JP4247544B2 - Fiber optic cable distribution board - Google Patents

Description

  The present invention is provided with a fusion unit in which a fusion splicing tray is stacked in multiple stages on the housing frame, and an optical fiber cable core wire is introduced from one side to each fusion splicing tray. The present invention relates to an optical fiber cable distribution board which is accommodated so as to be capable of receiving connection.

  In general, an optical fiber cable distribution board is used as a device that can be connected between optical fiber cables or between an optical fiber cable and a transmission device. A fusion unit is provided in which a drawer-type fusion connection tray is stacked on the body in multiple stages.

  An example of such an optical fiber cable distribution board is shown in FIG. 2, and the optical fiber distribution board 1 in this example is of an under-introduction type and is fusion-bonded on the lower side in the housing frame 2. A fusion unit 4 in which the trays 3 are vertically stacked in multiple stages is disposed, and a connector unit 6 in which the connector trays 5 are vertically stacked in multiple stages is disposed. Then, the optical fiber cable core wire 7 on the line side introduced from below is drawn into each fusion splicing tray 3, and the optical fiber cable core wire 7 thus drawn is connected to another optical fiber cable via a jumper cord 8. It is connected to the core wire 7 or led to the connector unit 6 through a cord 9 with a connector.

  The optical fiber cable core wire 7 drawn into each fusion splicing tray 3 is conventionally drawn from one side of the fusion splicing tray 3 as shown in FIG. The cord with connector 9 is drawn from the other side of the fusion splicing tray 3. Further, in the inside of the fusion splicing tray 3, a first extra length accommodating portion 10 that accommodates the extra length portion 7 a of the optical fiber cable core wire 7 in order to secure an extra length for pulling out the tray. And a second surplus length accommodating portion 11 for accommodating the surplus length portions 8a and 9a of the jumper cord 8 and the cord 9 with a connector, and the optical fiber cable core wire 7 and the jumper via these surplus length accommodating portions 10 and 11. The cord 8 or the cord with connector 9 is abutted, and the abutting portion is fused and bonded to the fusion holder 12 (see Non-Patent Document 1).

Thus, conventionally, the optical fiber cable core 7 of the access system is inserted from one side (right side), and the jumper cord 8 and the cord 9 with connector are inserted from the other side (left side), Optical fiber cable core wires inserted into different fusion splicing trays 3 are connected to each other via a jumper cord 8 or to a cord 9 with a connector.
“Instruction Manual for Optical Fiber Cable Board”, MUS-H-024, Shoden Co., Ltd., May 2001, p1-9

  However, in the configuration described above, the optical fiber cable core wire 7 for the access system is inserted from one side (the left side when viewed from the front of the frame), so a new optical fiber cable core wire is provided. When an additional connection is to be made, a new fusion splicing tray 3 is required each time it is added, and it is necessary to add a jumper cord 8 or a cord 9 with a connector as the number of splicing connection trays 3 increases. .

  For this reason, when a large amount of the optical fiber cable core 15 is added, there is no space for mounting a new fusion splicing tray 3 on the housing frame 2, and the housing frame 3 is added or a large-sized optical wiring board. In addition, a large amount of optical cords (jumper cords 8 and cords 9 with connectors) that are fusion-bonded to the optical fiber cable cores are required. There is a disadvantage that the transmission characteristics deteriorate due to the increase in the transmission rate.

The present invention has been made in view of the above-described circumstances, and increases the capacity of the optical fiber cable core without adding a fusion splicing tray or housing frame, and further includes a jumper cord or a cord with a connector. The main purpose is to provide an optical fiber cable distribution board that reduces the number of wires and reduces work man-hours and costs, and reduces the number of connections to prevent deterioration of transmission characteristics (to reduce loss). It is an issue. Another object of the present invention is to secure an extra length in the tray for pulling out the fusion splicing tray while ensuring the minimum radius of curvature of the optical fiber cable core.

