JP2019186624A - Optical line route design support system - Google Patents

Abstract

To provide an optical line route design support system capable of designing an optical line route to a subscriber's home, in a shorter time.SOLUTION: An optical line route design support system of the present invention includes an installed state database and route extraction means for extracting an optical line route, and the installed state database includes data of a plurality of installed optical cables and the data of the line usage state for an optical fiber core line accommodated in an optical cable. The route extraction means performs an optical cable route extraction process for extracting an optical cable route consisting of a combination of optical cables from the start point to the end point and an optical line route extraction process for extracting an optical line route consisting of a combination of optical fiber core line from the start point to the end point only with an optical fiber core line satisfying a predetermined condition, using an optical fiber core line that is accommodated in the optical cable of the extracted optical cable route as a target. A predetermined condition includes a first condition in which the line usage state for the optical fiber core line is an unavailable state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical line route design support system.

  Conventionally, when an optical fiber core wire is already connected in a closure, the connected two optical fiber core wires are treated as a single path, and connection work is performed by the Dijkstra method with a route search condition that uses the shortest distance. An optical fiber route design support apparatus in an optical cable network with a small load is known (see Patent Document 1).

JP 2011-254221 A

  By the way, the installation of optical cables has expanded every time a subscriber who joins the optical communication network appears, such as newly laying in areas where optical cables are not installed. Is laid and an optical cable network is constructed.

  And when laying an optical cable for a new subscriber, an optical cable having an excess optical fiber core wire is laid in anticipation of a future subscriber.

  For this reason, the optical fiber core line accommodated in the optical cable includes an active line (active optical fiber core line) assigned to the subscriber and an empty line (empty optical fiber core line) that can be assigned to a new subscriber. , Management is done separately.

  Then, when a new subscriber appears in the optical cable network, an optical fiber core wire that has already been laid out of the optical fiber core wires in the optical cable that has already been laid, without laying a new optical cable, Work to allocate to new subscribers will be implemented.

  For this purpose, an optical line route composed of an empty line is obtained from the base station or the like to the new subscriber, and the line opening work is performed.

  Here, the Dijkstra method is an algorithm whose basic concept traces all branches and leaves that branch at a branch point sequentially from a starting point that serves as a search start point.

  For this reason, for example, if there are two branches at the first branch point and two branches at each branch destination, a route search by Dijkstra method will result in each of 2 branches × 2 branches = 4 branches. The route will be extracted.

  However, since many optical fiber core wires are accommodated in the optical cable, when the Dijkstra method is applied to the optical fiber core wires as in Patent Document 1, each optical fiber core wire is used as a search start point a number of times. Now, and the optical cable network itself is stretched around like a network, there are innumerable branches and leaves even if only one optical fiber core line is used as the search start point. It becomes a search like this.

  For this reason, when the Dijkstra method is applied to an optical fiber core line as in Patent Document 1, for example, an optical line route composed of an empty line from a base station to the new subscriber is obtained. There is a problem that it takes time.

  The present invention has been made in view of such circumstances, and provides an optical line route design support system capable of obtaining (designing) an optical line route to a subscriber's house in a shorter time, for example. For the purpose.

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) An optical line route design support system of the present invention is an optical line route design support system that supports optical line route design. The optical line route design support system includes an installed state database and an installed state database. And a route extraction means for extracting an optical line route from the starting point to the end point, and the laying state database includes data of a plurality of laid optical cables and optical fiber cores accommodated in the optical cables. And the route extraction means is extracted by an optical cable route extraction process for extracting an optical cable route comprising a combination of the optical cables from the start point to the end point, and the optical cable route extraction process. The optical fiber accommodated in the optical cable of the optical cable route. An optical line route extraction process for extracting the optical line route consisting of a combination of the optical fiber core lines from the start point to the end point only with the optical fiber core line satisfying a predetermined condition for a target core line, and The predetermined condition includes a first condition that is the optical fiber core wire in which a line usage status is empty.

(2) In the configuration of (1), the optical cable route extraction processing includes the optical cable route in which the number of the optical cables included in the optical cable route is equal to or less than the preset number of optical cables and does not include the same optical cable a plurality of times. This is a process of extracting all.

(3) In the configuration of (1) or (2), the predetermined condition is that the optical fiber core wires satisfying the first condition in the same optical cable have more than the required number of lines. The second condition, which is an optical fiber core wire, is included.

(4) In the configuration of any one of (1) to (3), the predetermined condition is that the optical fiber core wire in which the line usage status is empty among the optical fiber core wires accommodated in the optical cable. A third condition that is the optical fiber core housed in the optical cable that is equal to or greater than a set ratio.

(5) In the configuration of any one of (1) to (4), the optical line route design support system can display one or more optical line routes extracted by the optical line route extraction process. And an operation unit capable of selecting one of the one or more optical line routes displayed on the display unit, wherein the laying state database is a connection status between the optical fiber cores. When one optical line route is selected from one or more of the optical line routes displayed on the display unit by the operation unit, the data in the optical line route selected on the display unit is selected. Along with a display in which optical fiber core wires are arranged in order from the starting point to the end point, the presence or absence of connection between the displayed optical fiber core wires is displayed.

  According to the present invention, it is possible to provide an optical line route design support system capable of obtaining (designing) an optical line route to a subscriber's house in a shorter time.

It is the schematic for demonstrating the structure of the optical line route design support system which supports the optical line route design of embodiment which concerns on this invention. It is the schematic for demonstrating the cable route information data file of embodiment which concerns on this invention. It is the schematic for demonstrating the core wire path | route information data file and connection point information data file of embodiment which concerns on this invention. It is the schematic for demonstrating the connection point loss information data file and cable loss information data file of embodiment which concerns on this invention. It is a figure which shows the place which displayed on the display part the screen which inputs the search conditions of the optical line route design assistance system of embodiment which concerns on this invention. It is a flowchart of the route search for the optical circuit route design of embodiment which concerns on this invention. It is a figure which shows the place which displayed the result display screen which displays the result (empty route search result) of the optical line route design of the optical line route design assistance system of embodiment which concerns on this invention on a display part.

DESCRIPTION OF EMBODIMENTS Hereinafter, a mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described in detail with reference to the accompanying drawings.
In addition, the same number or code | symbol is attached | subjected to the same element throughout the description of embodiment.

FIG. 1 is a schematic diagram for explaining the configuration of an optical line route design support system 1 that supports optical line route design according to an embodiment of the present invention.
As shown in FIG. 1, an optical line route design support system 1 includes a system server 10 serving as a main body of the optical line route design support system 1, and a display unit 11 of the optical line route design support system 1 connected to the system server 10. And a keyboard and a mouse connected to the system server 10 and serving as the operation unit 12 of the optical line route design support system 1.

  In the present embodiment, only the system server 10 is shown as a computer. However, a personal computer or notebook PC connected to the system server 10 via the network and operating the optical line route design support system 1 is provided. It may be.

  In recent years, since the processing capability of a personal computer has been improved, the system server 10 may be a personal computer as long as it constitutes a main body capable of realizing the functions described below.

  The system server 10 includes a storage unit composed of a ROM and a RAM, and an instruction of a program for realizing the operation as the optical line route design support system 1 stored in the storage unit. And a control unit configured by a CPU or the like that performs overall control.

