JP4293619B2 - Cabinet with optical splitter - Google Patents

Description

  The present invention relates to a cabinet with an optical splitter that houses an optical splitter (optical distributor) that distributes a signal of one optical fiber in one trunk cable to a plurality of optical fibers of a plurality of branch cables. It is.

  The cabinet with an optical splitter is installed in, for example, an apartment house or a building in a state where a 1-input N-output (N ≧ 2) optical splitter is stored in advance. An intermediate portion of a trunk cable (for example, an outdoor cable) and an end portion of a branch cable (for example, an indoor cable) are drawn into the cabinet with an optical splitter.

  The intermediate portion of the trunk cable drawn into the cabinet with the optical splitter removes the jacket and exposes the core wire. Of the many optical fibers contained in this core, one optical fiber is cut and connected to the optical fiber on the input side of the optical splitter, but the other optical fibers are not cut and are moved inside the cabinet. Just pass through.

  Further, the end portion of each branch cable drawn into the cabinet with the optical splitter removes the jacket to expose the optical fiber. The optical fiber of this branch cable is connected to the output side optical fiber of the optical splitter. The number of optical fibers contained in one branch cable is usually one or two.

  Patent Document 1 discloses a technique for drawing a middle portion of a trunk cable and an end of a branch cable into a cabinet and connecting a part of the optical fiber on the trunk cable side and the optical fiber on the branch cable side in the cabinet. It is disclosed. However, this technique does not use an optical splitter, but connects the optical fiber on the main cable side and the optical fiber on the branch cable side on a one-to-one basis.

JP-A-10-332951

  In the cabinet with an optical splitter, the extra length of the core of the trunk cable, the extra length of the branch cable, the extra length of connection between the optical fiber of the trunk cable and the input side optical fiber of the optical splitter, and the optical fiber of the branch cable and the optical splitter It is necessary to store extra connection length with the output side optical fiber. There are also a large number of optical fibers and branch cables on the output side of the optical splitter. For this reason, the inside of a cabinet tends to be complicated with an optical cable and an optical fiber, and it becomes easy to interfere with the optical fiber connection work and extra length storage work.

  An object of the present invention is to provide a cabinet with an optical splitter capable of orderly storing an optical splitter, an extra length of a core cable, an extra length of a branch cable, and an extra length of each optical fiber in a narrow space.

  An object of the present invention is to provide an optical splitter that can easily connect the optical fiber of the added branch cable to the output side optical fiber of the optical splitter when the branch cable is sequentially added due to an increase in subscribers. The purpose is to provide an enclosed cabinet.

The cabinet with an optical splitter according to the present invention is a cabinet containing an optical splitter that distributes a signal of one optical fiber in a trunk cable to a plurality of optical fibers of a plurality of branch cables,
A front-opening cabinet body that is attached to the wall surface, an intermediate board that is attached to the back plate of the cabinet body via a spacer so that there is a gap between the back plate, and the vertical direction of the front of the intermediate board A tray stack attached to the intermediate portion, a branch cable holder attached to the upper front of the intermediate substrate, and a cover that covers the cabinet body,
The intermediate board has smaller vertical and horizontal dimensions than the back plate of the cabinet body, and there is an open space of the back plate that does not overlap with the intermediate board around the intermediate board,
A portion of the lower wall that closes the lower surface side of the cabinet body is provided with an introduction portion of a trunk cable in a portion corresponding to one of the left and right open spaces of the back plate, and a branch cable is provided in a portion corresponding to the other open space. The introduction of
The one open space and the gap near the open space between the back plate and the intermediate board are the main line side surplus length storage area for storing the surplus length of the core wire of the main cable introduced from the main cable introduction section. The other open space, and the gap near the open space between the back plate and the intermediate substrate is a branch-side surplus length that stores the surplus length of the branch cable introduced from the branch cable introduction portion. It is a storage area,
An optical splitter is housed in one tray of the tray stack, and one of the multiple optical fibers of the main cable and the input side optical fiber of the optical splitter is stored in the other tray. The optical fiber connection portion is accommodated, and the optical trays on the output side of the optical splitter are separately accommodated in one or a plurality of trays, and the plurality of trays are accommodated in the plurality of trays. When the optical fiber on the output side of the optical splitter and the optical fiber of the branch cable are connected, the connection portion is stored.
It is characterized by this.

