JP5063376B2 - Fiber optic cable distribution board - Google Patents

Description

  The present invention relates to an optical fiber cable distribution board having drawer-type trays stacked in multiple stages on a housing frame.

  An optical fiber cable distribution board is generally used as a device that can be connected between optical fiber cables or between an optical fiber cable and a transmission device. In such an optical fiber cable distribution board, Drawer trays stacked in multiple stages are provided.

  As such an optical fiber cable distribution board, as shown in Non-Patent Document 1, a fusion unit in which fusion splicing trays 3 in the housing frame are stacked in multiple stages, and a connector tray in multiple stages. The optical fiber cable core wire on the line side introduced from below is drawn into each fusion splicing tray, and this optical fiber cable core wire is connected to another optical fiber via a jumper wire. It is connected to the cable core or led to the connector unit via a cord with a connector.

  The optical fiber cable core wire drawn into each fusion splicing tray is drawn from one side of the splicing splicing tray, and the jumper wire and the cord with connector are connected to the other side of the splicing splicing tray. In the inside of the fusion splicing tray, the first extra length accommodating portion for accommodating the extra length portion of the optical fiber cable core and the second extra length portion for accommodating the jumper wire or the cord with the connector are accommodated. The extra length accommodating portion is provided, and the optical fiber cable core wire and the jumper wire or the cord with the connector are abutted through the extra length accommodating portion, and the abutting portion is fused and fixed to the fusion holder. ing.

  However, in the configuration described above, since the optical fiber cable core of the access system is inserted from one side, when a new optical fiber cable core is added, a new one is added each time it is added. A fusion splicing tray is required, and jumper wires and cords with connectors need to be added as the number of splicing trays increases.

  For this reason, a large amount of fusion splicing trays are required, and a large amount of optical cords (jumper wires and cords with connectors) that are fusion spliced to the optical fiber cable cores are required. In addition, since the transmission characteristics deteriorate due to an increase in the number of connection points, the present applicant has previously proposed a configuration that eliminates these disadvantages (see Patent Document 1).

This includes a first extra length accommodating portion for accommodating an extra length portion of the optical fiber cable core wire forming the first group, and an optical fiber forming the second group in a drawer type tray stacked in multiple stages on the upper and lower sides. A second extra length accommodating portion for accommodating an extra length portion of the cable core, and an optical fiber cable core forming the first group and an optical fiber cable core forming the second group on one side. The first and second optical fiber cable cores are introduced between the first surplus length accommodating portion and the second surplus length accommodating portion, and then butt through the corresponding surplus length accommodating portions. The abutted portion is fusion spliced.
“Instruction Manual for Optical Fiber Cable Board”, MUS-H-024, Shoden Co., Ltd., May 2001, p1-9 JP 2006-276085 A

  However, in the above-described configuration, the capacity of the optical fiber cable core can be increased without adding a fusion splicing tray or housing frame, and the number of jumper wires or cords with connectors can be reduced to reduce the work man-hours and While it is possible to reduce costs and reduce the connection characteristics by reducing the number of connection points (to reduce loss), it is still necessary to use a conventional connection method using jumper wires to connect another tray. Therefore, there is a limit to reducing the number of cords to reduce the connection man-hours and costs.

  The present invention has been made in view of the circumstances described above, and eliminates jumper wires to reduce connection man-hours and costs, and further reduces the number of connection points to further suppress deterioration in transmission characteristics (to further reduce loss). The main object is to provide an optical fiber cable distribution board that can be used.

In order to achieve the above object, an optical fiber cable distribution board according to the present invention includes a first drawer tray stacked in a plurality of stages on the housing frame and a second drawer stacked in a plurality of stages on the top and bottom. An optical fiber cable core having a first tray and a space provided between the first drawer tray and the second drawer tray, and forming a first group in the first drawer tray. A first surplus length accommodating portion that accommodates the surplus length portion; and a connecting portion that connects the optical fiber cable core wire forming the first group and another optical fiber cable core wire; and Providing a second extra length accommodating portion for accommodating the extra length portion of the optical fiber cable core wire forming the second group in the drawer type tray;
The optical fiber cable cores forming the first group are introduced into the first pull-out tray from the outer side and guided to the connecting portion through the first extra length accommodating portion, and the second An optical fiber cable core forming a group is introduced into the second pull-out tray from the outer side portion and led out from the side portion on the space portion side to the space portion through the second extra length accommodating portion. In addition, the optical fiber cable core wire forming the first group and the second group are introduced from the space part to the first pull-out tray from the side part on the space part side and guided to the connection part. And the second optical fiber cable core wire is introduced into the first pull-out tray after securing a pull-out surplus length in the space portion, A cylindrical shape that passes the second optical fiber cable core in the space or A surplus length duct is provided, and the withdrawal surplus length is obtained by bending the second optical fiber cable core wire through the surplus length duct and then bending it back, and from the rear end of the surplus length duct. The second optical fiber cable core is formed by projecting a bent-back portion.

