JP2007064931A - Optical line failure monitoring device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical line failure monitoring device and a method, capable of specifying the optical line where failure arises, even when splitters and termination devices are connected to a tester in multiple stages by the optical lines. <P>SOLUTION: The device includes a group information recording part recording group information regarding which of each of the termination devices 4a-4f is connected to which of the splitters 3b-3d; a normal information recording part for recording the intensity of reflected light from the plurality of termination devices, in a condition where the optical lines f1-f10 have no failures generating; a monitoring information recording part for recording the intensity of reflected light from the plurality of termination devices during monitoring of failure of the optical lines; an attenuation quantity determination part for determining the termination device in which the intensity of reflected light is attenuated during monitoring of failure, with respect to the intensity of reflected light of the normal information; and a control part determining, that when the optical intensities of reflected light of all the termination devices connected to the same splitter are attenuated by the same value, it is determined that a failure is being generated between the splitters, to which the testers and all the termination devices are connected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical line monitoring apparatus and method for monitoring a failure occurring in an optical branch line such as a PON (Passive Optical Network) transmission line connecting between a test apparatus, a splitter, and a termination apparatus.

2. Description of the Related Art Conventionally, techniques for monitoring the state of an optical line connected to a termination device via a splitter connected to a test device are known (Patent Documents 1 and 2).
In these technologies, an optical signal is emitted from a test device to an end device via an optical line, and a change in the intensity of reflected light reflected from the end device is measured, whereby a light beam connected to which end device is connected. Judgment was made as to whether there was a road fault.
JP 2004-163175 A Japanese Patent No. 3580622

  However, in the techniques described in Patent Documents 1 and 2, when splitters are connected in multiple stages and the optical line is branched, reflected light is transmitted to the optical line between the first and second stage splitters. When a failure that causes attenuation occurs, the intensity of reflected light from all the termination devices connected to the optical line is affected. Therefore, information on whether a failure has occurred in the optical line between the first-stage splitter and the second-stage splitter or in the optical line between the second-stage splitter and the terminating device Could not get. In other words, there is a problem that the optical line where the failure has occurred cannot be specified.

  The present invention has been made in view of the above circumstances, and its purpose is to identify an optical line in which a failure has occurred even when a splitter and a terminating device are connected in multiple stages to the test apparatus by an optical line. It is an object of the present invention to provide an optical line monitoring apparatus and method that can be used.

  The present invention has been made to solve the above problems, and the invention according to claim 1 is branched from the test apparatus (2) by the splitter (3) and connected to the plurality of termination apparatuses (4). An optical line monitoring device (1) for monitoring a failure of the optical line (f), the group information recording means (14a) for recording group information as to which splitter each of the termination devices is connected to; A normal information recording means (14b) for recording the intensity of the reflected light from the plurality of terminating devices with respect to the optical signal emitted from the test apparatus in a state where no failure has occurred in the optical line; and the optical line A group of monitoring information recording means (14c) for recording the intensity of reflected light from the plurality of terminal devices with respect to an optical signal emitted from the test apparatus at the time of failure monitoring; and a group of the group information recording means Among the plurality of terminal devices recorded in the report, the intensity of the reflected light recorded in the monitoring information recording means is attenuated with respect to the intensity of the reflected light recorded in the normal information recording means Attenuation amount determining means (15) for determining termination devices and all termination devices connected to the same splitter are identified based on the group information recorded by the group information recording means, and all the termination devices are identified. If the attenuation amount determining means determines that the intensity of the reflected light is attenuated by the same value, a failure occurs between the test apparatus and the splitter to which all the termination apparatuses are connected. It has the 1st control means (12) which judges that it is carrying out, It is an optical line fault monitoring device characterized by things.

  Further, in the invention according to claim 2, when only the intensity of reflected light of any one of the plurality of termination devices recorded in the group information is attenuated, the attenuation amount determining means A second control means (12) for determining that a failure has occurred between the terminating device and the splitter to which the terminating device is connected when it is determined. 1.