  In the cabinet with an optical splitter according to the present invention, the tray stack is arranged in two groups on the left and right sides, and a connection portion between the tray for storing the optical splitter and the input side optical fiber of the optical splitter and the optical fiber of the trunk cable. It is preferable that two trays for storing the paper are arranged in the lowermost two layers of the tray stack near the main cable.

  In the cabinet with an optical splitter of the present invention, the left and right side walls of the cabinet body are cut out, and the extra length of the core wire and the extra length of the branch cable are respectively set from the side of the cabinet body. It is preferable that the storage area and the branch line side extra length storage area can be stored.

  Furthermore, in the cabinet with an optical splitter of the present invention, a holding member that holds the extra length of the core wire of the trunk cable is attached to the open space on the trunk cable side among the left and right open spaces on the back plate, and the open on the branch cable side is attached. It is preferable that a guide for guiding the branch cable to the open space above the back plate is attached to the space.

  Furthermore, in the cabinet with an optical splitter of the present invention, it is preferable that the back plate and the intermediate substrate of the cabinet body are made of metal plates. Furthermore, it is preferable that the lower wall of the cabinet body is also made of a metal plate.

  According to the present invention, the extra length of the core wire of the main line cable is the main line side constituted by the open space on the main line cable introduction part side of the back plate and the gap near the open space between the back plate and the intermediate board. It can be stored in the extra length storage area. Further, the surplus length of the branch cable can be stored in a branch line side surplus length storage area configured by an open space on the branch cable introduction portion side of the back plate and a gap near the open space between the back plate and the intermediate board. Therefore, the extra length of the core wire of the trunk cable and the extra length of the branch cable can be stored without overlapping. Moreover, the extra length of the core wire of the trunk cable stored in the trunk side surplus length storage area can be seen as an open space on the back panel, and the branch cable stored in the branch side surplus length storage area Since a part of the surplus length can be seen in the open space of the back plate, the storage state of the surplus length can be visually confirmed, and can be easily corrected when the storage state is not appropriate. When adding branch cables, store the extra length of the extra branch cable separately, or take out the extra length of the existing branch cable outside the cabinet and organize it including the extra length of the extra branch cable. The work of re-storing and storing can be easily performed.

  The optical splitter is stored in advance in one tray, and the connection portion between the input side optical fiber of the optical splitter and one optical fiber of the trunk cable is stored in another tray, and the output side optical fiber of the optical splitter. Is stored in a plurality of trays other than the above, separately in one or a plurality, so when connecting the optical fiber of the branch cable to the optical fiber on the output side of the optical splitter, the two trays are There is no need to open, and it is possible to perform the connection work by opening only the tray in which the output side optical fiber to be connected is stored. Therefore, when pulling in the branch cable and connecting the optical fiber and storing the extra length, you can work without worrying about the optical fiber of the optical splitter or trunk cable at all, and you can avoid accidents such as disconnection. Occurrence can be prevented in advance.

  FIG. 1 shows an embodiment of a cabinet with an optical splitter according to the present invention, and FIGS. 2 to 5 show components used in the cabinet of FIG. 6 to 8 show a state in which the optical splitter is accommodated in the cabinet of FIG. 1 and the trunk cable and the branch cable are introduced. In the figure, 10 is a cabinet body, and 12 is a cover that covers the cabinet body 10.

