JPH0414941A - Replacement method of communication cable - Google Patents

Abstract

PURPOSE:To replace a CCP cable without hindrance even when a subscriber is busy by executing fiber identification through the use of a test line, connecting an active line and the test line in parallel, twisting manually each of new core wires with each of active core wires, soldering them, and cutting off the active core wires. CONSTITUTION:A 1st connection means 4 is connected tentatively to a quad core wire 1a to be executed fiber identification of an active CCP cable (communication cable) 1A, a 2nd connection means 8 is sequentially in contact with the core wire 1a and the 2nd connection means 8 is tentatively connected with the core wire 1a after check of the lighting of a light emitting diode 5. Then a changeover device 3 is selected to connect the core wire 1a to a quad core wire 22a for a test line of a newly installed CCP cable 2A in parallel, the prescribed quad core wire 21a whose fiber identification is finished in the CCP cable 2A is twisted manually and soldered at prescribed positions 9, 10 of the core wire 1a and the core wire 1a is cut off. Thus, the cable replacement work is implemented without giving a trouble to subscribers.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a method for converting existing communication cables (cables whose conductors are coated with color-coded polyethylene, hereinafter referred to as CCP cables) into communication lines. Concerning how to replace the cable with a newly installed CCP cable while still using it.

[Conventional technology]

Traditionally, the work of replacing an existing CCP cable with a newly installed CCP cable involves borrowing a communication (telephone) line from the subscriber (usually the subscriber is notified before the work is done), and monitoring the communication line. , check that it is not in use, and
After checking the color code of the core of the CCP cable for each line on the central office side and the subscriber side in the section where the CP cable is to be replaced, cut the existing CCP cable and replace it with the new CC cable.
I twisted and soldered the core wires of the p-cable, connected them, and replaced them.

[Problem B to be solved by the invention] However, in the above-mentioned exchange method, the work was carried out only after notifying many subscribers in advance, obtaining their consent, and confirming that no calls were being made. However, there were problems in that it required a lot of time and caused trouble to subscribers, albeit temporarily.

In addition, simply checking the color code of the core wire of the CCP cable will not work if there is a connection point in the middle of the section to be replaced.
When construction was carried out in the past, there was a risk of incorrect connection failures if the connections were made in different colors.

The present invention eliminates the need for prior notification of construction work to subscribers, which was a problem with the above-mentioned conventional technology, does not cause inconvenience to subscribers, and also eliminates the need to rely on color codes to compare the cores of CCP cables. The purpose is to enable cable replacement work to be carried out.

1. Means for Solving the Problems] In order to solve the above problems, the present invention aims to solve the problems described above.
In the method of exchanging the cable with a newly installed CCP cable, a four-stage 1
An interlocking switching device with two circuit contacts, connected to each fixed contact terminal of the switching device, and connected to the fixed contact terminal and the CC in current use.
A first connecting means for (N) connecting one end of each core wire of a quad that performs core wire comparison of the P cable, and a first switching contact terminal and a second switching contact terminal of each of the interlocking switch. The light emitting diode, DC power supply, and reverse voltage protection diode connected in series between them, and one end of each core wire of the quad set as a test line in the newly installed CCP cable are respectively connected to the second switching contact terminal. and a second connecting means connected to the other end of each of the cores to search for and connect the other end of each of the cores of the quad that performs the fiber comparison, thereby forming a fiber comparison circuit. The interlocking switch is set to the first switching contact side, the first connecting means is connected to each of the cores to be compared, and the second connecting means is used to connect each of the cores. After searching for the other end and confirming that the light emitting diode is lit, the second connection means is connected to each core wire, the interlocking switch is switched to the second switching contact side, and the above confirmation is performed. Each core wire of the newly installed CCP cable was connected in parallel with each core wire of the test line quad, and each core wire of the predetermined quad of the newly installed CCP cable was manually twisted at a predetermined location of each of the confirmed core wires. Soldering, removing the first and second connecting means, and cutting each of the confirmed core wires at predetermined locations were carried out on each quad.
Replace the CP cable with a new CCP cable.

Note that two core comparison circuits are formed for each line, but incorrect connections can be avoided by reversing the orientation of the light emitting diode, DC power supply, and reverse voltage protection diode connected in series to each circuit. To prevent.

[Function] Since the present invention is configured as described above, for every two circuits of the currently used CCP cable, one quadruple circuit and two circuits of the newly installed test circuits of the CCPC cable are used. Conduct a core comparison, connect the currently used line and the test line in parallel using an interlock switch, and connect the core wires of the two lines of the newly installed CCP cable with the specified strength of 7 C to the cores of the two lines currently in use. After hand-twisting and soldering the wires, the core wires of the two lines currently in use are cut, so CCP can be used without any problem even when the subscriber is on the phone.
This allows you to replace the cable.

[Example] Figure 1 is an explanatory diagram of the work procedure of the present invention, and the figure is a CCP
It is an explanatory view about one core wire among a plurality of quads which constitute a cable.

In FIG. 1, IA is the currently used CCP cable, 1 is the fiber reference quad, 1a is the fiber of the fiber reference quad, 2A is the newly installed CCP cable, 21a is the fiber of the predetermined quad,
22a is the core wire of the test line quad, 3 is the switching device, 3a
is a fixed contact terminal, 3b is a first switching contact terminal, 3C is a second switching contact terminal, 4 is a first connection means, 5 is a light emitting diode, 6 is a DC power supply, 7 is a diode for reverse voltage protection, 8 is a second connection means, 9 and 10 are locations where the core wire 21a is twisted and soldered by hand, and 11.12 is a location where the core wire 1a is cut.

