JPH0414520B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an optical fiber communication system.
This invention relates to an optical fiber cable distribution rack that separates connections between subscriber lines and terminal equipment installed in a central office building.

Normally, the handling conditions for optical fiber cords differ from those for copper wire cords in the following points. That is,
In order to prevent breakage, mode conversion, and loss increase, the curvature during bending must not become too small, and since the optical fiber core wire cannot be cut or connected freely, it can be used as an extra length for maintenance or when changing connections. These points include the need for extra length, and connection using an optical connector increases loss, so it should be kept to a minimum. Therefore, this type of conventional optical fiber cable distribution rack has a structure in which the excess length of the optical fiber bar cord is wound and held in a ring shape, and then guided to the optical connector.

FIG. 1 is a perspective view showing the main parts of a conventional optical MDF. In FIG. 1, reference numeral 1 denotes left and right frames, panels 3 and 4 are fixed to supports 2 of the frame 1, and optical adapters 6 are installed near the lower sides of the panels 3 and 4.
is attached, and above it, several posts 7 are arranged in a circular shape as a group. on the other hand,
After the optical fiber cable 8 on the subscriber line side and the optical fiber cable 9 on the end station side are bundled to the support 10 on the upper part of the frame 1, the cable sheathing is removed to expose the optical fiber cord 11, and the optical fiber cable 9 is attached to the frame. After the extra length is wrapped around the group of posts 7 and held, the optical plug 12 attached to the tip of each optical fiber bar cord 11 is inserted into the optical adapter 6. Ru. With such a structure, the packaging density of the optical connectors is extremely low, and the operability during quick connection change operations, which is the basic function of the distribution rack, is not good. Particularly when the number of subscriber lines increases, an increase in the extra length of the optical fiber barcode 11 significantly increases the extra length accommodation area, resulting in a reduction in packaging density. Furthermore, since the paths of the optical fiber barcodes 11 are concentrated on one side of the distribution rack, confusion occurs, causing problems such as time-consuming connection changes and unnecessary stress on the optical fiber barcodes 11. Furthermore, if the width of the distribution rack is increased or the number of distribution racks is increased to two or more in order to increase the number of subscriber lines, problems such as difficulty in holding the optical fiber barcode 11 arise.

(Object of the Invention) In view of the above-mentioned problems, the present invention aims at high-density packaging of distribution racks for optical fiber cables, makes it possible to increase the number of accommodated subscriber lines, and makes connection change operations quick and easy. Another object of the present invention is to provide an optical fiber cable distribution rack that can maintain an appropriate bending curvature of the optical fiber core.

(Structure of the Invention) The first invention provides left and right side frames that face each other in parallel at a predetermined interval and each has a support near the center in the front-rear direction, and a space between the supports of each side frame. an optical adapter board which is installed and has an optical adapter mounted thereon and an optical fiber bar code receiving shelf at least with a predetermined space left and right on the front side thereof; and an optical fiber board which is installed in a vertically intermediate portion between the side frame bodies. a cord crossing path, a wire straightening tool or an optical fiber barcode direction changing tool is attached to the side frame body, and an optical fiber barcode fixing tool is provided on the optical fiber barcode receiving shelf, The left and right side frames face each other in parallel with a predetermined interval and each has a support near the center in the front-rear direction, and is installed between the supports of each side frame, and has an optical adapter mounted thereon. At least on the front surface thereof, an optical adapter plate is provided with an optical fiber barcode receiving shelf leaving a predetermined space left and right on the left and right, and an optical fiber barcode crossing passage provided in the vertically intermediate portion between the side frame bodies, A pair of distribution rack units are provided with a wire straightening tool and an optical fiber bar code direction changing tool attached to the frame body, and an optical fiber code fixing tool is provided on the optical fiber code receiving shelf, and the optical fiber cable is placed between the opposing side frames. are arranged in parallel so as to form a space for branch processing, and are connected to each other by a connecting bone, and an optical fiber barcode wrapping device is attached to the connecting bone.

