the optical fiber line is disconnected, the ONU device monitors the reception state of the optical signal from the OLT, and thus can detect a failure such as an optical fiber disconnection, but the optical fiber line is disconnected. In addition, there is a problem that the station side does not have a means of communicating the abnormality and cannot respond immediately.

  The present invention has been made in view of the above points, and detects a failure such as a cut of an optical fiber between the ONU device and the OLT in the optical communication network connected in the PON form, and detects the failure. If a communication path is detected, the communication path is switched from an optical fiber line to a wireless line, notification of failure information to the pole and emergency communication with the station, or subscribers can receive services from the network. The purpose is to do.

  In order to achieve the above-described object, the present invention is an optical line termination device that is installed at the end of an optical communication network and is connected to an optical fiber line that constitutes the optical communication network, and is an optical transmission line that transmits the optical fiber line. A converter that performs communication using the optical fiber line by receiving a signal and converting the optical signal into an electric signal or by converting the electric signal into an optical signal and outputting the optical signal to the optical fiber line A wireless module that converts an electrical signal into a wireless signal, or converts a wireless signal into an electrical signal and performs communication using a wireless line, and measures the optical signal to detect a failure in the optical fiber line And when the failure detection unit detects a failure of the optical fiber line, the communication using the optical fiber line is changed to the communication using the wireless line. A path switching unit for changing Ri is an optical network unit and having a.

  Further, the present invention provides the above-described invention, wherein the path switching unit, when the optical fiber line in which the failure is detected is restored to a state where communication using the optical fiber line is possible, The communication is switched from communication used to communication using the optical fiber line.

  According to the present invention, in the above-described invention, a failure of the optical fiber line is detected by the failure detection unit, and communication using the optical fiber line is changed from communication using the optical fiber line by the path switching unit. In the case of switching, a restriction processing unit is provided for restricting a predetermined communication protocol or a predetermined communication service in communication using the wireless line.

  In the invention described above, the present invention further includes an identifier storage unit that stores identification information for uniquely identifying its own device, and the wireless module unit detects failure of the optical fiber line by the failure detection unit. If detected, the identification information is read from the identifier storage unit, the identification information is converted into a radio signal, and transmitted by communication using the radio channel.

  The second invention is connected to the plurality of optical line termination devices described above, a branching device that branches the optical fiber line and connects the plurality of optical line termination devices, and the optical communication network, A failure location detection device in a communication system comprising an optical line accommodation device installed on a station side and a failure location detection device connected to the optical communication network, and stores connection relation information of the optical communication network Failure location detection, comprising: a connection relationship storage unit; identification information transmitted from the optical line termination device; and a failure location identification unit that identifies the failure location of the optical fiber line based on the connection relationship information Device.

  According to a third aspect of the present invention, there is provided a communication path switching method in an optical line terminator having a communication function using a radio line, installed at the end of an optical communication network, and connected to an optical fiber line, and detecting a failure. A step of measuring an optical signal transmitted through the optical fiber line to detect a failure of the optical fiber line, and when a failure of the optical fiber line is detected by the failure detection unit, a path switching unit includes: And a step of switching from communication using an optical fiber line to communication using the wireless line.

  According to a fourth aspect of the present invention, a plurality of optical line terminators installed at the end of an optical communication network composed of optical fiber lines and the optical fiber lines are branched to connect the plurality of optical line terminators. A failure location in a communication system comprising: a branching device; an optical line accommodation device connected to the plurality of optical line termination devices via the optical communication network and a wireless line; and a failure location detection device connected to the optical communication network. A detection method, wherein the optical line termination device measures a signal of the optical fiber line connected to the optical line termination device to detect a failure of the optical fiber line; and , When detecting a failure of the optical fiber, switching from communication using the optical fiber line to communication using the wireless line; A step of transmitting identification information for uniquely identifying the optical device to the failure location detection device via the wireless line; and an identification of the optical line termination device received by the failure location detection device. A failure location detection method comprising: a step of detecting a failure location of the optical fiber line from information and connection relationship information indicating a connection relationship of the plurality of optical line termination devices in the optical communication network. is there.