  According to a third aspect of the present invention, there is provided an optical line for monitoring a failure of the optical line (f) branched from the test apparatus (2) by the splitter (3) and connected to the plurality of termination apparatuses (4). A monitoring method comprising: a first step of recording group information as to which splitter each of the termination devices is connected to; and an output from the test device in a state where no failure has occurred in the optical line. A second step of recording the intensity of the reflected light from the plurality of termination devices with respect to the optical signal, and a reflection from the plurality of termination devices with respect to the optical signal emitted from the test device when monitoring the failure of the optical line Of the plurality of termination devices recorded in the group information in the first step, the third step of recording the light intensity, and the third step for the reflected light intensity recorded in the second step. Based on the group information recorded in the first step, the fourth step of determining the terminal device in which the intensity of the reflected light recorded in step is attenuated and all the terminal devices connected to the same splitter If the fourth step determines that the reflected light intensity of all the termination devices is attenuated by the same value, the test device and all the termination devices are connected. And a fifth step of determining that a failure has occurred between the splitter and the splitter.

  According to a fourth aspect of the present invention, in the fourth step, when only the intensity of the reflected light of any one of the plurality of termination devices recorded in the group information is attenuated, 6. The method according to claim 3, further comprising a sixth step of determining that a failure has occurred between the termination device and the splitter to which the termination device is connected. This is an optical line fault monitoring method.

  The invention according to claim 5 is an optical line for monitoring a failure of the optical line (f) branched from the test apparatus (2) by the splitter (3) and connected to the plurality of termination apparatuses (4). In the monitoring method, at least one splitter is inserted between the test device and the termination device, group information about which splitter is connected to each of the termination devices, and there is a failure in the optical line. Intensities of reflected light from the plurality of termination devices with respect to an optical signal emitted from the test device in a state in which no occurrence occurs, and the plurality of optical signals emitted from the test device at the time of fault monitoring of the optical line Based on the intensity of the reflected light from the other terminating device, it is determined whether a fault has occurred in the upper or lower optical line of the splitter connected to the plurality of terminating devices. Is an optical path failure monitoring method comprising.

In the present invention, the group information is recorded in advance in the group information recording means, and the intensity of the reflected light from each terminal device when the optical line is normal is recorded in the normal information recording means in advance.
When the intensity of the reflected light obtained from all the terminal devices recorded in the group information at the time of failure monitoring is attenuated by the same value, it is connected to the test device and those terminal devices. It was determined that a failure occurred with the splitter.
For this reason, when a failure occurs in the optical line, the administrator or the like can roughly identify the location of the failure location, that is, isolate the failure location, and all the light beams connected to the test device, splitter, and termination device. It is no longer necessary to examine the state of the road in detail to identify the optical line where the failure has occurred, and the labor required for monitoring the optical line by an administrator or the like can be greatly reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an optical line monitoring system according to an embodiment of the present invention. This optical line monitoring system includes an optical line monitoring device 1, a test device 2, a splitter 3 (3a, 3b, 3c, 3d), and a termination device 4 (4a, 4b, 4c, 4d, 4e, 4f). In the present embodiment, a case where an OTDR (Optical Time Domain Reflectometer) is used as the test apparatus 2 and an ONU (Optical Network Unit) is used as the termination apparatus 4 will be described.
The optical line monitoring device 1 and the test device 2 are connected via a cable c1 such as RS232-C (Recommended Standard 232 version C) and are housed in one housing 1a. The test apparatus 2 and the splitter 3a are connected by an optical line f1, and the splitter 3a and the splitters 3b, 3c, and 3d are connected by optical lines f2, f3, and f4, respectively, and the splitter 3b and the termination apparatus 4a. 4b are connected by optical lines f5 and f6, respectively. The splitter 3c and the termination devices 4c, 4d, and 4e are connected by optical lines f7, f8, and f9, respectively, and the splitter 3d and the termination device 4f are connected by an optical line f10. The optical lines f1 to f10 are configured by a single optical fiber or the like.