  As described above, when providing a personal computer or notebook PC connected to the system server 10 via the network and operating the optical line route design support system 1, the system server 10 is connected to the personal computer or notebook PC. A communication unit for communicating between the two will be provided.

The system server 10 also stores the laying state database shown in FIG. 1 in the storage unit.
However, the laying state database may be stored in an external storage device provided separately from the system server 10, and the external storage device and the system server 10 may be communicably connected to exchange data. .

  The control unit of the system server 10 functions as various means for operation of the optical line route design support system 1 described later.

On the other hand, the laying state database includes data relating to a plurality of laid optical cables (a plurality of laid optical tape cores and a plurality of laid optical fiber cores). As shown in FIG. , Cable route information data file, core wire route information data file, connection point information data file, connection point loss information data file, and cable loss information data file.
However, it is needless to say that even if it is not stored in such a file format, it may be in a data storage format that allows optical line route design.

  The details of each data file (cable route information data file, core wire route information data file, connection point information data file, connection point loss information data file, and cable loss information data file) will be described later. Each time it is laid, information about the new optical cable is sent from the contractor or the telecommunications carrier that requested the construction. Based on this information, each data file is updated to add information about the new optical cable. .

  However, as will be described later, the connection point loss information data file and the cable loss information data file may not need to be updated due to the addition of a new optical cable. It does not happen.

  In addition, each data file does not have a new optical cable installed as described above, but the contents to be changed when the optical line is opened for a new subscriber from the installed optical cable is not Or, since it is sent from the telecommunications carrier who requested the construction, it is updated based on that to change the part that needs to be changed.

Next, the structure of each data file will be described with reference to FIGS.
FIG. 2 is a schematic diagram for explaining the cable route information data file. The upper part schematically shows the optical cable network, and the lower part shows the structure of the cable route information data file.

In the schematic diagram of the optical cable network shown in the upper part, a place where a station or a device such as a closure is present is indicated by a square frame, and alphabets A to G are described for distinguishing these devices.
In addition, optical cables connecting the devices are indicated by lines, and alphabets j, k, m, n, p, r, s, and t are described in order to distinguish the optical cables.

  For example, an optical cable j is laid between the devices A and B so as to connect the devices A and B, and an optical cable m is connected between the devices B and D so that the devices B and D are connected. The optical cable network is shown schematically, for example, such as

  And as you can see from the cable route information data file shown in the lower row, the items are as follows: start device, end device, cable ID, cable length, cable core number, tape core number, empty core number, empty tape number, empty It has items such as core ratio and cable type.

  Specifically, in the content of the next line (the next lower line) of the item, when the device A is the start point and the device B is the end point, the device A and the device B are between the device A and the device B. An optical cable j whose cable ID is j is provided so as to connect the two.

  It is continuously shown that the length of the optical cable j is 50 m, and the number of optical fiber cores accommodated in the optical cable j is 100 cores.

  Further, the optical cable j is shown to contain the optical fiber core wire in the form of an optical tape core wire in which the four-core optical fiber core wires are combined, and then the optical fiber accommodated in the optical cable j. Of the core wires, 60 cores are shown as empty lines.

  In other words, when viewed as an optical tape core, the optical cable j is an optical cable that accommodates 25 optical tape cores, and when viewed with individual optical fiber cores, the current 60-core optical fiber is an empty line. On the contrary, it can be seen that 40 cores are working lines.

  Furthermore, the number of optical tape core wires in which all of the four optical fiber core wires of the optical tape core wire are empty lines is shown as the number of empty tapes. In the case of this example, the 25 optical tapes described above are shown. Of the core wires, it is shown that all of the four-core optical fiber core wires are vacant lines.

  In this case, the number of empty tapes × the number of optical fiber cores of the optical tape core line is 13 × 4 = 52, which does not coincide with 60 of the number of empty cores. This is because all of the numbers indicate the number of optical tape core wires that are vacant lines.

  In other words, for example, the eight optical tape core wires are all the four-core optical fiber core wires, and the four optical tape core wires are each two of the four-core optical fiber core wires. Only the working line, the remaining two optical fiber cores are in an empty line, and the remaining 13 optical tape cores are all four optical fiber cores empty. Since it is a situation like a line, all optical fiber core wires are 13 when viewed from an optical tape core wire that is an empty line.

  Furthermore, the cable type is shown following the empty core ratio indicating how many of the optical fiber core wires accommodated in the optical cable j are empty lines.

  The cable type includes, for example, the identification of the manufacturer of the optical fiber core housed in the optical cable, and the type of the optical fiber core wire (for example, ITU-T G.652.D compliant single mode fiber or ITU- This is a type assigned to distinguish itself (type of non-zero dispersion-shifted fiber, etc. conforming to TG655), mainly because it is the latter, and transmission loss changes depending on this type.

  On the other hand, in this embodiment, as can be seen from the second line from the cable route information data file item shown in the lower row, the relationship between the start device and the end device is just the opposite. Other items have the same line.

  By having data that reverses the relationship between the devices at the start and end points in this way, the program does not have to be a program that can be searched in the reverse direction, so the program can be simplified. This will become clear in the following description with reference to FIG.

FIG. 3 is a schematic diagram for explaining the core line route information data file and the connection point information data file.
3 schematically shows only the portion of the optical cable network between the devices A, B, and D in FIG. 2, the middle portion shows the structure of the core route information data file, and the lower portion shows connection point information data. Shows the structure of the file.

  Also, in FIG. 3, in the schematic diagram showing the upper optical cable network, the optical cable portion is schematically shown in a horizontal cylindrical shape, one optical tape core wire in the optical cable is shown in a parallelogram shape, and the optical fiber core wire is shown. It is indicated by a line, a portion to be a connection point is indicated by a round shape, and a device such as a station or a closure is indicated by a vertically long rectangle.

  However, since there is no space for illustrating all the optical fiber core wires, for the second and subsequent optical fiber core wires, the four cores are collectively omitted as a horizontally long dotted rectangular shape, and those dotted rectangular shapes are connected. The illustration of points is also omitted.

  As shown in FIG. 3, the core path information data file includes items such as start point connection point ID, end point connection point ID, core line ID, wire number, tape number, cable ID, working / non-working flag, and tracking direction. Have items.

  First, the cable ID is the same as the cable ID described with reference to FIG. 2, and j is assigned as the cable ID to the optical fiber core wire (optical tape core wire) accommodated in the optical cable j.

The core wire ID is an ID given to each optical fiber core wire, and the tape number is a number given to each optical tape core wire.
The wire number indicates only the numeric part of the core wire ID.

For example, as described above, there are 25 optical tape core wires housed in the optical cable j, and in the upper schematic diagram, these optical tape core wires are denoted by jt1 to jt25.
Each optical tape core wire has a four-core optical fiber core wire, and therefore, a core wire ID for distinguishing the optical fiber core wire is given to each optical tape core wire.

  Specifically, as shown in the middle-stage core wire path information data file, the optical tape core wire jt1 is given a tape number 1, and each optical fiber core wire of the optical tape core wire jt1 has a core wire ID jf1. , Jf2, jf3, and jf4.

