JP5715425B2 - Optical network failure monitoring and detection apparatus, method, program and system - Google Patents

Description

The present invention is an optical system for identifying a fault location on an optical network by collecting fault information related to an optical core obtained from an optical line terminator installed on the use side and an optical line terminator installed on the station side. The present invention relates to an apparatus, method, program, and system for monitoring and detecting a network failure.

  Optical networks using optical fibers are used not only for Internet connection but also in various situations such as video-on-demand and primary telephones, and are technologies that are expected to rapidly spread in the future. As the network configuration of the optical network, one optical subscriber terminal device (OLT: Optical Line Terminal) and an optical subscriber network device (ONU: Optical Network Unit) provided in a station on the provider side are directly connected to one optical cable. There is a shared type PON (Passive) that has a low cost for laying an optical core wire, and has a shared type that is connected to a plurality of optical subscriber network devices by splitting a single cable into a plurality by an optical coupler along the way. The optical network method has become the mainstream. (Refer nonpatent literature 1 grade | etc.,).

  In order to realize a communication service, it is necessary to lay a large number of optical core wires. Therefore, in general, a large number of optical core wires are grouped into units called tapes, and multiple tapes and wires for laying cables are included. It is laid as a core optical cable. In addition, when an external force or the like is applied to the multicore optical cable, it is known that the optical core wire in the multicore optical cable is damaged and a connection failure occurs.

  However, the conventional monitoring device monitors only the optical subscriber termination device and the optical subscriber network device provided by the same manufacturer, and the transmission line is not monitored.

In general, the failure of communication service is a failure that requires early recovery, and existing optical subscriber termination devices and optical subscriber network devices are provided with a mechanism for grasping the situation regarding optical line conditions. On the other hand, existing optical subscriber termination devices and optical subscriber network devices are not equipped with a function for identifying a fault location on the optical core, and in order to detect a fault related to the optical core, an optical pulse is used. By using a test machine (OTDR: Optical Time Domain Reflectometer) separately, the fault location is specified.

  In order to detect the disconnection of the multicore optical cable, the optical pulse tester always connects the optical pulse tester to an arbitrary optical core in the multicore optical cable, and constantly monitors the state of the optical core to be monitored. When the multi-core optical cable is cut, the optical core wire to be observed is expected to be cut at the same location, so by estimating this cut and the cut location using information obtained from the optical pulse tester The failure part of the multi-core optical cable is identified.

  The OTDR method (pulse test method) is a method of measuring the optical power backscattered from different locations in the optical fiber over the entire length of the optical fiber by measurement from a single direction. In this test, an optical fiber is evaluated by utilizing a phenomenon in which a part of optical power returns to the incident side from an optical pulse propagating in the optical fiber. Factors for returning the optical power include Rayleigh scattering inherent to the material of the optical fiber, Fresnel reflection from the connection portion and the breaking point, and the like (see Patent Document 1, etc.).

  In the multi-core optical cable fault detection method using an optical pulse tester, the condition of a specific optical core wire in the multi-core optical cable is confirmed, so it is possible to detect a break in the multi-core optical cable that causes a fault. It is. For example, based on the intensity distribution data output from the optical pulse tester, it is detected whether there is an increase in loss due to bending deformation of the optical fiber, elongation distortion of the optical fiber, or deterioration of the optical fiber (patent document) (See 2nd grade).

  As a fault detection method for a multi-core optical cable using an optical pulse testing machine, the position display module has a built-in optical fiber having a relative refractive index different from that of the optical fiber of the optical fiber sensor line. There is also a proposal of a method for accurately and easily specifying the position of the position (see Patent Document 3).

  For monitoring optical cable lines, a hygroscopic container filled with a substance that reacts with water to generate heat or absorb heat is installed in close contact with or close to the optical cable, and the temperature measurement light contained in the optical cable. The fiber line is monitored from the terminal by an optical fiber temperature radar, and the temperature distribution in the longitudinal direction of the optical fiber line for temperature measurement and the transient change of the temperature distribution are evaluated. The optical pulse tester can monitor the presence or absence of disconnection of the optical line (see Patent Document 4).

  On the other hand, there is a proposal that does not use an optical pulse tester for the monitoring method of multi-core optical cables, and the optical cable for vibration sensors is laid and wired on a structural member for monitoring, such as a fence, and the additional effect that occurs when an intruder enters the fence. An optical fiber ring interference type vibration sensor in the optical cable for the vibration sensor that detects vibration at the vibration point, and can detect the vibration characteristics by detecting the intensity change of the interference light whose phase is modulated by the vibration. When the vibration sensor optical cable is cut by the above or the like, the cutting and the cutting position are detected by the cable cutting detection optical fiber (see Patent Document 5).

JP 2009-85684 A JP 2005-195486 A JP 2009-264830 A JP 2001-66224 A JP 2007-226440 A

“Development of Gigabit Ethernet-PON (GE-PON) System”, NTT Technical Journal, Vol. 17, no. 3, pp. 75-80, 2005.

