JP3320578B2 - Core wire contrast method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for controlling a cord in telephone work.

2. Description of the Related Art A core wire contrasting operation is a work for confirming whether or not a core wire to be connected is correct when performing line connection work or repair of a public line such as a telephone line. Usually, as a method of performing this operation, a dedicated reference signal transmitter or an automatic response test device (hereinafter referred to as "ATTA") outputs a reference signal having a specific frequency to a desired line to perform a core line comparison operation. In the field, a method is used in which a core control device detects the control signal from the desired line to confirm whether or not the core is correct.
Here, with reference to FIG. 2, a description will be given of a cord contrast operation using ATTA. In FIG. 2, reference numeral 21 denotes a cord contrast device. Reference numeral 23 denotes a control line (paired line), which is a telephone line to perform a core line comparison. 22 is a meeting line (pair line)
Which is a specific telephone line for calling an ATTA or a test stand. The ATTA 26 outputs a control signal to a control line 23 designated by the conventional core control device 21. Here, the reference signal is an AC signal having a specific frequency.

[0002] First, a field worker who performs a core-contrast operation connects a line connection clip and a core-contrast clip provided in a core contrast device 21 to a meeting line 22 and a control line 23, respectively. In this case, the core wire reference clip is connected to each core wire of the control line 23 by a method such as electrostatic coupling. Next, the core wire control device 21 sends out the ATTA calling number to the meeting line 22. This allows
The core control device 21 and the ATTA 26 are connected via the MDF 24 and the exchange 25. Next, the local operator presses the control signal transmission instruction number and then the telephone number of the control line together with the AT from the cord control device 21 using the button dial signal.
Send to TA26. The ATTA 26 transmits a control signal to the control line 23 according to the control signal transmission instruction number and the telephone number of the control line. Here, the control signal is balanced and output to the two core wires of the control line 23. The field worker detects a control signal from the control line 23 using the fiber-contrast clip of the fiber-contrast device 21.

[0003]

In a conventional cord control device, a control signal is received by the method shown in FIG. In this figure, 30 is a differential amplifier, L1 is one core of the control line, and L2 is the other core of the control line. Here, assuming that the line voltage of the control signal is Vs (V), the two cores L1 and L2 of the control line are respectively Vs / 2 (V) and -Vs / 2 (V) with respect to the ground potential. ) Is applied.

In the above-described receiving circuit, if one of the core control clips, which should be connected to each of the two cores of the control line, is erroneously connected to a completely different line, The line control device detects a control signal while having a voltage value of 1/2. Therefore, if only one of the fiber-contrast clips is connected to the core of the control line, the correct fiber is determined even if the other of the cable-contrast clips is connected to the core of an unrelated line. Make a judgment.
The present invention has been made in view of such a point, and when one of the two core wires of the control line is erroneously connected to another line, the error is detected. The purpose of the present invention is to provide a cord contrast method that can be used.

[0005]

According to the first aspect of the present invention,
Call the automatic response test device or test bench installed in the telephone office, and call the automatic response test device or the test bench pair.
Control signal transmitted by using the irradiation signal transmitter, a cord control method for performing a core wire control by informing whether detected from the telephone line to perform the core wire control, the core wire
The control method includes a first amplifying step of amplifying and outputting a detection voltage of a control signal between one of the cores of the telephone line to be subjected to the core comparison and the ground potential; A second amplification step of amplifying and outputting a detection voltage of a reference signal between the other core wire and the ground potential, and outputs of the first and second amplification steps both being equal to or higher than a predetermined level , Around the reference signal
If the wave number matches the transmitted control signal,
Control signal indicating that the transmitted control signal has been detected
And a detecting step . According to a second aspect of the invention, it calls an automatic response test equipment or test stand installed in a telephone station, the automatic response testing device or the trial
Control signal transmitted by using a test stand control signal transmitter,
It is detected whether or not it has been detected from the telephone line to be checked.
Cord control device performs core controls by Selle met
Te, the core wire control device includes a first amplifier that amplifies and outputs a detection voltage of the control signal between one core wire of the telephone line to perform the core control and the ground potential, of the telephone line amplifying the detected voltage of the control signal between the other core wire and the ground potential
And the second and third amplifiers, both of which output are equal to or higher than a predetermined level, and the detected control signal
If the frequency of the signal matches the transmitted control signal
That the transmitted control signal has been detected.
Characterized in that a control signal detection unit.

[0006]

According to the present invention, the two cores of the control line are individually compared with the cores. Therefore, if one of the core control clips that should be connected to the two cores of the control line is erroneously connected to the core of the other line,
The error can be detected.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an electrical connection diagram showing a configuration of a reference signal receiving section provided in a core wire contrast device according to an embodiment of the present invention. In this figure, L1 and L2 are respective cores of a control line composed of two cores. 1 and 2 are amplification factors K
The differential amplifier 1 performs differential amplification between the core L1 and the ground potential, and the differential amplifier 2 performs differential amplification between the core L2 and the ground potential. Reference numeral 3 denotes a switch for selecting and outputting one of the reference signals output from the differential amplifiers 1 and 2 to a reference signal detection unit (not shown) in the optical fiber matching device.

