JP2005156663A - Wiring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is necessary to perform a pulling-up construction again at each time of a lack of secondary coated optical fibers because a plurality of spare secondary coated optical fibers are pulled up at each pulling-up point when pulling up a plurality of secondary coated optical fibers to the ground from under the ground and can be used only at the pulling-up point and surplus secondary coated optical fibers cannot be used at other pulling-up points lacking coated optical fibers. <P>SOLUTION: Spare secondary coated optical fibers are shared at a plurality of pulling-up points. and partial space secondary coated optical fibers under the ground are pulled up in a plurality of points. Thus spare secondary coated optical fibers are shared at individual pulling-up points to reduce the number of space secondary coated optical fibers of the entire system. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wiring having a main line and a branch line. In detail, it is related with the wiring which utilizes the function of a trunk line in several branch locations. For example, the present invention relates to an optical fiber core wire in which a plurality of optical fiber cores are optically connected to a master station and a slave station via the underground.

For example, communication using an optical fiber typified by FTTH (Fiber To The Home) is rapidly spreading due to diversification and large capacity of communication.
Conventionally, as one of the optical fiber installations, an optical cable connected to the master station is installed underground, and some optical fiber core wires are pulled up to the ground at necessary locations, and the slave station is connected via a utility pole etc. There is a method of overhead wiring for each user. (For example, Patent Document 1)

  In general, when an optical fiber core is laid from a master station to a plurality of slave stations such as user's homes, as shown in FIG. 6, a plurality of trunk optical fiber cores 21 to 29 connected to the master station 1 are included. The trunk optical cable 3 is laid in the basement. In the area A, for example, a part of the trunk optical fiber cores 21 to 24 in the trunk optical cable 3 branches from the underground branch box 4A at the branch points 51 to 54 to branch lines 61. To 64. Here, the branch lines 61 and 62 have already been scheduled to be used and are pulled up to the ground, and distributed from the existing closure box 7A arranged between the utility poles to each of the slave stations 81 and 82 in the area. The

  The branch lines 63 and 64 are pulled up to the ground as spare lines that are not scheduled to be used at the present time. This is because the underground wiring work is in an environment where workability is poorer than the overhead wiring work, and the work of repeatedly raising the branch line is avoided. Similarly, in the area B, the trunk optical fiber cores 25 to 28 are branched at branch points 55 to 58 to form branch lines 65 to 68, and some branch lines 65 and 66 are connected to the slave stations 85 and 86. These branch lines 67 and 68 are laid as spare lines so as to prepare for future demand. In this case, the branch lines 61 to 68 are branched from the separate trunk optical fiber cores 21 to 28, respectively. That is, the branch lines 61 to 68 use one core optical fiber core 21 to 28 per core. For this reason, for example, if the spare branch line 64 is not used in the A area due to miscalculation of demand prediction, the trunk optical fiber core 24 is wasted and has no other use. Similarly, when the slave station 81 becomes unnecessary later, there is a problem that the trunk optical fiber core 21 in the trunk optical cable 3 connected thereto cannot be used and is wasted. . For example, even if there is an increase in the number of slave stations exceeding the demand forecast in the B area and the branch lines in the B area are insufficient, the surplus branch lines 61 and 64 in the A area are connected to the slave stations in the B area. Since redundant overhead wiring is required and generally not a good idea, there has been no change in the situation that the trunk optical fibers 21 and 24 are wasted and cannot be utilized.

JP-A-10-90524

  Accordingly, an object of the present invention is to provide a wiring that utilizes the function of the main line at a plurality of branch points in a wiring having a main line and a branch line.

  The wiring according to claim 1 includes a trunk line having at least one core wire, and at least one predetermined core line of the trunk line is branched at a predetermined branch point to form a branch line, and the branch line bypasses The predetermined core is connected after the branch point, and the predetermined core is further branched at another branch point to form a branch line. Of course, there is no problem even if the connection point is included in the detour.