  The cabinet body 10 has a shallow box shape whose front is open when attached to a wall of a building. The cabinet body 10 has a back plate 14 attached to a wall of a building. Although walls 16a to 16d are provided on the four sides of the back plate 14, most of the top wall 16a and the left and right side walls 16b and 16d are cut out in order to improve workability. Therefore, the cover 12 is formed so as to cover the front surface, the upper surface, and the left and right side surfaces of the cabinet body 10. 1A and 1C, the cover 12 is depicted as being transparent (actually opaque), and FIG. 1B is depicted with the cover 12 largely omitted.

  The back plate 14 of the cabinet body 10 has a double structure in which metal plates are laminated inside a plastic back plate. This is for increasing the strength and facilitating the attachment of various parts. An intermediate substrate 18 is attached via a spacer 20 in front of the back plate 14. As a result, a gap corresponding to the height of the spacer 20 is formed between the back plate 14 and the intermediate substrate 18. Two sets of tray laminates 22L and 22R are separately provided on the left and right sides of the intermediate substrate 18 in the front vertical direction intermediate portion. Further, four branch cable holders 24 are attached to the upper front portion of the intermediate substrate 18, and one connector holder 26 is attached to the lower front portion.

  Each of the two sets of stacked trays 22L and 22R is obtained by providing a substantially square tray 28 as shown in FIG. 2 on the lowermost layer and laminating a plurality of substantially racket-shaped trays 30 as shown in FIG. . The lowermost tray 28 is fixed to the intermediate substrate 18, and the tray 30 above it is coupled to the lower tray 28 or 30 by a hinge coupling portion 32 and can be opened and closed. The trays 28 and 30 are general ones having a bottom plate 34, a peripheral wall 36, a winding drum 38, an optical fiber pop-out preventing piece 40, a connection portion holding portion 42 and the like. In this embodiment, the left tray stack 22L is a stack of five trays 30 on the tray 28, and the right tray stack 22R is a stack of four trays 30 on the tray 28. .

  The intermediate board 18 has smaller vertical and horizontal dimensions than the back board 14 of the cabinet body 10, and there are open spaces S 1, S 2, S 3, S 4 of the back board 14 that do not overlap the intermediate board 18 around the intermediate board 18. Yes.

  The lower wall 16c that closes the lower surface side of the cabinet body 10 is made of a metal plate. This is to make the inside of the cabinet difficult to be tampered with. An introduction portion 46 (see FIG. 1) of the trunk cable 44 (see FIGS. 6 and 7) is provided in a portion corresponding to the open space S2 on the left side of the back plate 14 on the left side of the lower wall 16c. An introduction portion 50 (see FIG. 1) of the branch cable 48 (see FIGS. 6 and 7) is provided in a portion corresponding to the open space S4 of the back plate 14 on the right side of the lower wall 16c.

  As shown in FIG. 1 (D), the trunk cable introduction part 46 is a U-shaped slot, and a trunk cable rubber packing 52 as shown in FIG. 4 is mounted in two stages. Yes. The rubber packing 52 has a hole 54 through which the main line cable passes and a notch 56 that reaches the hole 54 from the center of the upper end. Cable retainers 58 are provided in two stages inside the main line cable introduction portion 46.

  On the other hand, the branch cable introduction part 50 has a long and narrow opening through which a large number of branch cables can be passed, and a rubber packing 60 for branch cables as shown in FIG. The rubber packing 60 has a large number of holes 62 through which the branch cable passes, and notches 64 that reach the holes 62 from the side. Since the branch cable used here has a substantially cross-sectional shape of 8 as will be described later, the cross section of the hole 62 of the rubber packing 60 has an oval shape accordingly.

  A holding member 66 that holds the extra length of the core wire of the main cable 44 is attached to the open space S2 on the left side of the back plate 14. A guide 68 for guiding the branch cable 48 is attached to the upper part of the open space S4 on the right side of the back plate 14.