Although the optical tape core wire after the optical tape core line jt2 is not shown in the middle stage core path information data file, for example, for the optical tape core line jt2, the tape number 2 is given and the optical tape core line is also shown. jf5, jf6, jf7, and jf8 are given to the optical fiber core wires of jt2 as core wire IDs, respectively.
Note that the optical fiber core wires jt2 have optical fiber core wires having numbers 5, 6, 7, and 8, respectively, because they are only the numeric part of the core wire ID as described above.

  The working / non-working flag is a flag indicating whether the working line is used as the working line described above or can be assigned to a new subscriber with a free line, as shown in the middle-stage core route information data file. A working / non-working flag is provided for each optical fiber core wire.

  For example, it can be seen that an optical fiber core line with a core line ID jf1 is used as an active line because the working / non-working flag is 1, and conversely, an optical fiber core line with a core line ID jf3 is used as a working line. Since the non-working flag is 0, it can be seen that the line is free and can be assigned to a new subscriber.

  Further, the start point connection point ID and the end point connection point ID are IDs indicating in which device each optical fiber core wire is connected, and the tracking direction indicates the directionality of the start point and the end point.

  Specifically, the optical fiber core line jf1 whose tracking direction is 1 is an optical fiber core line extending from the device A toward the device B, and the start point is the start point in connection point management in the device A. An optical fiber core wire connected at a connection point having a connection point ID A1, and an optical fiber core wire connected at a connection point having an end point connection point ID B1 in connection point management in the device B.

In addition, as shown in the schematic diagram in the upper part of FIG. 3, there is a pre-connection state such as an optical tape core line jt2.
For example, if the optical tape core line jt2 is connected to another optical tape core line (not shown) in the device A and not connected to another optical tape core wire in the device B, the starting point is set to the device A side. The start point connection point ID is assigned, but the end point connection point ID when the end point is the device B is assigned a blank or a number indicating no connection.

  In the case of the optical tape core line jt2, the optical tape core line is spoken so that it can be easily compared with the schematic diagram in the upper stage, but the start point connection point ID and the end point connection point ID are understood as seen from the core line path information data file. Is given for each optical fiber core line, correctly, it is more accurately explained that a blank or a number indicating no connection is given when there is no connection to each optical fiber core line.

  In this embodiment, since the cases of the tracking direction 1 and 2 are provided, the description will be made with reference to the previous optical tape core line jt2 (more precisely, the optical fiber core line of the optical fiber core line jt2). As for the start point connection point ID when the device B is set as the device B side, a blank or an unconnected number is assigned, and the end point connection point ID is set when the end point is set as the device A side.

  Of course, there are cases where both ends of the optical tape core wire (more precisely, the respective optical fiber core wires of the optical tape core wire) are not connected. In this case, the tracking directions are 1 and 2 respectively. In either case, a blank or a number indicating no connection is assigned to the start point connection point ID and the end point connection point ID.

  In addition, there are cases where there are some of the four-core optical fiber core wires of the optical tape core wire that have been connected and those that have not been connected. In this case as well, the start point connection point ID and the end point connection point The ID is the same as described above. In the case of an optical fiber core wire that is not connected, a blank or an unconnected number is assigned. In the case of an optical fiber core wire that is connected, an ID is assigned. .

  Even if the optical fiber core line is not connected and the start point connection point ID and end point connection point ID are not given, the cable ID is given to the core line route information data file. It can be determined by referring to the cable route information data file which optical fiber core wire (optical tape core wire) is between which devices.

In the upper schematic diagram of FIG. 3, the optical fiber core line connected to the optical fiber core line jf1 is not drawn when the start point connection point ID is A1, but the connection point of the connection point information data file shown in the lower stage. Since the connection type of the connection status corresponding to the place where the ID is A1 is 1, it indicates that the fusion connection has already been completed.
Similarly, when the connection type is 2, it indicates that the connection is made with a mechanical splice.

  Since the connection type representing the connection status can be said to indicate the connection status of each optical fiber core wire of the optical tape core wire to which the connection is made, it also represents the connection status of the optical tape core wire.

  In the core line path information data file, the tracking direction is 1 for the optical fiber core wire having the same core ID (when the direction from the device A to the device B) is 2, and when the tracking direction is 2 (from the device B to the device A). And the starting point connection point ID and the end point connection point ID are merely reversed, as can be seen by comparing these two.

  This is also the same as that described in the cable route information data file earlier. By having data that reverses the relationship between the start point and the end point in this way, it is not possible to make the program capable of backward search by the program. Therefore, simplification of the program can be realized.

  On the other hand, in the core line route information data file in the middle stage, the optical tape core wire and the optical fiber core wire that the optical cable m has are not shown. Of course, the core line route information data file also includes the start point connection point ID, the end point, and so on. It has data on items such as connection point ID, core wire ID, wire number, tape number, cable ID, working / non-working flag, and tracking direction.

  For example, since the optical tape core wire mt1 also has four optical fiber core wires, mf1 (wire number 1), mf2 (wire number 2), mf3 (wire number 3) are used as the core wire IDs for the respective optical fiber core wires. ) And mf4 (wire number 4).

  Further, for the four-core optical fiber core wires of the optical tape core wire mt1, 1 is given as the tape number, and m is given as the cable ID.

  Naturally, corresponding to the case of the tracking direction 1 (when moving from the device B to the device D), for example, the optical fiber core wire mf1 includes data having a start point connection point ID B1 and an end point connection point ID D1. Corresponding to the case where the tracking direction is 2 (from the device D to the device B), there is data having a start point connection point ID D1 and an end point connection point ID B1, and each optical fiber core wire On the other hand, working / non-working flags are also given.

  As shown in FIG. 2, the optical cable m is an optical cable having 200 optical fiber core wires (50 optical tape core wires). Therefore, as shown in FIG. There are 100 core wires. For example, when a new optical cable is laid from the device B to another area, if it is up to 100 cores, the optical cable is not added to the device D side. It is possible to secure a route to head.

  Next, the connection point loss information data file and the cable loss information data file will be described with reference to FIG. 4 which is a schematic diagram for explaining the connection point loss information data file and the cable loss information data file. .

The connection point loss information data file is a file having connection loss data corresponding to the connection type of the connection point information data file mentioned earlier.
For example, when the connection type is 1, it has been described that the fusion connection has been completed. However, in the case of the fusion connection, a connection loss of about 0.2 dB occurs, so the connection point loss information data file is connected. Type 1 is given a connection loss (dB) of 0.2 dB.

  Similarly, when the connection type is 2, it has been described that the connection is made by the mechanical splice. However, in this case, the loss is higher than the fusion connection, which is about 0.4 dB. Type 2 is given a connection loss (dB) of 0.4 dB.

On the other hand, when the connection type of the connection point loss information data file is 0, 0 dB is given as the connection loss.
Although this is regarded as a connection point, it is a connection type given to a location where no connection is actually made.

  For example, when there is a subscriber in the middle of one optical cable instead of a connection portion between the optical cables, the optical fiber core wire may be dropped from the midway location to the subscriber's home.

  Also in this case, the optical fiber core cannot be dropped unless the cable covering of the optical cable in a range where the optical fiber core can be taken out is removed.

  However, unless the cable sheath is removed separately, the optical tape core and optical fiber core will deteriorate under the influence of ultraviolet rays, rain and wind, etc. (Closure) is installed.

