KR0133671Y1 - Test equipment of telephone communication line - Google Patents

Abstract

The present invention relates to a test apparatus for a telecommunication line for testing a telecommunication line without field personnel, and is similar to a test ring installed at one end of the telecommunication line (L1, L2) to which each subscriber's telephone (TEL) is connected. A waveform detection circuit 101 for detecting a waveform of a signal, a constant voltage circuit 102 for converting an output of the waveform detection circuit 101 into a DC voltage of a constant voltage to use a driving power source of each circuit, and telephone communication A tone circuit 103 that provides a signal for checking for abnormalities of preferences L1 and L2, a sequence circuit 104 for controlling the output of the test signal in a predetermined order, and a telephone communication line during the test period. And a telephone line switching circuit 106 for disconnecting the telephone from the telephone communication lines L1 and L2 during the test period. I am in trouble Whether to the group or by at least by at least the line can be easily understood without on-site personnel.

Description

Test device of telephone communication line

1 is a circuit diagram showing an embodiment of the present invention.

2A and 2B show a ring signal and a similar ring signal for testing.

* Explanation of symbols for main parts of the drawings

101: waveform detection circuit 102: constant voltage circuit

103: tone circuit 104: sequence circuit,

105: loop circuit 106: telephone line switching circuit

The present invention relates to a test apparatus for a telecommunication line, and more particularly, to a test apparatus for a telecommunication line that checks the disconnection and the line status of the telecommunication line using a similar ring signal of a telephone in a telephone station without field verification. It is about.

In general, when the subscriber's phone does not work normally, such as when the subscriber's phone does not work, it is necessary to go to the site where the corresponding subscriber's phone is installed to check whether it is caused by a line break or a failure of the phone itself. Therefore, there is a problem in that it can not provide a quality service because it takes a lot of time and manpower.

Therefore, an object of the present invention is to provide a test apparatus for a telephone communication line that can easily check the telephone line in the telephone station without going to the scene when the telephone is not communicating.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram of an embodiment of the present invention, in which the waveform detection circuit 101 for detecting a ring signal is connected to one end of telephone communication lines L1 and L2 to which each subscriber's telephone TEL is connected. On the output side of the waveform detection circuit 101, a constant voltage circuit 102 for converting the output of the waveform detection circuit 101 into a DC voltage to be used as a driving power source for each circuit is connected.

In the waveform detection circuit 101, as shown in FIG. 2A, when a normal ring signal is input, a predetermined voltage is not charged to the charge / discharge circuits R23 and C7, but the duty ratio is larger than that of the normal ring signal. Since a predetermined DC voltage is charged to the charge / discharge circuits R23 and C7 through the photocoupler PH1 when a signal having a waveform (see FIG. 2B) is inputted, the SCR (SCR1) through the zener diode ZD1. Is triggered so that the capacitor C11 of the constant voltage circuit 102 is charged to a DC voltage. The DC voltage is connected to output a stable constant DC voltage, for example, a + 5V DC voltage, through the IC IC5 to be used as a driving power source for each circuit. The tone circuit 103 is connected to the other end of the telephone communication lines L1 and L2 via a transformer TR, and the tone circuit 103 is in phase with the reverse phase amplifiers IC1, R5 to R6. A balance modulator with amplifiers IC2 and R9, an analog switch AS1 and AS2 for selecting an output of the balance modulator, and a sideband filter SF for passing only one side wave of the modulation signal of the balance modulator. A modulation circuit 103-1, an oscillation division circuit 103-3 for oscillating and dividing at a predetermined frequency, and an amplifier circuit 103-2 for selecting and amplifying the outputs of the modulation circuit and the oscillation division circuit. Doing. Each circuit operates only when the above-described constant voltage circuit 102 outputs a predetermined DC driving power when a predetermined ring signal is input, as will be described later. In addition, the oscillation frequency division circuit 103-3 of the tone circuit 103 is provided with a sequence circuit 104 for operating the analog switches AS3-AS4 by switching the signals according to a predetermined sequence by counting the oscillation signal frequency. It is.