(Example) Next, an example of the present invention will be described with reference to FIG. Note that the same components as those in the conventional example are represented by the same reference numerals. FIG. 2 is a perspective view of the main parts of the optical fiber cable distribution rack according to the present invention, viewed from the terminal equipment connection side in the central office building. That is, in this embodiment, the side in front of the post described later is the terminal equipment connection side in the central office building, and the side to the rear is the subscriber side. One unit of the distribution rack according to the present invention includes left and right side frames 20 that face each other in parallel at a predetermined interval and each has a support 21 near the center in the front-rear direction, A plurality of optical adapter plates 30 are installed between the pillars 21, each of which has a predetermined number of optical adapters 31 mounted thereon, and has optical fiber code (hereinafter simply referred to as optical code) receiving shelves 32 on its front and back surfaces, and the side frame. body 2
An optical code crossing path 40 is provided in the vertically intermediate part between A space is left for several optical cords to pass through, and an optical cord fixture 70 is further provided on the optical cord receiving shelf 32.

Each of the side frame bodies 20 has a frame structure in which a plurality of horizontal aggregates 20b are installed at equal intervals in the vertical direction between a pair of vertical aggregates 20a that are spaced at a predetermined interval in the front-rear direction. In addition, in the side frame body 20, several horizontal aggregates 20b are removed from the optical fiber cable (hereinafter referred to as optical cable) branch processing section side of the optical cord crossing path 40, and vertical aggregates 20a in the front are also removed. A part of the optical code is removed to simplify the work of inserting the optical code. In addition, 22 is an upper frame body that connects the upper ends of the front left and right vertical beams 20a and the left and right columns 21, and 23 is a bottom plate that fixes the lower ends of the front and left vertical beams 20a and the left and right columns 21. It is.

The wire straightening tool 50 is, for example, a vertical plate 50 attached to the horizontal aggregate 20b of the side frame 20 as shown in FIG.
a, a horizontal plate 50b provided at the upper and lower ends thereof, and a through hole 50c provided in the center of the horizontal plate 50b through which a plurality of optical cords can be inserted.
c opens toward the optical adapter plate 30, and the lower through hole 50c opens toward the side of the optical adapter plate 30, and the size of this opening is 1.
The setting is such that the optical code of the book can pass through. As the optical code direction converter 60, for example, as shown in FIG.
It consists of a vertical plate 60a attached to a vertical plate 60a and a horizontal plate 60b provided at its upper end, and the horizontal plate 60b is provided with an optical cord insertion hole 60c that opens toward the optical adapter plate 30 side. Alternatively, as shown in FIG. 2, a vertical plate 60a having an upper end curved inward may be used. The optical cord fixing plate 7
0 is an optical cord receiving shelf 30 as shown in FIG. 5, for example.
The fixed plate main body 70a is made of an elastic material such as rubber and is elongated in the front-rear direction, and a plurality of optical code fitting grooves 70b are provided at appropriate intervals in the longitudinal direction and perpendicular to the fixed plate main body 70a.

In the pair of distribution rack units configured as described above, the side frames 20 from which parts of the vertical aggregates 20a and horizontal aggregates 20b have been removed face each other, and a space 80 for branching optical cables is formed between them. They are arranged in parallel and connected to each other by connecting bones 90. 10
0 is an optical cord binding device attached to the connecting bone 90,
As shown in FIG. 6, the connecting bones 90 are opened at the front.
Consisting of a U-shaped frame 100a attached to the opening and a closing plate 100b that closes the opening, the closing plate 100b
is adapted to be detachably attached to the open end of the frame 100a.

Next, the effect will be explained. The optical cable 9 that has been guided from the terminal equipment inside the station building along the ceiling structure of the station building hangs down from the top of the optical cable branching processing space 80, is tied to the upper connecting bone 90 with a cable tie, and then hangs down further. The covering is removed from the upper part of the upper optical cord wrapping device 100 to expose the plurality of optical cords 11, and after being wrapped with the optical cord wrapping device 100, it is further hung down, and then folded back to the lower part. Optical cord binding device 100
be confined at. The optical cord 11 included between the upper and lower optical cord wrappers 100 has an extra length necessary for maintenance. The upper optical cord wrapping device 100 functions as a fixing point when one optical cord 11 is pulled out of the optical fiber cable distribution rack during maintenance, and the lower optical cord wrapping device 100 is used for normal operation. Acts as a fixed point when changing connections.

