JPH083569B2 - Optical fiber cable wiring structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wiring structure of an optical fiber cable, and more particularly to a branching structure of an optical fiber core wire.

<Prior Art> When branching an optical fiber core wire from an optical fiber cable, it is known to provide an extra length for branch connection at that portion so as not to damage the optical fiber core wire at the extraction portion. . A means for securing the branch connection extra length is disclosed in Japanese Patent Application No. 57-91085. This means adopts a configuration in which the cutting width for branching the optical fiber core wire is separated from the branching section to reduce the removal width of the jacket of the branching section. That is, a position where a branch connection extra length can be taken is determined from the position where the branch box is provided, the jacket of the optical fiber cable is removed at that position, and the optical fiber core wire to be branched is cut. Then, the cut optical fiber core wire is pulled out from the optical fiber cable in the branch box and branched, and the portion from which the outer cover is removed is covered with a sleeve or the like.

<Problems to be Solved by the Invention> However, in the case of the conventional example having such a configuration, since the part of the cut optical fiber core wire on the side not branched and connected remains unused, the optical Advantages of fiber cable There is a problem that efficiency is low.

Further, it is very troublesome to cover the part where the outer cover is removed with a sleeve or the like every time the optical fiber core wire is branched.

Further, there is a problem that the branching work is extremely difficult when the part where the outer cover is to be removed is buried in the wall of the building.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wiring structure of an optical fiber cable capable of easily branching the optical fiber cable.

<Means for Solving Problems> In order to achieve such an object, the present invention has the following configuration.

That is, the present invention is composed of a jacket and a plurality of optical fiber core wires inside, and both ends of an optical fiber cave laid in a lube shape inside a building or the like are connected to a control unit serving as a master unit. In the wiring structure of the optical fiber cable, a branch box is provided at a predetermined position of the optical fiber cable, and the same optical fiber core wire branched from any two branch boxes is for branch connection. The optical fiber core wires cut in the branch boxes at positions separated from the two branch boxes by a distance satisfying the surplus length are respectively pulled out from the optical fiber cables in the two branch boxes to be branched. It is characterized by being branched.

<Examples> Hereinafter, the present invention will be described in detail based on Examples shown in the drawings.

The drawings show the wiring structure of an optical fiber cable according to an embodiment of the present invention. In the figure, reference numeral 1 is, for example, an optical fiber cable laid in a loop through each floor of a building. The optical fiber cable 1 accommodates a plurality of optical fiber core wires 4 in a jacket 3. In this embodiment, a total of six optical fiber core wires 4a, 4b, 4c, 4a 'for transmission and reception are used. , 4b ', 4c' are stored. These optical fiber core wires are inserted into, for example, a small-diameter pipe (not shown) so that each core wire can be pulled out from the optical fiber cable. On each floor of the building, there is a terminal device 6 connected to a branched optical fiber core wire, and at one end of the optical fiber cable 1, a control serving as a master device for exchanging signals with the terminal device 6 is performed. The part 5 is connected.
The control unit 5 is configured to be able to send and receive signals from both ends of the connected optical fiber cable 1.

On each floor (…, n−1, n, n + 2,…) of the building, a branch box 2 (2a, 2b, 2c, 2d) is provided at a location where the optical fiber cable 1 is branched or where a conventional branch is expected. Is provided. Then, in these branch boxes 2, the jackets of the optical fiber cables 1 are removed. These branch boxes 2 are provided when the optical fiber cable 1 is laid. In each branch box 2, the optical fiber core wire 4 branched from the optical fiber cable 1 is connected to the terminal device 6 via the connector 7.
Is connected to the local optical fiber cable 8.

The branch wiring structure of the optical fiber core wire 4 will be further described below.

