JPH0974382A - Optical fiber network monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber network monitoring system for easily recognizing the operating conditions of the entire system. SOLUTION: This system is provided with a work station 10, plural terminals 20 for control connected to the work station 10 and coated optical fiber selectors 40 and test devices 30 for monitoring connected to the terminals 20 for the control. Then, the coated optical fiber selector 40 is provided with an optical fiber changeover switch 41 for switching a coated optical fiber, a command analysis part 42 for analyzing a control command and a switch control part 43 for controlling the optical fiber changeover switch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber network monitoring system for monitoring an optical subscriber network using an optical fiber.

[0002]

2. Description of the Related Art With the development of optical communication in recent years, optical fiber networks have been deployed to subscribers' homes in each district. Therefore, the conventional optical fiber network monitoring system is distributed in each area in order to monitor the optical fiber network deployed in each area without omission. The conventional optical fiber network monitoring system arranged in each area is an optical fiber core selection device for selecting an optical fiber core wire to be monitored, and a monitoring test device for monitoring the selected optical fiber core wire, And a control device for controlling these devices. Therefore, in order to control the optical fiber core selection device or the monitoring test device in each area, it was necessary to use the control device in that area.

[0003]

The conventional optical fiber network monitoring system is usually operated unattended, and the selection of the optical fiber core and the monitoring of the optical fiber core are performed according to the contents programmed in advance. It was For this reason, it was difficult for the administrator to grasp the operation status of the entire optical fiber network monitoring system distributed in each district. Further, even when an abnormality occurs in any of the systems, it is difficult for the administrator to quickly grasp this abnormal state.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide an optical fiber network monitoring system in which the operation status of the entire system can be easily grasped.

[0005]

In order to solve the above problems, an optical fiber network monitoring system of the present invention comprises a plurality of control terminals and a plurality of control terminals, each of which is connected to the control terminal and constitutes an optical fiber network. A plurality of optical fiber core selection devices that house optical fiber selection switches that select the optical fiber cores to be monitored from among the optical fiber cores, and are connected to the control terminal, respectively. A system comprising a plurality of monitoring test devices for monitoring the selected optical fiber core wire, further comprising a workstation for connecting a plurality of control terminals and controlling a plurality of control terminals in an integrated manner, The optical fiber core selection device is an optical fiber selector switch for switching the optical fiber cores and a command for analyzing a control command transmitted from a workstation via a control terminal. And it includes an analyzing unit, and a switch control unit for controlling the optical fiber change-over switch based on the control command analyzed by the command analysis unit.

Here, the workstation is provided with a modem to which one end of the public line is connected, and the optical fiber core wire selection device can be directly operated by another system connected to the other end of the public line via the modem. It is good to be configured.

Further, the optical fiber core wire selection device is provided with a history information storage unit for storing operation history information of the optical fiber core wire selection device, and the operation history information stored in the history information storage unit is read by the workstation. It should be possible.

Furthermore, the optical fiber core wire selection device is provided with an error information storage unit for storing error information when an abnormality occurs in the optical fiber core wire selection device, and the error information stored in the error information storage unit is It should be readable by the workstation.

Furthermore, the optical fiber core wire selection device is
It is preferable that the apparatus includes an operation status output unit that outputs operation status data of the optical fiber core wire selection device in real time, and the operation status data output from the operation status output unit can be monitored by the workstation.

According to the optical fiber network monitoring system of the present invention, the control command transmitted from the workstation is transmitted to any one of the optical fiber core line selecting devices via the control terminal. The control command transmitted to the optical fiber core wire selection device is given to the command analysis unit, and the control command is analyzed. Then, the analysis result is given to the switch controller, and the execution control of the optical fiber changeover switch is performed based on the analysis result. In this way, control commands can be transmitted from one workstation to the scattered optical fiber core selection devices, and the workstations can directly control the optical fiber core selection devices.

If the optical fiber core wire selection device is provided with a history information storage unit, the operation history information stored in this history information storage unit can be read by the workstation. For this reason, the operation status of each optical fiber core wire selection device can be grasped on the workstation side.

Similarly, if the optical fiber core wire selection device is provided with an error information storage unit, the error information stored in this error information storage unit can be read by the workstation. Therefore, it is possible for the workstation side to grasp whether or not an abnormality has occurred in each optical fiber core wire selection device.

