JP2003234708A - Optical network system in sewerage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that work is troublesome and is not efficient since it is necessary to confirm an optical fiber cable, to measure the confirmed cable and to collate resulting measured data with conventional data. <P>SOLUTION: A computer simultaneously manages information on the optical fiber cable laid in a sewerage system, the map information of the sewerage system, various kinds of information and the measured information of the optical fiber cable. The measured information and desired information can be monitored and displayed on a map as graphic information. A marker for measurement is provided at a position in the optical fiber cable corresponding to a prescribed position on the map, light is made incident to the optical fiber cable, a distance to a loss generating means or reflected light generating means is measured and a difference between the measured length (real length) and a distance (designed length) to the relevant position on the map is corrected such that corrected data can be automatically updated in a database. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewer optical network system in which an optical fiber cable is laid in a sewer facility and the facility can be maintained and managed by a computer by measuring the optical fiber cable. .

[0002]

2. Description of the Related Art In the sewerage field, we are engaged in the maintenance and management of sewerage facilities in response to the aging of the population and the declining birthrate that will continue in the future, from the construction of facilities to the maintenance and management. Shortage of human resources is expected. In Japan, the sewerage facilities are connected by optical fiber cables, and not only the shortage of human resources is compensated but also the promotion of the sewerage optical network system aiming at the advanced management in the future is undertaken as a national policy.

A sewer optical network system for maintaining and managing sewer facilities by an optical network system has already been introduced in some local governments. This system lays an optical fiber cable in a sewerage facility (pipe, manhole, etc.), the cable information about the specifications and wiring of the optical fiber cable, and the sewer pipe piping route,
Based on map information about sewerage facilities such as manhole installation locations and sewage treatment plant locations, a computer can detect anomalies in the optical fiber cables laid in the sewerage facilities and detect the optical fiber cables laid in the sewerage facilities. It is for regular inspection, maintenance, and management. This sewer optical network system is also used for other purposes.

The optical fiber cable is an optical pulse tester (O
TDR) can be used to measure such things as cable length, optical transmission loss, and local loss increase. Therefore, inspections at the time of installation of optical fiber cables installed in sewer facilities, periodic inspections after installation, abnormalities, etc. Measurement by OTDR is also used for confirmation. For example, when detecting an abnormality that occurred in the optical fiber cable laid in the sewer facility or when regularly inspecting the optical fiber cable laid in the sewer facility, check the optical fiber cable to be measured based on the cable information. Then, the confirmed optical fiber cable is measured by OTDR, and the obtained measurement data is collated with the previous measurement data to detect abnormalities in the sewerage facility and manage the abnormality.

However, at present, in the sewerage field, it is difficult to secure human resources for managing and operating these sewer optical network systems, and automation of these management and operation is required. In addition, in the management of sewerage facilities, the sewerage ledger has been digitized (the sewerage ledger system) for several years, but the penetration rate is still low, and most local governments use paper.

[0006]

The current sewer optical network system described above has the following problems. 1. Checking the optical fiber cable, measuring the confirmed optical fiber cable, and collating the measurement data obtained by this with the conventional measurement data must be done individually, which is time-consuming, time-consuming, and inefficient. It was target. 2. The sewage optical network system currently in progress is configured separately from the sewage ledger system that covers all the sewage facility information and the optical fiber monitoring device that inputs and measures optical signals, and manages both of them together. It's just that. Both cannot be centrally managed in real time. 3. Since the current sewer ledger system is created on the premise of ledger management, it is necessary to expand the function to implement the sewer optical network system such as connection information of the optical fiber core wire and core wire usage information. 4. Since the actual length and the designed length of the laid optical fiber cable are different (for example, extra length is always generated when laying the optical fiber cable), even if an accident or disconnection of the optical fiber cable occurs , The accident point cannot be retrieved from the system. For this reason, when an accident occurs, it is necessary to search for the accident point due to processes such as water stoppage, pipe cleaning, and accident point search, which requires a great deal of cost and takes several weeks to recover from the accident.

[0010]

The object of the present invention is to collectively manage the measurement information of the optical fiber cable in cooperation with the existing cable information, the sewer ledger, and the map information on the sewer facility, and to lay it in the sewer facility. It is possible to display on the monitor screen the abnormal location of the optical fiber cable that occurs due to the abnormal occurrence of the optical fiber cable, and to easily check the abnormal location and the abnormal situation of the optical fiber cable laid in the sewer facility. It is to provide a sewer optical network system that can.