  The OTDR method used as a failure detection method for a multicore optical cable is affected by the propagation speed in the optical fiber and the backscattering action of the optical fiber, and may not accurately measure the optical fiber loss. In addition, in a multi-core optical cable including a large number of optical core wires, partial cuts such as a part of the optical core wires in the multi-core optical cable being frequently affected by failures may occur frequently. When the optical core wire used for the operation was not affected by the partial cutting, the partial cutting could not be detected, and the failure detection method was assumed that the multi-core optical cable was completely cut.

  In addition, observation with an optical pulse tester is impossible to investigate the optical fiber core beyond the coupler. Therefore, the investigation by the optical pulse tester from the optical subscriber terminal side can only determine the failure up to the first-stage coupler, and the investigation of the optical core after the coupler is performed at the coupler installation location of the fault core. It was necessary to conduct an investigation again using an optical pulse tester, and it took a great deal of labor and time to identify the fault location.

The present invention relates to optical core information obtained from an optical subscriber network device, a core number to which the optical subscriber network device is connected, terminal coupler information to which the optical subscriber network device is connected, relationship between the optical core and a multi-core optical cable. Closure, which is a transmission line device that constitutes an optical network, by comprehensively considering information, relationship information between optical core wires and tapes in multi-core optical cables, coupler position information, optical network transmission line map information, etc. It is an object of the present invention to provide an optical network fault monitoring and detecting apparatus, method, program, and system for identifying a coupler, a multicore optical cable, a tape in the multicore optical cable, and a fault location of each optical core wire.

  In order to solve the above-described problems, the present invention collects failure information indicating disconnection of an optical core obtained from a general optical subscriber network device, and combines it with transmission path information related to the optical network, thereby combining the information on the optical network. Provided are a failure monitoring detection device, method, program, and system that enable identification of a failure location.

An optical network failure monitoring and detecting apparatus according to the present invention includes:
A status collection unit that collects status information of an optical subscriber network device installed at the end of the subscriber side from an optical subscriber termination device installed in a station on the provider side;
Optical core wire, coupler that branches the optical core wire, tape that bundles the optical core wire, multi-core optical cable that bundles the tape and optical core wire, extension of the multi-core optical cable, storage of the coupler, and closure of the optical core wire to the subscriber's home, light A subscriber terminal device, a transmission device information storage unit for storing information related to the optical network device of the optical subscriber network device, and
A failure detection unit that detects an optical network failure from the state of the optical subscriber network device collected by the state collection unit, and
From the status of the optical subscriber network device collected by the status collection unit and the information in the transmission device information storage unit, identify the optical core wire that passes through the cause of the optical network failure and the failure location on the multi-core optical cable, A fault location identifying unit that extracts an optical core wire for investigating a fault with an optical pulse tester,
It is provided with.

  The status collection unit collects status information of all optical subscriber network devices from the optical subscriber termination device.

Failure detection unit determines that the optical network failure when the state of the optical subscriber network devices via the same multi-core optical cable becomes multiple simultaneous offline. This offline optical subscriber network device will be referred to as a failed optical subscriber network device. This judgment method has fewer failures due to deterioration over time than optical networks such as copper wires, and there is no noise in the middle of the transmission line, and the number of offline optical subscriber network terminals gradually increases. When there is no failure and a failure occurs, the fact that all the optical subscriber network terminals under its control tend to go offline simultaneously is used.

Failure point identification unit, from the optical network end terminal branched at the coupler in the path of the forming department optical core a plurality of optical subscriber network system, disorders of all optical subscriber network system under the coupler is detected In some cases, the upstream optical core line on the optical subscriber termination device side connected to the coupler, or all the downstream optical core lines on the optical subscriber network device side connected to the coupler, have faulty light. determined to be core (optical core including fault location).

The fault location identifying unit, when a faulty optical core line is determined in a plurality of optical core paths, is included in a multi-core optical cable in a range where all faulty optical core lines overlap in each optical core path. Identify that there is a fault.

Failure point identification unit, if the range in which there is a failure point is identified, unused optical core and an optical subscriber network system is not in the end, only an optical subscriber network system was offline from the fault detection previously light core For each multi-core optical cable within the specified range, the percentage of faults in the optical core in the tape through which the faulty optical core passes is the fault optical core ratio (number of faulty optical cores ÷ fault optical core The number of optical core wires in the tape including the number of optical fiber cores ) is determined, and priorities are assigned in descending order of the optical fiber core rate to identify faulty locations.

  In detail, it is as follows.

  The fault location identifying unit first determines an optical core line that may pass through the fault location of the optical network. This optical core will be referred to as a fault optical core. Further, when a plurality of optical core lines pass through the fault location, they are collectively referred to as a fault optical core group. A specific identification method determines that the optical core upstream of the failed subscriber network device determined by the failure detection unit is the failed optical core. In addition, when the optical core line is branched into a plurality of optical core lines by a coupler upstream of the failed optical core line, if there is no online network device in the subscriber network via the coupler, the upstream of the coupler The optical core line is determined to be an obstacle optical core line. In addition, in the case where this one faulty optical core line passes through the fault location, and in the case where all the optical core lines directly under the coupler pass through the fault location, the subordinate optical subscriber network devices are in the same state. Become. From this, since there is a possibility that both of them pass through the faulty part at this stage, all the optical cores directly under this coupler are determined as faulty optical core groups. If there is another coupler upstream of the coupler, the same processing as described above is repeated to determine the fault optical core line and fault optical core group.