The optical line monitoring apparatus 1 controls the test apparatus 2 via the cable c1 and acquires information on the waveform of the optical signal measured by the test apparatus 2. Based on the control of the optical line monitoring apparatus 1, the test apparatus 2 emits an optical signal toward the splitter 3a or an optical signal emitted from the splitter 3a via the optical line f1.
When an optical signal is incident from the test apparatus 2 or the splitter 3 connected to the upper side, the splitter 3 branches the optical signal with equal power and emits the optical signal to the splitter 3 or the terminal apparatus 4 connected to the lower side. To do. Further, when an optical signal from another splitter 3 or termination device 4 connected to the lower side of the splitter 3 is incident, these optical signals are combined and applied to the test device 2 or splitter 3 connected to the upper side. Exit. As the splitter 3, for example, a PLC (Planar Lightwave Circuit) type in which optical waveguides are branched in a tree shape on a quartz substrate can be used.
Here, the upper level means a direction in which the test apparatus 2 corresponding to the root of the optical line laid in a tree shape is connected from the test apparatus 2 to each termination apparatus 4. Further, the term “lower” refers to a direction in which the terminating device 4 corresponding to the leaves of the optical line laid in a tree shape is connected from the test apparatus 2 to each terminating device 4.

The termination device 4 reflects a specific wavelength of the optical signal to the splitter 3 when the optical signal from the splitter 3 is incident. As the termination device 4, for example, an optical connector having a built-in fiber grating filter that reflects an optical signal having a specific wavelength can be used.
In the present embodiment, the case where the splitters 3b to 3d are connected to the splitter 3a is described. However, the number of splitters 3 connected to the splitter 3a may be any number as long as it is equal to or less than the number of branches of the splitter 3. Good. Further, in the present embodiment, the case is described in which the termination devices 4a and 4b are connected to the splitter 3b, the termination devices 4c to 4e are connected to the splitter 3c, and the termination device 4f is connected to the splitter 3d. Any number of splitters 3 may be connected to each of the splitters 3b to 3d. In the present embodiment, the splitter 3a (first stage) and the splitters 3b to 3d (second stage) have a two-stage configuration, but any number of stages may be used.

FIG. 2 is a block diagram showing the configuration of the optical line monitoring apparatus 1 according to the present embodiment. The optical line monitoring apparatus 1 includes an input unit 11, a control unit 12, a test device connection unit 13, a recording unit 14, an attenuation determination unit 15, and a display unit 16. As the optical line monitoring device 1, a device such as a PC (Personal Computer) is used.
The input unit 11 includes an input device such as a keyboard. To the input unit 11, group information and the like regarding which splitter 3 each termination device 4 a to 4 f is connected to is input by the operation of the administrator of the optical line monitoring system according to the present embodiment.

The control unit 12 controls the input unit 11, the test apparatus connection unit 13, the recording unit 14, the attenuation amount determination unit 15, and the display unit 16 that constitute the optical line monitoring device 1. The test apparatus connection unit 13 is connected to the test apparatus 2 via a cable c1 (see FIG. 1). The test apparatus connection unit 13 emits an optical signal from the test apparatus 2 toward the splitter 3a via the optical line f1 based on the control of the control unit 12. Moreover, the test apparatus connection part 13 acquires the information of the waveform of the reflected light from each termination | terminus apparatus 4 which injects into the test apparatus 2 via the cable c1.
The recording unit 14 includes a group information recording unit 14a, a normal information recording unit 14b, and a monitoring information recording unit 14c. Group information input from the input unit 11 is recorded in the group information recording unit 14a.

FIG. 3 is a diagram illustrating an example of group information recorded in the group information recording unit 14a. As shown in the figure, the information of the termination device 4 connected to the same splitter 3 is recorded as group information separately for each group. For example, the termination devices 4a and 4b connected to the splitter 3b are recorded as a group g1.
In the normal information recording unit 14b, information on the intensity of the reflected light that is emitted from the test apparatus 2 through the splitter 3 and reflected by each terminal apparatus 4 is recorded in advance. The intensity of the reflected light recorded in the normal information recording unit 14b is the intensity of the reflected light from each terminating device 4 when no failure has occurred in the optical line f (f1 to f10).
The distance from the test apparatus 2 to each terminal apparatus 4 is different. Therefore, there is a difference in the time from when the optical signal is emitted from the test apparatus 2 to when the reflected light is incident. Therefore, which reflected light is the reflected light from which terminal device 4 is identified from the difference in time. can do.