Next, the operation of the above-mentioned reference signal receiving section will be described. First, when a reference signal, which is an AC signal of the voltage Vs (V), is transmitted to the reference line, the reference signal is output in a balanced state, so that the voltage Vs / 2 is applied to each of the cores L1 and L2.
(V) and an AC signal whose voltage values are inverted from each other is applied. That is, at a certain time, the cord L1
And if the line voltage of the core L2 is Vs (V), the voltage of the core L1 with respect to the ground potential is Vs / 2 (V),
The voltage of the core wire L2 with respect to the ground potential is -Vs / 2
(V).

Here, a case is considered in which the fiber-contrast clip of the fiber-contrast device is correctly connected to the control line. At this time, when the control signal of the voltage Vs (V) is transmitted to the control line, the balanced AC signal of the voltage Vs / 2 (V) with respect to the ground potential is transmitted to each of the cores L1 and L2. Therefore, in FIG. 1, both differential amplifiers 1 and 2 have K
-Output an AC signal of Vs / 2 (V). Here, when the switch 3 is turned on to the differential amplifier 1 side, an AC signal output from the differential amplifier 1 is connected to a reference signal detection unit (not shown) at a subsequent stage. The reference signal detection unit determines whether the frequency of the AC signal matches the frequency specific to the reference signal and determines whether the reference signal level is equal to or higher than a certain level. If the reference signal level is equal to or higher than the predetermined level, the local operator is notified that the control signal has been detected. Next, when the switch 3 is turned on to the differential amplifier 2 side, the output of the differential amplifier 2 is connected to the reference signal detection section, and the reference signal is detected in the same manner. Therefore, the cords L1, L2
Since the control signal is detected from both of them, it can be seen that the connection between the core wire control device and the control line is correctly performed.

Next, consider a case in which one end of the core-contrast clip of the core-contrast device is erroneously connected to another line.
For example, it is assumed that one end of the cord contrast clip is correctly connected to the cord L2, and the other end of the cord contrast clip which should be originally connected to the cord L1 is connected to the cord of another line. Here, the input voltage of the non-inverting terminal of the differential amplifier 1 is 0
Therefore, when the switch 3 is turned on to the differential amplifier 1 side, 0 (V) is output to the above-described reference signal detection unit. Therefore, when the switch 3 is turned on to the differential amplifier 1, the control signal is not detected. Then switch 3
Is supplied to the differential amplifier 2 side, the reference signal of the maximum voltage value Vs / 2 (V) output from the differential amplifier 2 is connected to the reference signal detection unit, and the reference signal is detected. As a result, since the control signal is detected only from the core wire L2, it can be seen that one end of the core control clip is connected to the wrong core wire.

If both ends of the fiber-contrast clip are connected to the wrong conductor, no control signal is output from both the differential amplifiers 1 and 2, so that the control signal is not applied to either switch. No signal is detected, and it can be detected that both ends of the core contrast clip are connected to the wrong core.

[0012]

As described above, according to the present invention, since the control signal is detected for each core of the control line which is a pair, when the control signal is not detected from one of the cores, It is possible to detect that one of the fiber-contrast clips, which should be originally connected to the two cores of the control line, is erroneously connected to the core of another line.

[Brief description of the drawings]

FIG. 1 is an electrical connection diagram showing a configuration of a reference signal receiving unit included in a core wire contrast device according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram illustrating a cord contrast operation using ATTA.

FIG. 3 is an electrical connection diagram showing a configuration of a reference signal receiving unit provided in a conventional optical fiber reference device.

[Explanation of symbols]

1, 2,..., Differential amplifier, 3,.
… Core of control line

──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsuyuki Arai, 1440, Musaki, Sakura, Chiba Prefecture Inside Fujikura Sakura Plant (72) Inventor Masamichi Hatanaka 3-24-7 Botan, Koto-ku, Tokyo Suzuki Giken Co., Ltd. (72) Inventor Yuji Fukuda 1-6-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-1-2777041 (JP, A) JP-A-2-220543 (JP, A) JP-A-3-215759 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 3/22-3/36 H04M 1/24

Claims (2)

(57) [Claims] 1. A call automatic response test equipment or test stand installed in a telephone station, a control signal transmitted using the automatic response test device or the test stand control signal transmitter performs the core control Is detected from the phone line
Core control method performs core controls by informing der
Thus , the first method includes amplifying and outputting a detection voltage of a control signal between one core of a telephone line to be subjected to a core comparison and a ground potential; Control signal between the other core of the line and ground potential
Amplifying the detected voltage and outputting the same, and the outputs of the first and second amplifying steps are both equal to or higher than a predetermined level, and the frequency of the detected reference signal is transmitted
The transmitted control signal when the control signal matches
Core control method characterized by having a control signal detection process of notifying the detection of the. 2. A call automatic response test equipment or test stand installed in a telephone station, a control signal transmitted using the automatic response test device or the test stand control signal transmitter performs the core control Is detected from the phone line
Or with core wire control device that performs core controls by the notifying
There are, the core wire control device includes a first amplifier that amplifies and outputs a detection voltage of the control signal between one core wire and the ground potential of the telephone line to perform the core wire control, the telephone line Signal between the other conductor of
And a second amplifier that amplifies and outputs the detection voltage of the first and second amplifiers.
And the frequency of the detected control signal is transmitted
If the control signal matches, the transmitted control signal is
And a reference signal detection unit for notifying that the detection has been performed .