  Next, a possible location is identified as a failure location on the multicore optical cable in which the optical core wires are bundled and laid. A specific specifying method specifies a location where all fault optical core wires or fault optical core wire groups overlap in the multi-core optical cable as a fault location on the multi-core optical cable. For example, when there are two paths of optical core lines, and there is one fault optical core line and one fault optical core group, respectively, the first fault optical core line and the second fault optical core line overlap each other. Where the first fault optical core group and the second fault optical core group overlap, or where the first fault optical core group and the second fault optical core overlap, or the first fault optical core group and the second fault optical core The four patterns where the group overlaps are identified as the failure points on the multi-core optical cable. Note that it is determined that a faulty optical core line or a faulty optical core group having no overlapping part is not a faulty part (offline due to power failure of the optical subscriber network, not a fault).

Next, with the tape in the multi-core optical cable, the more likely locations are narrowed out of the possible locations. In an optical network failure, a failure often occurs in some optical core wires in the multicore optical cable. In this case, adjacent optical core wires often become obstacles at the same time. Generally, a tape has a shape in which 4 to 8 optical cores are arranged side by side. Therefore, in a multi-core optical cable, a location where a lot of tapes containing a high percentage of faulty optical cores is included is a fault location. It can be said that there is a high possibility. Here, the ratio of the obstruction optical core line is referred to as the obstruction optical core line ratio. As a specific specifying method, the failure rate is calculated by the following calculation formula, and the ranking of the possibility is given in the place where there is a possibility that the failure is determined as described above.
Faulty optical core rate = number of faulty optical cores ÷ number of optical cores in the tape that contains the faulty optical cores. However, unused optical cores that do not have an optical subscriber network device at the end, or optical subscriptions that were offline before the fault was detected. Optical cores that have only a network device are not included in this number.

The fault location identifying unit, when a certain range of fault locations is identified, out of the faulty optical core wires passing through the range, the optical core wire wired without going through the coupler as far as the optical pulse Extract for measurement on a testing machine. By measuring the extracted optical core wire with an optical pulse tester, it is possible to specify the cause of the failure and the location of the failure more accurately .

The present invention provides an optical network failure detection method.
An optical network failure detection method according to the present invention includes:
A state collection step for collecting state information of an optical subscriber network device installed at a terminal on the subscriber side from an optical subscriber terminal installed in a station on the provider side;
Optical core wire, coupler that branches the optical core wire, tape that bundles the optical core wire, multi-core optical cable that bundles the tape and optical core wire, extension of the multi-core optical cable, storage of the coupler, and closure of the optical core wire to the subscriber's home, light Reading information from a transmission device information storage unit for storing information related to optical network devices such as subscriber termination devices and optical subscriber network devices;
A failure detection step for detecting an optical network failure from the state of the optical subscriber network device collected by the status collection unit;
And the state of the optical subscriber network system collected by the status collection unit, the information transmission device information storage unit, a specific failure point on a particular and multicore optical cables of the optical core passing through the cause location of the optical network failure, In order to investigate the fault with the optical pulse tester, the fault location identifying step for extracting the most ideal optical core line,
It has.

  Furthermore, the present invention provides a program to be executed by a computer.

An optical network fault monitoring and detection program according to the present invention includes:
On the computer,
A state collection step for collecting state information of an optical subscriber network device installed at a terminal on the subscriber side from an optical subscriber terminal installed in a station on the provider side;
Optical core wire, coupler that branches the optical core wire, tape that bundles the optical core wire, multi-core optical cable that bundles the tape and optical core wire, extension of the multi-core optical cable, storage of the coupler, and closure of the optical core wire to the subscriber's home, light Reading information from a transmission device information storage unit for storing information related to optical network devices such as subscriber termination devices and optical subscriber network devices;
A failure detection step for detecting an optical network failure from the state of the optical subscriber network device collected by the status collection unit;
From the status of the optical subscriber network device collected by the status collection unit and the information in the transmission device information storage unit, identify the optical core wire that passes through the cause of the optical network failure and the failure location on the multi-core optical cable, A fault location identifying step for extracting an optical core for investigating faults with an optical pulse tester;
Is executed.

Furthermore, the present invention provides an optical network failure detection system.
The fault detection system according to the present invention includes:
A status collection unit that collects status information of an optical subscriber network device installed at the end of the subscriber side from an optical subscriber termination device installed in a station on the provider side;
Optical core wire, coupler that branches the optical core wire, tape that bundles the optical core wire, multi-core optical cable that bundles the tape and optical core wire, extension of the multi-core optical cable, storage of the coupler, and closure of the optical core wire to the subscriber's house, light A subscriber terminal device, a transmission device information storage unit for storing information related to the optical network device of the optical subscriber network device, and
A failure detection unit that detects an optical network failure from the state of the optical subscriber network device collected by the state collection unit, and
From the status of the optical subscriber network device collected by the status collection unit and the information in the transmission device information storage unit, identify the optical core wire that passes through the cause of the optical network failure and the failure location on the multi-core optical cable, A fault location identifying unit that extracts an optical core wire for investigating a fault with an optical pulse tester,
It is provided with.