In the monitoring information recording unit 14c, information on the intensity of the reflected light that is emitted from the test apparatus 2 via the splitter 3 and reflected by each terminal apparatus 4 is recorded. The monitoring information recording unit 14c records the intensity of the reflected light from each terminal device 4 when the failure monitoring is performed as to whether or not a failure has occurred in the optical line f (f1 to f10).
The attenuation determination unit 15 attenuates how much the intensity of the reflected light of the predetermined terminal device 4 recorded in advance in the normal information recording unit 14b is attenuated from the intensity of the reflected light recorded in the monitoring information recording unit 14c. Judge whether or not Further, the attenuation amount determination unit 15 determines whether or not the attenuation amount is the same value as the attenuation amount of the other end device 4 belonging to the same group.
The display unit 16 is configured by a liquid crystal display device or the like. The display unit 16 displays the waveform of the reflected light incident from each terminal device 4 or displays information on the optical line f where the failure has occurred.

Next, processing of the optical line monitoring system according to the present embodiment will be described.
FIG. 4 is a flowchart showing a processing flow of the optical line monitoring apparatus 1 according to the present embodiment. First, an administrator of the optical line monitoring system according to the present embodiment inputs group information to the input unit 11. The control unit 12 records the group information input to the input unit 11 in the group information recording unit 14a (step S01). Group information as shown in FIG. 3 is recorded in the group information recording unit 14a. Here, only the connection information between a certain splitter 3 and the termination device 4 is recorded as group information, but other information such as connection information between the splitters 3 may be recorded together.

  Next, the control unit 12 gives an instruction to the test apparatus 2 to emit an optical signal toward the splitter 3a in a state where no failure has occurred in the optical line f (f1 to f10). The optical signal emitted from the test apparatus 2 is branched by the splitters 3 laid in a tree shape, reflected by the termination apparatuses 4 and returned to the test apparatus 2. The test apparatus connection unit 13 acquires information on the waveform of the reflected light incident on the test apparatus 2, and the control unit 12 records the information on the waveform of the reflected light in the normal information recording unit 14b (step S02).

  Next, the control unit 12 determines whether or not an instruction for starting the failure monitoring of the optical line is input from the input unit 11 (step S03). If no instruction has been input, “NO” is determined in the step S03, and the process proceeds to the step 03 again. On the other hand, if an instruction is input, “YES” is determined in the step S03. Then, the control unit 12 instructs the test apparatus 2 to emit an optical signal to the optical line f1. The optical signal emitted from the test apparatus 2 is branched by the splitters 3 laid in a tree shape, reflected by the terminal apparatuses 4, and returned to the test apparatus 2. The test apparatus connection unit 13 acquires information on the waveform of the reflected light incident on the test apparatus 2, and the control unit 12 records the information on the waveform of the reflected light in the monitoring information recording unit 14c (step S04).

  Next, the control unit 12 acquires information on a predetermined termination device 4 connected to the optical line f to be monitored from the input unit 11, and sets the termination device 4 as the target device (step S05). Then, the attenuation amount determination unit 15 attenuates the intensity of the reflected light of the target device recorded in the monitoring information recording unit 14c as compared with the intensity of the reflected light of the target device recorded in the normal information recording unit 14b. It is determined whether or not (step S06).

If the intensity of the reflected light is not attenuated, “NO” is determined in step S06, and the display unit 16 displays that no failure has occurred in the optical line f between the test apparatus 2 and the target apparatus. This is notified to the administrator or the like (step S07).
On the other hand, if the intensity of the reflected light is attenuated, “YES” is determined in step S06, and it is determined whether the device connected to the higher rank of the target device is the test device 2 or the splitter 3. To do. That is, it is determined whether the splitter 3 is further interposed between the test apparatus 2 and the light is not branched (step S08). In the case of the test apparatus 2, it is determined as “test apparatus” in step S08, and by displaying on the display unit 16 that a failure has occurred in the optical line f between the test apparatus 2 and the target apparatus. The administrator is notified (step S09).