The sequence circuit 104 is provided with a first counter CON1 and a second counter CON2, and the waveform detection circuit 101 of the ring signal is operated to output a predetermined DC driving power (+ 5V). The first counter CON1 is configured to enable the NAND gate NAND4 through the time constant circuits R25 and C8 and an output detected through the resistor R26 and the NAND gate NAND2 through the NAND gate NAND3. By determining whether or not a test signal is input, the analog switches AS1 and AS2 are selected and operated, and the second counter CON2 selects the analog switches AS3 and AS4 at predetermined time intervals. Generate the output to activate. The loop circuit 105 and the subscriber telephone line switching circuit 106 are connected between the sequence circuit 104 and the subscriber telephone communication lines L1 and L2.

The loop circuit 105 is for connecting and connecting the above-described circuits to the subscriber lines L1 and L2 so that when a test signal, which is a similar ring signal, is input, a check of an abnormality of the telephone line can be performed. When the monostable circuit M · M1 and the monostable circuit M · M2 for operation for a predetermined time are provided, and a predetermined signal is output from the monostable circuit M · M2, this signal is output to the photocoupler. The transistors Q5-Q7 are electrically connected through the PH3 to directly loop to the subscriber telephone communication lines L1 and L2 through the bridge diode circuit BR3 and the choke CH1 which are nonpolar connection circuits. The subscriber's telephone line switching circuit 106 is composed of a photocoupler PH2, a resistor R32, a transistor Q2-Q4, and a bridge diode circuit BR2 for nonpolar line connection. When the photocoupler PH2 is not conducting, i.e., at the time of normal measurement, not at the time of measuring the abnormality of the subscriber telephone communication lines L1 and L2, the subscriber telephone TEL is connected to the communication lines L1 and L2. The circuit is connected to the circuit and the subscriber telephone TEL is disconnected from the subscriber communication lines L1 and L2 when the presence or absence of abnormality of the subscriber telephone communication lines L1 and L2 is measured.

Hereinafter, the operation of the present invention configured in this way will be described in detail.

First, when the normal ring signal shown in FIG. 2A is input through the subscriber communication lines L1 and L2, the resistor R23 is passed through the bridge diode BR1 and the photocoupler PH1 of the waveform detection circuit 101. And a charge / discharge circuit formed of a capacitor C7. At this time, when the normal ring signal is input as shown in FIG. 2A, the average voltage charged in the charge / discharge circuits R23 and C7 is equal to or less than the reverse voltage of the zener diode ZD1. Therefore, the predetermined DC voltage is not output from the constant voltage circuit 102. This prevents the photocoupler PH2 of the telephone line switching circuit 106 from conducting, so that the transistors Q2-Q4 are conducted so that the C and D points are electrically shorted, and the telephone TEL is a communication line. It is connected to (L1, L2), and normal telephone communication is possible.

However, as shown in FIG. 2B, a similar ring signal such as a line test, which is a signal having a waveform having a larger duty ratio than the normal ring signal (FIG. 2A), is sent from the telephone station test panel to connect the communication lines L1 and L2. When the signal is input through the signal, the signal is input to the charge / discharge circuits R23 and C7 through the bridge diode BR1 and the photocoupler PH1, and the average voltage charged to the capacitor C7 is the zener diode ZD1. The reverse voltage is higher than. Therefore, since the SCR (SCR1) is triggered, the capacitor C11 is charged with a predetermined voltage, and the charging voltage becomes a constant DC voltage (for example, DC + 5V) through the constant voltage circuit 102. It is used as DC driving power for each circuit. In addition, the sequence circuit 104 detects the driving state of the photocoupler PH1 through the resistors R25 and R26 and the capacitor C8 when the photocoupler PH1 is operated, thereby detecting two NAND gates NAND2, The NAND gate NAND4 is enabled through NAND3 to counter the oscillation frequency of the oscillation frequency divider 103-3 to the first counter CON1 and the second counter CON2 to output a predetermined signal. . That is, the counter CON2 first activates the monostable circuit M · M1 for triggering the loop circuit 105 through the AND gate AND3, and then outputs the output of the monostable circuit M · M1. When the monostable circuit M · M2 for continuous operation is triggered and outputs a predetermined output for a predetermined time, the two photocouplers PH2 and PH3 are operated at the same time. Accordingly, since the transistors Q5-Q7 are turned on to form a loop of the bridge diode circuit BR3, the subscriber telephone communication lines L1 and L2 are DC short-circuited (loop) at the points A and B through the choke CH1. In this state, the transistors Q2-Q4 of the telephone line switching circuit 105 are turned off so that the telephone lines TEL connected to the subscriber communication lines L1 and L2 are in an open state, and the communication line is opened. The telephone TEL is disconnected from L1 and L2.