  Therefore, when connecting the first drawer-type tray and the second drawer-type tray, the second optical fiber cable core wire accommodated in the second drawer-type tray is connected to the first drawer via the space portion. Since the introduced second optical fiber cable core wire is connected to the first optical fiber cable core wire and the connection portion in the first pull-out tray, no jumper wire is required. In addition, the first optical fiber cable core and the second optical fiber cable core can be connected by a single connection operation.

Here, as a structure for securing the extra length in the space portion, a core wire corresponding to the extra length of the drawer may be simply suspended. However, in the present invention, the second optical fiber cable core wire is provided in the space portion. A tubular or grooved extra length duct is provided, and the withdrawal extra length is bent again after the second optical fiber cable core is put in the extra duct, and the rear end of the extra duct Since the bent-back portion of the second optical fiber cable core wire is protruded from the portion, it becomes possible to prevent the extra length portions of the stacked drawer-type trays from interfering with each other. Note that the rear end portion of the extra length duct may be bent downward.

Moreover, the optical fiber cable distribution board according to the present invention has a first drawer-type tray stacked in a plurality of stages on the housing frame and a second drawer-type tray stacked in a plurality of stages on the top and bottom. A space is provided between the first drawer-type tray and the second drawer-type tray, and an extra length portion of the optical fiber cable cores forming the first group is accommodated in the first drawer-type tray. A first extra length accommodating portion, and a connection portion for connecting the optical fiber cable core wire forming the first group and another optical fiber cable core wire, and a second pull-out tray has a second portion. A second extra length accommodating portion for accommodating an extra length portion of the optical fiber cable cores forming the group of the optical fiber cable cores, and connecting the optical fiber cable core wires forming the first group to the first pull-out tray on the outer side And introduced to the connecting part through the first extra length accommodating part, An optical fiber cable core wire forming a second group is introduced into the second drawer-type tray from an outer side portion, and the space portion is inserted from the side portion on the space portion side through the second extra length accommodating portion. To the first pull-out tray from the space portion and introduced to the connection portion from the side portion on the space portion side, and the optical fiber cable core wire forming the first group and the second And connecting the second optical fiber cable core wire to the first drawer-type tray after securing a pull-out surplus length in the space portion. And a first extra length duct that runs around the second optical fiber cable core wire led out from the second pull-out tray, and is provided below the first extra length duct and the first extra length duct. The second formed longer than this along the long duct A long duct, and the second optical fiber cable core wire is bent over the first extra length duct and then turned back into the second extra length duct, and the extra length of the lead is You may make it form in the transition part from one surplus length duct to the said 2nd surplus length duct.

In such a configuration, the width of the second extra length duct is formed wider than the width of the first extra length duct, and the width of the second extra length duct and the width of the first extra length duct are the same. It is preferable that the difference from the width is greater than the width of the second optical cable core.

  As described above, according to the present invention, when the first drawer-type tray and the second drawer-type tray are connected, the second optical fiber cable core housed in the second drawer-type tray is connected. Is introduced into the first pull-out tray through the space, and the introduced second optical fiber cable core is directly connected to the first optical fiber cable core in the first pull-out tray. As a result, no jumper wires are required, and it is possible to connect the first optical fiber cable core and the second optical fiber cable core in a single connection operation, eliminating the jumper wires. Man-hours and costs can be reduced. In addition, since the number of connection points can be further reduced as compared with the conventional configuration, it is possible to further suppress the deterioration of transmission characteristics (further reduce loss).

  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. The first unit 3 is provided on the inner left side, and the second unit 4 is provided on the inner right side.