On the other hand, in the case of the splitter 3, it is determined as “splitter” in step S08, and by referring to the group information recording unit 14a, it is determined whether or not another terminal device 4 exists in the same group as the target device. (Step S10). The same group means connected to the same splitter. If no other termination device 4 exists, “NO” is determined in step S10, and the display unit 16 displays that a failure has occurred in the optical line f between the test device 2 and the target device. The administrator or the like is notified (step S11).
On the other hand, if another termination device 4 exists, “YES” is determined in step S10, and the intensity of the reflected light of all termination devices 4 belonging to the lower group of the splitter 3 to which the target device is connected is also determined. It is determined whether or not the attenuation is the same value as the attenuation in the target device (step S12).

If it is not attenuated by the same value, “NO” is determined in step S12, and it is determined that a failure has occurred in the optical line f between the splitter 3 to which the target device is connected and the target device. An administrator or the like is notified by displaying on the display unit 16 (step S13).
On the other hand, if it is attenuated by the same value, “YES” is determined in step S12, and the device connected to the higher rank of the target device is set as the target device again (step S14). Then, the process proceeds to step S08 described above.

Next, the processing flow of the optical line monitoring apparatus 1 when a failure has actually occurred in the optical line f will be described with reference to the flowchart of FIG.
FIG. 5 is a diagram illustrating a state in which the failure X1 occurs in the optical line f5 in the optical line monitoring system according to the present embodiment. It is assumed that no failure occurs in the optical lines f1 to f4 and f6 to f10 other than the optical line f5. In this case, since the optical signal emitted from the test apparatus 2 is attenuated when passing through the optical line f5, the intensity of the reflected light from the termination apparatus 4a is attenuated.
In the optical line monitoring device 1, the processing of steps S01 to S04 in FIG. 4 is performed, and the termination device 4a is set as the target device in step S05. In step S06, since the intensity of the reflected light of the terminal device 4a that is the target device is attenuated, it is determined as “YES”. In step S08, since the splitter 3b is connected to the upper end of the terminal device 4a that is the target device, it is determined as “splitter”. In step S10, since there are a plurality of termination devices 4a and 4b below the splitter 3b to which the termination device 4a that is the target device is connected, the determination is “YES”. In step S12, among the reflected light intensities of the terminal devices 4a and 4b belonging to the lower group g1 of the splitter 3b, the intensity of the reflected light of the terminal device 4b is not attenuated, so that it is determined as “NO”. . Then, in step S13, the administrator or the like is notified by displaying on the display unit 16 that a failure has occurred in the optical line f5 between the splitter 3b and the terminating device 4a that is the target device.

  FIG. 6 is a diagram illustrating a state in which the failure X2 occurs in the optical line f2 in the optical line monitoring system according to the present embodiment. It is assumed that no failure has occurred in the optical lines f1, f3 to f10 other than the optical line f2. In this case, since the optical signal emitted from the test apparatus 2 is attenuated when passing through the optical line f2, the intensity of the reflected light from the termination apparatuses 4a and 4b is attenuated by the same value. Among the processes when the failure X2 occurs in the optical line f2 in FIG. 6, the processes in steps S01, S02, S03, S04, S05, S06, S08, and S10 described in FIG. The description of this process is omitted.

  After step S10, in step S12, since the intensity of the reflected light of all the termination devices 4a and 4b belonging to the lower group g1 of the splitter 3b is attenuated by the same value, “YES” is determined. In step S14, the splitter 3b connected to the host device 4a, which is the target device, is set again as the target device. In step S08, since the splitter 3a is connected above the splitter 3b, which is the target device, it is determined as “splitter”. In step S10, since there are a plurality of terminal devices 4a to 4f below the splitter 3a to which the splitter 3b as the target device is connected, it is determined as “YES”. In step S12, the intensity of the reflected light of the terminal devices 4a and 4b among the terminal devices 4a to 4f belonging to the lower groups g1 to g3 of the splitter 3a is attenuated, but the reflected light of the terminal devices 4c to 4f is attenuated. Since the intensity of is not attenuated, it is determined as “NO”. In step S13, the administrator is notified by displaying on the display unit 16 that a failure has occurred in the optical line f2 between the splitter 3a and the splitter 3b as the target device.