  As shown in FIG. 8, an optical splitter 70 is accommodated in the lowermost tray 28 of the tray stack 22L on the left side (main cable side). As shown in FIG. 9, this optical splitter 70 distributes the signal of one optical fiber 72 on the input side to 32 optical fibers 74 on the output side. In this embodiment, the case where the number of the optical fibers 74 on the output side is 32 will be described, but this number is not limited to this.

  For example, as shown in FIG. 10, the trunk cable 44 introduced into the cabinet body 10 includes a plurality of core wires 78 each having a plurality of optical fibers 76 arranged around the tension member 80, and a jacket 82. It is provided. The trunk cable 44 is usually an outdoor cable from a telephone office. Of the many optical fibers 76 included in the trunk cable 44, only one is connected to the input side optical fiber 72 of the optical splitter 70 in the cabinet body 10, and the other optical fibers pass through the cabinet. Only. The portion of the trunk cable 44 to be introduced into the cabinet body 10 peels off the jacket 82 without cutting the core wire 78 to expose the core wire 78 (see FIGS. 6 to 8).

  A rubber packing 52 as shown in FIG. 4 is attached to a portion where the jacket 82 is provided at both ends of the exposed portion of the core cable 44. The rubber packing 52 can be easily attached by opening the notch 56 in the rubber packing 52. The portion of the trunk cable 44 to which the rubber packing 52 is attached is pushed into the trunk cable introduction portion 46 of the cabinet body 10 and fixed. The tension member 80 of the trunk cable 44 is cut from the jacket end at an appropriate length, and the end is fixed to the cable retainer 58.

  Of the plurality of core wires 78 exposed by stripping the jacket 82 of the main cable 44, one core wire 78 is introduced into the second tray 30A of the left tray laminate 22L, in which light Only one fiber 76 is separated (see FIG. 8). The separated optical fiber 76 is cut there, and the cut end where the signal is transmitted is connected to the input side optical fiber 72 of the optical splitter 70 introduced from the lowermost tray 28 to the second layer tray 30A. Is done. The connecting portion 86 is housed in the connecting portion holding portion 42 (see FIG. 3) of the second-layer tray 30A.

  The extra length of the core wire 78 from which only one optical fiber 76 is separated is stored in the second-layer tray 30A. Further, the remaining length of the core wire 78 is rounded to the main line side constituted by the left side open space S2 of the back plate 14 and the gap near the open space S2 between the back plate 15 and the intermediate board 18. It is stored in the extra length storage area. The extra length of the rounded core wire 78 is held at a substantially predetermined position by the holding member 66. By doing so, the extra length of the core wire 78 does not interfere with the work, and a part of the core wire 78 looped in the open space S2 can be seen, so that the storage state can be visually confirmed. . As described above, one of the many optical fibers 76 included in the trunk cable 44 is connected to the input side optical fiber 72 of the optical splitter 70, but the other optical fibers are not cut. It only passes through the cabinet body 10.

  On the other hand, the 32 output side optical fibers 74 of the optical splitter 70 are first divided into 16 pieces. One of the 16 trays exits the lowermost tray 28 of the left tray laminate 22L and is divided into four, and four each on the third to sixth trays 30B to 30E of the same laminate 22L. Stored. The other 16 sheets exit the bottom layer tray 28 of the left side tray stack 22L and enter the bottom layer tray 28 of the right side tray stack 22R. Four trays are stored in the second to fifth trays 30A to 30D. That is, the extra lengths of the 32 output-side optical fibers 74 of the optical splitter 70 are divided into four pieces and stored in the left trays 30B to 30E and the right trays 30A to 30D (see FIG. 8). ).

  In addition, the branch cable 48 introduced into the cabinet body 10 has, for example, as shown in FIG. 11, a parallel-shaped two optical fibers 88 with a sheath 92 having a letter-shaped section 8 through a tensile strength fiber layer 90. It has been applied. The branch cable 48 is an indoor cable that is wired in a section from a cabinet with an optical splitter to a subscriber's house, for example, in an apartment house. The branch cable 48 can be separated into two optical cables by tearing the jacket 92 along the central connecting portion. Only one optical fiber is actually used, and the other optical fiber is a spare.