  However, in this case, it is only necessary to have optical fiber core wires (for example, a total of two cables, that is, upstream and downstream) for dropping at the subscriber's home, so one optical tape core wire is cut and two of them are cut. Will only use.

  In addition, remove only the area necessary for stripping the tape coating of one optical tape core wire to the optical fiber core wire, cut only the two core wires, and secure the necessary two lines without cutting the remaining two core wires. In some cases, it is dropped at the subscriber's home.

  Therefore, in such a location, except for the optical tape core wire (or optical fiber core wire) to be cut, the device (closure) is simply passed through without being cut.

  However, since it is also a place where equipment (closure) is provided, it is also a place that is easy to use as a point to connect a drop or another optical cable. Since no connection is made, no connection loss has occurred, so the connection loss is handled as 0 dB.

Note that the connection type 3 corresponds to a case where optical fiber core wires that are likely to cause connection loss are connected by a mechanical splice.
For example, when one is a single mode fiber and the other is a non-zero dispersion shifted fiber, the MFD (mode field diameter) does not match, and connection loss is likely to occur.

However, the connection type need not be limited to 0 to 3, and may be further increased. On the other hand, even if a new optical cable is laid, it is necessary to increase if the already prepared connection type is sufficient. Absent.
Therefore, as mentioned earlier, the connection point loss information data file is not necessarily updated just because a new optical cable is laid.

Next, the cable loss information data file is a file having transmission loss data corresponding to the cable type mentioned earlier.
For example, since the transmission loss of the non-zero dispersion shifted fiber is higher than the case where the optical fiber core line accommodated in the optical cable is a single mode fiber, the cable depends on the type of the optical fiber core line accommodated. In many cases, a type is given and a transmission loss (dB / m) is set.

  However, even if the optical fiber cores to be accommodated comply with the same standard, some manufacturers tend to increase the cable loss that occurs when making cables. There is a case where a cable type is given to a certain optical cable and a transmission loss value corresponding to that is set.

In addition, if the cable loss information data file must be newly set, the number of types will be increased. However, even if a new optical cable is laid, if the already prepared cable type is sufficient. No need to increase.
For this reason, as mentioned earlier, the cable loss information data file is not necessarily updated just because a new optical cable is installed.

  The description of the main contents of the laying state database has been completed, and in the following, specifically, how the optical line route is designed using the optical line route design support system 1 will be described. To do.

  FIG. 5 is a diagram showing a state where the input screen 20 for inputting the search conditions of the optical line route design support system 1 is displayed on the display unit 11.

The input screen 20 includes a start point input unit 21 that inputs a position that is a start point, and an end point input unit 22 that inputs a position that is an end point.
The start point input unit 21 and the end point input unit 22 may be input in an input form (address, building name, etc.) that can specify a place on a map such as a so-called road map. Since devices etc. are also recorded as position data on the map, when the input that can specify the location on the map is made to the start point input unit 21 and the end point input unit 22, the nearest device close to the position is set. It has become so.

  It should be noted that the optical fiber core wire is drawn from the nearest device to a subscriber's house or the like to be opened using a drop cable or the like.

  The input screen 20 is also provided with an elapsed point input unit 23 for inputting a position to be an elapsed point (also referred to as a via point), so that there is an area or the like that is desired to be routed as an optical line route to be designed. Then, input that can identify the place on the map may be performed.

On the other hand, the input screen 20 includes a unit selection unit 24 provided with a radio button for selecting whether a search unit is an optical tape core wire (tape unit) or an optical fiber core wire (core wire unit).
In the following, the case where the selection of the radio button is set to the optical fiber core wire (core wire unit) as shown in FIG. 5 will be described.

  The input screen 20 has a line number input unit 25 for inputting the number of lines necessary for the optical line route, and inputs the necessary number of lines there.

  In this way, after inputting the search condition, when the search start icon 26 (search for empty route) for starting the search for the empty route (optical line route) is pressed, the search is started.

For example, a case will be specifically described where the nearest device for the start of the optical line route search this time is the device A shown in FIG.
In this description, it is assumed that no elapsed point is input.

FIG. 6 is a flowchart of route search for designing an optical line route.
As described above, when the search start icon 26 (empty route search) is pressed, the route search according to the flowchart of FIG. 6 is started (start of FIG. 6), and the optical line route is designed.

(Step S1)
First, the control unit of the system server 10 functions as a route extraction unit that extracts an optical line route from the start point to the end point based on the installed state database. First, an optical cable composed of a combination of optical cables from the start point to the end point Performs optical cable route extraction processing to extract routes.

  Specifically, in this embodiment, the Dijkstra method is used for route search, and the Dijkstra method sequentially starts from the starting point (device A in this example) as the search start point, as mentioned earlier. It is an algorithm that follows

  However, in this algorithm, since there is a possibility of falling into an infinite loop, it is necessary to add some interruption condition.In this embodiment, the number of optical cables included in the optical cable route is equal to or less than the preset number of optical cables and the same optical cable is used. The processing is to extract all optical cable routes that are not included multiple times.

  Specifically, since the starting point is the device A, the route extraction unit searches for the end device of the data that is the start device A from the cable route information data file shown in FIG. A cable (cable ID) for reaching the end device is extracted from the optical cable data and recorded, and the end device is recorded.

  The cable route information data file shown in FIG. 2 does not show all the data parts, but covers the optical cable network schematically shown in the upper stage. The branches and leaves that reach the end device B via the optical cable k and the branches and leaves that reach the end device C via the optical cable k are discovered and recorded first.

  Subsequently, the route extraction unit similarly searches for the end device in the cable route information data file when the start device is the device B and when the start device is the device C.

  For example, if the start device is device B, device D and device A will be found as end devices, but in this embodiment, an abort is performed to extract an optical cable route that does not include the same optical cable multiple times. The condition is that the same device does not appear multiple times.

  For this reason, the search to the device A is terminated there, and when the device at the start point is the device B, from the data of the optical cable in the cable route information data file to the terminal device D that is a device that cannot be terminated due to the termination condition. The cable (cable ID) to reach is extracted and the end device is recorded.

  That is, only the branches and leaves that reach the end device D via the optical cable m survive as the next search target.

  Similarly, when the starting device is the device C, the devices A, D, and E are found as the end devices, but the device A reaches the device D via the optical cable n because the device A is a target to be aborted. The branches and leaves and the branches and leaves that reach the device E via the optical cable p survive as the next search target.

  In this way, when an end device that is not terminated due to the termination condition is sequentially found and the search is continued using the end device as the next start device, in the case of FIG. 2, three optical cable routes are extracted. It will be.

  Specifically, an optical cable route from the device A via the optical cable j, from the device B via the optical cable m, from the device D to the device G via the optical cable t (hereinafter also referred to as a first optical cable route). An optical cable route from the device A via the optical cable k to the device G from the device C via the optical cable n to the device G via the optical cable t (hereinafter also referred to as a second optical cable route) and from the device A. An optical cable route from the device C to the device G via the optical cable k, from the device E to the optical cable s, from the device F to the optical cable r, from the device F to the optical cable t (hereinafter referred to as the optical cable t). , Also referred to as a third optical cable route).