In the sewer optical network system according to claim 1 of the present invention, cable information such as specifications, wiring and connection of the optical fiber cable laid in the sewer facility,
A sewer optical network system for detecting abnormalities in sewer facilities by computers and performing periodic inspections based on map information and other information about sewer facilities such as sewer piping routes, manhole installation locations, and sewage treatment plant locations. In the above, the measurement information obtained by measuring the optical fiber cable can be collectively managed by the computer together with the cable information, the map information of the sewerage facility and various information.

In the sewer optical network system according to claim 2 of the present invention, in the sewer optical network system according to claim 1, among the collectively managed measurement information, cable information, map information of sewer facilities and various information, The desired information can be displayed on a map as graphic information on a monitor.

The sewer optical network system according to claim 3 of the present invention is the sewer optical network system according to claim 1 or 2, wherein the optical fiber cable is used for measurement at a position corresponding to a predetermined position on the map. The marker is used as the loss generating means or the reflected light generating means, the measuring light is input to the optical fiber cable to measure the position to the loss generating means or the reflected light generating means, and the measurement length (actual length) And the distance to the position corresponding to the marker on the map (design length) is corrected, and the corrected data is automatically updated in the database.

In the sewer optical network system according to claim 4 of the present invention, in the sewer optical network system according to claim 3, the loss generating means or the reflected light generating means is bent, axial misalignment, optical fiber connection of the optical fiber cable, It is a connector connection, a filter, a sewer facility management sensor (for example, a light water level meter) having a built-in fiber black grating (FBG), a fiber connection box connection, a branch box, a termination box, and the like.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) A sewer optical network system of the present invention is installed in a sewer facility by LAN equipment such as Ethernet (registered trademark) or other communication means as shown in FIG. The optical fiber cable 6 is composed of a monitoring device 1 capable of measuring and monitoring, and an information management device 2. The monitoring device 1 includes an optical pulse tester (for example, OTDR) 3 and an optical fiber selector 4.
And a terminal device 5 such as a personal computer or a dedicated machine connected to these via an RS232C interface.

The optical pulse tester (OTDR) 3 receives an optical pulse from one end of an optical fiber cable and is reflected by Rayleigh scattering, a break point, a mirror effect on the exit side of the optical fiber, or the like and returned to the entrance side. Measure the light,
The data is averaged and displayed on a monitor, and the waveform of the data is observed to make it possible to measure the optical fiber connection loss, transmission loss, line length, fault position, and the like. In this embodiment, the optical pulse tester 3 measures the optical fiber cable 6 based on a command input from the terminal device 5,
The result is output to the terminal device 5.

When the optical fiber cable 6 is measured as described above, a measurement marker is provided at a position corresponding to a predetermined position on the map of the optical fiber cable, and the measuring light is input to the optical fiber cable. Measure the distance to the marker, and if there is a difference between the measured length to the marker (actual length) and the distance to the location corresponding to the marker on the map (design length),
It can be automatically corrected so that the corrected data is automatically updated in the database. The marker can be loss generating means or reflected light generating means.
The loss generating means or the reflected light generating means can be realized as follows, for example. Bend the optical fiber cable so that loss may occur, misalign the core of the cable, connect other optical fiber or connector with different transmission loss to the optical fiber cable, and install a filter to reflect light. To connect. Further, a sewerage facility management sensor (for example, a light water level meter) having a built-in fiber black grating (FBG) is connected to cause a loss, or a loss is caused by connecting a fiber junction box, a branch box, a termination box, or the like. You may do it.

The optical fiber selector 4 shown in FIG.
Based on the command input from the optical fiber tester 3, the fiber cores in the multiple optical fiber cables 6 are switched and connected to the optical pulse tester 3. For example, a 24-fiber optical fiber cable 6 accommodating 6 4-core optical fibers 7 as shown in FIG. 2 (a) as shown in FIG. When the optical signal is propagated using two cores of the wires and the remaining two cores are emptied, the optical fiber selector 4 uses one of the used core wires (monitoring core wire) in each of the optical fibers 7. The optical pulse tester 3 is connected in a predetermined cycle and order, and one of the air core wires (monitoring spare core wire) is connected to the optical pulse tester 3 in a cycle different from the connection cycle of the monitoring core wires. Further, when the optical fiber selector 4 connects all the monitoring cores in any one of the optical fibers 7 to the optical pulse tester 3, the monitoring cores in the other optical fiber 7 are connected to the optical pulse tester 3 in the same manner as described above. , And the order of the optical fibers 7 to be connected is set in advance. Further, the connection period of the preliminary monitoring core wire is set longer than that of the monitoring core wire.

