JP2001136652A - Subscriber metallic cable introduction structure for overhead onu - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a subscriber metallic cable introduction structure for an overhead ONU by which the subscriber metallic cable can be introduced into/removed from the overhead ONU easily. SOLUTION: A metallic cable 5 which is terminated by a subscriber connector 6 is introduced into the moisture-proof housing of an overhead ONU through one (for instance 32c) of introduction holes arranged in a rubber seal 3 provided near the contact point between the housing and the cover. A slit 33c reaching the introduction hole 32c is formed in the upper surface of the rubber seal 3. If the rubber seal 3 is bent as shown in the figure, the line-shaped slit 33c is opened into a fan shape and the cable 5 can be fitted to the introduction hole 32c. Since the respective circumferences of the introduction holes 32 are thinned in circular shapes, the cables 5 can be fitted to the introduction holes 32 easily. Therefore, the metallic cables 5 can be installed easily after the cables are terminated by connectors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber's metal cable of an imaginary ONU which can easily introduce a subscriber's metal cable to an imaginary ONU (abbreviation of an optical network unit) in an optical subscriber transmission system. Regarding the introduction structure.

[0002]

2. Description of the Related Art A fictitious ONU of an optical subscriber transmission system is:
A multiplexed optical signal transmitted from a master station via an optical fiber cable (hereinafter, an optical cable) is terminated to reproduce an electric signal to be transmitted to each of a plurality of subscribers. Each of these electric signals is distributed to each of a plurality of subscribers via a corresponding metal cable. Signals transmitted from each of the subscribers to the master station are sent to the fictitious ONU via the metal cable. The fictitious ONU multiplexes signals from a plurality of subscribers, converts them into optical signals, and sends them to the master station. The overhead ONU is suspended and fixed on a support line of an overhead optical cable supported by a telephone pole.

[0003] Here, the fictitious ONU housing is:
It must be waterproof, and the optical cable, the metal cable, and the power line must be introduced into the housing. An optical subscriber transmission system using a fictitious ONU is described in JP-A-9-321706.

[0004] Hereinafter, a schematic structure of a conventional ONU according to the present invention shown in FIG. 1 and a conventional rubber seal 3A shown in FIG. 5 will be described with respect to a conventional structure for introducing a metal cable for connecting a subscriber terminal to an imaginary ONU. It will be described with reference to FIG.

Referring to FIG. 1, an electric circuit (not shown) including an optical circuit and a power supply circuit of the overhead ONU is accommodated in an accommodating portion 4 in a waterproof and box-shaped housing 1. Although the upper surface 12 is open, the lid 2 is connected by a hinge structure or the like (not shown) provided on a side surface of the housing 1 (for example, a lower side surface in (b) of FIG. The upper surface 12 of the housing 1 is closed by the lid 2 when fixed with a stopper (not shown) provided on the side opposite to the above-described side. The opening on the side surface of the housing 1 (the upper surface 1
2) is fitted with a packing, and when the lid 2 is fixed at the contact surface 11 with the lid 2 with the above-mentioned stopper, the overhead O
The inside of the NU (housing unit 4) has a waterproof structure (waterproof casing) with respect to the outside.

Next, referring to FIG. 1 and FIG. 5, the cable 5 which is a metal cable is introduced into the housing 1 from the subscriber line inlet 51A of the elastic rubber seal 3A attached to the housing 1. The rubber seal 3A is formed by cutting the lower part of the rubber seal 3A at the center in the thickness direction into the contact portion 14 which is the tip of the flange 13 in which a part of the contact surface 11 (upper surface 12) with the lid 2 of the housing 1 is cut down. It is fitted and attached until the bottom surface of the lacking gap portion 57 hits. Rubber seal 3
When the upper surface 36A, which is the end surface of A, is pressed by the lid 2, the lid 2 and the upper surface 36A of the rubber seal 3A are connected to each other, and the bottom surface of the gap 57 between the abutting portion 14 of the flange 13 and the rubber seal 3A (see FIG. (Upper side) and the housing 1 is completely waterproofed. Since the cable 5 is required for each of a plurality of subscribers, the rubber seals 3A are arranged or arranged in a horizontal direction as, for example, seven subscriber line introduction ports 51A from introduction holes 51a to 51g. All of the introduction holes 51a to 51g of the rubber seal 3A are formed above the contact portion 14 (on the side of the lid 2), and the diameter of the hole penetrating in the thickness direction of the rubber seal 3A is slightly smaller than the outer diameter of the cable 5. .