According to the present invention, the optical line terminating device on the subscriber side of the optical communication network can detect the failure of the optical fiber line and promptly notify the station side.
Further, even if the optical fiber line is broken, the subscriber can perform data communication by wireless communication.

It is a schematic functional block block diagram of the ONU apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the ONU apparatus which concerns on 1st Embodiment. It is a general | schematic functional block block diagram of the ONU apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the ONU apparatus which concerns on 2nd Embodiment. It is a general | schematic functional block block diagram of the ONU apparatus which concerns on the 3rd Embodiment of this invention. It is a flowchart which shows operation | movement of the ONU apparatus which concerns on 3rd Embodiment. It is a figure which shows an example of a structure of the optical communication network of a PON form. It is a figure which shows an example of the failure location detection method which concerns on the 4th Embodiment of this invention. It is a figure which shows an example of the failure location detection method which concerns on the 4th Embodiment of this invention. It is a figure which shows an example of the failure location detection method which concerns on the 4th Embodiment of this invention. It is a general | schematic functional block block diagram of the conventional ONU apparatus.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is a functional block configuration diagram of an ONU device 1 according to the first embodiment. The ONU device 1 is a device installed on the subscriber side, and is connected to an OLT device installed on the telephone station side by an optical fiber line 101. The ONU device 1 includes an electrical / optical / optical / electrical conversion unit 102, a failure detection unit 104, an interface conversion unit 106, a path switching unit 108, an interface conversion unit 109, and a wireless module unit 110.

The electrical / optical / optical / electrical converter 102 converts an optical signal received through the optical fiber line 101 into an electrical signal, and outputs the converted electrical signal to the interface converter 106.
The electrical / optical / optical / electrical converter 102 converts the electrical signal output from the interface converter 106 into an optical signal, and outputs the converted optical signal to the optical fiber line 101.

The interface conversion unit 106 converts the electrical signal output from the electrical / optical / optical / electrical conversion unit 102 into a digital signal conforming to a data configuration such as an Ethernet (registered trademark) frame and outputs the digital signal to the path switching unit 108. The digital signal converted by the interface conversion unit 106 is output as data to user equipment such as a router (not shown) via the path switching unit 108.
The interface conversion unit 106 converts the digital signal output from the path switching unit 108 into an electrical signal and outputs the electrical signal to the electrical / optical / optical / electrical conversion unit 102.

  The failure detection unit 104 measures an optical signal received by the electrical / optical / optical / electrical conversion unit 102 and detects failure of the optical fiber line 101. The failure detection performed by the failure detection unit 104 is generally performed by a known method (see, for example, “search method when optical fiber fails”, NTT Journal, October 1, 2006). Further, when the failure detection unit 104 detects a failure in the optical fiber line 101, the failure detection unit 104 instructs the path switching unit 108 to change the data path.

  When the failure detection unit 104 detects a failure in the optical fiber line 101, the path switching unit 108 selects wireless communication by the wireless module unit 110 via the interface conversion unit 109, and the failure detection unit 104 detects the failure of the optical fiber line 101. When no failure is detected, optical communication by the electrical / optical / optical / electrical conversion unit 102 is selected via the interface conversion unit 106. That is, the path switching unit 108 changes the data path and the communication means in accordance with the instruction from the failure detection unit 104. Thereby, the ONU apparatus 1 can switch from data communication using the optical fiber line 101 to data communication using a wireless line when a failure occurs in the optical fiber line 101.

  In addition, the failure detection unit 104 supplies power to the wireless module unit 110. The interface conversion unit 109 converts a digital signal such as data input via the failure detection unit 104 or the path switching unit 108 into an electrical signal and outputs the electrical signal to the wireless module unit 110. The wireless module unit 110 implements data communication with a station side or the like using a wireless line.

  Here, a wireless communication system using a wireless line is, for example, a mobile phone (W-CDMA (Wideband Code Division Multiple Access), EV-DO (Evolution-Data Optimized)), or a wireless LAN (IEEE802.11a / b /). g), WiMAX (Worldwide Interoperability for Microwave Access), Wide Area Ubiquitous Communication System, PHS, FWA (Fixed Wireless Access), or a system that communicates via radio waves. As the communication method, the wireless module unit 110 uses circuit switching communication or packet switching communication such as i-mode.