[0013]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing the configuration of an optical fiber network monitoring system 1 according to an embodiment of the present invention. Further, FIG. 2 is a block diagram showing the configuration of the optical fiber core selection device 40. As shown in FIG. 1, the optical fiber network monitoring system 1 is a network system having a three-layer tree structure. A workstation 10 is provided in the upper layer of the optical fiber network monitoring system 1, and a plurality of control terminals 20 are provided in the middle layer of the optical fiber network monitoring system 1. Further, a plurality of monitoring test devices 30 and a plurality of optical fiber core selection devices 40 are provided in the lower layer of the optical fiber network monitoring system 1. And
A plurality of control terminals 20 are connected to the workstation 10, and a plurality of monitoring test devices 30 and a plurality of optical fiber core selection devices 40 are connected to each control terminal 20. Therefore, each control terminal 20 can directly control the monitoring test device 30 and the optical fiber core wire selection device 40 connected thereto.

As shown in FIG. 2, the optical fiber core wire selection device 40 transmits a control command transmitted from the workstation 10 via the optical fiber selector switch 41 for switching the optical fiber core wires and the control terminal 20. A communication control unit (command analysis unit) 42 for analyzing and a switch control unit 43 for controlling the optical fiber changeover switch 41 based on the control command analyzed by the communication control unit 42 are provided. Further, the optical fiber core wire selection device 40 includes a history information storage unit 44 that stores operation history information of the device, an error information storage unit 45 that stores error information when an abnormality occurs in the device, and a communication control unit 42. And a CPU 46 that controls the switch control unit 43.

Further, the workstation 10 has an I
A modem 50 to which one end 60a of a public line 60 such as the NS net 64 is connected is provided. Therefore, the workstation 10 uses the public line 60 via the modem 50.
It is possible to send and receive data to and from the out-of-office terminal 70 connected to the other end 60b of the.

The monitoring test device 30 measures the time from the introduction of signal light into the optical fiber core to be monitored until the signal light is reflected back inside the optical fiber core. Device (ie, OTDR), etc. Here, if there is a defect such as a disconnection in the middle of the optical fiber core, the signal light is reflected in the middle, so by measuring the time until the signal light returns, there is a defect in the optical fiber core. Whether or not it can be easily determined. The optical fiber core selection device 40 selects an optical fiber core to be monitored from a plurality of optical fiber cores forming the optical fiber network, and the optical fiber core and the monitoring test device 30. It is a device for optically connecting and. Therefore, by using the monitoring test device 30 and the optical fiber core selection device 40 in combination, the monitoring test device 30 switches the optical fiber cores to be monitored sequentially by the optical fiber core selection device 40. By measuring, it is possible to monitor all of the plurality of optical fiber core wires forming the optical fiber network.

As the history information storage section 44 and the error information storage section 45, a memory such as a flash memory that can be electrically partially erased and partially rewritten is used. Further, the history information storage unit 44 and the error information storage unit 45 are provided with security functions such as user authentication and data encryption (decryption). The operation history information stored in the history information storage unit 44 includes information about the number of times the optical fiber changeover switch 41 has been switched, information about control commands received by the communication control unit 42, and the like. Further, the error information stored in the error information storage unit 45 includes information on the device number of the error occurrence, information on the error content, and the like. Further, as the information on the error content, there is information on the operation error in the optical fiber changeover switch 41, information on the format error of the control command received by the communication control unit 42, and the like.

As described above, each control terminal 20 can control the optical fiber core selection device 40 connected thereto, but the workstation 10 can also control the optical fiber core selection device 40. You can That is, the workstation 10 can transmit an encrypted control command to any of the optical fiber core selection devices 40 via the control terminal 20, and the transmitted control command first It is transmitted to the control terminal 20. Here, the control command means the optical fiber changeover switch 41.
A command for controlling the. The control command that has reached the control terminal 20 is once decrypted by the control terminal 20, the content of the control command is analyzed, and then encrypted again and transmitted to the desired optical fiber core wire selection device 40. It

The control command transmitted to the optical fiber core selection device 40 is given to the communication control unit 42, and the control command is decoded and analyzed. Then, the analysis result is given to the switch control unit 43, and the execution control of the optical fiber changeover switch 41 is performed based on the analysis result. As described above, by transmitting the control command from the workstation 10 to the optical fiber core selection device 40, any of the optical fiber core selection devices 40 can be directly controlled by the workstation 10.