  The first unit 3 is configured by stacking a number of first drawer-type trays 5 that can be inserted and removed individually in the front-rear direction. In addition, the second unit 4 is configured by stacking a number of second pull-out trays 6 that can be taken in and out individually in the front-rear direction.

  A space 7 having a predetermined width is provided between the first unit and the second unit. Therefore, the first drawer-type tray 5 and the second drawer-type tray 6 are arranged with the space 7 therebetween. Has been.

  In the first pull-out tray 5, the optical fiber cable core wires 8 forming the first group led out from the optical fiber cable on the line side are drawn from the outer side portion and led out from other optical fiber cables, which will be described later. The optical fiber cable core wire 9 forming the second group is drawn from the side portion on the space side, and the optical fiber cable core wire 8 forming the first group and the second light are placed in the first pull-out tray. The fiber cable core 9 is fused and connected.

  That is, the first pull-out tray 5 is provided with a first introduction port 11 on the outer side portion through which the optical fiber cable core wire 8 forming the first group can be introduced, and the second group. The second introduction port 12 enabling the introduction of the optical fiber cable core wire 9 forming the following is provided in the side portion on the space portion side, and the extra length portion of the optical fiber cable core wire 8 forming the first group is provided inside. A first extra length accommodating portion 13 for accommodating 8a is provided on the back side in the drawing direction, and a fusion holder 14 for holding the fusion splicing portion is provided on the near side in the drawing direction.

  On the other hand, in the second pull-out tray 6, the optical fiber cable cores 9 forming the second group led out from the optical fiber cable on the line side are drawn from the outer side, and the drawn second The optical fiber cable core wire 9 forming the group is drawn out from the side portion on the space portion side to the space portion 7.

  That is, the second drawer-type tray 6 is provided with a third introduction port 15 on the outer side portion through which the optical fiber cable core wire 9 forming the second group can be introduced, and the second group A lead-out port 16 through which the optical fiber cable core wire 9 forming the optical fiber cable 9 can be led out is provided in the side portion on the space portion side, and the extra length portion 9a of the optical fiber cable core wire 9 forming the second group is accommodated therein. The second surplus length accommodating portion 17 is provided on the back side in the drawing direction.

  In this example, the first drawer-type tray 5 and the second drawer-type tray 6 have the same depth, but the first drawer-type tray 5 has a fusion holder 14 that holds a connection portion. Since it is provided, the lateral width of the first drawer-type tray 5 is formed larger than the lateral width of the second drawer-type tray 6.

  Then, the optical fiber cable core wire 8 forming the first group is drawn into the first pull-out tray 5 from the first introduction port 11 and drawn from the space portion side to the first extra length accommodating portion 13. The surplus length portion 8a of the optical fiber cable core wire 8 forming the group 1 is accommodated in the first surplus length accommodating portion 13 and drawn from the outside of the surplus length accommodating portion 13 toward the fusion holder 14 (connecting portion). . Further, the optical fiber cable core wire 9 forming the second group is drawn into the second pull-out tray 6 from the third introduction port 15, and is routed from the space portion side to the second extra length accommodating portion 17, The surplus length portion 9a of the optical fiber cable cores 9 forming the group 2 is accommodated in the second surplus length accommodating portion 17, and is routed from the outside of the surplus length accommodating portion 17 toward the outlet port 16, and from the outlet port 16 After being drawn out into the space portion 7, it is drawn into the first pull-out tray 5 from the second introduction port 12 and drawn toward the fusion holder 14 (connection portion). Then, the first optical fiber cable core wire 8 and the second optical fiber cable core wire 9 are fusion-bonded by abutting each other of the optical fiber cable core wires, and the fusion-connected connection portion is connected to the fusion holder. 14 is fixed to the groove.

At this time, the second optical fiber cable core wire 9 is introduced into the first drawer-type tray 5 after securing the extra length in the space portion 7. That is, in this example, a pair of guide pins 20 that hold the second optical fiber cable core wire 9 are arranged in the space portion 7 in the horizontal direction at a predetermined interval, and the second light is interposed between the guide pins 20. The fiber cable core wire 9 is pulled out and hung down in anticipation of a length capable of securing a surplus length.
The optical fiber cable core 9 can be connected not only between the first drawer-type tray 5 and the second drawer-type tray 6 having the same number of stages but also between trays having different stages. Yes.