FIG. 2 is a flowchart showing a flow of communication path switching processing when a failure is detected in the optical fiber line 101 of the ONU device 1 in this embodiment.
When the electrical / optical / optical / electrical conversion unit 102 of the ONU apparatus 1 receives an optical signal from the optical fiber line 101 (step S202), the failure detection unit 104 determines the optical fiber line 101 based on the intensity of the received optical signal. The failure detection process (cutting, distortion, bending, etc.) is performed (step S204). For example, the failure detection unit 104 detects a failure by comparing the intensity threshold value determined in advance and stored with the intensity of the received optical signal.

  The failure detection unit 104 determines whether there is a failure in the optical fiber line 101 (step S206). If it is determined that there is no failure (“No” in step S206), the electrical / optical / optical / electrical conversion unit 102 The received optical signal is converted into an electric signal (step S208) and output to the interface conversion unit 106. The interface converter 106 converts the electrical signal into a digital signal (step S210), and outputs the data to user equipment (not shown) (step S212).

The failure detection unit 104 determines whether there is a failure in the optical fiber line 101 (step S206). If it is determined that there is a failure (“Yes” in step S206), the failure detection unit 104 displays the ONU device 1 (not shown). A failure notification is displayed by displaying an error message or the like on the display device or lighting the lamp (step S214).
The failure detection unit 104 supplies power to the wireless module unit 110 and turns on the wireless module unit 110 (step S216). The path switching unit 108 switches the data communication path from communication using the optical fiber line 101 to communication using a wireless line (step S218).

As described above, the ONU device 1 can notify the station side in real time of a signal indicating that the optical fiber line 101 is out of order by communication using a wireless line.
In the present embodiment, the power supply to the wireless module unit 110 is started when a failure of the optical fiber line 101 is detected. However, the wireless module unit 110 is always supplied with power, and the process of step S214 is performed. Thereafter, the process of step S218 may be performed.

  In addition, when the failed optical fiber line 101 is repaired and communication using the optical fiber line 101 is restored, the failure detecting unit 104 detects that the optical fiber line 101 has no failure, that is, the optical fiber line. When it is detected that the communication apparatus 101 is communicable, a signal indicating that optical communication is selected may be output to the path switching unit 108. As a result, the path switching unit 108 switches from communication using radio to communication using the optical fiber line 101. When the electrical / optical / optical / electrical converter 102 receives the optical signal, the electrical / optical / optical / electrical converter 102 converts the optical signal into an electrical signal and outputs the electrical signal to the interface converter 106, and also passes through the path switching unit 108 and the interface converter 106. The input electrical signal is converted into an optical signal and output to the optical fiber line 101. As a result, the ONU device 1 can resume optical communication using the optical fiber line 101.

  Further, in the ONU device 1, when communication using the optical fiber line 101 is restored, a signal indicating that is transmitted from the outside to the wireless module unit 110 by a wireless signal, and the path switching unit 108 is transmitted via the interface conversion unit 109. The path switching unit 108 may switch the communication path.

  As described above, according to the present embodiment, in the ONU apparatus 1, the failure detection unit 104 detects a failure in the optical fiber line 101, notifies the station side immediately, and notifies the station side of the failure in the optical fiber line 101. The installed OLT device can be notified. Further, the ONU device 1 can transmit and receive data by wireless communication via the wireless module unit 110 even if the optical fiber line 101 connected to the own device is broken.

<Second Embodiment>
Next, a second embodiment will be described.
FIG. 3 is a functional block configuration diagram of the ONU device 11 according to the second embodiment.
The ONU device 11 includes an electrical / optical / optical / electrical conversion unit 102, a failure detection unit 104, an interface conversion unit 106, a path switching unit 108, an interface conversion unit 109, and a wireless module unit 310, and includes an identifier storage unit 312. . In the identifier storage unit 312, identification information for uniquely identifying the ONU device 11 is stored in advance.

