JP2000243154A - Feeder line composite type optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To insure power supply for installation work of an outdoor optical network terminal end device and easily connect to the power supply by winding feeder lines on the outer circumference of an assembling drop optical fiber cable, reversing the stranded direction of the feeder line to the stranded direction of optical units, and making differ the strand pitch from the strand pitch of the optical units. SOLUTION: A feeder line composite type optical fiber cable C is constituted so that two solid wires 3, 3 are wound on the outer circumference of an assembling drop optical fiber cable which is stranded with many optical units 2 around a plurality of supporting wires 1. The stranded direction of the solid wires 3, 3 is reverse to the stranded direction of the optical units 2, and the strand pitch is made differ from the strand pitch of the optical units 2 so as to function as a lashing wire. Consequently, without loosening the optical units 2 to be separated, the solid wires 3, 3 are used as a feeder line, and power supply can be insured regardless of the condition of the installed place of an optical network terminal end device. Hereby the cost of the installation work and branching work can be reduced inexpensively by the simple construction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collective optical network terminating apparatus (optical network) capable of accommodating about 10 lines of optical fiber cables, in particular, services such as analog telephones, INS network 64, and analog dedicated services.
A new optical access system (π system) in which a unit (hereinafter referred to as “ONU”) is installed near a subscriber and a necessary signal is transmitted from the ONU to each subscriber.
The optical fiber cable structure for
The power supply required for the NU can be easily secured, and the branching operation from the collective drop optical fiber cable to the metal communication line by the ONU can be performed easily and efficiently.

[0002]

2. Description of the Related Art An outline of an optical fiber communication system is shown in FIG. 3, in which a high-density optical fiber cable 11 connected to a central office is connected to an access point closure 1.
2, the collective drop optical fiber cable 13 is branched.
Metal communication line 1 for drawing in a subscriber via NU14
Branched to 5. Collective drop optical fiber cable 13
To connect to the metal communication line 15, the ONU 14 must convert an optical signal into an electric signal, and for that purpose, the ONU 14 must be connected to a power supply. ONU1
In the case where 4 is installed indoors (when an optical fiber cable is connected to a metal communication line indoors), there is no particular problem in securing power because indoor commercial power can be used. However, a separate power supply must be secured outdoors. If a commercial power supply is used, it must be connected to the ONU 14. However, in some areas, it is very difficult to secure this power source, and there is a problem that the installation requires a lot of labor and the installation cost increases.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to secure a power source and easily connect a power source to an ONU in an outdoor installation work of an ONU. ONU using cable
It is an object of the present invention to devise a structure of a collective drop optical fiber cable so that power can be supplied to the optical fiber cable.

[0004]

Means taken to solve the above problems are constituted by the following elements (a) and (b). (A) A feed line is wound around the outer periphery of the collective drop optical fiber cable to form a feed line composite type optical fiber cable. (B) The twist direction of the feed line is opposite to the twist direction of the optical unit, and the twist pitch Is different from the twist pitch of the optical unit.

[0005]

[Operation] By connecting the power of the feeder composite optical fiber cable to the commercial power supply at the connection end with the optical fiber cable, the power from the commercial power supply is supplied to the other end of the feeder composite optical fiber cable. . Therefore, when the ONU is connected to the feeder composite optical fiber cable, power can be supplied from the feeder by connecting the power supply terminal of the ONU to the feeder.

[0006]

Next, an embodiment will be described with reference to the drawings. The optical fiber cable (collective drop optical fiber cable) of this embodiment is formed by twisting a large number of optical units 2 around a support wire 1 in which a plurality of tensile wires (tension members) are twisted in the same manner as the conventional one. It is configured.

[0007]

First Embodiment A feeder composite optical fiber cable C of the embodiment shown in FIG. 1 is formed by winding two single wires 3 and 3, and the twist direction is opposite to the twist direction of the optical unit 2. . In order to make the outer diameter of the feeder composite optical fiber cable C as small as possible, it is desirable that the diameter of the single wire 3 be as small as possible. However, it is necessary to make the electric resistance as small as possible and secure the required tensile force. Therefore, it must meet these requirements. The wire diameter of the single wire 3 of this example is 2.0 to 2.6 mm,
The wire diameter of the single wire 3 itself is 4.0 to 5.0 mm. The reason why the twist pitch is different from the twist pitch of the optical unit 2 is to allow the single wires 3 and 3 to function (tie and tighten) as lashing wires, thereby preventing the optical unit 2 from loosening. It is necessary to make the twist pitch of the optical unit 2 shorter than the twist pitch of the optical unit 2. However, in the embodiment of FIG. Can be increased by minutes.