In order to achieve the above object, an optical fiber cable distribution board according to the present invention has a fusion unit in which drawer-type fusion connection trays that can be taken in and out in the front-rear direction are stacked in multiple stages. In the configuration in which an optical fiber cable core wire is introduced into each of the fusion splicing trays and accommodated so as to be capable of fusion splicing, at least a part of the light forming the first group is formed in the fusion splicing tray. A fiber cable core wire and a second group of optical fiber cable core wires are introduced from one side provided along the insertion / removal direction of the fusion splicing tray, and in the fusion splicing tray, A first surplus length accommodating portion that accommodates an extra length portion of the optical fiber cable cores that form the first group; and a second that accommodates an extra length portion of the optical fiber cable core wires that form the second group. The extra length storage part is inserted and removed The optical fiber cable cores that are arranged in parallel between the side portions on the back side and that are introduced from the one side portion and that form the first and second groups are connected to the first extra length housing portion and the second extra portion. It leads to between the long accommodating parts, from there through each corresponding extra length accommodating part, it is routed from the outside, but it is abutted at the part on the near side in the insertion / extraction direction from the first and second extra length accommodating parts, It is characterized in that the butted portions are fusion spliced.

Therefore, when adding the optical fiber cable cores forming the second group, according to the conventional configuration, the optical fiber cable cores forming the first group and the optical fiber cable cores forming the second group are according to the conventional configuration. Are inserted from one side into separate fusion splicing trays, and jumper cords or connector cords are inserted into the optical fiber cable cores inserted into these splicing trays from the other side. However, according to the configuration of the present invention, the optical fiber cable cores forming the first group and the optical fiber cable cores forming the second group in at least some of the fusion splicing trays. The optical fiber cable core wire forming the first group and the optical fiber forming the second group are inserted from one side portion provided along the insertion / removal direction in the same fusion splicing tray. Cable core Are directly fused in the fusion splicing tray, eliminating the need for jumper cords and cords with connectors, which were necessary as relay cords, and the fusion splicing required to accommodate these cords. It becomes possible to use the space in the tray for the accommodation space for the optical fiber cable cores forming the second group. For this reason, it is possible to increase the number of optical fiber cable cores that can be inserted without increasing the number of welding units and accommodating frames, and it is possible to reduce the number of jumper cords and cords with connectors.

In the fusion splicing tray, a first surplus length accommodating portion for accommodating a surplus length portion of the optical fiber cable core wire forming the first group, and an optical fiber cable core wire forming the second group. An optical fiber forming a first group and a second group, which are provided from the one side part by arranging a second extra length accommodating part accommodating the extra length part in parallel between the side parts on the back side in the loading / unloading direction. The first and second surplus lengths are guided by guiding the cable core wire between the first surplus length accommodating portion and the second surplus length accommodating portion and from there through the corresponding surplus length accommodating portions. Since the end portion of the optical fiber cable forming the first group and the second group is fusion-connected, the minimum bend radius of the optical fiber cable forming the first and second groups is secured. At the same time, the extra length for pulling out the fusion splicing tray is secured in the tray It becomes possible.

Further, in the above-described configuration, the optical fiber cable core wire forming the first group is introduced through the first introduction port provided in the fusion splicing tray, and the light forming the second group. The fiber cable core wire may be introduced through a second introduction port different from the first introduction port provided in the fusion splicing tray .

  With such a configuration, the optical fiber cable cores forming the first group and the optical fiber cable cores forming the second group can be inserted from one side without interfering with each other. Become.

As described above, according to the optical fiber cable distribution board of the first aspect, at least a part of the fusion splicing tray that can be inserted and removed in the front-rear direction of the fusion unit provided in the housing frame, The optical fiber cable cores forming the first group and the optical fiber cable cores forming the second group are introduced from one side provided along the insertion / extraction direction, and the introduced first group light Since the fiber cable cores and the optical fiber cable cores forming the second group are directly fused and connected in the tray, the number of optical fiber cable cores that can be inserted without increasing the number of welding units and housings. It is possible to increase the storage capacity to nearly double.