As shown in FIG. 1, the information management device 3 displays a database 10 in which attribute information, graphic information, and monitoring information are stored and stored, and information stored in the database 10 and adds information. A terminal device (for example, a computer or a dedicated device) 11 for updating or the like is provided. As shown in FIG. 3, the attribute information includes facility attributes, equipment attributes, connection information, route information, and blank map information. Specifically, cable information regarding specifications of optical fiber cables, wiring, etc., and sewer pipes. Includes various information on sewerage facilities such as route, manhole size and material.
Further, the attribute information includes “display attribute items” in Tables 1 to 8.
It contains information about the matters listed in the column. Table 1 is a manhole (MH) attribute, Table 2 is a conduit attribute, Table 3 is a facility attribute, Table 4 is a customer attribute, Table 5 is a connection box attribute, Table 6 is a cable attribute, and Table 7 is an optical fiber cable installation route. Attributes, Table 8 shows the core attributes of the optical fiber cable. In the tables shown in Tables 1 to 6, a table is formed for each attribute, predetermined information is extracted from each table as necessary, and the extracted information is combined to form one information. It is designed to be displayed on the monitor of the device 11 (FIG. 1). The blank map information is map information (other than graphic data) of the area where the sewer optical network is arranged.

[0025]

[Table 1]

[0026]

[Table 2]

[0027]

[Table 3]

[0028]

[Table 4]

[0029]

[Table 5]

[0030]

[Table 6]

[0031]

[Table 7]

[0032]

[Table 8]

As shown in FIG. 3, the graphic information is plane graphic, system graphic, and graphic data relating to the blank map. Among them, the plane figure is a figure showing a sewer pipe route, a manhole (MH) installation location, a sewerage facility such as a sewerage treatment site installation, an optical fiber installed and devices connected thereto. The system diagram is a diagram showing the installed optical fiber together with the devices connected to it, and the blank map is a map of the area managed by the sewer optical network system. Here, the graphic information and the attribute information are associated with each other as necessary. For example, the equipment on the plane graphic or the optical fiber cable displayed on the monitor of the terminal device 11 of the information management device 2 shown in FIG. When the user clicks to specify the equipment or optical fiber cable shown in the plane or system graphic, the attribute information related to this is displayed on the monitor.
The attribute information displayed on the monitor is one piece of information configured by combining information extracted from each table formed for each attribute as described above. The equipment and the optical fiber cable can be designated based on their names. The route attribute shown in Table 7 and the core wire attribute shown in Table 8 are the desired cable number or cable from the accommodation cable list included in the attribute information displayed on the screen of the terminal device 11 in FIG. 1 as described above. Displayed by specifying the first name. In addition to this, the above-mentioned respective information can be associated with each other as necessary, and when any one of the information is designated, desired information related thereto can be displayed.

The monitoring information shown in FIG. 3 is the optical pulse tester 3
Information regarding the monitoring conditions of the optical fiber cable 6 (specifically, the monitoring core wire and the monitoring spare core wire in FIG. 2), the monitoring result information (measurement information) by the optical pulse tester 3, and the monitoring result comparison target. It is information including initial data that becomes
Of these, the initial data is the result of measurement by the optical pulse tester 3 for the predetermined measurement items related to the optical fiber cable when the system was constructed, and by comparing this with the monitoring result, disconnection and local loss of the optical fiber cable. It is the basis for determining the presence or absence of an increase or other abnormality. The monitoring conditions in FIG. 3 are information regarding the measurement conditions when the initial data is collected. The monitoring information is linked with the route information of FIG. 3 using the route number as a key.
For example, the monitoring information about the optical fiber cable of the route can be retrieved from the route number. At this time, the latest monitoring information regarding the optical fiber cable can be searched, the monitoring information in the past can be searched, and the monitoring information from the past to the present can be searched in a list format.