  By utilizing the present invention, it becomes possible to quickly identify the failure location that has occurred in the optical core, so that early failure response can be started. Therefore, it is very effective for shortening the service stop time, and a great effect can be obtained particularly in an optical network that requires constant service such as primary telephone and video on demand.

  Furthermore, when it is estimated that there are a plurality of places where there is a possibility of a failure location, the failure location can be efficiently narrowed down because the administrator is notified in descending order of failure probability.

According to the present invention, it is possible to identify a wide range of failure factors from identification of a failure location on an optical core to identification of a failure location of a failure device constituting the optical network in accordance with information on the optical network. In addition, because failure location can be identified in order of priority, it is very useful information for actual failure recovery work, and not only shortens service downtime, but also has an effect on business improvement related to failure recovery. Big.

Block diagram of an optical network system targeted by the present invention Functional block diagram of optical subscriber network equipment Functional block diagram of optical subscriber termination equipment Block diagram of a fault monitoring and detecting apparatus according to the present invention Fault detection flowchart by fault monitoring and detecting apparatus according to the present invention Diagram explaining the basic idea of identifying a faulty optical core The figure explaining the specific example of the optical core wire with a fault of the optical network which has a two-stage coupler The figure explaining the specific example of the optical core wire with a fault of the optical network which has a two-stage coupler The figure explaining the example which identifies the range of a multi-core optical cable fault location from the information of a several optical core wire with a fault The figure explaining the example which pinpoints the range of a multi-core optical cable fault location from the information of the optical core wire which has a several stepped coupler with a fault The figure explaining the example of ranking of a failure part by calculating a failure optical core line rate with a tape in a multi-core optical cable The figure explaining the extraction example of the most ideal optical core line when investigating the trouble with the optical pulse tester

  The apparatus, method and system for monitoring and detecting an optical network failure according to the present invention are applied to both exclusive and shared optical network configurations. The difference between the occupancy type and the shared type is the difference between whether or not the optical core line is branched into a plurality of optical core lines in the middle, and here, an explanation will be given with an optical network configuration using a shared PON (Passive Optical Network) system. To do. Note that the optical network is a broad concept, and here, a portion of the optical network system 10 in FIG. 1 excluding the upper network 12 is referred to as an optical network.

  FIG. 1 is a diagram showing an outline of an optical network based on the PON system. The optical network system 10 is connected to an upper network 12 or the like on the Internet, and an optical subscriber terminal device 14 installed on a station side and optical subscriber network devices 20-1 to 7 installed on a user side are connected to an optical core ( Optical fiber) 16 and optical core 16 are connected by branching couplers 18-1 to 18-4.

  By installing couplers 18-1 to 18-4 for demultiplexing optical signals between the optical subscriber terminating device 14 and the optical subscriber network devices 20-1 to 20-7, a plurality of optical subscriber terminating devices 14 are provided with a plurality of optical subscriber terminating devices 14. The optical subscriber network devices 20-1 to 20-7 are connected. The optical subscriber network devices 20-1 to 20-7 convert the optical signal from the optical subscriber termination device 14 into an electrical signal, and also convert the electrical signal from a terminal device such as a personal computer used by the user into an optical signal. The data is transferred to the optical subscriber terminal device 14.

The optical subscriber termination device 14 transfers the optical signals from the optical subscriber network devices 20-1 to 20-7 to the upper network 12, and the optical signals from the upper network 12 to the optical subscriber network devices 20-1 to 20. And the optical core 16, the couplers 18-1 to 18-4 installed in a plurality of stages, and the optical subscriber network devices 20-1 to 7.

  The optical core 16 is rarely provided as a single unit, and is usually provided as a multi-core optical cable in which a large number of optical cores are bundled. In general, a multi-core optical cable including a large number of optical cores 16 is composed of a plurality of tapes in which a plurality of inner optical cores 16 are bundled.

FIG. 2 is a functional block diagram of the optical subscriber network device 20. Here, an EPON system capable of transmission using the ETHERNET (registered trademark) protocol as one of PON optical network technologies will be described as an example. The control unit 22 controls each functional unit to cause the optical subscriber network device 20 to operate. In order to prevent unauthorized access, the ONU authentication function unit 24 confirms that the user is a legitimate user, and then permits user communication after the PON link is established. The encryption function unit 26 encrypts communication. Downstream communication reaches the optical subscriber network system 20 of all hands. For this reason, communication encryption is performed to prevent data addressed to another optical subscriber network device 20 from being intercepted by spoofing the destination information of the optical subscriber network device 20.

  In the maintenance function unit 30, the maintenance monitoring interface between the optical subscriber termination device 14 and the optical subscriber network device 20 is defined as an OAM (Operations, Administration, and Maintenance) function in IEEE 802.3ah. Maintenance monitoring items are provided.