  In addition, since the first group of optical fiber cable cores and the second group of optical fiber cable cores are directly fused and connected in the fusion splicing tray, the number of jumper cords and cords with connectors can be reduced. It becomes possible to reduce. For this reason, it becomes possible to reduce a connection man-hour and to aim at reduction of cost. Furthermore, by reducing the number of jumper cords and cords with connectors, it is possible to reduce the number of connection points and suppress deterioration in transmission characteristics (to reduce loss).

Furthermore, the 1st surplus length accommodating part which accommodates the surplus length part of the optical fiber cable core wire which makes the 1st group, and the 2nd which accommodates the surplus length part of the optical fiber cable core wire which makes the 2nd group. The extra length accommodating portion is juxtaposed between the side portions on the back side in the direction of taking in and out, and the optical fiber cable core wires forming the first and second groups introduced from the one side portion are connected to the first extra portion. It guide | induces between a long accommodating part and the said 2nd surplus length accommodating part, and it draws out from the outside through the corresponding surplus length accommodating part from there, and the said in / out direction rather than the said 1st and 2nd surplus length accommodating part Since the butted portion is abutted at the front side and the abutted portion is fusion spliced , the optical fibers forming the first and second groups can be used even when the accommodation capacity in the fusion splicing tray is increased. Pull out the fusion splicing tray while ensuring the minimum bend radius of the cable core. It is possible to secure the drawer excess length for the tray.

  According to the optical fiber cable distribution board according to claim 2, the optical fiber cable core wire forming the first group and the optical fiber forming the second group even when the accommodation capacity in the fusion splicing tray is increased. The cable cores can be connected from one side without causing interference with each other, and the optical fiber cable core can be prevented from being damaged.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best embodiment of the present invention will be described below with reference to the accompanying drawings.

  In FIG. 1, an example of the configuration of an under-installation type optical fiber cable distribution board 1 is shown. This optical fiber cable distribution board 1 is provided with an opening / closing door (not shown) on the front surface of an accommodation frame 2. A fusion unit 4 is provided in the lower part of the connector, and a connector unit 6 is provided thereabove.

  The fusion unit 4 is configured by stacking a number of fusion connection trays 3 that can be inserted and removed individually in the front-rear direction. In each fusion splicing tray 3, a first group of optical fiber cable cores 7 led out from the optical fiber cable on the line side is drawn, and in some of the splicing splicing trays 3, The optical fiber cable core wire 15 forming the second group derived from the other optical fiber cable is also drawn in, and the optical fiber cable core wire forming the first group is connected to the jumper cord in the fusion connecting tray 3. 8 or a cord 9 with a connector, or a fusion-splicing connection with a second optical fiber cable core.

Among these, in FIG. 1B, the optical fiber cable core 7 and the second optical fiber cable core 15 forming the first group are drawn into the fusion splicing tray 3, and the optical fiber cable is drawn. A configuration in which the core wires are directly fused and connected is shown. That is, the first introduction port 16 and the second introduction port that allow introduction of the optical fiber cable core wire 7 forming the first group are provided on one side portion provided along the insertion / removal direction of the fusion splicing tray. A second introduction port 17 that enables introduction of a group of optical fiber cable cores 15 is provided, and a jumper cord 8 and a connector-attached cord 9 are introduced to the other side portion as necessary. For this purpose, third and fourth introduction ports 18 and 19 are provided. In the fusion splicing tray 3, a first surplus length that accommodates the surplus length portion 7 a of the optical fiber cable core wire 7 forming the first group in order to secure a surplus length for pulling out the tray. The accommodating portion 10 and the second surplus length accommodating portion 11 that accommodates the surplus length portion 15a of the second optical fiber cable core 15 are arranged between the side portions on the back side in the insertion / removal direction of the fusion splicing tray 3. Further, a fusion holder 12 that holds the fusion splicing portion is provided at the center portion on the front side (the front side in the direction of inserting and removing the fusion splicing tray 3) .