Of the information shown in FIG. 3, the blank map information and blank map are obtained by converting commercially available electronic map software into a database 10 by converting it so that it can be used in the sewer optical network system of the present invention. The system graphic of FIG. 3 is created based on the device attribute and the connection information. The monitoring result is transmitted from the terminal device 5 (FIG. 1) of the monitoring device 1 to the information management device 2 via LAN equipment such as Ethernet or other communication means, and the database 10
(FIG. 1). The other information is obtained by converting the information accumulated in the conventional database into the database 10 (FIG. 1) by converting it so that it can be used in the sewer optical network system of the present invention.

The administrator uses the terminal device 11 of the information management apparatus 2 of FIG. 1 to collectively manage all of the attribute information, graphic information, and monitoring information, and obtain necessary information when necessary. I can do it. Since the monitoring information of the optical fiber cable 6 is automatically stored in the database 10 and updated as needed, the periodical inspection of the optical fiber cable can be performed only by searching and confirming the monitoring information of the optical fiber cable 6. It will be possible.

As described above, according to the sewer optical network system of the present invention in which the attribute information, the graphic information, and the monitoring information are collectively managed and desired information can be displayed on the monitor, the following functions are provided. Can also be realized. 1. Failure cable automatic monitoring function This function automatically monitors the optical fiber cable in the sewer optical network, and when a failure such as disconnection or increase in loss occurs in the optical fiber cable, immediately identify the location of the failure on the map (plan It is a function to display the influence range of the fault and the detour route of the fault occurrence point on the map while displaying the map on the map and the system diagram). Specifically, for example, as shown in FIG. 1, an icon (FIG. 4a) on the monitor of the terminal device 11 of the information management device 2 is clicked to activate a program for realizing the function. When the program is started, monitoring information, graphic information, and other necessary information are read from the database 10 of FIG. 1, and these information are processed and monitored on the monitor of the terminal device 11 of FIG. 1 as shown in FIG. 4B. The system diagram is displayed. In the monitoring system diagram, the target monitoring route is highlighted (for example, displayed in a different color from other routes).

Next, according to the monitoring information (monitoring conditions) input to the database 10, the optical pulse tester 3 (FIG. 1) measures the optical fiber cable 6 of the monitoring route, and the obtained monitoring is performed. Information (monitoring result) is transmitted from the terminal device 5 (FIG. 1) of the monitoring device 1 to the information management device 2. Specifically, all or part of the cable length from the monitoring start position to the end, cumulative loss and reflection amount, loss value and reflection amount in each junction box, and cable loss amount between junction boxes are measured, and the obtained monitoring is performed. The result is transmitted to the information management device 2. It should be noted that the monitoring results are all transmitted to the information management device 2 regardless of whether the target optical fiber cable 6 has an abnormality or not, and are accumulated in the database 10 and updated automatically or by manual operation as necessary. I am doing it.

As shown in FIG. 4 (c), the monitor of the terminal device 11 to which the monitoring result has been transmitted displays the initial value of the initial data input to the database and the result value based on the transmitted monitoring result. When the difference between the initial value and the result value is within the specified range, the word "Normal end" is displayed at the bottom of the screen as shown in the figure. When the difference between the initial value and the result value exceeds the predetermined range, for example, as shown in FIG.
A monitoring system diagram is displayed in which an abnormal place as shown in (e) is highlighted. Specifically, if the cable length from the monitoring start position to the end is shorter than the initial value, it is judged as a cable break, and if the reflection amount / cumulative loss is larger than the initial value, it is judged as a cable abnormality, and the loss value / reflection in each junction box If the amount is larger than the initial value, it is judged that the cable is abnormal, and if the amount of cable loss between the junction boxes is larger than the initial value, it is judged that the cable is abnormal (deteriorated). However, the final judgment is made by the administrator. At this time, various information necessary for the final determination can be retrieved and displayed on the monitor. The initial value, which is the standard for determining the presence or absence of an abnormality, is measured several times for the same optical fiber cable when the initial data is created and changed to a value with fluctuations to some extent. Is specified.

Next, the graphic information, the connection information and other necessary information are read from the database 10, and the information is processed to obtain a plan view showing an abnormal place as shown in FIG. 4 (f), an abnormal place, A system diagram showing the range of influence and the detour route that bypasses it is displayed on the monitor. Here, since the optical fiber cable has a surplus length portion and the like, the measured fiber length and the sewer pipe length do not match. That is,
If the optical fiber cable has an extra length, if an abnormality is found at a position of 5 km from the measurement position by the measurement of the optical pulse tester, the abnormality actually occurs at a position of less than 5 km from the measurement position. It will be. Therefore, when an abnormal place is specified and displayed on the plan view, the error is corrected to specify a more accurate abnormal place. The range of influence is specified as the span between nodes.