Note that FIG. 2 is merely a schematic illustration of an optical cable network, which is extremely simple. However, an actual optical cable network is stretched around the country like a mesh.
For this reason, as described above, if we imposed the condition that the same device does not appear multiple times, we are searching for a route from Chiba to Tokyo, but we are going to Niigata from Chiba to Tohoku, Hokkaido, etc. Routes that lead to Tokyo via, etc., and further from Niigata etc. in the direction of Yamaguchi, Kyushu, etc., and routes to Tokyo via Hiroshima, Okayama, Osaka, Nagoya, etc. will also be searched. .

  However, even if such a significantly detoured route is found, the probability of being adopted as an optical line route is very low. Therefore, in this embodiment, a truncation condition for an optical cable route equal to or less than the preset number of optical cables is added. Yes.

  Specifically, as the termination condition, when the number of optical cables directly exceeds the set number of optical cables (for example, when the number exceeds 20), or the number of passing devices exceeds the set number of optical cables + 1. In that case, the route search is aborted.

  However, the route search may be aborted when the total length of the optical cables required one after another in the route search exceeds a predetermined length (for example, 20 km). Both the number and the length of the optical cables may be used. May be imposed as a censoring condition.

  In the case of the present embodiment, as a result of the optical cable route extraction process, the optical cable routes targeted for the optical line route design are narrowed down to three. Next, the route extraction means is extracted by the optical cable route extraction process. For an optical fiber core line accommodated in the optical cable of the optical cable route, an optical line route consisting of a combination of optical fiber core lines from the start point to the end point is extracted only from the optical fiber core lines satisfying a predetermined condition.

(Step S2)
In this example, since three optical cable routes are extracted, in step S2, a combination of optical fiber core wires from the start point to the end point is obtained for each optical cable route by using only the optical fiber core wires satisfying predetermined conditions individually. However, since the contents performed for each optical cable route are the same, here, the first optical cable route will be described as a main example. .

  First, one of the predetermined conditions (hereinafter also referred to as a first condition) is whether or not an optical line route can be designed using only an optical fiber core line in which the line usage is all empty.

For this purpose, the route extraction means, for each of the optical cables (optical cable j, optical cable m, and optical cable t) existing on the first optical cable route, the optical fiber core data recorded in the cable route information data file (free space). On the basis of the number of cores), it is determined whether there is an optical fiber core wire whose line usage status is empty.
The number of empty cores is data that can be used to understand the overall line use status of each optical fiber core housed in the optical cable, and the data on the line use situation of each of the optical fiber core wires housed in the optical cable. It is an example.

  This determination can also be made based on optical fiber core data (cable ID, working / non-working flag, etc.) recorded in the core route information data file. It is another example of the data of a line use condition about each of the optical fiber core line accommodated in the inside.

For example, referring to the cable route information data file for the optical cable j, since there are 60 free cores, the route extraction means determines that there is an optical fiber core wire with a free line usage status for the optical cable j.
Note that, for example, the route extraction means may include a case where 0 is assigned to the working / non-working flag based on the working / non-working flag in which j is assigned to the cable ID of the core route information data file. As for the optical cable j, it may be determined that there is an optical fiber core wire in which the line usage status is empty.

  Similarly, since the optical cable m also has 100 free cores, the route extraction means determines that there is also an optical fiber core wire with a free line usage status for the optical cable m.

  Further, although not shown in FIG. 2, if there is a description of the number of free cores for the optical cable t, the route extracting means determines that there is an optical fiber core wire for which the line usage status is also empty for the optical cable t.

  Then, when the route extraction means determines that there is an optical fiber core that has an unused line usage status for all optical cables existing on the optical cable route, only the optical fiber core that satisfies the first condition from the first optical cable route is used. Then, an optical line route extraction process for extracting an optical line route composed of a combination of optical fiber core lines from the start point (device A) to the end point (device G) is executed.

  On the other hand, for example, when any one of the optical cable j, the optical cable m, or the optical cable t has an empty core number of 0, only an optical fiber core wire that satisfies the first condition (an optical fiber core wire whose line usage is empty) is used. It is not possible to extract an optical line route composed of a combination of optical fiber core wires from the starting point (device A) to the ending point (device G).

  For this reason, when it is determined that one of the optical cables j, optical cable m, or optical cable t has zero free cores, the route extraction unit determines the optical line route for the first optical cable route. The extraction process of the extracted optical line route is not executed.

  Although the detailed description is omitted, similarly, the route extraction unit performs the same determination as the determination made on the first optical cable route also on the second optical cable route (third optical cable route), and determines the determination. As a result, when it is determined that all of the optical cables existing on the second optical cable route (third optical cable route) have an optical fiber core wire in which the line usage status is empty, with respect to the second optical cable route (third optical cable route) Also, the optical line route extraction process is executed, otherwise the optical line route extraction process is not executed.

  In the present embodiment, in executing the optical line route extraction process, the second condition is included as the predetermined condition in addition to the first condition, and specifically, the first condition is included in the same optical cable. Starting from a combination of optical fiber cores satisfying the second condition, which is an optical fiber core wire in an optical cable in which optical fiber core wires satisfying the conditions (optical fiber core wires in which the circuit usage is vacant) exist more than the required number of lines ( The optical line route from the device A) to the end point (device G) is extracted.

  For this reason, in this embodiment, when it is determined that all of the optical cable j, the optical cable m, and the optical cable t have optical fiber core wires in which the line usage status is empty, the route extraction unit is recorded in the cable route information data file. It is also determined whether the number of optical fiber core wires that satisfy the first condition (the optical fiber core wire whose line usage is empty) is equal to or greater than the required number of lines based on the data (number of empty cores) It is carried out.

  That is, in this embodiment, the case where two lines are secured for uplink and downlink has been described, and the route extraction unit performs the optical cable (optical cable j, optical cable m) for each of the optical cable j, the optical cable m, and the optical cable t. It is also determined whether or not the optical cable t) has two or more optical fiber core wires that satisfy the first condition (optical fiber core wire whose line usage is empty).

  Specifically, the route extraction means determines whether or not the data on the number of empty cores of the optical fiber core wire recorded in the cable route information data file for each of the optical cable j, the optical cable m, and the optical cable t is two or more. When the determination is made and it is determined that there are two or more optical fiber core wires that have an empty line usage status for all the optical cables existing on the optical cable route, the light that satisfies the first condition and the second condition from the first optical cable route An optical line route extraction process for extracting an optical line route composed of a combination of optical fiber core lines from the starting point (apparatus A) to the end point (apparatus G) is executed using only the fiber core line.

  The determination of whether or not the data of the number of vacant cores of the optical fiber core wire is two or more for each of the optical cable j, the optical cable m, and the optical cable t performed by the route extraction unit is recorded in the core route information data file. It is also possible to carry out based on data of the existing optical tape core wire (cable ID, working / non-working flag, etc.).

  However, it is not always necessary to impose the second condition. If only the first condition is imposed, the first condition (the optical fiber core wire in which the line usage status is vacant) is assumed in the optical cable existing on the optical cable route. ) Even if there is an optical cable that has only one optical fiber core wire that satisfies the above), an optical line route for one line can be designed with the optical cable route, and an optical line route for another line that is insufficient from the remaining optical cable route is designed. By doing so, optical line routes for a total of two lines can be secured.