The optical fiber core selection device 40 can also be controlled from the out-of-station terminal 70 connected to the workstation 10. That is, the out-of-office terminal 70 can send an encrypted control command to the workstation 10, and the sent control command is propagated through the public line 60 and is transmitted via the modem 50 to the workstation 10. To reach. The control command that has reached the workstation 10 is further transmitted to the optical fiber core wire selection device 40, and the control command is decoded and analyzed. Then, the execution control of the optical fiber changeover switch 41 is performed based on the analysis result of this control command. In this way, by transmitting the control command from the out-of-station terminal 70 to the workstation 10, any of the optical fiber core selection devices 40 can be directly controlled by the out-of-station terminal 70.

Further, the workstation 10 can read the operation history information stored in the history information storage section 44 and the error information stored in the error information storage section 45. That is, the workstation 10 uses the control terminal 20 to determine which optical fiber core selection device 40
Also, the encrypted read command can be transmitted to the control terminal 20 and the transmitted read command is transmitted to the control terminal 20. Here, the read command refers to the history information storage unit 44 or the error information storage unit 45 as needed.
A command to read information from. The read command that has reached the control terminal 20 is once decoded by the control terminal 20 and the content of the read command is analyzed.
It is encrypted again and the desired optical fiber core wire selection device 40
Is transmitted to

The read command transmitted to the optical fiber core wire selection device 40 is given to the communication control unit 42, and the read command is decoded and analyzed. Then, based on the analysis result, the CPU 46 controls reading of information from the history information storage unit 44 or the error information storage unit 45.
Done by The information read by the CPU 46 is encrypted and transmitted to the workstation 10 via the control terminal 20. Then, the information reaching the workstation 10 is decrypted, and the decrypted information is displayed on a display device (not shown) included in the workstation 10. By observing this display screen, the administrator can confirm the operation history of the optical fiber core selection device 40 and the abnormality occurrence of the optical fiber core selection device 40.

When the administrator operates the workstation 10 and the out-of-office terminal 70, it is necessary to previously input the login name and password to authenticate the user.
Also, the operation history information and the error information can be read by the out-of-office terminal 70.

Next, an example of the optical fiber core wire selection device 80 having an online monitor function will be described with reference to FIG. FIG. 3 is a block diagram showing the configuration of the optical fiber core wire selection device 80. As shown in FIG. 3, the optical fiber core wire selection device 80 includes an optical fiber selector switch 81 for switching the optical fiber core wires, a communication control unit 42 for analyzing a control command, and a switch control for controlling the optical fiber selector switch 81. It includes a unit 82 and a timer 83 that generates a timer signal. In addition, the optical fiber core wire selection device 80 includes a history information storage unit 44 that stores operation history information.
And an error information storage unit 45 that stores error information, and a CPU that controls the communication control unit 42 and the switch control unit 43.
46.

Further, the optical fiber selector switch 81 is
A pulse motor 81a for driving a drive portion (for example, a fiber moving stage, an aligning device, etc.) of the optical fiber changeover switch 81, and an encoder 81b for monitoring the drive amount of the pulse motor 81a are provided. Further, the switch control unit 82 counts the number of pulses of the pulse generator 82a that gives a pulse signal to the pulse motor 81a and the pulse signal (pulse signal corresponding to the drive amount of the pulse motor 81a) output from the encoder 81b. And a counter (operation status output unit) 82b.

Since the optical fiber core wire selecting device 80 is configured as described above, the work condition of the optical fiber core wire selecting device 80 can be continuously monitored by the workstation 10 or the out-of-office terminal 70. it can. That is, CPU
Under the control of 46, the pulse generator 82a generates a pulse signal, and the pulse motor 81a is driven by this pulse signal. As described above, while the pulse motor 81a is being driven, the number of pulses of the pulse signal generated by the pulse generator 82a and the number of pulses counted by the pulse counter 81b are equal to a certain timer cycle (for example,
It is read by the CPU 46 every 10 ms). This timer period can be obtained based on the timer signal generated by the timer 83.