[0007] For example, the introduction hole 5 of the (housing 1) of the imaginary ONU.
In order to introduce the cable 5 into 1c, the cable 5 is pushed into the inside of the housing 1 so as to widen the diameter of the introduction hole 51c at the end of the cable 5 and penetrate it. Therefore, since the introduction hole 51c is in close contact with the cable 5, waterproofness of the cable 5 is ensured. After the cable 5 is pushed into the introduction hole 51c and penetrates the introduction hole 51c, the cable 5 and the connector 6 for the subscriber are terminated. The terminated connector 6 is connected to a connector (not shown) having terminals corresponding to the number of the introduction holes 51, and connection between the subscriber terminal and the imaginary ONU is performed.

The rubber seal 3A has an earth wire inlet 54A including introduction holes 54a and 54b for introducing an earth wire into the overhead ONU. Ground wire inlet 54
The description of A is omitted because the hole diameters of the introduction holes 54a and 54b are only different from the hole diameters of the introduction holes 51a to 51g of the cable 5.

[0009]

According to the above-mentioned prior art ONU subscriber metal cable introduction structure according to the prior art, the subscriber metal cable is inserted into the cable introduction hole of the housing of the overhead ONU and then joined to the metal cable. Since the connector 4 for the user is terminated, not only a large working space is required inside the housing, but also a fine work for penetrating the metal cable into the cable introduction hole is required, and the length is long. There was a drawback that it required working time.

Accordingly, an object of the present invention is to solve the above-mentioned drawbacks, to easily introduce and remove a subscriber's metal cable to and from an imaginary ONU, and to greatly reduce the time required for these operations. To provide a subscriber metal cable introduction structure.

[0011]

SUMMARY OF THE INVENTION A fictitious ONU according to the present invention
Has a waterproof housing which is imaginary and houses optical and electric circuits, and distributes optical signals input / output to / from the waterproof housing and subscriber signals from a plurality of subscribers. An introduction structure for a subscriber metal cable of an imaginary ONU to be synthesized, wherein the metal cable is arranged in the waterproof housing near a contact point with a lid of the waterproof housing, and each of a plurality of arranged introduction holes of the metal cable. It is characterized by comprising a rubber seal provided with a slit from each to the upper end surface on the lid side.

[0012] One of the subscriber metal cable introduction structures of the aerial ONU may have a configuration in which the thickness of each of the introduction holes is circularly thinner than the surrounding rubber seal.

One of the subscriber metal cable introduction structures of the overhead ONU has a configuration in which the diameter of each of the introduction holes before the introduction of the metal cable is slightly smaller than the outer diameter of the metal cable. Can be taken.

Another one of the subscriber metal cable introduction structures of the aerial ONU has a configuration in which the rubber seal has a plurality of ground wire introduction holes arranged in the same manner as the metal cable introduction holes. Can be.

Another one of the above-mentioned subscriber metal cable introduction structures of the aerial ONU is a structure in which the waterproof casing fits a lower portion of the rubber seal into a flange obtained by cutting down a part of a contact surface with the lid, Further, it is possible to adopt a configuration in which the upper end surface of the rubber seal has a structure that can be in close contact with the lid.

Still another one of the subscriber metal cable introduction structures of the aerial ONU is such that a connector connected to the metal cable and introduced into the housing is provided when the metal cable is introduced into the introduction hole. A configuration in which the metal cable is terminated in advance may be employed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a subscriber metal cable introduction structure of an imaginary ONU according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic structural view of an imaginary ONU according to the present invention, in which (a) is a side view, and (b) is a top view with a lid 2 removed. 2 is a structural view of the rubber seal 3 shown in FIG. 1, (a) is a side view, and (b) is A in FIG.
It is 1-A2 sectional drawing.

Since the housing 1, lid 2 and connection structure of the overhead ONU shown in FIG. 1 are the same as those described in the section of the prior art, the same description will be omitted. The housing 1 and the lid 2 are often made of plastic such as polypropylene. Further, the bottom surface of the space portion 37 in which the lower central portion in the thickness t1 direction of the rubber seal 3 is cut off is a contact portion of the flange 13 in which a part of the contact surface 11 (upper surface 12) with the lid 2 of the housing 1 is cut down. It is the same as the prior art that the rubber seals 3 are fitted to the flanges 13 of the housing 1 and the fittings 38 located on both sides of the gap 37 are brought into close contact with each other until they hit 14.

