JPH0449726B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for configuring an optical/conductor composite transmission line.

When composing an optical/conductor composite cable by combining an optical fiber cable with a conductor cable such as a copper cable, the single length of the optical fiber cable (the length of one product) is usually over 1000 meters, whereas the conductor cable is Since the maximum single length of the cable is about 500 meters, the length of the composite cable that can be obtained is limited to less than the length of the conductor cable, and the advantage of optical fiber cable, which is that it can be made into longer lengths, is completely lost. I'll get lost.

The present invention has been made in view of the above-mentioned circumstances, and its object is to obtain a composite optical/conductor transmission line that takes advantage of the advantage of optical fiber cables that they can be extended in length.

The configuration of the present invention to achieve this objective is as follows:
The method is characterized in that a plurality of conductor cables each having a built-in pipe are arranged and laid in advance in the longitudinal direction, and then an unconnected optical fiber cable having the length of several conductor cables is passed through the pipes of these conductor cables. shall be.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for configuring an optical/conductor composite transmission line according to the present invention will be described in detail based on embodiments shown in the drawings.

In the drawings, reference numeral 1 denotes a conductor cable such as a copper cable for communications, signals, power, control, etc., and a pipe 2 for passing an optical fiber cable is built in over the entire length. Although the built-in position of the pipe 2 may be at a position shifted from the center of the conductor cable 1, the one provided in the center is adopted here.

A plurality of these conductor cables 1 are arranged and laid in the longitudinal direction as shown in the figure, and then an unconnected optical fiber cable 3 is drawn into the pipe 2 over all the plurality of conductor cables 1.

Since the single length l ₁ of the optical fiber cable 3 is longer than the single length l ₂ of the conductor cable 1, at the connection point 4 between the conductor cables 1, the optical fiber cable 3 only needs to be pulled through and does not need to be connected. In other words, the length of the optical fiber cable 3 does not need to match the length of the conductor cable 1, and may be passed through the plurality of conductor cables 1 as long as it is.

When making this composite transmission line even longer, the plurality of conductor cables 1 and optical fiber cables 3 described above are required.
It is only necessary to connect a plurality of units, with the combination of At the connection point 5 between each unit, not only the conductor cables 1 but also the optical fiber cables 3 are connected. Reference numeral 6 indicates a connection point between the optical fiber cables 3.

Next, a configuration example with specific numbers will be shown.

A multi-pair communication cable with a single length of 500 m, which has a built-in pipe with an inner diameter of approximately 9 mm in the center of the cable, and a single length
When constructing a composite transmission line using a 2,000 m, small-core optical fiber cable with an outer diameter of about 7 mm, first a pipe-in communication cable is installed, and then an optical fiber cable is installed inside the pipe. At communication cable connection points every 500m, optical fiber cables will be passed through.
Optical fiber cables and communication cables are connected every 2000m. If you try to make a composite cable of optical fiber cable and conductor cable from the beginning, the single length of the composite cable will be at most 500 m, so to obtain a 2000 m composite cable, communication cables should be connected at three points, and optical fiber cables should be connected at three points. However, if we look only at the 2000 m composite transmission line, there is no need to connect optical fiber cables. In addition, when passing the optical fiber cable through a pipe, it is also possible to pass a pull rope such as a nylon string through the pipe in advance using air currents, etc., and then use that pull line to pull the optical fiber cable into the pipe. It's good, and I'll see you in JP-A-51-
The optical fiber cable may be drawn into the pipe by the method described in Japanese Patent No. 76592 or the like.

Furthermore, in order to pass optical fiber cables through multiple pipes lined up in the longitudinal direction, after passing multiple lengths of optical fiber cables through one pipe, pass the length of the previous pipe to the next pipe. By removing the remaining length of the optical fiber cable and repeating this process, you can run the optical fiber cable through all the pipes. Alternatively, you can use the method of guiding the optical fiber cable straight between pipes to the next pipe and applying supplemental tensile force at the straight part, without allowing excess length between the pipes. You can pull in fiber optic cables.

As explained in detail above, according to the method for configuring a composite transmission line according to the present invention, a conductor cable such as a copper cable and an optical fiber cable are combined as separate cables, so that the optical fiber cable has the same length as the conductor cable. Although it is a composite transmission line of conductor and optical fiber, the length of the optical fiber cable can be increased regardless of the In addition, since optical fiber cables are threaded through multiple connection points of the conductor cable to form a composite transmission path, the number of connection points of the optical fiber cable can be reduced compared to conductor cables (conventional composite cables). Therefore, the cost of the entire transmission line can be lowered, and the relay distance can be increased by reducing the connection loss of the optical fiber cable.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of an embodiment of a method for configuring a composite transmission line according to the present invention. 1 is a conductor cable, 2 is a pipe, 3 is an optical fiber cable, 4 is a connection point between conductor cables, 5
6 is a connection point including both conductor cables and optical fiber cables, and 6 is an optical fiber cable connection point.

Claims (1)

[Claims] 1. A method of laying a plurality of conductor cables with built-in pipes arranged in the longitudinal direction in advance, and then passing an unconnected optical fiber cable having the length of several conductor cables through the pipes of these conductor cables. A method for configuring a characteristic optical/conductor composite transmission line.