  Then, the optical fiber cable core wire 7 forming the first group is drawn from the first introduction port 16, and the optical fiber cable core wire 15 forming the second group is drawn from the second introduction port 17. The optical fiber cable core wire 7 and the second optical fiber cable core wire 15 are guided between the first surplus length accommodating portion 10 and the second surplus length accommodating portion 11, and then the light forming the first group. The surplus length portion 7a of the fiber cable core wire 7 is accommodated in the first surplus length accommodating portion 10, and the surplus length portion 15a of the optical fiber cable core wire 15 forming the second group is accommodated in the second surplus length accommodating portion. 11 to accommodate. Then, the first optical fiber cable core 7 and the second optical fiber cable core 15 are routed toward the fusion holder 12 from the outside of the corresponding extra-length accommodating portions 10 and 11, respectively, The fiber cable cores are abutted and fusion spliced, and the fusion spliced portion is fixed to the groove of the fusing holder 12.

  The accommodation structure of the fusion splicing tray 3 for fusion-connecting the optical fiber cable core wire 7 forming the first group and the jumper cord 8 or the cord 9 with connector is the same as the conventional accommodation structure. 3 (b), the optical fiber cable core wire 7 forming the first group is drawn from the introduction port 16 or 17 formed on one side of the fusion splicing tray 3, and The jumper cord 8 and the connector-attached cord 9 are drawn from the introduction port 18.19 formed on the other side of the fusion splicing tray 3, and the extra length 7a of the optical fiber cable core 7 is accommodated in the first extra length. The extra length portions 8a and 9a of the jumper cord 8 and the cord with connector 9 are accommodated in the second extra length accommodating portion 11, and the optical fiber cable 7 and the jumper cord 8 or connector are passed through these extra length accommodating portions. With Butt and code 9, so as to fix the fusion holder 12 are fused joining the butt portion

  The connector unit 6 also has a configuration similar to the previous configuration, and is configured by stacking a large number of connector trays 5 that can be inserted and removed individually in the front-rear direction. The cord with the connector on the outside of the station, which is fusion-bonded with the optical fiber cable core wire in the fusion connecting tray 3, is inserted from one side, and the cord with the connector on the inside of the station is inserted from the other side. The connectors of the cords with these connectors are connected via an adapter.

  In the above configuration, the case where the optical fiber cable core 15 forming the second group is added will be described in comparison with the conventional configuration. In the conventional configuration shown in FIG. When adding a wire (fiber optic cable core 15 forming the second group), it is necessary to secure a new fusion splicing tray 3 for inserting the added fiber optic cable core, A large amount of optical cords (jumper cords and cords with connectors) are necessary for connecting the optical fiber cable core wire 7 forming the first group and the optical fiber cable core wire 15 forming the second group. When the fusion splicing tray 3 is not sufficient, the housing frame 2 must be added or changed to a large optical switchboard. In addition, since a large amount of optical cords are required, there are inconveniences such as an increase in the number of connection points, an increase in work man-hours and costs, and a deterioration in transmission characteristics.

  On the other hand, in the configuration shown in FIG. 1, in some of the fusion splicing trays, the first group of optical fiber cable cores 7 and the second group of optical fiber cable cores 15 Are inserted from one side, and the first optical fiber cable core 7 and the second optical fiber cable core 15 are directly fused and connected in the fusion splicing tray. The jumper cord 8 and the connector-attached cord 9 are not required for the tray, and the space in the tray necessary for accommodating the jumper cord 8 and the connector-attached cord 9 is a second group of optical fiber cables. It becomes possible to utilize for the accommodation space which accommodates the extra length part 15a of the core wire 15. FIG. For this reason, even when a large amount of optical fiber cable cores (second optical fiber cable core wire 15) is added, it is possible to accommodate the welding unit 3 and the housing frame 2 without adding them. Therefore, it is possible to significantly increase (to nearly double) the capacity of the optical fiber cable core wire that can be inserted.