Further, the detour route is automatically searched for the shortest route connecting both ends of the fault occurrence span based on the air-core information input to the database 10 as a part of the core attribute (Table 8). There is. When a spare core wire provided in the optical fiber 7 in the optical fiber cable 6 in which an abnormality has occurred, another optical fiber 7 in the same optical fiber cable 6, and a spare optical fiber cable are laid on the detour route, Since there are three routes for the spare optical fiber cable, the priority order is set in advance. Generally, the priority is determined in the order of the spare core wire in the same optical fiber 7, another optical fiber 7 in the same optical fiber cable 6, and the spare optical fiber cable. The measurement waveform of the optical fiber cable in which the failure has occurred can be displayed on the monitor together with the graphic information.

2. Core line management function This function is a function to display information on the management area managed by each sewerage treatment plant, the optical fiber cable in the area, and other information as needed. On the street. ． The management area of each sewage treatment plant is displayed as a whole area chart (control chart). Also, the area display of the treatment area / drainage area is switched by operating the display area (layer). ． Designate the address (municipalities, large letters, chome, block, etc.) and display the sewerage facilities existing in the designated area and the optical fiber cables laid there on the plan view and system diagram. ． Display the route specified on the system diagram on the floor plan.
At this time, sewer facilities (manholes, culverts, basins, treatment plants, etc.) can be highlighted. ． Display the distribution of cables with air cores on the system diagram. Further, a cable cross-sectional view shows which optical fiber 7 in the designated optical fiber cable 6 has an air core wire. ． Display device information, connection information, and customer information. ． By designating sewer facilities (manholes, culverts, etc.) on the plan view, it is possible to carry out a simulation in the case where the optical fiber cable housed in the facility has a disconnection failure. At this time, the list of customers affected by the disconnection failure is displayed and the recovery route is detected.

3. Data input function This function is used for information that has not been converted into a database (S
(Other than EMIS data and blank map data) is individually input to the database of the sewer optical network system of the present invention. By this function, various information other than the above information is collectively managed together with the above data, and is displayed on the monitor as necessary. Can be made.

(Other Embodiments) In principle, the sewer optical network system of the present invention is installed in a key station of the sewer optical network, but it is also installed in a substation as needed. That is, it is also installed in the sub station in the following cases. If there are important substations that need to be monitored, the installation situation of optical fiber cables is complicated, and if the sewer optical network system is installed only in the key station and cannot be managed sufficiently, an optical pulse tester Monitoring range (20 ~
When it is desired to monitor a location exceeding 30 km), there is an exchange installed between the termination box and the termination box, and the key station cannot monitor the substations beyond the exchange.

Surveillance equipment identified by manual operation 1
Alternatively, it is possible to monitor (measure) only two or more optical fiber cables. Manual operation is particularly effective in collecting initial data of the optical fiber cable when it is installed.

The monitoring information collected by a plurality of key stations can be made available to the master station in the same way as the network management information through the backbone network that is set up around the master station.

The sewer optical network system of the present invention can be used in cooperation with other existing systems and new systems. For example, it is possible to link with a sewer ledger system that covers sewer facility information, a sewer advanced management system, or the like.

[0060]

The sewer optical network system according to claims 1 to 4 of the present application relates to the measurement information obtained by measuring the optical fiber cable, the information about the optical fiber cable laid in the sewer facility, and the sewer facility. Since the map information and various information are automatically linked and collectively managed, there are the following effects. 1. Since the management and operation of the optical fiber cable laid in the sewerage facility can be automated, the time and effort required for the management and operation can be greatly reduced, and efficient management and operation can be achieved. 2. Even if there is no human who can manage and operate the sewer optical network system, the latest data can be used for smooth management and operation. 3. By collectively managing the measurement information about the optical fiber cable in cooperation with the sewer led electronic system that covers the sewer facility information, it is possible to accumulate the sewer ledger data without expanding the function of the sewer led electronic system. In addition, since the data is updated in real time, it is easy to computerize the sewer ledger, and customer management related to sewerage can be automatically performed, and the latest data can be managed more efficiently than the paper ledger. You can 4. It is also possible to automatically monitor the occurrence of a fault in the optical fiber cable and automatically manage the core wire.

