JP3910556B2 - Optical wiring rack - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical wiring rack that branches and connects an optical fiber cable to an optical fiber core wire through a connector connection.
[0002]
[Prior art]
Conventionally, a plurality of optical fibers are individually accommodated and an optical coupler is provided therein, and the optical branching modules that are arranged in parallel and accommodated in each stage and branched from the optical couplers in each optical branching module. In addition, there is known an optical branch module housing rack including an optical switch for selectively optically coupling the test branch core wire to the master side optical fiber (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-9-33733 [0004]
Also, in an optical fiber network, for example, in order to branch and connect an optical fiber cable to an optical fiber core via an optical connector connection, an optical wiring rack having a large group configuration is formed by terminating a large number of local and external optical fibers. Is done. In particular, an FTM (Fiber Termination Module) is used as an optical wiring rack used for a subscriber transmission line.
FIGS. 10 and 11 are diagrams showing a conventional optical wiring rack applied to FTM, in which reference numeral 1 denotes a frame, 2 denotes a terminal board, 3 denotes an optical connector, and 4 denotes an optical branching module.
[0005]
The frame 1 is formed in a shelf shape that is partitioned into a plurality of steps at equal intervals by a horizontally arranged partition plate 5, and a plurality of steps for storing the optical branching module 4 are formed. A terminal plate 2 that substantially covers the opening is fixed to the opening on the same side of each step of the frame 1. A plurality of holes 6 for mounting the optical adapters 3 are arranged side by side on the terminal board 2, and two well-known SC-type optical adapters 3 are arranged and fixed in the holes 6. The optical adapter 3 includes a plurality of SC-type terminal optical connector plugs (not shown) to which the intra-office optical fibers 7 are connected on the outside, and a plurality of SC-type terminals (not shown) to which the outside optical fibers are connected to the inside. It is arranged at a position corresponding to the terminal for the fiber 7.
[0006]
The basic configuration of the optical branching module 4 is shown in FIG.
As shown in FIG. 14, the optical branching module 4 houses optical components such as an optical connector 10 for switching and connecting the optical coupler 9, the optical filter 4d, and the optical fiber 4c.
To test and manage an optical line, first, an optical branch module that stores a test core is selected by an optical switch 4a, and is transmitted from an optical pulse test device 4b (optical pulse core selection device). The test light is transmitted to the optical fiber 4c outside the station to be measured via the optical coupler 9, and the backscattered light generated in the optical fiber 4c is transmitted to the optical pulse test device via the optical coupler 9. The light receiving unit 4b receives light, and then the loss abnormality of the subscriber optical line is monitored by analyzing the waveform of the received backscattered light.
[0007]
A conventional four-core branch module will be described with reference to FIGS. 12 and 13. This optical branch module is a thin plate-like body as a whole and can be opened and closed by an open / close lid (not shown).
On the back side of the optical branching module 4 (left side in FIGS. 12 and 13), a 4-core optical fiber tape 8a derived from the external optical fiber cable (terminated cable) K and 1 derived from the core selection device. An 8-fiber optical fiber tape 8b is introduced.
A fiber-type optical coupler 9 is accommodated in the optical branching module 4, and an optical fiber tape 8b on the side of the optical fiber selector is connected to an optical fiber tape on the optical coupler 9 side by an optical connector 10 for 8 cores. Connected to. As the optical connector 10, a multi-fiber plastic optical connector such as a so-called MT connector (Mechanically Transferable) established in JIS C 5981 or the like is employed.
[0008]
Next, the optical fiber tape 8a on the outside optical fiber cable (terminated cable) side is connected to an optical fiber tape (not shown) on the optical coupler 9 side by an optical connector 10 for four cores.
On the other hand, one four-core optical fiber tape led out from the station inner port of the optical coupler 9 is led out of the main body as an optical cord 8w, and is further fixed by a multi-core single-core branching device F fixed to the side plate. The light is branched into four single-core optical fibers 8y.
The tip of each branched single optical fiber 8y is terminated to an SC type optical plug and connected to an SC type optical adapter 3 fixed to the terminal plate 2 of the frame 1.
[0009]
About 50 optical branching modules 4 are provided in each stage of the frame 1 with a width of, for example, 13.5 mm. The optical branch module 4 includes an optical cord 8w, an optical coupler 9 connected to the optical cord 8w, and an optical connector 10 for optically connecting the optical fiber tapes 8a and 8b and the optical cord 8w so that the connection can be switched. Is stored.