The two types of pulse number data read out by the CPU 46 are transmitted to the workstation 10 or the out-of-office terminal 70, and the workstation 10 or the out-of-office terminal 70 operates the optical fiber core selection device 80. Can be monitored online. Further, the two types of pulse number data read by the CPU 46 can be stored in the history information storage unit 44.

[0028]

As described in detail above, the optical fiber network monitoring system of the present invention includes a workstation, a plurality of control terminals connected to the workstation, and a control terminal connected to these control terminals. The optical fiber core wire selecting device includes an optical fiber core wire selecting device and a monitoring test device. The optical fiber core wire selecting device includes an optical fiber changeover switch for switching the optical fiber core wires, a command analysis section for analyzing a control command, and an optical fiber changeover switch. And a switch control unit for controlling. Therefore, the control command transmitted from the workstation is transmitted to any one of the optical fiber core wire selection devices via the control terminal. In the optical fiber core wire selection device to which the control command is transmitted, the command analysis unit analyzes the control command, and based on the analysis result, the execution control of the optical fiber changeover switch is performed.

As described above, by transmitting the control command from the workstation to the optical fiber core selection device, any of the optical fiber core selection devices can be directly controlled by the workstation. Therefore, even when a plurality of optical fiber core selection devices are scattered in various places, all the optical fiber core selection devices can be centrally managed by the workstation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical fiber network monitoring system.

FIG. 2 is a block diagram showing a configuration of an optical fiber core selection device.

FIG. 3 is a block diagram showing an example of an optical fiber core wire selection device having an online monitor function.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical fiber network monitoring system, 10 ... Workstation, 20 ... Control terminal, 30 ... Monitoring test device, 40
... optical fiber core wire selection device, 41 ... optical fiber changeover switch, 42 ... communication control section (command analysis section), 43 ... switch control section, 44 ... history information storage section, 45 ... error information storage section, 50 ... modem, 60 ... Public line, 82b ... Pulse counter (operation status output unit).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoichi Hata, 1st Tayacho, Sakae-ku, Yokohama-shi, Kanagawa Sumitomo Electric Industries, Ltd. Yokohama Works (72) Naoki Nakao 1-1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corp. (72) Inventor Naoyuki Atobe 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corp.

Claims (5)

[Claims] 1. A plurality of control terminals and an optical fiber selection for selecting an optical fiber core to be monitored from a plurality of optical fiber cores connected to the control terminal and forming an optical fiber network. A plurality of optical fiber core wire selection devices each accommodating a switch, and a plurality of monitoring test devices each connected to the control terminal and monitoring the optical fiber core wires selected by the optical fiber core wire selection device are provided. In the optical fiber network monitoring system, further comprising a workstation that connects the plurality of control terminals and integrally controls the plurality of control terminals, and the optical fiber core wire selection device switches the optical fiber core wires. An optical fiber changeover switch, a command analysis section for analyzing a control command transmitted from the workstation via the control terminal, and the command analysis Optical fiber network monitoring system characterized by comprising in based on the analyzed control command and a switch controller for controlling the optical fiber change-over switch. 2. The workstation comprises a modem to which one end of a public line is connected, and the optical fiber core wire selection device is another system connected to the other end of the public line via the modem. The optical fiber network monitoring system according to claim 1, wherein the optical fiber network monitoring system is configured to be directly operable. 3. The optical fiber core wire selection device includes a history information storage unit that stores operation history information of the optical fiber core wire selection device, and the operation history information stored in the history information storage unit is the history information storage unit. The optical fiber network monitoring system according to claim 1, wherein the optical fiber network monitoring system is readable by a workstation. 4. The optical fiber core wire selection device includes an error information storage unit that stores error information when an abnormality occurs in the optical fiber core wire selection device, and is stored in the error information storage unit. The error information can be read by the workstation.
4. The optical fiber network monitoring system according to claim 3. 5. The optical fiber core wire selection device includes an operation status output unit that outputs the operation status data of the optical fiber core wire selection device in real time, and the operation status data output from the operation status output unit is The optical fiber network monitoring system according to any one of claims 1 to 4, wherein the workstation can be monitored.