  A wiring according to a second aspect is the wiring according to the first aspect, wherein at least one of the branch lines is a spare line.

The wiring according to claim 3 is the wiring according to claim 1, wherein at least one of the branch lines is divided in the course of detouring, and one of the divided ends of the branch line is connected to a slave station. Features.
Here, the division in the middle of the detour does not necessarily need to be divided after the detour wiring is once completed, but naturally includes a state in which the detour is completed if some wiring is added.

  A wiring according to a fourth aspect is the wiring according to any one of the first to third aspects, wherein the trunk line is laid in the basement and the branch line is laid in the ground. Of course, the branch line laid to the ground does not necessarily need to be laid to the ground, and the laying may be interrupted underground.

  A wiring according to a fifth aspect is the wiring according to any one of the first to fourth aspects, wherein the core wire is an optical fiber core wire.

  A wiring according to a sixth aspect is the wiring according to any one of the first to fifth aspects, wherein at least a part of the branch line is connected to a switching mechanism.

  According to the wiring of the first aspect, the branch line branched from the predetermined core wire is bypassed and connected to the predetermined core wire, and the predetermined core wire is further branched at another branch point to form a branch line. Therefore, if one of a plurality of branch lines branched from the predetermined core line is utilized, it functions as a core line of the trunk line and there is no waste.

  According to the wiring according to claim 2, since the branch line is a spare line, even if the spare line is surplus at the first branch point, if the spare line is required at the second and subsequent branch points, the predetermined core The line will be utilized. In other words, even if there is a miscalculation in the demand forecast for each branching point when determining the number of spare line cores, if the overall demand forecast is appropriate, there will be no waste in the trunk line.

  According to the wiring according to claim 3, the branch line of the branch line is divided in the course of detouring, and one end of the branch line is connected to the slave station after the branch line is divided. By connecting the branch line connected to the slave station to the other end where the branch line was divided and completing the detour when it is no longer needed, the trunk line can be used at other branch points. There is no waste.

  By the way, when the trunk line is laid underground and the branch line is laid above the ground, it is often difficult to branch the branch line from the underground trunk line. It is preferable to branch as many branch lines as possible. However, in conventional wiring, one core line is required for one branch line, so an increase in the number of branch lines means an increase in the number of trunk lines. In some cases, waste was generated.

Therefore, according to the wiring according to the present invention as set forth in any one of the first to third aspects, even when the trunk line is laid in the basement and the branch line is laid to the ground, Since the number of branch lines can be increased with respect to the number of cores, it is possible to reduce the necessity of difficult underground trunk branch work. This means that, for example, it is possible to provide a larger number of spare lines with respect to the number of cores of a predetermined trunk line, and if a large number of spare lines are provided, it is unlikely that a branching operation is required. . In addition, when the trunk line is laid underground, the size of the wiring is wide and the distance between the branch points is often long. In such a case, even if a branch line is surplus at a certain branch point, it is difficult to wire the branch line to a slave station near another branch point.
That is, it is more effective if the present invention is applied to the case where the trunk line is laid in the underground and the branch line is laid to the ground as in the wiring according to claim 4.

In recent years, the laying of optical fibers has been spreading rapidly. However, the branching work of optical fibers often requires alignment of the optical axis, and is often difficult. It is easy to adapt to changes. Moreover, since communication using optical fiber is a relatively new field, it is difficult to predict demand, and it is necessary to flexibly cope with changes in circumstances after the fact.
Therefore, it is more effective if the present invention is applied to the optical fiber wiring as in the wiring according to the fifth aspect.

  Furthermore, the present invention assumes a change in the wiring of the branch line after the initial installation, and the wiring of the branch line is changed when at least a part of the branch line is connected to the switching mechanism as in the wiring according to claim 6. Is easier and more preferable.

For example, a part of the branch line that is branched and pulled up from, for example, the first optical fiber core of the trunk optical cable laid in the basement is detoured and pulled down to the basement again. The pulled branch line is reconnected to the first optical fiber core of the trunk optical cable. This branch line is used as a spare line. In addition, the 1st optical fiber core wire is parted between the branch location and the reconnection location. The first optical fiber core wire is branched again at another location and pulled up.
When a branch line as a spare line pulled up to the ground is used, it is switched via a switching mechanism.