A suspension member 12 for hanging from a suspension rail 11 installed on the upper part of each stage of the frame 1 is attached to the upper side portion when the optical branching module 4 is stored.
[0010]
[Problems to be solved by the invention]
By the way, in the case of the FTM as described above, since there are a large number of parts and a sufficient space is not secured in each stage in view of the demand for an increase in the number of housing cores and an increase in mounting density, a narrow space is required. In this case, it is necessary to carry out the mounting work of the optical parts such as the optical adapter 3, and the mounting workability is not satisfactory. In addition, when replacing one specific optical branching module 4, it is necessary to remove the optical branching module 4 in the vicinity of the optical branching module 4 so as to secure a space that allows an operator's hand to enter. Work has become difficult as the number increases and the packaging density increases. Therefore, in the FTM as described above, it is difficult to increase the number of corresponding cores more greatly (for example, twice or more), and development of a new type of FTM has been demanded.
[0011]
Further, in the optical branching module 4 as described above, when the optical fiber switching connection system is used to switch the optical connector 10 housed in the optical branching module 4 at the time of switching the core wire, as shown in FIG. Further, the corresponding optical branch module 4 is pulled out from the frame 1 and placed on a shelf, the inside of the pulled optical branch module 4 is opened, and the optical connector 10 is pulled out from the inside. When pulling out, the optical components such as the optical coupler 9 and the filter (not shown) connected to the optical cord 8w are pulled out together, and work can be performed without affecting the optical communication in the live line state. It was difficult. In addition, it is necessary to secure a working space in the FTM 1, which makes it difficult to increase the mounting density of the optical branching module 4.
Incidentally, the optical connector is a multi-fiber optical connector as defined in JIS C 5981.
[0012]
The present invention has been made in view of the above-corresponding with number of cores can be increased, optical wiring rack capable of reducing as much as possible the influence of the optical communication when working, such as connection switching Is intended to provide.
[0013]
[Means for Solving the Problems]
The optical wiring rack according to claim 1, wherein the optical fiber cable is branched and connected to the optical fiber core wire through the connector connection, and the optical fiber led out from the optical fiber cable has a bending radius larger than a specified value. An optical fiber storage unit for storing and storing, and an optical branch for storing an optical coupler interposed in the middle of the optical fiber having one end connected to the optical fiber on the optical fiber cable side and the other end connected to the optical fiber core wire A module storage unit that stores modules arranged side by side in multiple stages separated by multiple partitions by horizontally arranged partition plates, and the module storage unit are spaced apart from each other and can switch between optical fibers Connector holding means for holding a plurality of switching optical connectors to be connected to each other so that they can be taken out, and each stage of the module housing portion includes a partition plate The optical branching module is housed between the inner partition plate horizontally disposed on the upper side thereof, and has an optical switch placed on the inner partition plate, and each of the stored light branching units A connector holder that detachably clamps and holds a switching optical connector that is connected to the lead cord so that the optical fiber drawn from the module can be connected to the lead cord drawn from the optical switch. The solution of the above-mentioned problem is that the inner partition plate is attached to an end portion on the front side which is the side from which the optical branching module housed so as to be drawable between the inner partition plate and the partition plate is pulled out. As a means.
Further, in the invention according to claim 2, the switching optical connector for terminating the optical fiber drawn from the optical branching module so as to be connectable to the lead cord drawn from the optical switch is an MT type optical connector. It is characterized by.
According to a third aspect of the present invention, there is provided a surplus length storage means for storing a surplus length of the optical fiber in the vicinity of the connector holding means.
[0015]
According to the optical wiring rack of the present invention, in each stage of the module storage unit, the optical fiber drawn from the plurality of optical branching modules stored between the partition plate and the internal partition plate, and the optical switch side Since the connection part (part connected by the switching optical connector) of the lead cord can be centrally held in the connector holder, when performing work involving removal of the switching optical connector from the connector holder, such as connection switching, It is easy to find the optical fiber to be worked on, and even if there are many optical fibers to be connected to the optical switch side lead cord, the optical fiber or optical coupler in the optical branch module Connection switching can be performed while avoiding adverse effects on optical components.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, an embodiment of an optical wiring rack (hereinafter referred to as “FTM”) according to the present invention will be described.