  The priority control function unit 32 ensures the service quality when providing a plurality of services to one user, particularly when quality assurance type communication such as VoIP (Voice Over IP) or video distribution is multiplexed. With priority control function, data with high priority is preferentially transmitted, so even if low priority data (Internet service) and high priority data (VoIP, video distribution, etc.) are input at the same time, It is possible to ensure quality.

  The PON interface function unit 28 is a connection interface with the PON system, and the NUI (Natural User Interface) port function unit 36 is a terminal device connection port such as a personal computer used by the user.

FIG. 3 is a functional block diagram of the optical subscriber termination device 14. The optical subscriber termination device 14 includes a control unit 22, an ONU authentication function unit 24, an encryption function unit 26, a maintenance function unit 30, a bridge function unit 34, and a PON interface function unit, including functions similar to those of the optical subscriber network device 20. 28, and a DBA (Dynamic Bandwidth Allocation) function unit 38 and an SNI (Server Name Indication) port function unit 40 .

  The DBA function unit 38 flexibly allocates a band to the optical subscriber network device according to the amount of uplink traffic. Therefore, an unused band can be allocated to other optical subscriber network devices, and the band can be used efficiently. In addition, since data such as VoIP and video distribution is required to be real-time, delay control is performed to prevent delay. The SNI port function unit 40 is a connection port with an upper network.

  FIG. 4 shows a connection state between the failure monitoring and detecting apparatus and the optical subscriber terminating apparatus according to the present invention. In the failure monitoring detection device 50, the status collection unit 54 is connected to the maintenance function unit 30 of the optical subscriber termination device 14, and collects status information regarding the optical subscriber network device 20 from the optical subscriber termination device 14.

  The transmission device information storage unit 56 includes information on the coupler 18 of the optical core line 16, information on the tape including the optical core line 16 to which the optical subscriber network apparatus 14 is connected, information on the multi-core optical cable, and optical subscriber network apparatus. Information related to the optical network such as information on the coupler 18 on the optical core 16 to which the optical network 20 is connected and position information and closure information on the coupler 18 on the optical core 16 to which the optical subscriber network device 20 is connected are stored. ing.

FIG. 5 is a flowchart showing a flow of processing from detection of a failure in the optical network , specification of a failure location , and finally notification of the result by the failure monitoring and detection apparatus 50 according to the present invention. Among steps S1～9, the fault detecting unit 58 in step S1~3 Figure 4, step S4~8 failure place specifying unit 60 of FIG. 4, the last step 9 is in the process contents of the display unit 62 of FIG. 4 .

  Hereinafter, the processing content will be described in the order of steps S1 to S9 in the flowchart of FIG. 5 with reference to FIGS.

The processing contents of the failure detecting unit 58, first, from the information collection unit 54 in step S1, acquires the status information of the optical subscriber network system 20. In step S2, it checks whether you are more simultaneously offline in an optical subscriber network system 20 via the same multi-core optical cable. If a plurality of simultaneous offlines can be confirmed in step S3, the process proceeds to the next failure location specifying unit.

The processing contents of the failure point identification unit 60, first, at step S4, to infer the fault light wire group from an optical subscriber network device 20 offline. Here, description will be made with reference to FIG.

  FIG. 6 is a diagram for explaining a basic concept for specifying a faulty core location and a faulty core group according to the present invention, including a first-stage coupler 18, and each optical subscriber network terminal thereafter. It shows that the single optical core wires 15-1 to 15-8 are dropped on 20-1 to 8, respectively. Also, it is assumed that all the optical subscriber network devices 20-1 to 20-8 are disconnected and are simultaneously made offline. Since the coupler 18 exists and no optical subscriber network devices 20-1 to 20-8 under the coupler 18 exist, the optical core 16 upstream of the coupler 18 is a fault optical core, and the coupler 18 is under control. The optical cores 15-1 to 15-8 are determined to be fault optical core groups.

The following example in FIG. 7 is an optical core having two-stage couplers, and it is assumed that the end coupler groups 201-1 to 201-4, in which the optical subscriber network devices are grouped, are all taken offline simultaneously as in FIG. Is. In this case, first, since there is no online device in each of the end coupler groups 201-1 to 4 under the couplers 18-2 to 5-5, the optical cores 16-2 to 5 are respectively fault optical cores. In addition, the single-core optical cores connected to the respective terminal coupler groups 201-1 to 20-4 are grouped into a single optical core group, and the optical core groups 17-1 to 17-4 become fault optical core groups. Further, since there is more couplers 18-1 upstream of the coupler 18-2～5, that absence of a single online ones to all end coupler group 201-1～4 its subordinate coupler 18 -1 upstream optical core 16-1 is also determined to be a fault optical core .