The sewer optical network system according to claim 2 of the present application monitors desired information, such as measurement information, cable information, map information of sewer facilities and various information collectively managed, on the map as graphic information. Since it can be displayed, the following effects are available in addition to the above effects. That is,
You can quickly and accurately grasp the obstacle point on the map,
In addition, the abnormal situation can be confirmed on the screen, so the time until the accident recovery is shortened.

In the sewer optical network system according to claim 3 of the present application, the optical fiber cable is provided with loss generating means or reflected light generating means (measuring marker), and the position up to the loss generating means or reflected light generating means is measured. Then, the difference between the measured length (actual length) and the distance to the point on the map (design length) is corrected, and the database is automatically updated with the corrected data. Besides, there are the following effects. 1. The periodical inspection of the optical fiber cable can be performed only by searching and confirming the monitoring information of the optical fiber cable 6. For this reason, it is necessary to perform regular measurement as in the past, and to check the optical fiber cable one by one at each measurement, measure the confirmed optical fiber cable, and collate the measured data obtained with the conventional measurement data. There is no need to do troublesome work such as. 2. Since there is no error between the measured length (actual length) and the distance on the map (design length), the position of the accident point such as an accident or disconnection of the optical fiber cable can be accurately grasped.

In the sewer optical network system according to claim 4 of the present application, a sensor for sewer line-of-sight management which incorporates a loss generating means or a reflected light generating means into a bending of an optical fiber cable, an axis deviation, and a fiber grating (FBG), Fiber connection box, branch box, termination box, etc.
The measurement marker can be easily provided on the optical fiber cable without special equipment or device modification or system design change.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a sewer optical network system of the present invention.

FIG. 2A is an explanatory sectional view showing an example of a tape fiber in an optical fiber cable used in a sewer optical network system, and FIG. 2B is an explanatory sectional view showing an example of an optical fiber cable.

FIG. 3 is a block diagram of data management in the sewer optical network system of the present invention.

4A to 4F are explanatory diagrams showing a monitor configuration of a terminal device of the information management device during the operation of the faulty cable automatic monitoring function.

[Explanation of symbols]

1 Monitoring device 2 Information management device 3 Optical pulse tester 4 Optical fiber selector

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Saito             2-6-2 Otemachi, Chiyoda-ku, Tokyo East             Kyoto Sewer Service Co., Ltd. (72) Inventor Tetsuhiro Yamashita             2-6-1, Marunouchi, Chiyoda-ku, Tokyo             Kawa Electric Industry Co., Ltd. F term (reference) 2H038 AA03 AA21 CA38 CA68                 5K002 BA06 BA21 EA06 EA33 FA01                 5K042 AA01 AA08 CA10 DA33 EA01                       HA02 JA01 LA01

Claims (4)

[Claims] [Claim 1] Cable information on specifications, wiring, connections, etc. of optical fiber cables laid in a sewerage facility, and map information of the sewerage facility such as a sewer pipe piping route, manhole installation location, sewage treatment plant location, etc. And in the sewer optical network system for detecting abnormalities in sewer facilities, periodic inspections, etc. by a computer based on various information, measurement information obtained by measuring an optical fiber cable is measured by the computer by the computer. A sewer optical network system characterized by being able to collectively manage various information. 2. The sewer optical network system according to claim 1, wherein desired information, out of measurement information, cable information, map information of sewer facilities and various information managed collectively, is displayed on a map as graphic information on a monitor. Sewer optical network system characterized by making it possible. 3. The sewer optical network system according to claim 1 or 2, wherein a marker for measurement is provided at a position corresponding to a predetermined position on the map in the optical fiber cable, and the marker is used as a loss generating means or a reflection means. As the light generating means, measuring light is input to the optical fiber cable to measure the position to the loss generating means or the reflected light generating means, and the measured length (actual length) and the distance to the position corresponding to the marker on the map. A sewer optical network system characterized by correcting the difference with the (designed length) and automatically updating the corrected data in the database. 4. The sewer optical network system according to claim 3, wherein the loss generating means or the reflected light generating means incorporates bending of the optical fiber cable, axial misalignment, and a fiber grating (FBG) for sewer line-of-sight management, fiber connection. A sewer optical network system characterized by being a box, branch box, termination box, etc.