1 to 3 show the basic configuration of the FTM 51 of this embodiment. The FTM 51 has a box-shaped frame 52, FIG. 2 shows the front side, and FIG. 3 shows the back side. The end of the optical fiber cable 53 and the optical fiber led out from the optical fiber cable 53 are wired on the front side, and a single core wire for transmitting an optical signal output from a transmission device (not shown) is coded on the back side. A single-core optical cord 67 is accommodated. The single-core optical cord 67 is cabled or guided to the FTM 51 by a single-core optical cord converging body, and distributed to the wiring trays 99 on the back side of the frame 52.
The optical fiber 54 corresponds to a subscriber-side multi-core optical fiber. The single-core optical cord 67 corresponds to an optical fiber core wire.
[0018]
The FTM 51 is divided into left and right parts, one side being a module storage part 56 and the other side being a lead-out optical fiber storage part 57 for storing an optical fiber derived from an optical cable. The lead-out optical fiber storage portion 57 is partitioned by a vertical partition wall 58 on the front side and the back side, and the optical fiber cable 53 and the optical fiber tape core of the optical fiber cable 53 are mainly coded on the front side. The formed optical fiber cord 54 is routed, and the single-core optical cord 67 is introduced on the back side.
[0019]
The module storage portion 56 is partitioned into a plurality of steps of equally spaced shelves by a partition plate 59 disposed horizontally in the frame 1, and as shown in FIG. A large number of optical branching modules 60 are housed side by side. Further, as shown in FIG. 4, the partition plate 59 is partitioned up and down by an internal partition plate 61 arranged horizontally, and an optical switch 62 is placed on the internal partition plate 61. Yes.
[0020]
As shown in FIG. 5, the light branching module 60 is inserted in a standing posture between the lower partition plate 59 and the internal partition plate 61, and can be pulled out to the front side of the sheet. On the upper surface of the partition plate 59, a guide flange 63 for guiding the drawing operation and positioning in the alignment direction is provided upright. Further, as shown in FIG. 6, a vertical terminal plate 64 is fixed to the back side of each stage. As shown in FIGS. 4 and 6, the terminal board 64 has an optical adapter insertion hole into which an 8-unit MU adapter 65 (multi-unit adapter) protruding from one side of the optical branching module 60 is inserted from the front side. 66 is opened. An SC-type optical plug 68 that terminates the single-core optical cord 67 is inserted into the MU adapter 65 inserted into the optical adapter insertion hole 66 so that it can be inserted and removed. The single-core optical cord 67 connected to the MU adapter 65 is clamped and aligned by a rod-shaped fiber clamp 69 projecting from the terminal plate 64 below the optical adapter insertion hole 66, and further below the fiber clamp 69. The curved plate 70 attached to the side is curved while maintaining a curved radius that is not less than a specified value, and is accommodated in a receiving rod 71 installed in the vicinity of the lower partition plate 59.
[0021]
Next, an embodiment of the optical branching module 60 according to the present invention will be described with reference to FIG.
As shown in FIG. 7, the optical branching module 60 is made of a light material such as plastic and has a thin plate-like main body 72 as a whole, and can be opened and closed by an opening / closing lid (not shown). On the rear end surface of the optical branching module 60 (the right end in FIG. 7), two MU adapters 65 in series are attached in series (a total of 16 adapter holes are formed). Is provided with an engaging hook 73 that engages with the opening edge of the optical adapter insertion hole 66 of the terminal plate 64.
The 8-unit MU adapter 65 is a unit formed by serially connecting eight SC-type optical adapters for single-core optical fibers having a built-in positioning ring sleeve, and is connected to the optical connector for connection according to the present invention. Equivalent to. 16 single-core wires 74 accommodated in the main body 72 are inserted into the main body 72 of the 8-series MU adapter 65 so as to be insertable / removable by the SC plug 75. These single-core wires 74 are branched from the end of an optical fiber 76 (eight-fiber optical fiber ribbon) housed in the main body 72 via an optical coupler 77 interposed in the middle of the optical fiber 76. Part.