  For example, the second optical fiber core of the trunk optical cable is branched to form a branch line and connected to the slave station. Also, a dummy branch line is pulled up in the vicinity of the branch line branched from the second optical fiber core that is branched and disconnected from the master station and connected to the slave station. That is, it is detoured after branching and pulled down again in the same way as the backup line, but it is divided in the middle of detouring, and one end of the divided master music side is connected to the slave station.

Hereinafter, the present invention will be described based on illustrated embodiments.
In FIG. 1, as in FIG. 6, 1 is a master station, 21 to 29 are trunk optical fiber cores, 3 is a trunk optical cable, 4A and 4B are underground branch boxes, 51 to 58 are branches in the branch boxes 4A and 4B. Points 61 to 68 are branch lines branched from the trunk optical fiber core wires 21 to 28, 7A and 7B are wiring boxes, and 81, 82, 85, and 86 are slave stations. The trunk optical fiber cores 21, 22, 23, 24, 27, 28 of the trunk optical cable 3 connected to the master station underground are branch points 51 </ b> A, 52 </ b> A, 53 </ b> A, 54 </ b> A in the underground branch box 4 </ b> A in the A area. It is divided at 57A and 58A and connected to branch lines 61A, 62A, 63A, 64A, 67A and 68A. The branch lines 61A and 62A have already been scheduled to be used and are pulled up to the ground by being assigned to the two cores of the ten optical cables 9A and connected to the slave stations 81 and 82 via the wiring box 7A. The branch lines 63A, 64A, 67A, and 68A are not planned to be used at the present time and are laid as spare lines. The four cores of the 10 optical cables 9A are allocated to the ground and pulled up to the ground. On the other hand, the trunk optical fiber core wires 23, 24, 27, and 28 are also branched at the branch points 53′A, 54′A, 57′A, and 58′A after the branch points 53A, 54A, 57A, and 58A, and the return branch line 63 is branched. The four cores of 10 optical cables 9A are assigned as' A, 64'A, 67'A, 68'A and then pulled up to the ground.
The branch lines 63A, 64A, 67A, 68A and the branch lines 63′A, 64′A, 67′A, 68′A are respectively connected by the four-fiber package optical connector 10 to form a detour line.

  In the area B, the trunk optical fiber core wires 23, 24, 25, 26, 27, and 28 are branched by the branch box 4B and connected to the branch lines 63B, 64B, 65B, 66B, 67B, and 68B. The branch lines 65B and 66B are already scheduled to be used and are connected to the slave stations 85 and 86. The branch lines 63B, 64B, 67B, 68B are laid as spare lines, and return branch lines 63'B, 64'B, 67'B, 68'B, branch points, 53'B, 54'B, It bypasses via 57'B and 58'B, and is connected to the trunk optical fiber core wires 23, 24, 27, and 28.

  Thus, the trunk optical fiber core wire can be shared by a plurality of areas by using the branch line that is branched and pulled up from the trunk line and is detoured and pulled back as a backup line. That is, for example, the trunk optical fiber core 23 is connected to the branch lines 63A and 63B, but if it is necessary to add a slave station in either the A area or the B area, either of the branch lines 63A or 63B is connected. By connecting to the added slave station, it is used as a trunk line and is not wasted.

  In the first embodiment, the branch line scheduled to be used is 2 cores, the branch line to be laid as a spare line and the return branch line are 4 cores, respectively, and the optical fiber 9A is pulled up to the ground. It can select suitably, without being restricted to. In this embodiment, the number of cores is set to be small for the sake of explanation. Actually, for example, there are 32 branch lines scheduled to be used, 4 spare lines, 4 return spare lines, and a total of 40 optical cables on the ground. It may be raised. Further, in this embodiment, the present invention is more effective, and is set as a case where the trunk line is laid in the underground and the branch line is laid on the ground, but the place where the trunk line and the branch line are laid can be appropriately selected. . Of course, not only the optical fiber but also electrical wiring may be provided.