The main feature of the present invention lies in the structure of the rubber seal 3 shown in FIGS. The rubber seal 3 can use elastic natural rubber or synthetic rubber. The use of EPDM rubber as a synthetic rubber is recommended.

Referring to FIG. 1 and FIG.
On the upper surface 36 side of the spacing portion 37, there are arranged subscriber line introduction ports 31 through which a plurality of metal cables can be separately introduced from outside to inside of the housing 1. Subscriber line entrance 3 in this example
In 1, seven introduction holes 31 a to 31 g for introducing one metal cable for a subscriber line are arranged in parallel with the upper surface 36 (see FIG. 2A). The inside diameter of each of the introduction holes is a straight line slightly smaller than the outside diameter of the metal cable (metal cable 5 described later) to be introduced.

The rubber seal 3 is provided with introduction holes 31a to 31a.
g is provided with introduction parts 32a to 32g, respectively. The introduction section 32 shortens the length of the introduction hole 31 from the thickness t1 of the rubber seal 3 to a length t2 in a circular shape (thinning), thereby facilitating introduction and removal of the metal cable into and from the housing 1. In order to provide Introduction section 3
Reference numeral 2 denotes a portion corresponding to the outside and inside of the housing
It is hollowed out with an inner diameter larger than 1. With this structure, the thickness of each of the introduction holes 31 is reduced, and introduction and removal of the metal cable from and to the housing 1 are facilitated. In addition, the rubber seal 3 is disposed diagonally upward from each of the introduction holes 31a to 31g to form an upper surface 3 which is an end surface for the lid 2.
6 are provided with slits 33a to 33g obtained by cutting the rubber sheet. These slits 33a to 33g are also structures for facilitating introduction and removal of the metal cable. In addition, if the slits 33a to 33g are provided obliquely upward from the respective holes, the waterproof effect is increased. Furthermore, when the introduction holes 51a to 51g are aligned,
The force when the cable 5 is introduced into the introduction hole 31 becomes uniform, and the operation of introducing the cable 5 becomes easy.

The rubber seal 3 also has two ground line inlets 34 arranged beside the subscriber line inlet 31. Since the outside diameter of the earth wire into which the hole diameter of the introduction hole 34 is introduced is larger than the outside diameter of the above-mentioned metal cable, the introduction hole of the earth wire is also introduced into the introduction holes 31a to 31g.
Since the hole diameter is only slightly larger than the hole diameter, detailed description on the introduction of the ground wire into the housing 1 is omitted.

FIG. 3 is an explanatory view for introducing the cable 5 into the rubber seal 3. FIG. 4 is a diagram in which the cable 5 is introduced into the rubber seal 3. Hereinafter, a method for introducing the cable 5 from the rubber seal 5 into the housing 1 will be described.

Referring to FIG. 1 and FIG. 3 together, an imaginary ON
One of the metal cables to be introduced from the rubber seal 5 into the U case 1 is a cable 5, and the cable 5 is introduced into the case 1 from the introduction hole 31 c of the subscriber line introduction port 31. To introduce the cable 5 into the housing 1, first, the rubber seal 3 is removed from the housing 1. Next, as shown, the upper surface 36 is most open at the position of the introduction hole 31c,
The rubber seal 3 is bent so that the lower surface 35 at that position is most contracted. Then, the slit 33c of the introduction hole 31c opens in a sector shape from the linear shape as shown in the figure. In this state, cable 5
Is pushed in a fan-shaped slit 33c, that is, in the direction A, the cable 5 pushes open the slit 33c and the introduction hole 31c, and the cable 5 fits into the hole of the introduction hole 31c of the rubber seal 5.

Referring to FIGS. 1 and 4 together, in FIG. 4, the cable 5 fits into the hole of the introduction hole 31c and the rubber seal 3
3 shows a state in which the bending of the object has been eliminated. In this state, the jacket of the cable 5 is in close contact with the inner diameter of the introduction hole 31c,
The introduction hole 31c can keep waterproof. In addition, the sheath of the cable 5 is often made of PVC plastic or the like. When all the cables 5 are fitted into the predetermined introduction holes (subscriber line introduction ports) 31, the rubber seal 3 is attached to the housing 1 as described above, and the cables 5 are introduced into the housing 1. here,
The connector 6 such as a PAT connector is preferably terminated (connected) to the cable 5 before the cable 5 is fitted into the rubber seal 3. By terminating, it is not necessary to attach the connector 5 to the cable 5 in a narrow place in the housing 1, and the introduction of the cable 5 including the connector 6 to the housing 1 is extremely easy. Can be a fictional ONU
This has the effect of significantly reducing the installation work time.