  The electrical / optical / optical / electrical conversion unit 102, the failure detection unit 104, the interface conversion unit 106, the path switching unit 108, and the interface conversion unit 109 are the same as the respective units of the ONU device 1 of the first embodiment shown in FIG. Since it has a function and performs the same operation, the same reference numerals are given and description thereof is omitted. The ONU device 11 includes a wireless module unit 310 instead of the wireless module unit 110. In addition to the operation of the wireless module unit 110, the wireless module unit 310 reads identification information from the identifier storage unit 312 when the power is turned on, and transmits the read identification information to the station side (communication service provider or the like) by wireless communication. .

FIG. 4 is a flowchart showing the flow of the communication path switching process when a failure of the optical fiber of the ONU device 11 in this embodiment is detected.
The processing from step S402 to step S412 is the same as the processing from step S202 to step S212 shown in FIG.
The failure detection unit 104 determines whether there is a failure in the optical fiber line 101 (step S406). If it is determined that there is a failure (“Yes” in step S406), the failure detection unit 104 displays the ONU device 11 not shown. A failure notification is displayed by displaying an error message or the like on the display device or lighting the lamp (step S414).

The failure detection unit 104 supplies power to the wireless module unit 310 and turns on the wireless module unit 310 (step S416). The wireless module unit 310 reads the identification information from the identifier storage unit 312 and transmits it to the station side (step S418).
As a notification method to the communication carrier, communication may be performed by connecting to a special telephone number or the like prepared by the communication carrier, or a URL prepared by the communication carrier may be accessed, or communication may be performed. Data (identification information, etc.) may be transmitted to an IP address prepared by the operator.
The path switching unit 108 switches the data communication path from communication using the optical fiber line 101 to communication using a wireless line (step S420), and continues the communication.

In this way, the ONU device 11 identifies the signal indicating that the optical fiber line 101 connected to the ONU device 11 has failed, that is, the optical communication cannot be performed due to the failure of the optical fiber line 101, and the identification of the own device. Information can be notified to the station side (communication service provider side) in real time by the wireless module unit 310. For example, by specifying the ONU device 11 that can no longer perform optical communication on the station side, it is possible to easily identify the optical fiber line in which the failure has occurred.
Note that the wireless module unit 310 may stop communication after notifying the communication carrier of the identification information of the ONU device 11.

<Third Embodiment>
Next, a third embodiment will be described.
FIG. 5 is a functional block configuration diagram of the ONU device 21 in the third embodiment.
The ONU device 21 includes an electrical / optical / optical / electrical conversion unit 102, a failure detection unit 104, an interface conversion unit 106, a path switching unit 108, an interface conversion unit 109, a wireless module unit 110, and a protocol service regulation processing unit 512. The The ONU device 21 is different from the ONU device 1 in the first embodiment shown in FIG. 1 only in that a protocol service restriction processing unit 512 is provided. 104, 106, 108, 109, 110), and their description is omitted.

  The protocol service restriction processing unit 512 is provided between the path switching unit 108 and the interface conversion unit 109, and controls communication protocols and communication services that can be used by a user through data communication using a wireless line, that is, filtering processing for data. Do. Specifically, the protocol service restriction processing unit 512 discards data corresponding to a predetermined communication protocol or communication service from the data input from the path switching unit 108 without outputting it to the interface conversion unit 109, Other data is output to the interface conversion unit 109. The protocol service restriction processing unit 512 discards data corresponding to a predetermined communication protocol or communication service from the data input from the interface conversion unit 109 without outputting it to the path switching unit 108, Data is output to the path switching unit 108.

FIG. 6 is a flowchart showing the flow of the communication path switching process at the time of detecting an optical fiber failure of the ONU device 21 in the present embodiment.
The processing from step S602 to step S612 is the same as the processing from step S202 to step S212 of the first embodiment shown in FIG.

The failure detection unit 104 determines whether or not there is a failure in the optical fiber line 101 (step S606). If it is determined that there is a failure (“Yes” in step S606), the failure detection unit 104 displays the ONU device 21 (not shown). A failure notification is displayed by displaying an error message or the like on the display device or lighting the lamp (step S614).
The failure detection unit 104 supplies power to the wireless module unit 110 and turns on the wireless module unit 110 (step S616).
The protocol service restriction processing unit 512 sets a communication protocol that can be used in communication using a wireless line, a communication service, or both (step S618).
The path switching unit 108 switches the data communication path from communication using the optical fiber line 101 to communication using a wireless line (step S620).