In this embodiment, the branch line, the backup line, and the return branch line that are scheduled to be used are wired by the same optical cables 9A and 9B. However, separate optical cables may be used.
In the above embodiment, the wiring boxes 7A and 7B can use existing overhead wiring boxes, and may be formed by providing another connection box separately on the utility pole or on the ground. Furthermore, in the present embodiment, the area has been described as two areas of area A and area B. However, if more areas are provided and branch lines are detoured and connected repeatedly in each area, the trunk optical fiber core can be used more. Opportunities to increase are more effective.

In the first embodiment, the bypass optical fiber core line 2 connected to the spare line is shared by using the bypass branch line as the spare line, but this may be applied to the branch line scheduled to be used. it can. A second embodiment will be described below.
Referring to FIG. 2, trunk optical fiber core 21 of trunk optical cable 3 laid underground and connected to a master station is branched in branch box 4A in area A, connected to branch line 61A and pulled up to the ground. And connected to the slave station 8. That is, the branch line 61A is scheduled to be used in advance.

  Here, the trunk optical fiber core 21 is divided at the branch point 51A, and the divided trunk optical fiber 21 is connected to the return branch line 61′A. Further, the trunk optical fiber core wire 21 is also branched at 51B in the B area and connected to the branch line 61B for the backup line. As a result, when the slave station 8 is no longer needed in the area A, the branch line 61B in the area B is connected to the return branch line 61′A to connect to the branch line 61B laid as a spare line in the area B. If this occurs, the trunk optical fiber core 21 can be used and is not wasted. If the branch line 61B in the B area is detoured via the return branch line 61'B and the branch point 51'B and connected to the trunk optical fiber core 21, new demand arises in areas other than the B area. Even in this case, the trunk optical fiber core 21 can be used as a trunk and is more effective.

In the first embodiment, it is assumed that the branch line for the backup line and the return branch line are connected by the four-fiber collective optical connector 10 and returned to the basement.
However, in actual wiring, for example, it may be assumed that it is used by connecting to a slave station added for each single core such as a branch line 68A for a spare line. In that case, as shown in FIG. 3 (a), each branch line 63A, 64A, 67A, 68A and return branch line 63'A, 64'A, 67'A, 68'A 'are previously connected to each single core. If necessary, as shown in FIG. 3 (b), for example, only the branch line 68A for the spare line may be cut off and connected to the slave station.

Since this laying method is laid for each single core, the required number of trunk optical fiber cores connected to the branch line for the spare line can be used in a specific area, and the rest can be used in other areas. it can.
In the case of the embodiment of FIG. 3, after separating into single cores so that the four cores can be separated together, the four core wires are assembled again, and the pull-back optical fiber cores are connected via the four-core batch type optical connector 10. An example of connection to a line is shown.

  In Example 3 above, as a method of separating the standby branch line into a single core, the standby branch lines are simply separated, but when switching is considered, as shown in FIG. The branch lines 63A, 64A, 67A, and 68A for the spare lines may be returned and connected to the return branch lines 63′A, 64′A, 67′A, and 68′A by the single-core optical connector 12.

FIG. 5 shows still another embodiment of the present invention.
FIG. 5 is largely different from the above embodiments in that a single-core switching board is disposed in the imaginary wiring boxes 7A and 7B. That is, four single-core switching boards 13a, 13b, 13c, 13d are arranged in the A area wiring box 7A, and four single-core switching boards 14a, 14b, 14c and 14d are arranged.