  In the above configuration, the first drawer-type tray 5 is provided with the extra length accommodating portion 13 for accommodating the extra length of the first optical fiber cable core 8 and connected to the second optical fiber cable core 9. A fusion holder 14 for holding the cable, and an extra length accommodating portion 17 for accommodating the extra length of the second optical fiber cable core 9 is provided in the second pull-out tray 6, and is drawn out from the second pull-out tray 6. The drawn second optical fiber cable core 9 is introduced into the first pull-out tray 5 after securing the extra length in the space portion 7, and the first optical fiber is introduced into the first pull-out tray 5. Since the cable core 8 is directly fused and connected, no jumper wires are required when connecting different drawer trays, and different optical fiber cable cores can be connected by a single fusion operation. It becomes.

  Further, a space portion 7 is provided between the first drawer-type tray 5 and the second drawer-type tray 6, and an extra length for pulling out the drawer-type tray is secured in the space portion 7. It becomes possible to make the structure in the drawer-type tray compact.

In addition, as a structure which secures the drawer | drawer surplus length in the space part 7, it is preferable to devise for preventing that the surplus drawer | drawer-length part distribute | arranged multistage up and down physically contacts and is damaged.
For example, the first drawer-type tray 5 will be described. As shown in FIG. 2, a cylindrical extra length duct 21 is fixed to the side of the unit main body 22 that accommodates the first drawer-type tray 5. The second optical fiber cable core wire 9 drawn out from the two drawer-type trays 6 to the space 7 is inserted from the front end opening 21a of the extra-length duct 21, pulled out from the rear end opening 21b, and bent back. The extra length duct 21 is inserted again through the end opening 21b, pulled out from the front end opening 21a, and is pulled out from the second inlet 12 through the slit 23 formed in the side of the unit body 22 on the space side. You may make it introduce into the 1st drawer-type tray 5. FIG.

  Further, the rear end portion of the extra length duct 21 is bent somewhat downward, and the second optical fiber cable core 9 smoothly hangs obliquely downward, and interferes with the lower second optical fiber cable core 9. Try to avoid. The length of the second optical fiber cable core 9 drawn from the rear end opening 21b of the extra length duct 21 (the length from the rear end opening 21b of the extra length duct 21 to the bent-back portion 9b) is the first. When the drawer length of the drawer-type tray 5 is L, a length of L / 2 or more is secured to prevent bending of the optical fiber cable core.

  The extra length duct 21 is provided along the upper side of the unit main body 22 that accommodates each drawer-type tray, and the bent portion of the rear end portion of the extra length duct 21 falls within the height range of the unit main body 22. It has become.

  It should be noted that the fiber optic cable cores that run from the front to the rear of the part of the second fiber optic cable core 9 that feeds the extra length duct 21 do not move to the extra length duct 21 with a core tape. It may be fixed or clamped with a clamp 25 (indicated by a dashed line in the figure).

  In such a configuration, even if the first drawer-type tray 5 is pulled out, the pull-out surplus length portion that is pulled out behind the surplus length duct 21 does not reach the rear end of the surplus length duct 21. The fiber cable cores will not be bent, and the upper and lower optical fiber cable cores (extracted extra length portions arranged in multiple stages above and below) will not be physically contacted and damaged.

  In the above-described example of the extra length duct 21, the bent portion of the extra length duct 21 is provided along the upper side of the unit main body 22 so as to be within the range of the height of the unit main body 22 that accommodates the drawer-type tray. Therefore, there is an advantage that the extra length duct 21 is not inconvenienced when the tray is added. However, as shown in FIG. 3, the extra length duct 21 is provided along the lower side of the unit main body 22. May be. Moreover, although the case where the extra length duct 21 was formed in a cylindrical shape as shown in FIG. 4A was shown, it is formed in a groove shape with an open top as shown in FIG. 4B. You may make it do.

  Further, as shown in FIG. 5, a first extra length duct 31 passing the second optical fiber cable core 9 led out from the second pull-out tray 6, and the first extra length duct 31. A second extra length duct 32 that is bent toward the second inlet 12 so as to be bent back and introduced into the first pull-out tray 5 is provided separately. May be.