  FIG. 8 shows an example in which it is assumed that the network configuration is the same as that in FIG. 7, but only the terminal coupler group 201-1 is offline at the same time and the others are online. In this case, first, since the terminal coupler group 201-1 under the coupler 18-2 is offline at the same time, the optical core line 16-2 upstream of the coupler 18-2 is a fault optical core line, and the optical core group 17-1 Is determined to be a fault optical core group. In addition, although the coupler 18-1 exists further upstream of the coupler 18-2, since the online terminal coupler groups 201-2 to 4-4 exist under it, the optical core line 16-1 is not an obstacle optical core line. Can be determined.

  Next, in Steps S5 to S6, a location where the fault optical core line and the fault optical core group overlap on the multi-core optical cable is identified as a potential fault location. Here, description will be made with reference to FIG.

  FIG. 9 is a diagram for explaining a basic concept for identifying a location that may be a failure location according to the present invention. Optical cores 161 to 164 output from the optical subscriber termination device 14 are shown in FIG. , It passes through the multicore optical cables 90-1 to 90-4 and the closures 92-1 to 9-4 between them, and branches to the optical core groups 17-1 to 17-4 after branching at the couplers 18-1 to 18-4, respectively. Yes.

  The optical core group 17-1 is dropped by the coupler 18-1 in the closure 92-1, the optical core group 17-2 is dropped by the coupler 18-2 in the closure 92-2, and the optical core group 17-3 is In the closure 92-3, it is dropped by the coupler 18-3, and the optical core group 17-4 is dropped by the coupler 18-4 in the closure 92-4. Further, it is assumed that the connected end coupler groups 201-2 to 20-3 are simultaneously offline and the others are online.

  Before identifying the fault location, first, the fault optical core line and the fault optical core group are examined. For the first system, the optical core 162 is the fault optical core, the optical core group 17-2 is the fault optical core group, Regarding the second system, it can be determined that the optical core line 163 is a fault optical core line and the optical core group 17-3 is a fault optical core group. Next, as a fault location, a place where two systems overlap in the same multi-core optical cable is searched.

  First, since the fault optical core group 17-2 and the fault optical core group 17-3 are dropped outside the multi-core optical cable, they can be excluded from the current specific process.

  And it turns out that the failure optical core wire 162 and the failure optical core wire 163 overlap between the optical subscriber termination device 14 to the closure 92-2 in the same multi-core optical cable. As a result, it is possible to specify that the portion between the optical subscriber terminating device 14 and the closure 92-2 is a possible failure location.

  Next, a description will be given with reference to FIG.

In FIG. 10, the optical cores 161 to 164 output from the optical subscriber terminating device 14 pass through the multicore optical cables 90-1 to 90-5 and the respective closures 92-1 to 9, and the couplers 18-11 to 13, 18 respectively. -21 to 23 , 18-31 to 33 , after branching at 18-41 to 43, it is dropped to the optical core group 17-1 to 8 and connected to the end coupler group 201-1 to 8. .

  In the closure 92-1, it is dropped to the optical core group 17-1 by the couplers 18-11 and 18-12. In the closure 92-2, the optical fiber is dropped into the optical fiber group 17-2 by the coupler 18-13 and dropped into the optical fiber group 17-3 by the couplers 18-21 and 18-22. In the closure 92-3, the optical fiber is dropped into the optical fiber group 17-4 by the coupler 18-23 and dropped into the optical fiber group 17-5 by the couplers 18-31 and 18-32. In the closure 92-4, the optical fiber is dropped into the optical fiber group 17-6 by the coupler 18-33 and dropped into the optical fiber group 17-7 by the couplers 18-41 and 18-42. In the closure 92-5, the optical fiber is dropped into the optical core group 17-8 by the coupler 18-43.

  It is assumed that the end coupler groups 201-2 to 20-4 are simultaneously brought offline and the others are online.

First, when the fault optical core line and the fault optical core group are examined, for the first system, the optical core 161-3 is the fault optical core, the optical core group 17-2 is the fault optical core group, and the second system is optical. It can be determined that the core wire 162-1 is a fault optical core wire, and the optical core wires 162-2 to 3 and the optical core group 17-3 to 4 are fault optical core groups. Next, as a fault location, a place where two systems overlap in the same multi-core optical cable is searched. Then, it turns out that only the multi-core optical cable 90-1 and 2 overlap. Thereby, it can be specified that the fault location exists in the multi-core optical cable 90-1 or 90-2.

  Next, in step S7, the failure optical core line ratio is calculated with the tape included in the multi-core optical cable, and the failure locations are ranked. Here, description will be made with reference to FIG.

  FIG. 11 is a diagram for explaining a basic concept for ranking more likely failure locations even in locations that may be failure locations according to the present invention. The optical core wires 161 to 164 output from the optical subscriber terminating device 14 pass through the multi-core optical cables 90-1 to 90-4 and the closures 92-1 to 9-4 therebetween, and are branched by the couplers 18-1 to 18-4, respectively. It shows that it is dropped to the core group 17-1 to 4 and connected to the end coupler group 201-1 to 20-4.