The branch line 6JA and 6JB and the branch lines 6KA and 6KB that are planned to be used from the trunk optical fiber core wire 2 (multiple cores) of the underground trunk optical cable 3 are pulled up by the branch optical cable, and over the aerial via the utility pole 15 Pulled up. In general, the optical fiber cores pulled up are tape optical fiber cores in which a plurality of optical fiber cores are bundled. Therefore, in this embodiment, the branch lines 6JA, 6JB, 6KA, and 6KB that are pulled up from the underground are each single core. And are connected to the single-core switching boards 13a and 14a. Further, the single-core switching board 13d in the A area is connected to the B via the return branch line 6'KA branched from the branch point 5'A after the branch point 5A of the trunk optical fiber core 2 and the spare line branch line 6KB. It is connected to a single-core switching board 14C in the area. The trunk optical fiber core wire 2 is connected to the slave station 8 via the single-core switching board 13b according to the demand of the slave station 8 in the A area. In the area B, the branch line 6JB scheduled to be used is branched from the trunk optical cable 3 and connected to the slave station 8 via the single-core switching boards 14a and 14b. In this state, when the number of slave stations 8 increases in the area A, the branch line 6KA connected to the single-core switching boards 13a to 13d may be connected to the slave station 8 via the single-core switching board 13b.
When the number of slave stations 8 increases in the area B, the branch line 6KB connected to the single-core switching board 14c may be connected to the slave station 8 via the single-core switching board 14d.

In this embodiment, switching is performed for each single core between the single core switching boards 13 and 14 in the imaginary wiring boxes 7A and 7B, but the present invention may be performed by batch switching for each tape core. good.
In the present invention, the single core switching panel 14 may be connected using a single core cord with a connector in consideration of simple detachability. When connection loss is considered, or when it is determined that there is no switching, permanent connection represented by fusion connection may be performed. The same applies to the case where wiring is performed for each tape.
In FIG. 5, wiring is carried out over the ground, but a casing having a similar function may be separately installed on a utility pole or the ground. Also, if it is determined that the work in the basement is easier than aerial, it is possible to have the same function in the underground wiring box.

1 is an optical fiber latitude diagram illustrating an outline of the present invention. The principal part optical fiber wiring diagram which shows one Example of this invention. The principal part optical fiber wiring diagram which shows the other Example of this invention. The principal part optical fiber wiring diagram which shows the further another Example of this invention. The principal part optical fiber wiring diagram which shows the further another Example of this invention. The optical fiber wiring diagram which shows an example of a prior art example.

Explanation of symbols

1 Master station 21-29 Trunk optical fiber core 3 Trunk optical cable 4A Branch box 4B Branch box 5A Branch point 5 Branch point 51-58 Branch point 51A Branch point 53A Branch point 6 Branch line 61-68 Branch line 6JA Branch line 6JB Branch Line 6KA Branch line 6KB Branch line 6KA Spare line branch line 6KB Spare line branch line 61A Branch line 61B Branch line 63A Branch line 63B Branch line 65B Branch line 68A Spare line 7A Wiring box 7B Wiring box 8 Slave station 81 Slave station 83 Slave station 85 Slave station 9A Optical cable 10 Collective optical connector 12 Single-core optical connector 13 Single-core switching board 13a Single-core switching board 13b Single-core switching board 14d Single-core switching board 14 Single-core switching board 14a Single-core switching board 14c Single-core Switching panel 14d Single-core switching panel 15 Telephone pole

Claims (6)

  A trunk line having at least one core line, wherein at least one predetermined core line of the trunk line is branched at a predetermined branch point to form a branch line, and the branch line is bypassed to the predetermined core line Wiring which is connected thereafter and the predetermined core wire is further branched at another branch point to become a branch line.   The wiring according to claim 1, wherein at least one of the branch lines is a spare line.   2. The wiring according to claim 1, wherein at least one of the branch lines is divided in the course of detouring, and one divided end of the branch line is connected to a slave station.   The wiring according to any one of claims 1 to 3, wherein the trunk line is laid in the basement and the branch line is laid to the ground.   5. The wiring according to claim 1, wherein the core wire is an optical fiber core wire. 6. The wiring according to any one of claims 1 to 5, wherein at least a part of the branch line is connected to a switching mechanism.

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