Now, set the optical fiber cores 4a and 4a 'for transmission and reception to n
When branching on the -1st floor and the n + 1th floor and connecting to the terminals 6 on the respective floors, the optical fiber core wires 4a, 4
A'is cut at the branch box 2b on the nth floor. And n-
In the branch box 2a on the first floor and the branch box 2c on the (n-1) th floor, the ends of the cut optical fiber core wires 4a and 4a 'are drawn out and branched, respectively, and connected to the connector 7. Although not shown, the optical fiber core wires 4a, 4a ′ up to the connection tool 7 are not, for example, in a large curved shape or a slack shape so that strong tension or bending force is not applied to them. It is arranged with a so-called margin, and for this arrangement, it is necessary to secure an extra length for branch connection of up to 1 to 2 m when it is large. In the embodiment, branch boxes 2a, 2b, 2c
Each distance between them corresponds to a height between floors of about 4 m, and the optical fiber core wires 4a and 4a 'drawn out from between them have a sufficient branch connecting extra length. Similar to the branch wiring described above, when branching at the nth floor and n + 2, the optical fiber core wires 4a and 4a 'are cut by the branching box 2c at the n + 1th floor, and are pulled out and branched in the same manner as described above.

In this way, when the optical fiber core wires 4a and 4a 'are branched and connected to the terminals 1 on the n-1 floor and the n-1 floor,
The terminals 6 can exchange signals with the controller 5 by using the same optical fiber cores 4a and 4a '.
Although not shown in the figure, it goes without saying that other optical fiber core wires can be similarly branched and signals can be exchanged between the terminal unit 6 and the control unit 5 connected to these. Absent.

In the above embodiment, the optical fiber core wire cut on the nth floor is drawn out by the branch boxes on the n-1th floor and the n + 1th floor, but the present invention is not limited to such branching.
For example, you may branch by pulling out by each branch box of the n-2 floor and the n + 2 floor.

Further, the optical fiber core wire may be cut into branch boxes on the nth floor and the n + 1th floor, respectively, and pulled out from the branch boxes on the n-1st floor and the n + 2nd floor to branch.

Furthermore, in the above-mentioned embodiment, the configuration in which the optical fiber cable is laid vertically is shown, but it is also applicable to the case where the optical fiber cable is laid horizontally in the same floor. In this case, the branch box is provided for each room, for example, where the branch of the optical fiber core wire is expected.

In addition, in the above-mentioned implementation, although it was described that the jacket of the optical fiber cable in the branch box was removed in advance, the present invention is not limited to this, and the jacket may be removed when performing the branching work. You may

<Effects of the Invention> As is apparent from the above description, according to the present invention, both ends of the cut optical fiber core wire are pulled out from different branch boxes and used by branching, so that they are laid. It is possible to use the optical fiber disable core wire without waste.

Further, according to the present invention, since the optical fiber core wire can be cut in the branch box attached in advance, it is difficult to take out the optical fiber cable embedded in the wall, for example, as in the conventional example. Moreover, since the cutting portion is housed in the branch box, it is not necessary to cover the optical fiber cable of the cutting portion with a sleeve or the like, and the branch wiring work of the optical fiber core wire can be performed extremely easily and quickly. .

[Brief description of drawings]

The drawings are illustrations of a wiring structure of an optical fiber cable according to an embodiment of the present invention. 1 ... Optical fiber cable, 2 ... Branch box, 3 ... Jacket, 4 ... Optical fiber core wire.

Claims (1)

[Claims] 1. An optical fiber cable comprising an outer sheath and a plurality of inner optical fiber core wires, which are laid in a lube shape in a building or the like, and both ends of which are connected to a control unit serving as a master unit. In the wiring structure of the fiber cable, a branch box is provided at a predetermined position of the optical fiber cable, and the same optical fiber core wire branched from any two branch boxes has a branch connection extra space. From the two branch boxes by a distance satisfying the length, the optical fiber core wires cut in the branch boxes at positions separated from each other are respectively pulled out from the optical fiber cables in the two branch boxes to be branched. Optical fiber cable wiring structure characterized by being branched.