  In the multi-core optical cable 90-1, the optical core wire 161 and the optical core wire 162 are bundled by the tape 94-11, and the optical core wire 163 and the optical core wire 164 are bundled by the tape 94-12. In the multicore optical cable 90-2, the optical core wires 161 and 164 are bundled by tapes 94-21 and 94-23, and the optical core wires 162 and 163 are bundled by tape 94-22. In the multi-core optical cable 90-3, the optical core wire 161 and the optical core wire 162 are bundled by the tape 94-31, and the optical core wire 163 and the optical core wire 164 are bundled by the tape 94-32. In the core optical cable 90-4, the optical core 161 is bundled by the tape 94-41 alone, and the optical cores 162 to 164 are bundled by the tape 94-42.

  Further, it is assumed that the connected end coupler groups 201-2 to 20-3 are simultaneously offline and the others are online.

  In this optical network, there is no branching caused by couplers, no drop from the closure, and the like, and all the multi-core optical cables are possible places of failure. Calculates the ratio of fault optical cores on the tape through which the fault optical core passes, and tries to rank the most likely locations.

First, when the fault optical core ratio is calculated with the multicore optical cable 90-1, the fault optical core passes through both the tape 94-11 and the tape 94-12.
Obstacle core ratio = number of obstructed optical cores ÷ number of optical cores in the tape containing the obstructed optical core
= 2 ÷ 4 = 0.5
It becomes.

In the multi-core optical cable 90-2, only the tape 94-22 passes through the fault optical core wire.
Obstacle core ratio = 2/2 = 1
It becomes.

In the multi-core optical cable 90-3, the obstacle optical core wire passes through both the tapes 94-31 and 94-32.
Obstacle core ratio = 2/4 = 0.5
It becomes.

In the multi-core optical cable 90-4, only the tape 94-42 passes through the fault optical core wire.
Obstacle core ratio = 2/3 = 0.666 ...
It becomes.

  Therefore, from this result, the highest possibility of the fault location can be ranked with the multi-core optical cable 90-2, and next the multi-core optical cable 90-4.

  Next, in step S8, the fault optical core wire wired without going through the coupler is extracted to the farthest for measurement by the optical pulse tester. Here, description will be made with reference to FIG.

FIG. 12 shows a network configuration similar to that of FIG. 10, and the optical core wires 161 to 164 output from the optical subscriber termination device 14 pass through the multicore optical cables 90-1 to 90-5 and the respective closures 92-1 to 92-4. , And after being branched by couplers 18-11 to 13 , 18-21 to 23, 18-31 to 33, and 18-41 to 43, they are dropped to the optical core groups 17-1 to 8-8.

  It is assumed that the end coupler groups 201-4 to 6-6 are simultaneously offline and the others are online.

  In the example as shown in FIG. 12, the fault optical core wire 163 wired farthest is the target.

  Finally, in step S9, the contents specified in steps S7 to S8 are notified to the person in charge of optical network maintenance on the display unit.

  The present invention further provides a program to be executed by the failure detection apparatus 50 of FIG. 4, which has the contents shown in the flowchart of FIG.

The present invention includes appropriate modifications that do not impair the objects and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

DESCRIPTION OF SYMBOLS 10: Optical network system 12: High-order network 14: Optical subscriber termination | terminus apparatus 15-1-8: Single-line optical core wire 16,16-1-5,161-164,161-1-3,162-1-3-3,163 -1 to 3 and 164-1 to 3: optical core wires 18, 18-1 to 5, 18-11, 18-12, 18-13, 18-21, 18-2218-23, 18-31, 18-32 , 18-33, 18-41, 18-42, 18-43: couplers 17-1 to 8: optical fiber group groups 20, 20-1 to 8: optical subscriber network devices 22, 52: control unit 24: ONU authentication Function unit 26: Encryption function unit 28: PON interface function unit 30: Maintenance function unit 32: Priority control function unit 34: Bridge function unit 36: NUI port function unit 38: DBA function unit 40: SNI port function 50: Fault monitoring and detection device 54: Status collection unit 56: Transmission device information storage unit 58: Fault detection unit 60: Fault location identification unit 62: Display unit 64: Input unit 90-1 to 4: Multi-core optical cable 92-1 5: Closure 94-11, 94-12, 94-21, 94-22, 94-23, 94-31, 94-32, 94-41, 94-42: Tape 201-1-8: End coupler group

Claims (10)