  FIG. 7 is a diagram illustrating a state in which the failure X3 occurs in the optical line f1 in the optical line monitoring system according to the present embodiment. It is assumed that no trouble occurs in the optical lines f2 to f10 other than the optical line f1. In this case, since the optical signal emitted from the test apparatus 2 is attenuated when passing through the optical line f1, the intensity of the reflected light from the terminal apparatuses 4a to 4f is attenuated by the same value. Of the processes when the failure X3 occurs in the optical line f1 in FIG. Since the processing is duplicated, the description of these processing is omitted.

  After step S10, in step S12, the intensity of the reflected light of all the termination devices 4 of the termination devices 4a to 4f belonging to the lower groups g1 to g3 of the splitter 3a is attenuated by the same value. judge. In step S14, the splitter 3a connected above the splitter 3b, which is the target device, is set again as the target device. In step S08, since the test apparatus 2 is connected to the upper side of the splitter 3a as the target apparatus, it is determined as “test apparatus”. In step S09, the manager or the like is notified by displaying on the display unit 16 that a failure has occurred in the optical line f1 between the test apparatus 2 and the splitter 3a.

  According to the optical line monitoring system according to the above-described embodiment, group information about which terminal device 4 is connected to which splitter 3 is recorded in the group information recording unit 14a in advance (FIG. 4). Step S01). In addition, the intensity of the reflected light from each terminating device 4 when no failure has occurred in the optical line f is recorded in advance in the normal information recording unit 14b (step S02 in FIG. 4). Then, when the intensity of the reflected light of the terminating device 4 connected to the same splitter 3 as group information is attenuated by the same value when monitoring the failure of the optical line f, these terminating devices 4 are connected in common. It is determined that a failure has occurred in the optical line f. Therefore, when a failure occurs in any of the optical lines f1 to f10, the administrator or the like examines the state of the optical line f connected to the test apparatus 2, the splitter 3, and the terminating apparatus 4 one by one. It is no longer necessary to specify the optical line in which a failure has occurred, and the labor required for monitoring the optical line by a manager or the like can be greatly reduced.

In the description of FIGS. 5, 6, and 7 described above, a case where a failure has occurred in any one of the optical lines X <b> 1, X <b> 2, and X <b> 3 has been described. When a failure occurs simultaneously in the optical line at the location, the administrator or the like may be notified of the optical line f that may have failed.
For example, when the intensity of the reflected light from the terminating device 4a and the terminating device 4b is different, and the intensity of the reflected light is not attenuated for the other terminating devices 4c to 4f, the terminating device 4a. It is possible to determine that a failure has occurred in the optical line f1 common to the termination device 4b and to determine that a failure has occurred in one or both of the optical lines f4 and f5.

  In the embodiment described above, a program for realizing the functions of the control unit 12, the test apparatus connection unit 13, and the attenuation amount determination unit 15 of FIG. 2 is recorded on a computer-readable recording medium. The optical line monitoring system may be controlled by causing the computer system to read and execute the program recorded in (1). Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” dynamically holds a program for a short time, like a communication line when a program is output via a network such as the Internet or a communication line such as a telephone line. In this case, it is also assumed that a server that holds a program for a certain time, such as a volatile memory inside a computer system that serves as a server or client. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within the scope not departing from the gist of the present invention.

1 is a schematic configuration diagram of an optical line monitoring system according to an embodiment of the present invention. It is a block diagram which shows the structure of the optical line monitoring apparatus 1 by this embodiment. It is a figure which shows an example of the group information recorded on the group information recording part 14a. It is a flowchart which shows the flow of a process of the optical line monitoring apparatus 1 by this embodiment. In the optical-line monitoring system by this embodiment, it is the figure which showed the state in which the failure X1 has generate | occur | produced in the optical line f5. In the optical-line monitoring system by this embodiment, it is the figure which showed the state in which the failure X2 has generate | occur | produced in the optical line f2. In the optical-line monitoring system by this embodiment, it is the figure which showed the state in which the failure X3 has generate | occur | produced in the optical line f1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical-line monitoring apparatus, 1a ... Housing | casing, 2 ... Test apparatus, 3 (3a-3d) ... Splitter, 4 (4a-4f) ... Termination apparatus, 11 ... Input unit, 12 ... control unit, 13 ... test device connection unit, 14 ... recording unit, 14a ... group information recording unit, 14b ... normal information recording unit, 14c ... monitoring information Recording unit, 15 ... attenuation determination unit, 16 ... display unit, c1 ... cable, f (f1-f10) ... optical line