[0022]
The optical coupler 77 is a wavelength-independent quartz substrate waveguide type optical coupler having 16 channels, and is stably held by a holding piece (not shown) protruding inside the main body 72. Further, a total of four optical lines 78 made of an 8-fiber optical fiber ribbon are connected between the optical coupler 77 and the optical switch 62 installed outside the optical branching module 60. Therefore, the test light transmitted from the optical switch 62 to the optical line 78 is sent to the optical line 76 on the subscriber side via the optical coupler 77, and the reflected wave of the subscriber line outside the station is reflected by the optical coupler 77 and the light beam. Returning to the optical switch 62 via the path 78, the loss is monitored by the optical line monitoring device. The other end of the optical line 78 connected to the optical coupler 77 is guided to the optical switch 62 side and subjected to non-reflection processing.
[0023]
The optical lines 74, 76, and 78 accommodated in the main body 72 are all stably stored with a radius of curvature exceeding a specified value by a radius maintaining plate 79 and a pressing plate 80 projecting from the inner surface of the main body 72. The The optical lines 76 and 78 are both drawn out from the cord outlets 81 and 82 that are opened at positions spaced apart from each other on the front end face of the optical branching module 60, and are disposed in the cord outlets 81 and 82. It is retained by the tools 83 and 84.
[0024]
Ends of the optical lines 76 and 78 are terminated by switching optical connectors 85 and 86 for eight fibers, respectively, and are drawn out from the lower cord outlet 81 as shown in FIGS. The switching optical connector 85 which is coded and terminates the optical line 76 is held by a connector storage unit (connector holding means) 87 installed in the lead-out optical fiber storage portion 57, and as shown in FIG. The switching optical connector 86 that terminates the optical line 78 drawn out from the outlet 82 is detachably clamped and held by a connector holder 89 attached to the front end portion (left side in FIG. 4) of the internal partition plate 61, and the optical branching module. It is connected to a lead cord 88 drawn from the optical switch 62 immediately above 60.
As the switching optical connectors 85 and 86, multi-fiber plastic optical connectors such as a so-called MT connector (Mechanically Transferable) established in JIS C 5981 and the like are employed.
[0025]
Note that both ends of the optical fiber cords 54 and 88 are terminated by switching optical connectors 85 and 86 that are compatible with the switching optical connectors 85 and 86 so that the connection can be switched easily.
The optical line 76 led out from the lower cord outlet 81 is stored in a receiving rod 59a provided on the front side of the lower partition plate 59 in which the optical branching module 60 is stored, and is guided light. It is drawn out to the fiber storage portion 57.
[0026]
As shown in FIG. 1 and FIG. 2, a plurality of connector storage units 87 are installed in multiple stages in the vertical direction near the module storage section 56 on the front side (paper surface side) of the derived optical fiber storage section 57. Further, as shown in FIG. 8, on both sides of each connector storage unit 87, extra length storage cases 90 for storing connection extra lengths 54a and 76a made of optical fiber cords on both sides connected in the connector storage unit 87 are provided. (Extra length storage means) is installed in multiple rows. The connector storage unit 87 has a structure in which a drawer-type tray 92 is stored in a box-shaped casing 91 that is open on both sides, and a plurality of switching optical connectors 85 are arranged in the tray 92 as shown in FIG. A large number of thin plate-like connector cases 93 are arranged and accommodated, and a large number of switching optical connectors 85 are arranged and accommodated by these connector cases 93. The connector case 93 can be freely inserted into and removed from the tray 92 and can be opened and closed, so that the switching optical connector 85 housed therein can be easily removed.
[0027]
As shown in FIG. 8, the extra-length storage case 90 is an empty case having an opening 94 at one end in the longitudinal direction and having a thin and long sheath shape, and is inclined obliquely forward with the opening 94 facing upward. Thus, the FTM 51 is multi-connected toward the back. In this extra length storage case 90, the inner space is an extra length storage space for the optical fiber, the lateral width H of the inner space is set slightly larger than the minimum curved diameter of the optical fiber core wire, and the length L is necessary for connection. The extra lengths 54a and 76a are set to dimensions that can be stored in a suspended state.
[0028]
Further, on the front side of the derived optical fiber storage portion 57 of the FTM 51, a cable gripping component 95 for holding the optical fiber cable 53 and an optical fiber cord 54 led out from the optical fiber cable 53 are connected to the connector storage unit 87 at each stage. A mandrel type code distributing member 96 and a duct 98 for distributing and wiring are provided.