For example, although it seems to be an extremely rare example, any of the extracted optical cable routes is an optical cable having only one optical fiber core wire that satisfies the first condition (an optical fiber core wire whose line usage is empty). In such a case, if the second condition is imposed, the optical line route extraction process is not executed for any of the extracted optical cable routes, resulting in the failure to design the optical line route.
If an optical line route cannot be designed, it is necessary to take measures such as laying a new optical cable.

However, if the conditions are relaxed assuming that the second condition is not imposed, the optical line route extraction process is executed, so that it is possible to design optical line routes for the required number of lines.
Therefore, it is preferable to design only the first condition so that the optical line route can be designed.

  And, as described above, when there is an optical cable route that can design an optical line route composed of a combination of optical fiber core wires from the starting point to the end point only with the optical fiber core wires satisfying the first condition and the second condition, The route extraction means actually executes an optical line route extraction process for extracting an optical line route composed of a combination of optical fiber core lines from the start point to the end point only by the optical fiber core lines satisfying the first condition and the second condition.

At this point, it is only necessary to pick up as many optical line routes as necessary from the start point (device A) to the end point (device G) by combining optical fiber core wires. Since there are many fiber core line extraction methods, an example thereof will be described in an easy-to-understand manner.
In the following, the extraction of the optical line route for one line will be described, but the extraction of the optical line route for another line is also the same.

For example, for the optical cable j, the route extraction unit extracts all optical fiber core wires whose cable ID is j in the core route information data file and whose working / non-working flags are all 0.
In the following description, the extracted optical fiber core wire is referred to as an extracted optical fiber core wire J. In the present embodiment, since the second condition is satisfied, two or more optical fiber core wires are extracted optical fibers. It will be extracted as the core wire J.

The route extraction means similarly extracts the extracted optical fiber core wire M and the extracted optical fiber core wire T for the optical cable m and the optical cable t.
In the present embodiment, since the second condition is satisfied, two or more optical fiber core wires are extracted as the extraction optical fiber core wire M and two or more optical fiber core wires are extracted optical fiber core wires. It will be extracted as T.

And a route extraction means calculates | requires the connection state between extraction optical fiber core wires.
Specifically, referring to the start point connection point ID and the end point connection point ID in the core path information data file, the connection between the extraction optical fiber core J and the extraction optical fiber core M has already been completed. The connection completion extracted optical fiber core wire JM and the unconnected extracted optical fiber core wires that are not connected (the unconnected extracted optical fiber core wire J and the unconnected extracted optical fiber core wire M) are distinguished.

  Furthermore, the route extraction means, when the first connection completion extraction optical fiber core line JM exists, the second connection already completed between the first connection completion extraction optical fiber core line JM and the extraction optical fiber core line T. A distinction is made between the connection completion extracted optical fiber core wire JMT and the unconnected extraction optical fiber core wire T.

  On the other hand, when the first connection completion extraction optical fiber core line JM does not exist, the route extraction means has already completed the connection between the extraction optical fiber core line M and the extraction optical fiber core line T. A distinction is made between the connection-extracted extracted optical fiber core MT and the unconnected extracted optical fiber cores (unconnected extracted optical fiber core M and unconnected extracted optical fiber core T) that are not connected.

Then, when the second connection completion extraction optical fiber core line JMT exists, the route extraction means extracts the second connection completion extraction optical fiber core line that is not connected to the other optical fiber core line by the device A, When such a second connection completion extraction optical fiber core line JMT exists, one of them is picked up as an optical line route.
Here, the reason why the device A that is not connected to another optical fiber core wire is extracted is to preferentially pick up the device A that does not involve the work of cutting.

  At this time, if there are two or more second connection completion extraction optical fiber cores JMT that are not connected to another optical fiber core line in the device A, two of them may be picked up as optical line routes. .

  On the other hand, even if the second connection completion extraction optical fiber core line JMT exists, if the device A that is not connected to another optical fiber core line cannot be extracted, the route extraction means One of the extracted optical fiber cores J that is not connected to the other optical fiber cores in the device A is picked up, and one of the third connection completed extracted optical fiber cores MT is picked up, and the combination Is an optical line route for one line.

Furthermore, when neither the second connection completion extraction optical fiber core line JMT nor the third connection completion extraction optical fiber core line MT exists, the route extraction means uses the device A among the unconnected extraction optical fiber core lines J to Pick up one that is not connected to the optical fiber core, pick up one unconnected extracted optical fiber core M and one unconnected extracted optical fiber core T, and pick up the unconnected extracted optical fiber core J, unconnected A combination of the extracted optical fiber core M and the unconnected extracted optical fiber core T is used as an optical line route for one line.
The optical line route for one line is also referred to as a first optical line in order to make it easy to distinguish from the description of the route as a whole.

If the same procedure as described above is performed for the optical line route for another line, the optical line route for two lines can be extracted.
Of course, when extracting the optical line route for the other line, the optical fiber core line of the first optical line is excluded from the extraction target.
The optical line route for the other line is also referred to as a second optical line.

  For example, in order to make the last pickup process unambiguous, the one with the smallest wire number assigned to the optical fiber core wire is preferentially picked up, and the priority among them is the optical cable j, the optical cable. m and the optical cable t may be determined in this order.

  In this way, when the combination of the optical fiber core lines (first optical line and second optical line) to be the optical line route in the first optical cable route is obtained, the route extracting means is the same as that for the second optical cable route. Thus, the combination of the two sets of optical fiber core lines for the optical line route of the second optical cable route (the first optical line and the second optical line of the optical line route of the second optical cable route) is obtained.

  Further, when the first optical line and the second optical line of the optical line route of the second optical cable route are obtained, the route extraction means performs the same for the third optical cable route, and the optical line of the third optical cable route. A combination of two optical fiber core lines for the route (first optical line and second optical line of the optical line route of the third optical cable route) is obtained.

  In this embodiment, the case of securing two upstream and downstream lines has been described. However, in a usage pattern similar to a conventional television that does not exchange bidirectional data, only one downstream line can be secured. In some cases, an optical line route having a combination of optical fiber cores to be at least one or more optical lines is designed in designing an optical line route.

(Step S3)
When the combination of the optical fiber core lines serving as the optical line route is obtained, the control unit of the system server 10 functions as a transmission loss estimating unit that estimates the transmission loss of the entire optical line route, and extracts the extracted optical line route. A transmission loss estimation process for estimating each transmission loss is performed.

  Specifically, the estimated transmission loss per meter of the optical fiber core line accommodated in the optical cable j can be found from the cable type of the cable route information data file and the transmission loss of the cable loss information data file, and By multiplying the estimated value of the transmission loss per meter of the fiber core by the length of the optical cable j in the cable route information data file, the estimated value of the transmission loss of the optical line route corresponding to the position of the optical cable j can be obtained.

  Further, the estimated value of the transmission loss at the location corresponding to the optical cable m and the optical cable t in the optical line route can be obtained in the same manner.

  Whether or not the optical line route is already connected in the device B and the device D is already known when the optical line route is obtained. If the optical line route is already connected, the connection point loss information data file is used. An estimate of splice loss can be obtained.

  In addition, although the connection form is different between the first optical line and the second optical line of the optical line route and the connection loss may be different, in this case, the value with the larger connection loss is considered in view of safety. Should be adopted.