  The branch cable 48 is introduced into the cabinet body 10 through a rubber packing 60 installed in the branch cable introduction section 50. In order to pass the branch cable 48 through the rubber packing 60, it is only necessary to push the branch cable 48 into the hole 62 from the notch 64 on the side surface of the rubber packing 60. Thirty-one holes 62 are formed in the rubber packing 60 so that up to 31 branch cables 38 can be passed therethrough.

  The branch cable 48 introduced into the cabinet body 10 is split into two branch cables 48A and 48B by cutting the jacket 92, and one of the branch cables 48A passes through the guide 68 into the upper open space S1 of the back plate 14. Then, the outer sheath and the tensile fiber layer on the tip side are removed, and the optical fiber 88 is exposed for a required length. The branch cable 48 </ b> A from which the outer jacket on the distal end side is removed causes the branch cable holder 24 to hold the vicinity of the end of the jacket. The branch cable holder 24 has a groove for holding the branch cable, and the branch cable can be held only by pushing the branch cable 48A into the groove. Eight grooves are formed in one branch cable holder 24 so that up to eight branch cables can be held. The optical fiber 88 exposed by peeling off the jacket was connected to a predetermined output side optical fiber 74 of the optical splitter 70, and the connection portion 94 and the connection extra length accommodated the output side optical fiber 74 of the connection partner. Stored in a tray.

  In addition, the other branch cable 48B that is cut off and separated from the outer jacket 92 is rounded, and the right open space S4 of the back plate 14 and the gap between the back plate 15 and the intermediate substrate 18 near the open space S4. Are stored in a branch line side surplus length storage area. In this way, the extra length of the branch cable 48B does not interfere with the work, and a part of the branch cable 48B can be seen in the open space S4, so that the storage state can be confirmed visually.

  Of the 32 output-side optical fibers 74 of the optical splitter 70, one optical fiber 74M (in the example shown, one of the four accommodated in the uppermost tray 30D of the right-side tray stack 22R). This) is used as a monitor for confirming whether or not the optical splitter 70 is operating normally. Therefore, up to 31 branch cables can be connected to the optical splitter 70. A connector 96 is attached to the end of the optical fiber 74M for monitoring. The connector 96 is fitted to one end side of a connector adapter 98 (see FIG. 6) fixed to the connector holder 26 (see FIG. 1B). If a connector on the monitor device side is fitted to the other end side of the connector adapter 98, it can be confirmed whether or not an optical signal is output from the optical splitter 70.

1A is a plan view, FIG. 1B is a front view, FIG. 1C is a side view, and FIG. 1A and 1B show one type of tray used in the cabinet with an optical splitter in FIG. 1, (A) is a front view, (B) is a left side view, (C) is a right side view, and (D) is a bottom view. 1A shows another type of tray used in the cabinet with the optical splitter in FIG. 1, (A) is a plan view, (B) is a front view, (C) is a left side view, (D) is a right side view, E) is a bottom view. The rubber cable packing for trunk cables used for the cabinet with an optical splitter of FIG. 1 is shown, (A) is a plan view, (B) is a front view, (C) is a sectional view taken along the line CC of (B), (D). Is a right side view, (E) is a cross-sectional view taken along line EE of (D). The rubber packing for branch cable used for the cabinet with an optical splitter of FIG. 1 is shown, (A) is a top view, (B) is a front view, (C) is a left side view, (D) is a right side view. The front view which shows the state which introduced the trunk line cable and the branch line cable into the cabinet main body of the cabinet with an optical splitter of FIG. (A) is the sectional view on the AA line of FIG. 6, (B) is the sectional view on the BB line of FIG. The expanded view which shows the connection state of the optical splitter in the cabinet with an optical splitter of FIG. 1, the optical fiber of a trunk line cable, and the optical fiber of a branch line cable. The top view which shows an example of an optical splitter. Sectional drawing which shows an example of a trunk line cable. Sectional drawing which shows an example of a branch line cable.