To replace CCP cables, workers are stationed on both the station and subscriber sides in the section where the CCP cable is to be replaced, and a telephone line is established between the two for communication. This is carried out in four steps as shown in FIG.

In step 1, the switch 3 on the station side is set to the first switching contact 3b side, and the first connecting means 4 is connected to the core wire 1a of the quad that is to be compared with the core wires of the CCP cable IA currently in use. A worker on the subscriber side sequentially contacts the second connecting means 8 with the core wire 21a of the fiber control quad, and when the operator on the station side contacts the light emitting diode 5 to turn on, connects the core wire 1a with the second connecting means 8. The second connection means 8 is connected.

In step 2, the operator on the station side connects the switch 3 to the second switching contact 3.
When switching to the C side, core wire la is connected to the newly installed CCP cable 2.
It is connected in parallel with the core wire 22a of the customer's line quad.

In step 3, the station side and subscriber side workers install the newly established CCP.
Core wire 2 of a predetermined quad of cable 2A
1a are hand-twisted and soldered at predetermined locations 9 and 10 of the core wire 1a to completely connect them.

In step 4, remove the first connecting means 4 on the central office side and the second connecting means 8 on the subscriber side from the core wire 1a, which were previously connected, and disconnect the core wire 1a at predetermined cutting points 11 and 12. Cut off and complete the replacement work.

The above operations are performed in step 1 for one power port, two lines, and four core wires, and then steps 2 and subsequent steps are performed all at once.

FIG. 2 is a connection diagram of a specific embodiment of the present invention.

In FIG. 2, S, -S indicate that four switchers 3 in FIG. 1 are interlocked, LEDI to LED4 are the light emitting diodes 5 in FIG. In the DC power supply 6, D1 to D4 form four switching circuits corresponding to the reverse voltage protection diodes shown in FIG. 1, respectively. [Test] - The core wire 22a and core wire 22b of the line quad 22 are set as the No. 1 wire, the core wire 22c and the core wire 22d are set as the No. 2 wire, and the polarity of each element of the switching circuit connected to each wire is reversed. By connecting, for example, the second connecting means 8a, 8b connected to the conductors 22a and 22b of the first conductor are connected to the conductors 1a, lb of the conductor comparison quad in the opposite way, but Although the loop is possible, current does not flow through the two switching circuits, so L
Neither ED nor LED emits light. Therefore, the second connecting means 8 is connected so that the LED or LED 2 emits light independently.
By changing the connection of a and 8b, the core wires can be reliably compared.

(Effects of the Invention) As described in detail above, according to the present invention, when replacing the currently used CCP cable with a newly installed CCP cable, there is no need to notify the subscriber in advance, and there is no need to notify the subscriber in any way. This has the effect that replacement work can be carried out efficiently and reliably for every two lines without causing any inconvenience.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the working procedure of the present invention, and FIG. 2 is a connection diagram of a specific embodiment of the present invention. IA... CCP cable currently in use, 1... Core wire comparison quad, 1a... Core wire of core wire comparison quad, 2A...
Newly installed CCP cable, 21...Predetermined quad, 21
a... Core wire of predetermined quad, 22... Test line quad, 22a, 22b, 22c, 22d-... Core wire of test line quad, 3... Switch, 3a... Fixed Contact terminal, 3b...first switching contact terminal, 3C...
Second switching contact terminal, 4... First connection means, 5...
- Light emitting diode, 6... DC power supply, 7... Diode for reverse voltage protection, 8... Second connection means, 9, 1
0: Hand-twisted soldering area, 11.12: Cutting area. Patent applicant Nippon Telegraph and Telephone Corporation

Claims (1)

[Scope of Claims] 1. A communication cable replacement method for replacing a predetermined section of a communication cable currently in use with a new communication cable installed in the section, comprising one circuit and two contacts provided in one of the sections. A first switch which is connected to a fixed contact terminal of the switch and connects the fixed contact terminal to one end of one fiber of a fiber comparison quad that performs fiber comparison of the communication cable currently in use. a light emitting diode, a DC power supply and a reverse voltage protection diode connected in series between the first switching contact terminal and the second switching contact terminal of the switching device, and the newly installed communication cable. Connect one end of one core wire of a test line quad set as a test line among the plurality of quads constituting the test line quad to the second switching contact terminal, and connect the core wire of the test line quad in the other section of the section to the second switching contact terminal. and a second connection means connected to the other end of the fiber conductor of the fiber contrast quad, forming a fiber comparison circuit, and setting the switching device to the first switching contact side. , while connecting the first connecting means to the core wire to be compared, searching for the core wire to be compared by the second connecting means, and confirming lighting of the light emitting diode; , after connecting the second connection means, switch the switching device to the second switching contact side, connect the confirmed core wire and the core wire of the test line quad in parallel, and Connect the core wire of a predetermined quad of the newly installed communication cable to a predetermined location of the core wire of the new communication cable, remove the first and second connection means, and connect the core wire of the core fiber comparison quad to a predetermined location. A communication cable replacement method characterized in that the current communication cable is replaced with a newly installed communication cable by sequentially performing a cutting operation on each quad. 2. The core comparison circuit is provided with four systems corresponding to at least two lines in one quad, and the switching device is interlocked with the four systems, and the two lines corresponding to each of the two lines are provided.
2. The communication cable replacement method according to claim 1, wherein the direction of the current flowing through the grid is opposite to the husband and wife directions.