Claims (5)

An optical line monitoring device (1) for monitoring a failure of an optical line (f) branched from a test device (2) by a splitter (3) and connected to a plurality of termination devices (4),
Group information recording means (14a) for recording group information as to which splitter each of the terminal devices is connected to;
Normal information recording means (14b) for recording the intensity of the reflected light from the plurality of termination devices with respect to the optical signal emitted from the test device in a state where no failure has occurred in the optical line;
Monitoring information recording means (14c) for recording the intensity of the reflected light from the plurality of termination devices with respect to the optical signal emitted from the test device at the time of fault monitoring of the optical line;
Of the plurality of terminal devices recorded in the group information of the group information recording means, the reflected light recorded in the monitoring information recording means with respect to the intensity of the reflected light recorded in the normal information recording means An attenuation amount determining means (15) for determining a terminal device in which the intensity of
Identify all termination devices connected to the same splitter based on the group information recorded by the group information recording means, and if the intensity of the reflected light of all the termination devices is attenuated by the same value A first control means (12) for determining that a failure has occurred between the test apparatus and the splitter to which all of the termination devices are connected, when the determination is made by the attenuation determination means; ,
An optical line fault monitoring apparatus comprising:   When the attenuation amount determining means determines that only the intensity of the reflected light of any one of the plurality of termination devices recorded in the group information is attenuated, the termination device and its 2. The optical line fault monitoring apparatus according to claim 1, further comprising second control means (12) for determining that a fault has occurred with the splitter to which the terminating device is connected. An optical line monitoring method for monitoring a failure of an optical line (f) branched from a test apparatus (2) by a splitter (3) and connected to a plurality of termination apparatuses (4),
A first step of recording group information as to which splitter each said end device is connected to;
A second step of recording the intensity of reflected light from the plurality of termination devices with respect to an optical signal emitted from the test device in a state where no failure has occurred in the optical line;
A third step of recording the intensity of the reflected light from the plurality of termination devices with respect to the optical signal emitted from the test device at the time of fault monitoring of the optical line;
Among the plurality of termination devices recorded in the group information in the first step, the intensity of the reflected light recorded in the third step is attenuated with respect to the intensity of the reflected light recorded in the second step. A fourth step of determining which end device is present;
Identify all the termination devices connected to the same splitter based on the group information recorded in the first step, and if the intensity of the reflected light of all the termination devices is attenuated by the same value, If it is determined in the fourth step, a fifth step for determining that a failure has occurred between the test apparatus and the splitter to which all the termination devices are connected;
An optical line fault monitoring method comprising:   When it is determined in the fourth step that only the intensity of the reflected light of any one of the plurality of termination devices recorded in the group information is attenuated, the termination device and its 4. The optical line fault monitoring method according to claim 3, further comprising a sixth step of determining that a fault has occurred with the splitter to which the terminating device is connected. An optical line monitoring method for monitoring a failure of an optical line (f) branched from a test apparatus (2) by a splitter (3) and connected to a plurality of termination apparatuses (4),
At least one splitter is inserted between the test device and the termination device;
Reflection light from the plurality of termination devices with respect to the group information regarding which splitter each of the termination devices is connected to and the optical signal emitted from the test device in a state where no failure has occurred in the optical line Of the splitter connected to the plurality of termination devices based on the intensity of the reflected light from the plurality of termination devices with respect to the optical signal emitted from the test device when monitoring the fault of the optical line An optical line fault monitoring method, comprising: determining whether a fault has occurred in an upper or lower optical path.

Images