When the loop circuit 105 is short-circuited directly (loop), the normal communication line tester installed in the MDF test panel of the telephone station checks that the test apparatus is in operation and confirms that the communication line is being tested. According to the test, the track is abnormal. That is, when a predetermined test signal is sent from the normal communication line tester through the telephone communication lines L1 and L2, it is received by the tone circuit 103 and modulated by the modulation circuit 103-1. Only the signal is filtered and the signal of the oscillation frequency divider 103-3 is controlled at a predetermined time according to the control of the sequence circuit 104, and at another predetermined time, only the filtered one side wave of the modulated tone signal is switched to the analog switches AS3 and AS4. Through the communication line (L1, L2) and sent out to the amplifier 103-2 through the communication line (L1, LDF) is sent back to the tester installed in the test panel. At this time, the tester of the MDF test panel can not only check the disconnection of the communication line by receiving the signal, but also determine the good state of the communication lines L1 and L2 by receiving the aforementioned one side wave and checking its signal level. Will be. On the other hand, when a predetermined time after the test is completed, the output of the monostable circuit M · M2 of the loop circuit 105 does not come out and the photocoupler PH2 does not operate, so that the transistor of the telephone line switching circuit 106 ( Q2-Q4) is operated so that the telephone TEL is electrically connected to the subscriber communication lines L1 and L2 through points C and D, and the call is available.

The embodiment described as above is for the most preferred case. However, when only the disconnection of the line is to be measured, the tone circuit 103 may include only the oscillation divider circuit 103-3.

According to the present invention as described above, when the telephone line breaks down, the telephone system fails to reach the site where the telephone is installed, or by simply sending a predetermined similar ring signal for the test in the telephone station without a field agent. It is possible to easily determine whether it is due to a problem or an abnormality of the telephone, and if necessary, it sends out a tone signal through the subscriber communication lines L1 and L2, receives its modulated signals, and adjusts their signal levels. By checking, the good condition of the track can be inspected. In addition, it is possible to perform the loop test and tone test of the line without field personnel without affecting the general call, and the circuit configuration is simple, so it is inexpensive and does not require a separate DC driving power supply.

Claims (3)

A test apparatus for a telephone communication line, comprising: a waveform detection circuit 101 provided at one end of telephone communication lines L1 and L2 to which subscriber telephones TEL are connected to detect a waveform of a test-like ring signal for testing; A constant voltage circuit 102 connected to the output side of the waveform detection circuit 101 to convert the output of the waveform detection circuit 101 into a predetermined DC voltage used as a driving power source for each circuit, and the telephone communication preference ( A tone circuit 103 connected to the other end of L1 and L2 via a transformer TR to provide a signal for checking for abnormality; and a tone circuit 103 connected to the tone circuit 103 in a predetermined order; A sequence circuit 104 for controlling the modulation and processing of a tone signal, and between the sequence circuit 104 and the telephone communication lines L1 and L2 to establish the telephone communication lines L1 and L2 during a test period. Loop circuit 105 for looping DC and phase And a telephone line switching circuit 106 provided between the sequence circuit 104 and the telephone communication lines L1 and L2 to separate the telephone from the telephone communication lines L1 and L2 during the test period. Testing apparatus for telephone communication lines. 2. A test apparatus for a telephone communication line according to claim 1, wherein said tone circuit (103) has only an oscillation frequency divider circuit (103-3). 2. The tone circuit 103 according to claim 1, wherein the tone circuit 103 generates and divides a predetermined signal with a modulation circuit 103-1 for modulating a tone signal transmitted through telephone communication lines L1 and L2 from a telephone station. And an oscillation frequency divider circuit (103-3) and an amplifier circuit (103-3) for amplifying and outputting the signals when the signals are selected and sent in a predetermined order.