In this embodiment, examples of communication protocols to be controlled include TCP (Transmission Control Protocol), UDP (User Datagram Protocol), SIP (Session Initiation Protocol), sendmail, SMTP (Simple Mail Transfer Protocol), FTP (File Transfer Protocol). ), HTTP (HyperText Transfer Protocol), HTTPS (Hypertext Transfer Protocol Security), and SSH (Secure Shell).
In addition, there are e-mail, videophone, telephone, file download, chat, IP telephone and the like as regulated communication services.
In addition, in the telephone service, it is possible to restrict only the incoming call service or only the special number such as “110”, “119”, and “113”. If it is a communication service, it may be defined as a target of regulation.
The communication protocols and communication services subject to these restrictions (filtering) are determined in advance and stored in the protocol service restriction processing unit 512 of the ONU device 21. Alternatively, a storage unit is provided in the ONU device 21 and a table defining communication protocols and communication services to be regulated is stored in the storage unit. When the table is switched to a wireless line, the protocol service regulation processing unit 512 The filtering process may be performed by reading the table.

In this way, by restricting communication protocols and communication services that can be used in communication using a wireless line, the communication processing speed can be ensured by performing only specific data communication. Further, by limiting the communication protocols and communication services that can be used on the wireless line, it is possible to ensure security by performing access control. In addition, by setting priorities for the communication protocols or communication services that are subject to regulation, data with high urgency can be preferentially transmitted.
Note that, similarly to the ONU device 11 (FIG. 3) of the second embodiment, the identifier for identifying itself may be stored in the ONU device 21 of the present embodiment, and the identifier may be transmitted to the station side by wireless communication.

<Fourth Embodiment>
Next, a fourth embodiment will be described.
FIG. 7 is a diagram showing a network configuration of the PON mode in the present embodiment.
As shown in FIG. 7, on the station (communication carrier) side, an OLT device (optical line terminating device) 51, a failure location detecting device 53, and a wireless line terminating device 55 are connected to the core network 60 and installed.

The failure location detection device 53 detects a failure location in the PON type optical communication network from identification information (identifier, ID, etc.) transmitted from the ONU device. The failure location detection device 53 includes a connection relationship storage unit 531 that stores connection relationship information indicating connection relationships (network topology) of ONU devices in the optical communication network, and identification information and connection relationship storage units that are received from the ONU device. Based on the connection relation information stored in 531, an optical fiber line in which a failure has occurred in the optical network is specified and output.
The wireless line termination device 55 connects the wireless line 70 and the core network 60, and sends the identification information transmitted from the ONU devices # 1 to # 32 via the wireless line 70 to the failure detection device via the core network 60. Send. In this embodiment, the case where the ONU device 11 of the second embodiment is used as the ONU device will be described.

  In the PON type optical communication network shown in FIG. 7, a branching device C5 is connected to an OLT device (optical line accommodating device) 51 installed on the station side, and branching devices C1, C2, C3, C4 are connected to the branching device C5. Connected. Each branching device C1, C2, C3, and C4 is connected with a maximum of eight optical network unit (ONU: Optical Network Unit) installed on the subscriber side. Therefore, a maximum of 32 ONU devices (# 1 to # 32) are connected to the OLT device 51. Here, for example, a fiber type optical coupler, a waveguide type optical coupler, or the like is used for the branching devices C1 to C5.

  As shown in FIG. 7, each of the ONU devices # 1 to # 8 is connected to the branching device C1 via optical fiber lines f1 to f8. Each of the ONU devices # 9 to # 16 is connected to the branch device C2 via optical fiber lines f9 to f16. Each of the ONU devices # 17 to # 24 is connected to the branching device C3 via optical fiber lines f17 to f24. Each of the ONU devices # 25 to # 32 is connected to the branching device C4 via optical fiber lines f25 to f32.