Optical cord 1 passing through the lower optical cord binding device 100
1 reaches the optical adapter 31 through eight routes, and the optical plug attached to the tip of the optical cord 11 is inserted into the optical adapter 31 and connected to the subscriber line optical cord.

The above eight routes are created by dividing the optical adapter plates 30 mounted on a pair of distribution rack units into four groups each (two groups above and below the optical code crossing path 40 and two groups above and below below). It becomes a route leading to each group. The optical cords 9 that have reached the vicinity of each group are transferred from the left and right spaces of the optical code receiving shelf 32 of each optical adapter plate 30 to an optical code fixing device provided near the optical code introduction side end of the optical code receiving shelf 32. After being locked with the tool 70, it is inserted into the optical adapter 31. At this time, the remaining length of the optical cord 11 is processed in two ways: a method in which it hangs down along the inner surface of the side frame 20, and a method in which it is processed on the optical cord receiving shelf 32.

By the way, the optical cord 11 that has passed through such a route
When changing connections, for example, when changing the optical cord 11 connected to the optical adapter 31 at the bottom right end of the distribution rack unit on the right to the optical adapter 31 at the top right end of the distribution rack unit on the left, the current The procedure is to remove a predetermined optical cord 11 from the route it is taking, open it to the lower part near the optical cord wrapping device 100, and then apply it to the route leading to the top. At this time, since the side frame body 20 has a frame structure, it is possible to separate and take out one optical cord 11 to be reconnected from among the intersecting optical cords 11 from both sides of the side frame body 20. Good sex.

The wire straightening tool 50 is appropriately attached to the side frame body 20 having a frame structure for the above-mentioned distribution work, and is used to straighten the optical cord 1.
It is used to eliminate the intersection of 1. However, if the amount is too large, the workability will decrease. Similarly, the optical cord direction converting tool 60 is configured such that when the optical cord 11 is changed from an upwardly facing state to a downwardly facing state during distribution work, the curvature of the bending is reduced by the weight of the optical cord 11. It is used as appropriate to prevent bending and to allow proper bending. For example, when the optical cord 11 passes through the lower optical cord wrapping device 100, it heads upward, passes through the optical cord direction converter 60, and heads downward to reach the group of 30 optical adapter plates at the bottom, or when the optical cord 11 passes through the optical cord wrapping device 100 at the top, As with the optical cord 11 that reaches the lowest optical adapter plate 30 in the 30 groups, it is necessary to process the extra length by drooping. This is effective when reaching the optical adapter plate 30 after hanging down. The optical cord receiving shelf 32 also separates the optical cord 11 into individual optical adapter plates 30 units for distribution work.
By supporting the weight of the optical cord 11 and preventing excessive load from being applied to the connection part, keeping the bending curvature appropriate, and running it along the top, the excess in the width direction of the optical adapter plate 30 in the optical cord is reduced. Can handle long lengths. The optical cord fixture 70 prevents the optical cord 11 from slipping off the optical cord receiving shelf 32, and significantly improves the workability when changing connections.

On the other hand, on the subscriber line side, the optical cord 11 hangs down along the inside of the side frame body 20 having a frame structure, and the remaining length is processed by a hanging process to reach the optical adapter plate 30. In the route along the way, the functions of the wire straightening tool 50, the optical cord fixing tool 70, and the optical cord receiving shelf 32 are used, but these functions are similar to those on the terminal station equipment side in the station building.

By simplifying the handling of the excess length of the optical cord 11 and increasing the packaging density through the functions of each component explained above, it is possible to accommodate a large capacity subscriber line, and at the same time, it satisfies all the handling conditions for the optical cord 11. A distribution rack for optical fiber cables can be obtained.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it is clear that the same effect can be obtained even when there is only one distribution rack unit, and the above-mentioned effect can also be obtained with other constituent parts. It is sufficient if the quantity is appropriate for the position.