[0008]

[Embodiment 2] In the embodiment shown in FIG.
The twist direction is opposite to that of the optical unit 2, and the twist pitch of the flat pair wire 4 is shorter than the twist pitch of the optical unit 2, but is smaller than the twist pitch of one single wire 3. Make it longer and function as a lashing wire. Regarding the wire diameter of the metal wire of the flat pair wire 4, FIG.
This is the same as the embodiment.

[0009]

[Others] It is also possible to make the feed line concentric in order to make it a pair line. However, in this case, the diameter of the feed line becomes extremely large, and therefore, the outer diameter of the feed line composite type optical fiber cable becomes large, which is not a desirable embodiment.

[0010]

[Effect] Since the power supply line is wound around the optical unit of the collective drop optical fiber cable to form a power supply line composite type optical fiber cable, power is secured regardless of the installation location of the ONU. Branching work can be performed easily and efficiently, and there is no need for separate equipment and work to secure the power supply.
The cost of branching work by U can be significantly reduced. In addition, since the power supply line around which the power supply line is wound outside the optical unit functions as a lashing wire, the optical unit is prevented from being loosened and loosened.
It is possible to avoid a decrease in workability due to the fact that the optical unit is separated during the work of attaching the NU. Further, since the feed line composite type optical fiber cable of the present invention has a simple structure in which the feed line is wound around the optical unit of the conventional collective drop optical fiber cable, the manufacturing cost is extremely low. Further, since the power supply by the power supply line of the power supply line composite type optical fiber cable is not limited to the ONU, other devices (for example, work lighting) used and installed adjacent to the power supply line composite type optical fiber cable are used. Is also possible,
As a result, the effective use range of the collective drop optical fiber cable is expanded.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a sectional view of a second embodiment.

FIG. 3 is a conceptual diagram of a conventional optical fiber communication system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Support line 2 ... Optical unit 3 ... Single line 4 ... Flat type pair wire 11 ... Optical fiber cable 12 ... Access point closure 13 ... Collective drop optical fiber cable 14 ... ONU (Optical Network Terminator) 15 ... Metal communication line C ... Feed line composite type optical fiber cable

Continuing from the front page (71) Applicant 000005290 Furukawa Electric Co., Ltd. 2-6-1 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Shin Saito 1440, Mukurosaki, Sakura-shi, Chiba Pref. Inventor Kazunaga Kobayashi 1440 Mutsuzaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Plant, Inc. 1440 Rokuzaki, Tokyo, Japan Inside Fujikura Sakura Factory (72) Inventor Kimio Ando 3-2-1-2 Nishishinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor Taiji Murakami Nishishinjuku-san, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Co., Ltd. (No. 72) Nippon Telegraph and Telephone Corporation (72) Inventor Yoshiyuki Suetsugu 1 Tayacho, Sakae-ku, Yokohama, Kanagawa Prefecture Sumitomo Electric Industries, Ltd.Yokohama Works (72) Inventor Masami Hara 2-Chome, Marunouchi, Chiyoda-ku, Tokyo No.6-1 Furukawa Electric Co., Ltd. In-house F term (reference) 2H001 BB23 BB27 DD04 DD10 FF02 5G313 AA06 AB01 AB10 AC12 5G319 HA08 HA10 HB05 HC01 HD02 HE04 HE20

Claims (3)

[Claims] A feed line is wound around the outer periphery of a collective drop optical fiber cable, and the twist direction of the feed line is opposite to the twist direction of the optical unit, and the twist pitch is different from the twist pitch of the optical unit. cable. 2. The feed line composite type optical fiber cable according to claim 1, wherein said feed line is a single line. 3. The feed line composite type optical fiber cable according to claim 1, wherein said feed line is a flat pair wire.