The first group of optical fiber cables 7 introduced from one side and the second group of optical fiber cables 15 are accommodated in the first extra length accommodating portion 10 and the second extra length. From the outside of the surplus length accommodating portion to the fusion halter 12, the optical fiber cable cores are guided in the vicinity of the fusion halter 12. Since the abutted wires are joined and the joined portions are fusion-spliced, an extra length for pulling out the fusion-connecting tray 3 is set in the tray while ensuring the minimum radius of curvature of the optical fiber cable cores 7 and 15. Can be secured.

  Furthermore, in this example, the optical fiber cable core wire 7 forming the first group is drawn through the first introduction port 16, and the optical fiber cable core wire 15 forming the second group is connected to the first introduction port. Is pulled in through another second introduction port 17, so that the existing tray can be used as it is, and the optical fiber cable cores 7 and 15 forming each group are physically installed in the introduction portion. Therefore, it is possible to prevent the optical fiber cable core from being damaged.

  In the above configuration example, the first introduction port 16 for introducing the first optical fiber cable core 7 and the second introduction port 17 for introducing the second optical fiber cable core 15 are separately provided. Although the example provided is shown, you may make it enter using the common inlet which formed the opening width large.

FIG. 1A is a schematic view showing the wiring state of an optical fiber cable distribution board according to the present invention, and FIG. 1B is a diagram of wiring in a fusion splicing tray used in FIG. It is an expansion schematic diagram showing a handling example. 2A and 2B are diagrams showing the overall configuration of the optical fiber cable distribution board, in which FIG. 2A is a front view, and FIG. 2B is a schematic cross-sectional view taken along the line AA in FIG. is there. FIG. 3A is a schematic view of the interior showing the conventional wiring state of the optical fiber cable distribution board, and FIG. 3B is an example of wiring in the fusion splicing tray used in FIG. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical fiber cable distribution board 2 Housing | casing frame 3 Tray for fusion splicing 4 Fusing unit 7 Optical fiber cable core wire which makes the 1st group 7a, 15a Surplus length part 10 1st surplus length accommodation part 11 2nd Extra length accommodating portion 15 Optical fiber cable core wire forming second group 16 First introduction port 17 Second introduction port

Claims (2)

A drawer-type fusion splicing tray that can be put in and out of the housing frame in the front-rear direction has a fusing unit that is stacked in multiple stages, and an optical fiber cable core is introduced into each of the splicing trays. In an optical fiber cable distribution board accommodated so as to be fusion spliced,
At least some of the fusion splicing trays are provided with a first group of optical fiber cable cores and a second group of optical fiber cable cores along the insertion / removal direction of the fusion splicing tray. Introduced from one side,
A first surplus length accommodating portion for accommodating a surplus length portion of the optical fiber cable core wire forming the first group in the fusion splicing tray; and an optical fiber cable core wire forming the second group. A second surplus length accommodating portion that accommodates the surplus length portion and provided side by side between the side portions on the back side in the loading / unloading direction;
The optical fiber cable core wires forming the first and second groups introduced from the one side are led between the first surplus length accommodating portion and the second surplus length accommodating portion, and from there It is routed from the outside through the corresponding surplus length accommodating portions, but is abutted at a portion closer to the front side of the first and second surplus length accommodating portions than the first and second surplus length accommodating portions, and the abutted portions are fused and connected. Optical fiber cable distribution board.   The optical fiber cable cores forming the first group are introduced through a first introduction port provided in the fusion splicing tray, and the optical fiber cable core wires forming the second group are 2. The optical fiber cable distribution board according to claim 1, wherein the optical fiber cable distribution board is introduced through a second introduction port different from the first introduction port provided in the fusion splicing tray.

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