  Furthermore, for locations that are not already connected, for example, since there are generally many fusion splices, a splice connection is assumed as the default, and a connection loss estimate is given, and each connection is added to the total transmission loss estimate obtained earlier. If the sum of the estimated values of connection loss at points is added, an estimated value of transmission loss for the entire optical line route can be obtained.

  The estimated value of the transmission loss for the entire optical line route is to be displayed later on the display unit 11 on the optical line route, but when the optical line is opened, This is because it becomes one index when deciding which optical line route is actually adopted.

  For example, in the schematic diagram shown in FIG. 2, either the first optical cable route or the second optical cable route described above is the shortest distance as the optical line route, and the longer the length of the optical line route, the longer the optical fiber core wire. Therefore, there is a high possibility that the optical line route of the third optical cable route is not selected.

  However, even if a connection form with the lowest connection loss is selected among the connection forms such as fusion splicing, the connection loss generated at one connection point is 1 km in terms of the transmission loss of the optical fiber core wire. It becomes a loss so large that it corresponds to the loss of.

Therefore, when there are a plurality of devices between the devices A and B or between the devices B and D, the transmission loss of the entire optical line route of the first optical cable route is not necessarily the third optical cable route. It cannot be said that it is lower than the transmission loss of the entire optical line route.
The same applies to the second optical cable route when there are a plurality of devices between the devices C and D.

  For this reason, in this embodiment, a technique for narrowing the optical line route from the starting point (device A) to the ending point (device G) to the shortest length route is not adopted.

  Further, from the viewpoint of only the total transmission loss, it is possible to display only one optical line route when displaying on the display unit 11 described later.

However, when an optical line is opened, it is naturally accompanied by construction for that purpose, and some equipment may be considered by a construction contractor to avoid construction depending on the equipment.
For example, in the closure, there are multiple stages of fusion trays that allow the connection part to be accommodated by winding the extra length in a circle so that the connected optical fiber core and optical tape core can be stored neatly. Stored in a tidy state.

  However, when it is not so cleanly accommodated, there is an increased risk of accidentally disconnecting the working line during work.

  And the construction contractor knows the equipment that you don't want to touch if you can, and if the optical line route that does not go through the equipment is possible, if the difference in transmission loss is about a little, the equipment In some cases, it may be desired to select an avoidance route. From this point of view, it is better not to narrow down the optical line route displayed on the display unit 11 to one.

  In addition, not only when the closure is in an organized state, but also when an important line that is severely damaged by disconnecting the optical line passing through the closure passes, it is often desired to avoid it if possible.

  As described above, it is basically preferable that there are many optical line route candidates. For example, in the present embodiment, the second condition is described as being included in the present embodiment. Only one condition may be imposed so that many optical line route candidates composed of combinations of optical fiber core lines from the starting point (device A) to the ending point (device G) may be extracted.

  However, when the number of optical line route candidates is extremely large, it may be troublesome. Therefore, as shown in FIG. 5, the light displayed on the display unit 11 as a result of the optical line route design on the input screen 20. It is preferable to provide a display route number input unit 27 for determining the upper limit of the number of line routes.

  When the number of designed optical line routes exceeds the number input to the display route number input unit 27, priority is given to the optical line route that can secure the necessary number of lines, and the optical line route Of these, the one with a small estimated transmission loss for the entire optical line route may be preferentially displayed on the display unit 11.

(Step S4)
In other words, when the optical line route design is completed as described above, the control unit of the system server 10 functions as a result display unit for displaying the designed optical line route on the display unit 11 and designed. A display process for displaying all the optical line routes on the display unit 11 is executed.

FIG. 7 is a diagram showing a result display screen 30 that displays the result of optical line route design (empty route search result) of the optical line route design support system 1 on the display unit 11.
As shown in FIG. 7, the result display screen 30 is provided with a result list screen 31 on which a list of optical line routes designed on the upper side is displayed, and a detailed screen 32 for individually displaying optical line routes on the lower side. Is provided.

  In the result list screen 31, when a route is viewed on a map, a “map display color” indicating the display color of the route, a “route display” functioning as a route selection icon 33 capable of selecting a route to be displayed on the detailed screen 32, “Distance (m)” indicating the length of the route, “Number of devices” indicating the number of devices in the route, “Number of lines” indicating the number of lines secured in the route, and the total estimated in the route “Total transmission loss (dB)” indicating transmission loss is shown.

The number of lines is displayed with the number of lines required this time as the upper limit.
In other words, in this embodiment, two lines are to be secured, and since there are two optical lines for any of the optical line routes (Route 1, Route 2, and Route 3), the “number of lines” is 2 is displayed.

  On the other hand, in the present embodiment, since the second condition is imposed, a route for which the necessary number of lines cannot be secured is excluded from the design target. Therefore, the designed route is always the number of necessary lines. However, if the second condition is not imposed, that is, if only the first condition is used, a route having an insufficient number of lines is also designed.

If only the first condition is imposed, for example, if the route 3 is an optical line route that can secure only one optical line, the number of lines in the route 3 is displayed as one.
When securing two optical lines for the same subscriber's home as in the present embodiment, a route that can secure two optical lines with the same optical line route is often selected, as described above. By displaying the number of lines that can be secured, it is easy to make a determination to remove the route 3 from the construction target.

  On the other hand, FIG. 7 shows that the operation unit 12 is operated and the route 1 which is one of the optical line routes displayed on the display unit 11 is selected and displayed on the detailed screen 32. Reference numeral 1 denotes the optical line route of the first optical cable route described above.

  For this reason, since equipment that is the nearest equipment of the starting point “XX Building” and is connected to the starting equipment A with a drop cable is required, equipment A is surrounded by a circle and needs to be connected. It is displayed as.

  On the other hand, the device B is already connected, so it is not surrounded by a circle, and the device D is not connected, so that it is surrounded by a circle like the device A.

And, since equipment that is the nearest equipment of the end point “YY building” and is the end point of the equipment to the end point “YY building” is still necessary to connect with a drop cable, It is circled and displayed as a device that needs to be connected.
In addition, the line which connects between apparatuses typically represents the optical fiber core line for two lines.

However, the display on the detailed screen 32 is a comprehensive display in which the states of the optical lines for two lines included in the optical line route are combined.
For example, even if the first optical line, which is one of the two lines, has been connected by the device B and the device D, the second optical line, which is the other optical line, is the device B. When only the connection is made, the display is as shown in FIG.
This means that if the equipment needs to be connected to either the first optical line or the second optical line, the contractor will go to the equipment and perform the connection work. This is to accurately indicate whether the work needs to be performed.

  As described above, when one optical line route is selected from one or more optical line routes displayed on the display unit 11, the optical fiber core wire in the optical line route selected on the display unit 11 is directed from the start point to the end point. In addition to the display arranged in order, the presence / absence of connection between the displayed optical fiber cores is displayed, so it is possible to visually display the route that requires less connection work by displaying the route 1, route 2 and route 3 in order. Can be understood.

Although not shown in this screen, it is also possible to display the optical fiber core wire in each optical cable that should be actually selected for the optical line route. Then, connection work is performed on the device D and the device G.
In this display, it is also displayed which optical fiber core line needs to be connected in each optical line (first optical line and second optical line) of the optical line route.