(Effects of the Invention) As explained above, according to the first invention, the left and right side frames face each other in parallel at a predetermined interval and are each provided with a support near the center in the front and back direction; An optical adapter plate is installed between the supports of the side frame body, has an optical adapter mounted thereon, and has an optical fiber bar code receiving shelf at least on the front side with a predetermined space left and right. an optical fiber barcode crossing path provided in the intermediate portion, a wire straightening tool and an optical fiber barcode direction changing tool are attached to the side frame body, and an optical fiber barcode fixing tool is provided on the optical fiber barcode receiving shelf. It is possible to provide a distribution rack for optical fiber cables that fully satisfies the handling conditions for optical fiber barcodes, and according to the second invention, the racks are arranged parallel to each other at a predetermined interval, and each support is provided near the center in the front and back direction. an optical adapter board installed between the provided left and right side frames and the supports of each side frame body, on which an optical adapter is mounted, and at least in front thereof, an optical fiber barcode receiving shelf is provided with a predetermined space left on the left and right sides; and an optical fiber barcode crossing passage provided in the vertically intermediate portion between the side frames, and a wire straightening tool and an optical fiber barcode direction converting tool are attached to the side frames, and the optical fiber barcode crossing path is provided on the optical fiber barcode receiving shelf. A pair of distribution rack units each having an optical fiber barcode fixing device are arranged in parallel so that a space for branching the optical fiber cable is formed between the opposing side frames, and are connected to each other by a connecting bone. Since the optical fiber bar code wrapping device is attached to the bone, it is possible to provide an optical fiber cable distribution rack that fully satisfies the handling conditions for the optical fiber bar code and further improves the packaging density.

[Brief explanation of drawings]

Fig. 1 is a partial perspective view showing a conventional distribution rack for optical fiber cables, Fig. 2 is a perspective view showing the main parts of an embodiment of the distribution rack for optical fiber cables according to the present invention, and Fig. 3 is a perspective view of a wire straightening tool. A perspective view showing an example; FIG. 4 is a perspective view showing an example of an optical code direction converter;
FIG. 5 is a perspective view showing an example of an optical cord fixing plate, and FIG. 6 is a perspective view showing an example of an optical cord binding device. 9... Optical fiber cable, 11... Optical fiber bar code, 20... Side frame body, 21... Support column, 30... Optical adapter plate, 31... Optical adapter, 32... Optical fiber bar code receiving shelf, 40... Optical fiber bar code crossing path, 50 ... Wire arrangement tool, 60 ... Optical fiber barcode direction conversion tool, 70 ... Optical fiber barcode fixing plate, 8
0...Optical fiber cable distribution processing space,
90... Connecting bone, 100... Optical fiber barcode restraint device.

Claims (1)

[Scope of Claims] 1. Left and right side frames facing in parallel at a predetermined interval and each having a support near the center in the front-rear direction, and constructed between the supports of each side frame,
an optical adapter board on which an optical adapter is mounted and an optical fiber barcode receiving shelf provided at least on the front surface thereof with a predetermined space left and right, and an optical fiber barcode crossing path provided in a vertically intermediate portion between the side frames; An optical fiber cable distribution rack comprising: a wire straightening tool and an optical fiber bar code direction changing tool attached to the side frame body; and an optical fiber bar code fixing tool provided on the optical fiber code receiving shelf. 2. Left and right side frames facing parallel at a predetermined interval and each having a support near the center in the front-rear direction, and constructed between the supports of each side frame,
an optical adapter board on which an optical adapter is mounted and an optical fiber barcode receiving shelf provided at least on the front surface thereof with a predetermined space left and right, and an optical fiber barcode crossing path provided in a vertically intermediate portion between the side frames; A pair of distribution rack units comprising a wire straightening tool and an optical fiber barcode direction changing tool attached to the side frame body, and an optical fiber barcode fixing tool provided on the optical fiber barcode receiving shelf,
The optical fiber cable is arranged in parallel so that a space for branching the optical fiber cable is formed between the opposing side frames, and is connected to each other by a connecting bone, and an optical fiber bar code wrapping device is attached to the connecting bone. Distribution rack for fiber cables.