The branch device C5 and the branch device C1 are connected by an optical fiber line f33. The branch device C5 and the branch device C2 are connected by an optical fiber line f34. The branch device C5 and the branch device C3 are connected by an optical fiber line f35. The branch device C5 and the branch device C4 are connected by an optical fiber line f36. The branch device C5 and the OLT 51 are connected by an optical fiber line f37.
As described above, the ONU devices # 1 to # 32, the branching devices C1 to C5, the optical fiber lines f1 to f37, and the OLT device 51 constitute an optical communication network.

Normally, data communication using the optical fiber lines f1 to f37 is performed between the OLT 51 and the ONU apparatuses # 1 to # 32 unless a failure occurs in the optical fiber lines f1 to f33.
The failure location detection device 53 stores connection relationship information indicating the connection relationship (network topology) in the above-described optical communication network of the OLT 51, branching devices C1 to C5, and ONU devices # 1 to # 32.

Below, some examples of failure location identification in the optical fiber lines f1 to f37 between the OLT 51 and the ONU devices # 1 to # 32 by the failure location detection device 53 will be described and described.
8-10 is a figure for demonstrating an example of a failure location identification process.
In the optical communication network shown in FIG. 8, a cut point P1 exists in the optical fiber line f17. At this time, the ONU device # 17 detects a failure in the optical fiber line f17 in accordance with the processing shown in FIG. 4, and uses its identification information (ID) and information indicating that the failure has been detected as a radio signal, as a failure location detection device. 53. The failure location detection device 53 receives the identification information transmitted from the ONU device # 17 via the wireless line 70, the wireless line termination device 55, and the core network 60.
In the failure detection device 53, when receiving the identification information of the ONU device and the information indicating the failure detected by the ONU device from the ONU device # 17, the failure location specifying unit 532 receives the identification information of the ONU device # 17. From the connection relation information stored in the connection relation storage unit 531, it is detected that a failure location such as disconnection exists in the optical fiber line f17.

  In the optical communication network shown in FIG. 9, there is a cut point P2 in the optical fiber line f17 and a cut point P3 in the optical fiber line f24. At this time, each of the ONU device # 17 and the ONU device # 24 detects a failure of the optical fiber line connected to the own device according to the processing shown in FIG. 4 and supplies its own identification information (ID) to the wireless module unit 310. Is transmitted to the fault location detecting device 53. In the failure detection device 53, the failure location specifying unit 532 sends information indicating that the identification information and the name have been detected from the ONU device # 17 and the ONU device # 24 to the wireless line 70, the wireless line termination device 55, and the core network 60. , It is detected from the identification information of the ONU devices # 17 and # 24 and the connection relation information stored in the connection relation storage unit 531 that there is a failure location such as disconnection in the optical fiber lines f17 and f24. To do.

In the optical communication network shown in FIG. 10, a cut point P4 exists in the optical fiber line f35. At this time, in each of the ONU devices # 17 to # 24, according to the processing shown in FIG. 4, the failure detection unit 104 detects a failure in the optical fiber line connected to itself, and the wireless module unit 310 detects its own identification information. (ID) is transmitted to the failure detection device 53.
In the failure detection device 53, the failure location specifying unit 532 displays the identification information of the device from the ONU device # 17 to the ONU device # 24 and information indicating that the failure has been detected as the wireless device 70, the wireless line termination device 55, the core. When received via the network 60, it is confirmed that there is a failure point such as disconnection in the optical fiber line f35 from the identification information of the ONU devices # 17 to # 24 and the connection relation information stored in the connection relation storage unit 531. To detect.

  As described above, the failure location identifying unit 532 of the failure location detection device 53 identifies the failure location of the optical fiber line in the optical communication network according to the identification information from the ONU device and the information indicating that the failure has been detected. Can do.

The failure location specifying unit 532 includes a table in which a combination of identification information of a failed ONU device and a failure location of an optical fiber line in an optical communication network are provided in advance, and the failure location is detected using the table. May be performed.
Moreover, although the failure location detection apparatus 53 showed the structure connected with the OLT apparatus 51, it is good also as a structure connected via the core network 60. FIG. Moreover, although the failure location detection apparatus 53 demonstrated as an independent apparatus, it is set as the structure contained in the OLT apparatus 51, and the OLT apparatus 51 may detect a failure.