A status collection unit that collects status information of an optical subscriber network device installed at the end of the subscriber side from an optical subscriber termination device installed in a station on the provider side;
Optical core wire, coupler for branching the optical core wire, tape for bundling the optical core wire, multi-core optical cable for bundling the tape and the optical core wire, extension of the multi-core optical cable, storage of the coupler, and access to the customer's home A closure that draws an optical core, the optical subscriber termination device, a transmission device information storage unit that stores information about the optical network device of the optical subscriber network device, and
From the state of the optical subscriber network device collected by the state collection unit, a failure detection unit that detects an optical network failure;
From the status of the optical subscriber network device collected by the status collection unit and the information of the transmission equipment information storage unit, the identification of the optical core line passing through the cause of the optical network failure and the location of the failure on the multi-core optical cable It was identified, and failure point identification unit that extracts the optical core to investigate the fault in the optical pulse tester,
A failure monitoring and detection device comprising:
In the failure monitoring detection apparatus according to claim 1,
The status collection unit collects status information of all the optical subscriber network devices from the optical subscriber termination device;
A fault monitoring and detecting device characterized by the above.
In the failure monitoring detection apparatus according to claim 1,
The failure detection unit determines that an optical network failure has occurred when a plurality of optical subscriber network devices that are passing through the same multi-core optical cable are offline simultaneously.
A fault monitoring and detecting device characterized by the above.
In the failure monitoring detection apparatus according to claim 1,
The failure location specifying unit is a failure of all of the optical subscriber network devices under the coupler on a path of the optical core line that branches from the optical subscriber termination device by the coupler and connects the plurality of optical subscriber network devices . If There sensed, the optical core of upstream an optical line terminal apparatus connected to the coupler, or, all of the downstream is an optical subscriber network apparatus connected to said coupler Determining that the optical core is the faulty optical core ;
A fault monitoring and detecting device characterized by the above.
In the failure monitoring detection apparatus according to claim 4,
The fault location identifying unit is configured such that when the faulty optical core line is determined in a plurality of paths of the optical core lines, the faulty optical core lines are all overlapped in the paths of the optical core lines . to identify that there is a failure location in the multi-core optical the cable,
A fault monitoring and detecting device characterized by the above.
In the failure monitoring detection apparatus according to claim 5,
The failure location specifying unit , when a range with a failure location is specified , the unused optical core without the optical subscriber network device at the end, or the optical subscriber network device that has been offline since before failure detection For each of the multi-core optical cables within the specified range, the percentage of faults in the optical core line in the tape through which the faulty optical core line passes is not included, and the fault optical core ratio is not included. calculated as (number of optical core of the tape containing several ÷ fault light core failure light core), to identify the fault location with a priority to the high fault light core index order that,
A fault monitoring and detecting device characterized by the above.
In the failure monitoring detection apparatus according to claim 5,
The fault location identifying unit , when a certain range of the fault location is identified, the light that is routed without going through the coupler to the farthest of the faulty optical cores that pass through the range Extracting the core wire for measurement with an optical pulse tester;
A fault monitoring and detecting device characterized by the above.
A state collection step for collecting state information of an optical subscriber network device installed at a terminal on the subscriber side from an optical subscriber terminal installed in a station on the provider side;
Optical core wire, coupler for branching the optical core wire, tape for bundling the optical core wire, multi-core optical cable for bundling the tape and the optical core wire, extension of the multi-core optical cable, storage of the coupler, and access to the customer's home A step of reading information from a transmission device information storage unit for storing information about an optical network device of the closure for drawing an optical core, the optical subscriber terminal device, and the optical subscriber network device;
A failure detection step of detecting an optical network failure from the state of the optical subscriber network device collected in the state collection step;
From the status of the optical subscriber network apparatus collected in the status collection step and the information in the transmission equipment information storage unit, the identification of the optical core line passing through the cause location of the optical network failure and the location of the failure location on the multi-core optical cable It was identified, and failure location identification step of performing extraction of light core investigating Problems with the optical pulse tester,
A failure monitoring detection method comprising:
On the computer,
A state collection step for collecting state information of an optical subscriber network device installed at a terminal on the subscriber side from an optical subscriber terminal installed in a station on the provider side;
Optical core wire, coupler for branching the optical core wire, tape for bundling the optical core wire, multi-core optical cable for bundling the tape and the optical core wire, extension of the multi-core optical cable, storage of the coupler, and access to the customer's home A step of reading information from a transmission device information storage unit for storing information about an optical network device of the closure for drawing an optical core, the optical subscriber terminal device, and the optical subscriber network device;
A failure detection step of detecting an optical network failure from the state of the optical subscriber network device collected in the state collection step;
From the status of the optical subscriber network apparatus collected in the status collection step and the information in the transmission equipment information storage unit, the identification of the optical core line passing through the cause location of the optical network failure and the location of the failure location on the multi-core optical cable It was identified, and failure location identification step of performing extraction of light core investigating Problems with the optical pulse tester,
A fault monitoring detection program characterized by causing
A status collection unit that collects status information of an optical subscriber network device installed at the end of the subscriber side from an optical subscriber termination device installed in a station on the provider side;
Optical core wire, coupler for branching the optical core wire, tape for bundling the optical core wire, multi-core optical cable for bundling the tape and the optical core wire, extension of the multi-core optical cable, storage of the coupler, and access to the customer's home A closure that draws an optical core, the optical subscriber termination device, a transmission device information storage unit that stores information about the optical network device of the optical subscriber network device, and
From the state of the optical subscriber network device collected by the state collection unit, a failure detection unit that detects an optical network failure;
From the status of the optical subscriber network device collected by the status collection unit and the information of the transmission equipment information storage unit, the identification of the optical core line passing through the cause of the optical network failure and the location of the failure on the multi-core optical cable The fault location identifying unit that performs the extraction of the optical core wire in the previous period to identify and investigate the fault with the optical pulse tester,
A failure monitoring and detection system comprising:

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