  For example, in the example shown in FIG. 5, a groove-shaped first extra length duct 31 having an open upper portion is provided at an intermediate height on the side portion of the unit main body 22 that houses the first pull-out tray 5. A groove-shaped second extra length duct 32 having an open top is provided along the lower side of the unit main body 22, and the second extra length duct 32 is made longer than the first extra length duct 31 to make the second extra length. The long duct 32 is protruded rearward from the first extra length duct 31, and the width of the second extra length duct 32 is formed wider than the width of the first extra length duct 31. . The difference (N) between the width of the second extra length duct 32 and the width of the first extra length duct 31 is greater than the width of the second optical fiber cable core 9. And the drawer surplus length is formed in the transition part from the 1st surplus length duct 31 to the 2nd surplus length duct 32. In particular, in the example shown in FIG. 5, a length of more than half (L / 2) of the pull-out length L of the first pull-out tray 5 is secured behind the second surplus-length duct 32 to secure a pull-out surplus length. Like to do.

  In such a configuration, even if the drawer-type tray 5 is pulled out, the bent-back portion 9b that is pulled out behind the second extra length duct 32 is only shortened so as to be accommodated in the second extra length duct 32. Therefore (see FIG. 5B), the optical fiber cable core 9 is not bent and the upper and lower optical fiber cable cores (extra extra length portions arranged in multiple stages above and below) are physically It will not be damaged by touching.

  Further, since the extra length duct is divided into the first extra length duct and the second extra length duct, the wiring work can be easily performed, and the width of the second extra length duct 32 Since the difference (N) in the width from the first extra length duct 31 is greater than the width of the second optical fiber cable core 9, the optical fiber cable core 9 to the second extra length duct 32 is formed. This wiring is not obstructed by the first extra length duct 31, and the attachment work can be easily performed.

  In the second extra length duct 32, the length (M) projecting rearward from the first extra length duct 31 is not less than half (L / 2) of the drawer length L of the first drawer type tray 5. If the length can be ensured, it is not necessary to secure the extra length of the drawer further behind the second extra length duct 32. In such a configuration, as shown in FIG. 6, the rear end of the second extra length duct 32 may be closed, and the depth of the drawer-type tray is the same as that of the first extra length duct 31. If there are M or more from the rear end, it is not necessary to project the extra length ducts 31 and 32 rearward from the pull-out tray 5 as shown in FIG.

  In the above configuration, the first drawer-type tray 5 is provided with the extra-length ducts 21, 31, 32. However, the second drawer-type tray 6 is similarly provided with the extra-length duct. It may be.

  Moreover, although the above structure showed the example which ensures the drawer extra length in the space part 7, as a structure which provides the drawer extra length in the 2nd optical fiber cable core wire 9, as shown in FIG. You may make it ensure the drawer extra length inside the 2nd drawer-type tray 6. FIG. In other words, the rear portion of the second drawer-type tray 6 protrudes rearward from the unit main body 40 and is provided with a drawer surplus length accommodating portion 41 bent downward, and the second optical fiber is provided inside the surplus drawer length accommodating portion 41. The cable core wire 9 may be routed to secure the extra length of the drawer. The drawer excess length accommodating portion 41 bent downward functions as a stopper by contacting the frame of the unit main body 40 when the second drawer type tray 6 is pushed forward. An opening / closing cover 42 is provided on the door, and this portion is removed to enable maintenance.

  In such a configuration, even if the first or second pull-out trays 5 and 6 are pulled out, the extra length in the second pull-out tray 6 only expands and contracts, and the optical fiber cable core 9 Will not be bent, and the upper and lower optical fiber cable cores (extracted extra length portions arranged in multiple stages above and below) will not be physically touched and damaged.

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 illustrating first and second drawer trays used in FIG. FIG. 2 is an enlarged schematic view showing an example of the wiring of FIG. 1 and is a view seen from the line AA in FIG. 2A and 2B are diagrams showing a configuration example in which a surplus length duct for securing a surplus drawer length is provided in the space portion. FIG. 2A is a perspective view thereof, and FIG. 2B is a side view thereof. FIG. 3 is a side view showing another configuration example in which an extra length duct is provided. FIG. 4 is a perspective view showing a configuration example of the extra length duct. FIG. 5 is a diagram showing a configuration example in which groove-shaped first and second extra-length ducts are directed in order to secure a drawer extra length in the space portion, (a) is a perspective view thereof, and (b) is a perspective view thereof. Is a side view thereof, and FIG. 6A and 6B are diagrams showing a modification of the configuration shown in FIG. 5. FIG. 6A is a perspective view thereof, and FIG. 6B is a side view thereof. FIG. 7 is a side view showing another modification of the configuration shown in FIG. FIG. 8 is a view showing a configuration example for securing the extra drawer length in the second drawer-type tray, (a) is a perspective view showing a state before taking out the drawer-type tray, and (b). FIG. 4 is a perspective view showing a state after the drawer-type tray is taken out, and FIG. 3C is a side view showing a state before and after taking out the drawer-type tray.