Explanation of symbols

10: Cabinet body 12: Cover 14: Back plates 16a to 16d: Peripheral wall 18: Intermediate substrate 20: Spacers S1 to S4: Open space 22L, 22R of the back plate 14: Tray stack 24: Branch cable holder 26: Connector holder 28 30: Tray 32: Hinge coupling portion 44: Trunk cable 46: Trunk cable introduction portion 48: Branch cable 50: Branch cable introduction portion 52: Trunk cable rubber packing 58: Cable retainer 60: Branch cable rubber packing 66: Holding member 68: Guide 70: Optical splitter 72: Input side optical fiber 74: Output side optical fiber 76: Main fiber optical fiber 78: Main cable core 86: Optical fiber connector 88: Branch cable optical fiber 94: Optical fiber connection part 96: Connector 98: Connector adapter

Claims (6)

A cabinet containing an optical splitter that distributes a signal of one optical fiber in a trunk cable to a plurality of optical fibers of a plurality of branch cables,
A front-opening cabinet body that is attached to the wall surface, an intermediate board that is attached to the back plate of the cabinet body via a spacer so that there is a gap between the back plate, and the vertical direction of the front of the intermediate board A tray stack attached to the intermediate portion, a branch cable holder attached to the upper front of the intermediate substrate, and a cover that covers the cabinet body,
The intermediate board has smaller vertical and horizontal dimensions than the back plate of the cabinet body, and there is an open space of the back plate that does not overlap with the intermediate board around the intermediate board,
A portion of the lower wall that closes the lower surface side of the cabinet body is provided with an introduction portion of a trunk cable in a portion corresponding to one of the left and right open spaces of the back plate, and a branch cable is provided in a portion corresponding to the other open space. The introduction of
The one open space and the gap near the open space between the back plate and the intermediate board are the main line side surplus length storage area for storing the surplus length of the core wire of the main cable introduced from the main cable introduction section. The other open space, and the gap near the open space between the back plate and the intermediate substrate is a branch-side surplus length that stores the surplus length of the branch cable introduced from the branch cable introduction portion. It is a storage area,
An optical splitter is accommodated in one tray of the tray stack, and a connection portion between the input side optical fiber of the optical splitter and at least one optical fiber of the trunk cable is included in the other tray. The optical fibers on the output side of the optical splitter are stored separately in one or more in each of the plurality of trays, and the output side of the optical splitter is stored in the plurality of trays. When the optical fiber and the optical fiber of the branch cable are connected, the connection part is stored.
A cabinet with an optical splitter.   2. The cabinet with an optical splitter according to claim 1, wherein the tray stack is arranged in two groups on the left and right, a tray for storing the optical splitter, an optical fiber on the input side of the optical splitter, and an optical fiber on the trunk cable The cabinet containing the optical splitter is characterized in that two trays for storing the connection portion are arranged in the bottom two layers of the tray stack near the main cable.   The cabinet with an optical splitter according to claim 1 or 2, wherein the cabinet body has left and right side walls cut away, and the extra length of the core wire of the trunk cable and the extra length of the branch cable from the side of the cabinet body. An optical splitter-containing cabinet characterized in that it can be stored in a main line side surplus length storage area and a branch line side surplus length storage area.   The cabinet with an optical splitter according to any one of claims 1 to 3, wherein a holding member that holds an extra length of a core wire of the trunk cable in the open space on the trunk cable side among the left and right open spaces of the back plate. And a guide for guiding the branch cable to the open space above the back plate is installed in the open space on the branch cable side.   The cabinet with an optical splitter according to any one of claims 1 to 4, wherein the back plate and the intermediate substrate of the cabinet body are made of a metal plate.   6. The cabinet with an optical splitter according to claim 5, wherein the lower wall of the cabinet body is made of a metal plate.

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