DESCRIPTION OF SYMBOLS 1, 11, 21, 1000 ... ONU apparatus 101, 1001 ... Optical fiber line 102, 1002 ... Electricity / light / light / electricity conversion part 104, 1004 ... Failure detection part 106, 1006 ... Interface conversion part 108 ... Path switching part 109 ... interface conversion unit 110, 310 ... wireless module unit 312 ... identifier storage unit 512 ... protocol service restriction processing unit 531 ... connection relation storage unit 532 ... fault location specifying unit

Claims (7)

An optical line termination device installed at the end of an optical communication network and connected to an optical fiber line constituting the optical communication network,
The optical fiber line is received by receiving an optical signal transmitted through the optical fiber line and converting the optical signal into an electric signal, or by converting the electric signal into an optical signal and outputting it to the optical fiber line. A conversion unit that performs communication using
A wireless module unit that converts an electrical signal into a wireless signal, or converts a wireless signal into an electrical signal and performs communication using a wireless line;
A failure detector that measures the optical signal and detects a failure of the optical fiber line;
When the failure detection unit detects a failure of the optical fiber line, a path switching unit that switches from communication using the optical fiber line to communication using the wireless line;
An optical line terminator characterized by comprising: When the optical fiber line in which the failure is detected is restored to a state where communication using the optical fiber line is possible, the path switching unit switches from communication using the wireless line to communication using the optical fiber line. The optical line terminator according to claim 1, wherein switching is performed. When the failure detection unit detects a failure of the optical fiber line and the path switching unit switches from communication using the optical fiber line to communication using the wireless line, in communication using the wireless line The optical line termination device according to claim 1, further comprising a restriction processing unit that restricts a predetermined communication protocol or a predetermined communication service. Having an identifier storage unit for storing identification information for uniquely identifying its own device;
When the failure detection unit detects a failure of the optical fiber line, the wireless module unit reads the identification information from the identifier storage unit, converts the identification information into a radio signal, and uses the wireless line The optical line termination device according to any one of claims 1 to 3, wherein the optical line termination device is transmitted by communication. 5. A plurality of optical line termination devices according to claim 4, a branching device for branching said optical fiber line and connecting said plurality of optical line termination devices, and connected to said optical communication network and installed on a station side A failure location detection device in a communication system comprising an optical line accommodation device and a failure location detection device connected to the optical communication network,
A connection relation storage unit for storing connection relation information of the optical line termination device in the optical communication network;
A failure location detection device comprising: a failure location identification unit that identifies a failure location of the optical fiber channel based on the identification information transmitted from the optical network termination device and the connection relation information. A communication path switching method in an optical line termination device having a communication function using a wireless line, installed at the end of an optical communication network, and connected to an optical fiber line,
A step of detecting a failure of the optical fiber line by measuring an optical signal transmitted through the optical fiber line by a failure detection unit;
A path switching unit that switches from communication using the optical fiber line to communication using the wireless line when a failure of the optical fiber line is detected by the failure detection unit; Communication path switching method. A plurality of optical line terminators installed at the end of an optical communication network constituted by optical fiber lines; a branching apparatus for branching the optical fiber lines to connect the plurality of optical line terminators; and the optical communication network And a fault location detection method in a communication system comprising: an optical line accommodation device connected to the plurality of optical line termination devices via a radio line; and a fault location detection device connected to the optical communication network,
The optical line termination device detects a failure of the optical fiber line by measuring a signal of the optical fiber line connected to the optical line termination apparatus;
When the optical line termination device detects a failure of the optical fiber, switching from communication using the optical fiber line to communication using the wireless line;
The optical line termination device transmits identification information for uniquely identifying its own device to the failure location detection device via the wireless line;
The failure location detecting device detects the failure location of the optical fiber line from the received identification information of the optical line termination device and connection relation information indicating a connection relationship of the plurality of optical line termination devices in the optical communication network. And a step of detecting the failure location.

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