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 1st drawer type tray 6 2nd drawer type tray 7 Space part 8 1st optical fiber cable core wire 9 2nd optical fiber cable core wire 9b Bending part 13 1st extra length accommodating part 17 2nd 14 extra length accommodating portion 14 fusion holder 21 extra length duct 31 first extra length duct 32 second extra length duct

Claims (4)

A first drawer-type tray stacked in a plurality of stages on the housing frame and a second drawer-type tray stacked in a plurality of stages on the top and bottom;
Providing a space between the first drawer-type tray and the second drawer-type tray;
A first surplus length accommodating portion for accommodating a surplus length portion of the first group of optical fiber cable core wires in the first pull-out tray; an optical fiber cable core wire forming the first group; A connecting portion for connecting the optical fiber cable core wire,
A second extra length accommodating portion for accommodating the extra length portion of the optical fiber cable core wire forming the second group in the second pull-out tray;
Introducing the first group of optical fiber cable core wires from the outer side into the first pull-out tray and guiding them to the connecting portion via the first extra length accommodating portion;
The optical fiber cable core wires forming the second group are introduced into the second pull-out tray from the outer side portion, and the space is formed from the side portion on the space portion side through the second extra length accommodating portion. Leading to the connection portion by introducing from the side portion on the space portion side to the first pull-out tray from the space portion,
Connecting the optical fiber cable cores forming the first group and the optical fiber cable cores forming the second group at the connection portion ;
The second optical fiber cable core wire is introduced into the first pull-out tray after securing a pull-out surplus length in the space portion,
A cylindrical or groove-shaped surplus duct that passes the second optical fiber cable core is provided in the space, and the withdrawal surplus is provided with the second optical fiber cable core connected to the surplus duct. An optical fiber cable distribution board formed by bending and bending again and projecting a bent portion of the second optical fiber cable core from the rear end of the extra length duct . The optical fiber cable distribution board according to claim 1, wherein a rear end portion of the extra length duct is bent downward. A first drawer-type tray stacked in a plurality of stages on the housing frame and a second drawer-type tray stacked in a plurality of stages on the top and bottom;
Providing a space between the first drawer-type tray and the second drawer-type tray;
A first surplus length accommodating portion for accommodating a surplus length portion of the first group of optical fiber cable core wires in the first pull-out tray; an optical fiber cable core wire forming the first group; A connecting portion for connecting the optical fiber cable core wire,
A second extra length accommodating portion for accommodating the extra length portion of the optical fiber cable core wire forming the second group in the second pull-out tray;
Introducing the first group of optical fiber cable core wires from the outer side into the first pull-out tray and guiding them to the connecting portion via the first extra length accommodating portion;
The optical fiber cable core wires forming the second group are introduced into the second pull-out tray from the outer side portion, and the space is formed from the side portion on the space portion side through the second extra length accommodating portion. Leading to the connection portion by introducing from the side portion on the space portion side to the first pull-out tray from the space portion,
Connecting the optical fiber cable cores forming the first group and the optical fiber cable cores forming the second group at the connection portion;
The second optical fiber cable core wire is introduced into the first pull-out tray after securing a pull-out surplus length in the space portion,
A first extra-length duct extending around the second optical fiber cable core led out from the second pull-out tray; and the first extra-length duct provided below the first extra-length duct A second extra length duct formed longer than the second extra length duct, and bending the second optical fiber cable core around the first extra length duct, and then bending the second extra length duct. An optical fiber cable wiring board characterized by being formed in a transition portion from the first surplus length duct to the second surplus length duct along the long duct. The width of the second extra length duct is formed wider than the width of the first extra length duct, and the difference between the width of the second extra length duct and the width of the first extra length duct is: 4. The optical fiber cable wiring board according to claim 3, wherein the optical fiber cable wiring board is formed to have a width greater than that of the second optical cable core.

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