  On the other hand, the detailed screen 32 is an on-map display icon 34 for viewing what kind of route the displayed optical line route is when actually viewed on the map. There is "Check on the map", so when you press it, it will be displayed on the map as a red line what kind of route this optical line route passes, so the state of the route on the map It is also something that can be visually confirmed.

  However, when displaying on the map, other routes (for example, route 2 is displayed with a yellow line and route 3 is displayed with a blue line) are also displayed. Therefore, each of the selected routes can be compared on the same map.

  In the optical line route design of the present embodiment, first, the Dijkstra method is applied to the optical cable, and the optical cable route extraction process for extracting the optical cable route is performed. Compared with the case where the Dijkstra method is applied to one hundred optical fiber core wires, the amount of calculation can be greatly reduced, and the optical line route can be designed in a shorter time.

  As described above, the present invention has been described based on the specific embodiments. However, the present invention is not limited to the above-described embodiments, and modifications and improvements to the embodiments are also included in the present invention. It is included in the technical scope.

  For example, when an optical line is opened, an optical cable with a small number of remaining optical fiber cores in the optical cable may be used only when it is essential, and may be avoided in other cases.

  Therefore, in step S2, the first condition and the second condition are included as the predetermined conditions in step S2. However, the optical fiber cores constituting the optical line route are the optical fiber cores accommodated in the optical cable. A third condition may be included in which the optical fiber core wire is accommodated in an optical cable in which the proportion of the optical fiber core wire in which the line usage status is empty is equal to or greater than the set proportion.

  For this purpose, as shown in FIG. 5, it is preferable that the input screen 20 is provided with a ratio input unit 28 for inputting the empty ratio.

  For example, when the ratio is 30%, as shown in FIG. 2, the optical cable k of the second cable route and the third cable route do not satisfy this condition, and the optical cable n of the second cable route However, since this condition cannot be satisfied, the optical line route extraction process for the second cable route and the third cable route is not executed.

  As a result, the optical line route to be designed is only the optical line route of the first cable route. At this time, only the route 1 is displayed on the result display screen 30 shown in FIG.

  In some cases, the conditions may not be satisfied for all the optical cable routes. In this case, the result display screen 30 shown in FIG. 7 indicates that “the optical line route could not be designed under the set conditions”. Since such a display is performed, it is only necessary to change the conditions so as to relax, and again to design an optical line route composed of a combination of optical fiber core wires.

  If the optical line route cannot be designed, a new optical cable will be laid.

  Note that the present invention is not limited to a specific embodiment, and is different from the purpose as long as it has a configuration (route search using a combination of optical fiber cores) that can achieve the object of the present invention. There is no problem even if a route search, for example, a route search in which the selection of the radio button of the unit selection unit 24 shown in FIG.

  Even in the case of route search using this optical tape core (in units of tape), as in the case of the optical fiber core, the route extraction means first extracts an optical cable route that extracts an optical cable route consisting of a combination of optical cables from the start point to the end point. Perform the process.

  Then, after that, the route extraction means uses the optical tape core wire accommodated in the optical cable of the optical cable route extracted by the optical cable route extraction process as the target, and only the optical tape core wire satisfying the predetermined condition, the light from the starting point to the end point. An optical line route extraction process for extracting an optical line route composed of a combination of tape cores is performed.

  In this case, since the optical tape core wire is targeted, the predetermined condition includes the first condition of the optical tape core wire having only the optical fiber core wire in which the line usage is all empty. Good.

  Further, if the predetermined condition includes the second condition in which the number of optical fiber core wires included in the optical tape core wire is equal to or greater than the number of optical fiber core wires corresponding to the required number of optical wires, the optical lines for the required number of lines are included. Are designed with the same optical tape core wire, and the connection work is more preferable because it can be performed by using a fusion splicer for the optical tape core wire that collectively connects the optical tape core wires.

  Further, as a predetermined condition, the optical tape core wire accommodated in the optical cable in which the proportion of the optical fiber core wire in which the line usage status is empty out of the optical fiber core wires accommodated in the optical cable is equal to or more than the set ratio is used. If the three conditions are included, the same design as the third condition described above for the optical fiber core wire can be performed with the optical tape core wire.

  On the other hand, the present specification includes not only a route search based on a combination of optical fiber core wires but also a useful technology, and therefore includes an invention which is the subject of the technology. It does not preclude that only it is implemented as an invention.

  For example, displaying the estimated total transmission loss estimated for each route along with multiple optical line routes is not limited to the combination of optical fiber core lines, but in the case of an optical line route design consisting of optical tape core line combinations It is also useful.

  Thus, the present invention is not limited to a specific embodiment, and modifications and improvements to the embodiment are also included in the technical scope of the invention.

DESCRIPTION OF SYMBOLS 1 Optical line route design support system 10 System server 11 Display part 12 Operation part 20 Input screen 21 Start point input part 22 End point input part 23 Elapsed point input part 24 Unit selection part 25 Line number input part 26 Search start icon 27 Display route number input Unit 28 Ratio input unit 30 Result display screen 31 Result list screen 32 Detailed screen 33 Route selection icon 34 Display icon on map

Claims (5)

An optical line route design support system for supporting optical line route design,
The optical line route design support system is:
A laying state database;
A route extracting means for extracting an optical line route from a starting point to an ending point based on the laying state database;
The laying state database is
Data for multiple installed optical cables,
Line usage data for each of the optical fiber cores housed in the optical cable, and
The route extraction means includes
An optical cable route extraction process for extracting an optical cable route comprising a combination of the optical cables from the start point to the end point;
Targeting the optical fiber core line accommodated in the optical cable of the optical cable route extracted in the optical cable route extraction process, the optical fiber core line extending from the start point to the end point only by the optical fiber core line satisfying a predetermined condition An optical line route extraction process for extracting the optical line route consisting of a combination of
The optical line route design support system, wherein the predetermined condition includes a first condition that is the optical fiber core line in which a line use status is empty.   The optical cable route extraction process is a process of extracting all the optical cable routes that are equal to or less than the preset number of optical cables and do not include the same optical cable a plurality of times. The optical line route design support system according to claim 1.   The predetermined condition includes a second condition that is the optical fiber core wire in the optical cable in which the optical fiber core wire satisfying the first condition exists in the same optical cable for a required number of lines or more. The optical line route design support system according to claim 1 or 2.   The predetermined condition is that the optical fiber accommodated in the optical cable in which the proportion of the optical fiber core wire in which the line usage status is empty out of the optical fiber core wire accommodated in the optical cable is equal to or more than a set proportion. The optical line route design support system according to any one of claims 1 to 3, further comprising a third condition that is a core wire. The optical line route design support system is:
A display unit capable of displaying one or more optical line routes extracted by the optical line route extraction process;
An operation unit capable of selecting one of the one or more optical line routes displayed on the display unit,
The laying state database comprises data on the connection status between the optical fiber core wires,
When one optical line route is selected from the one or more optical line routes displayed on the display unit by the operation unit, the optical fiber core wire in the optical line route selected on the display unit is 5. The presence / absence of connection between the displayed optical fiber cores is displayed together with the display arranged in order from the start point to the end point. 6. Optical line route design support system.