As shown in FIG. 3, a cord sorting member 96 and a cord support 97 are provided on the back side of the lead-out optical fiber storage portion 57 of the FTM 51, and the single-core optical cord 67 sorted by the cord sorting member 96 is further provided. A wiring tray 99 that leads to a receiving bar 71 provided on the end plate 64 of each stage of the module storage unit 56 is installed. The single-core optical cord 67 is introduced into the FTM 51 from the introduction unit 100 installed on the back side of the lead-out optical fiber storage portion 57, and most of the single-core optical cord 67 is supported by the cord support 97 and the like. The wires are routed so as to be distributed by the code distributing member 96 after passing through the lower part. A part of the single-core optical cord 67 is directly introduced into an appropriate wiring tray 99 via a branch rod 101 protruding from the introduction unit 100.
[0029]
Hereinafter, functions and effects of the FTM 51 and the optical branching module 60 of the present embodiment will be described.
In this embodiment, since the switching optical connector 85 is gathered, organized and stored in the connector storage unit 87, it is easy to take out the switching optical connector 85 of the target optical fiber cord 54 and optical line 76. Work efficiency such as connection switching is improved. In addition, since a plurality of target switching optical connectors 85 can be pulled out to positions close to each other, it is easy to apply the optical fiber switching connection system when switching the connection between these switching optical connectors 85. It is possible to further improve the work efficiency of connection switching. Further, since the surplus lengths 54a and 76a used for the operation of switching the connection in the connector housing unit 87 may be pulled out from the surplus length housing case 90, it is not necessary to pull out the surplus length 76a from the optical branching module 60 and the workability is improved. To do.
[0030]
Therefore, in the present embodiment, the optical fiber cord 54 and the optical line 76 can be connected and switched without touching the optical branching module 60, and the storage state of the optical components such as the optical coupler 77 stored in the optical branching module 60 is changed. Since it is stably maintained, the work can be performed without affecting optical communication even in a live line state. In the present embodiment, the connection switching between the lead cord 88 of the optical switch 62 and the optical line 78 can be similarly performed without touching the optical branching module 60, so that there is no fear of affecting optical communication. .
[0031]
Further, it is not necessary to secure the storage space for the switching optical connectors 85 and 86 in the optical branch module 60, and most of the extra length 76a of the optical line 76 is stored in the extra length storage case 90 to the optical branch module 60. Therefore, the optical branching module 60 can be miniaturized and the mounting density in the module housing portion 56 can be improved. Further, since the surplus lengths 54a and 76a are hung near the both sides of the connector housing unit 87 and stored in the surplus length storage case 90, a sufficient length of surplus length can be stored and the switching optical connector is used. It is possible to efficiently perform operations such as storing and pulling out the extra lengths 54a and 76a necessary for connecting 85 and 86 and switching the connection. Further, in the FTM 51, it is not necessary to secure a work space for connection switching or the like in the module storage unit 56, which contributes to an improvement in the mounting density of the optical branching module 60. As a result, the FTM 51 can increase the number of corresponding cores with almost no increase in size. Specifically, the conventional FTM corresponds to 1000 optical fibers, whereas the FTM 51 of this embodiment can correspond to 4000 optical fibers, and improves workability such as connection switching. be able to.
[0032]
Further, since the connector housing unit 87 and the optical branch module 60 are separated from each other, vibrations caused by the pull-out operation of the switching optical connector 85, the pull-out operation of the extra length 76a, and the like accompanying the connection switching work are caused. Since the optical components such as the optical lines 76 and 78 and the optical coupler 77 are not affected, the optical components can be accommodated extremely stably. As a result, the work can be performed efficiently and the connection switching operation is in progress. The reliability of optical communication can be improved to a very high level.
[0033]
In addition, the content of the optical component accommodated in the optical branching module 60 is not limited to the said embodiment.
The configuration of the connector holding means is not limited to the connector storage unit 87. Further, the configuration of the surplus length storage means is not limited to the surplus length storage case 90, and includes one integrated with the connector holding means.