The cable 5 is connected to the housing 1 due to a failure of the overhead ONU or the like.
When removing from the case 1, after opening the lid 2 of the case 1, the connector 6 is detached from the connector built in the case 1, and the rubber seal 3 is detached from the case 1. Also in this case, since the detachment of the connector 6 from the cable 5 can be performed in a wide place outside the housing 1, the operation is extremely easy.

[0028]

As described above, the present invention has a waterproof housing which is imaginary and houses an optical / electrical circuit, and an optical signal input / output to / from the waterproof housing and a signal from a plurality of subscribers. An installation structure for a subscriber metal cable of an imaginary ONU for distributing and synthesizing subscriber signals, wherein said metal cable is arranged in said waterproof housing near a contact point of said waterproof housing with a lid, and a plurality of said metal wires are arranged. Since a rubber seal provided with a slit from each of the cable introduction holes to the upper end surface on the lid side is provided, the metal cable terminated with the connector for the subscriber is removed from the slit provided in the metal cable introduction hole of the rubber seal. The metal cable can be introduced into the housing, and the installation and removal of the metal cable to and from the housing at the time of installation work and failure of the overhead ONU become extremely easy. Effect that the working time at the time of installation work and failure of barrel cable can be greatly reduced is large.

[0029]

[Brief description of the drawings]

FIG. 1 is a schematic structural view of an imaginary ONU according to the present invention, (a) is a side view, and (b) is a top view with a lid removed.

FIG. 2 is a structural view of a rubber seal 3 shown in FIG. 1,
(A) is a side view, (b) is A1-A2 sectional drawing of (a) figure.

FIG. 3 is an explanatory diagram for introducing a cable 5 into a rubber seal 3;

FIG. 4 is a view in which a cable 5 is introduced into a rubber seal 3;

5A and 5B are structural views of a rubber seal 3A according to the related art, in which FIG. 5A is a side view, and FIG. 5B is a sectional view taken along line B1-B2 of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 housing 2 lid 3 rubber seal 4 housing portion 11 contact surface 12 top surface 13 flange 14 contact portion 31 subscriber line introduction port 31a to 31g introduction hole 32a to 32g introduction section 33a to 33g slit 34 ground line introduction port 35 bottom surface 36 top surface 37 spacing part 38 fitting part

Continued on front page F-term (reference) 5G361 AA07 AB09 AC04 AC11 5G375 AA09 BA27 BB10 BB11 BB12 BB19 BB24 CC02 DB16 DB26 DB41 EA04

Claims (6)

[Claims] 1. An imaginary ONU having a waterproof housing that is imaginary and houses an optical / electrical circuit, and distributes and combines an optical signal input / output to / from the waterproof housing and subscriber signals from a plurality of subscribers. The structure for introducing a subscriber metal cable according to (1), wherein the cover is disposed on the waterproof housing near a contact point with the lid of the waterproof housing, and the lid is provided from each of a plurality of arranged introduction holes of the metal cable. A rubber seal provided with a slit up to an upper end surface on the side thereof.
NU subscriber metal cable introduction structure. 2. The installation structure according to claim 1, wherein the thickness of each of the introduction holes is made circularly thinner than the surrounding rubber seal. 3. The fictitious ONU according to claim 2, wherein the diameter of each of the introduction holes before introducing the metal cable is slightly smaller than the outer diameter of the metal cable. Metal cable introduction structure. 4. The waterproof housing has a structure in which a lower portion of the rubber seal is fitted into a flange obtained by cutting down a part of a contact surface with the lid, and a structure in which an upper end surface of the rubber seal can be in close contact with the lid. The fictitious ONU according to claim 1, wherein
Subscriber metal cable introduction structure. 5. A connector connected to said metal cable and introduced into said housing, said connector being previously terminated to said metal cable when said metal cable is introduced into said introduction hole. Item 3. The structure for introducing a subscriber metal cable of an imaginary ONU according to claim 1 or 2. 6. The installation structure of a subscriber metal cable of an imaginary ONU according to claim 2, wherein the rubber seal is arranged with a plurality of grounding hole introduction holes having the same configuration as the metal cable introduction hole. .