[0034]
【The invention's effect】
As described above, according to the optical wiring rack according to the present invention, the optical fiber led out from the plurality of optical branching modules stored between the partition plate and the internal partition plate in each stage of the module storage unit. And the connection part (part connected by the optical connector for switching) of the lead cord on the optical switch side can be centrally held in the connector holder, so that the operation involving taking out the optical connector for switching from the connector holder such as connection switching When doing this, it is easy to find the optical fiber to be worked on, and even if there are a large number of optical fibers to be connected to the optical switch-side lead cord, The effects of contact, vibration, etc. that occur during such connection switching operations are absorbed by the extra length outside the branch module and transmitted to optical components such as optical fibers and optical couplers stored in the main unit. There. Therefore, operations such as connection switching related to the optical connector for switching can be efficiently performed without affecting optical communication even in a live line state.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an FTM according to an embodiment of the present invention.
FIG. 2 is a front view showing a front side of the FTM of FIG.
FIG. 3 is a rear view of the FTM in FIG. 1;
4 is an enlarged side view showing a storage state of the optical branching module in the FTM of FIG. 1. FIG.
FIG. 5 is an enlarged perspective view of a main part showing a storage state of the optical branching module in the FTM of FIG. 1;
6 is an enlarged rear view of the main part of FIG. 3;
FIG. 7 is a front sectional view showing an optical branching module according to an embodiment of the present invention.
FIG. 8 is a perspective view showing a connector storage unit and an extra length storage case, showing an embodiment of the present invention.
9 is a perspective view showing a tray and a connector case of the connector storage unit in FIG. 8. FIG.
FIG. 10 is a side view showing an optical wiring rack.
FIG. 11 is a front view showing an optical wiring rack.
FIG. 12 is a side view showing a conventional optical branching module.
FIG. 13 is a diagram showing a conventional optical branching module, and is a side view showing connection switching by an optical connector.
FIG. 14 is a schematic diagram showing a basic configuration of an optical branching module.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 51 ... Optical wiring rack (FTM), 53 ... Optical fiber cable, 54 ... Optical fiber (optical fiber cord), 54a ... Extra length, 55 ... Optical fiber core wire (single-core optical cord), 56 ... Module storage part, 57 DESCRIPTION OF SYMBOLS ... Derived optical fiber storage part, 59 ... Partition plate, 60 ... Optical branching module, 62 ... Optical switch, 65 ... Optical connector for connection (SC type optical adapter, MU adapter), 72 ... Main body, 76 ... Optical fiber (optical fiber) Tape core), 76a ... extra length, 77 ... optical coupler, 78 ... optical fiber (optical fiber tape core wire), 85 ... optical connector for switching, 87 ... connector holding means (connector storage unit), 90 ... extra length storage Means (extra length storage case).

Claims (3)

An optical wiring rack (51) for branching and connecting an optical fiber cable (53) to an optical fiber core wire (55) via a connector connection,
A lead-out optical fiber storage section (57) for storing the optical fiber (54) led out from the optical fiber cable (53) while maintaining a curvature radius greater than a specified value;
An optical branching module (60) containing an optical coupler (77) interposed in the middle of an optical fiber (76) having one end connected to the optical fiber on the optical fiber cable side and the other end connected to the optical fiber core, A module storage section (56) for storing a plurality of horizontal and side-by-side arrays in each of the stages partitioned by a horizontally-divided partition plate (59);
And a connector holding means (87) that is provided at a position separated from the module housing section and holds a plurality of switching optical connectors (85) that connect the optical fibers in a switchable manner. ,
Each stage of the module storage unit stores the optical branching module between the partition plate and the internal partition plate (61) horizontally disposed above the partition plate, and the optical switch placed on the internal partition plate (62)
Further, the switching optical connector (86) for terminating the optical fiber (78) drawn from each optical branching module accommodated to the drawing cord (88) drawn from the optical switch is provided. The optical branching module in which a connector holder (89) that is detachably clamped in a connected state with the lead cord is housed in the inner partition plate so that it can be pulled out between the inner partition plate and the partition plate. An optical wiring rack, which is attached to an end portion on a front surface side which is a drawn side.   The switching optical connector (86) that terminates the optical fiber (78) drawn from the optical branching module so as to be connectable to the lead cord (88) drawn from the optical switch is an MT type optical connector. The optical wiring rack according to claim 1, wherein:   The optical wiring rack according to claim 1 or 2, further comprising extra length storage means (90) for storing an extra length (54a, 76a) of an optical fiber in the vicinity of the connector holding means.

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