KR100288377B1 - Analog trunk tester of electronic switchboard - Google Patents

Abstract

The present invention relates to an analog trunk test apparatus for testing a state of an analog trunk matching with a two-wire line in an electronic switchboard.

It is possible to test forward loop, reverse loop, tip line ground, ring ground, ring voltage, frequency charging signal which could not be tested using the existing analog subscriber test equipment, and voice signal of analog trunk subscriber by DTMF transmission and reception test. Analog trunk tester for testing transmission characteristics by DTMF transmission and dial pulse reception by matching with 2-wire line without matching with PCM line, by changing current polarity of tip and ring terminals, forward loop, reverse loop, tip line ground Call current supply and 2 wire / 4 wire conversion loop hold detection unit for transmitting the status information of the ring ground to the 2-wire line, call signal generator for supplying ring voltage, frequency charging signal generator for generating frequency charging signal And a DTMF generator for generating a DTMF signal, and received from the talk current supply and the 2-wire / 4-wire conversion loop hold detector. An analog / digital converter for converting analog signals to digital signals, a DTMF receiver for receiving a digitally converted signal from the analog / digital converter and detecting a DTMF signal, and reading the analog trunk status It is configured with a processor that controls each of the functional blocks to determine and test.

Description

Analog trunk tester of electronic switchboard

The present invention relates to an analog trunk test apparatus for an electronic switchboard, and more particularly, to an analog trunk test apparatus for testing a state of an analog trunk that matches a two-wire line in an electronic switchboard.

In the conventional electronic switchboard, there is no device for testing an analog trunk subscriber circuit, and therefore, a device for testing a general subscriber rather than a trunk subscriber is used. Thus, to detect the abnormality of trunk subscriber circuit by using the device for testing analog subscriber in all electronic switch, call signal detection, call current test, dial tone reception test, analog / digital conversion test, digital / ana Log conversion test, echo loss test, charging signal transmission test, etc.

1 is a block diagram of a conventional analog subscriber circuit test apparatus.

First, the call signal detector 101 detects a call signal of two lines of a tip and a ring. When the call signal is detected, the call current is detected and a call path is blocked by forming a call path in the 2-wire / 4-wire conversion loop holding unit 102, and the call current is tested by checking the voltage of the 2-wire line, The dial tone signal, which is formed and input, is received through the call current detection and the two-wire and four-wire conversion loop holding unit 102, the analog / digital conversion unit 103, and the tone receiving unit 105, and subjected to the dial tone reception test. In addition, the tone generator 106 generates a sine wave signal of a voice signal band and applies the digital / analog converter 104 to the analog / digital converter 104. When transmitting to the 2-wire line through the loop hold unit 102, the analog subscriber board converts the analog audio signal of the 2-wire line into a 4-wire signal and transmits it as a 4-wire signal through the PCM matching unit. An analog / digital conversion test is performed by comparing the input audio signal with the signal generated by the tone generator 106 in the comparator 107. When the tone generator 106 generates a sine wave signal of a voice band and outputs it to the comparator 107, the comparator 107 converts the signal into PCM data and transmits it. The analog subscriber board converts the signal received by the PCM matching unit into a 2-wire / 4-wire signal. After that, it is sent to the 2-line track through the PCM matching unit of the analog subscriber. At this time, the call current detection and 2-wire / 4-wire conversion loop holding unit 102 receives the converted signal and converts it into a digital signal through the analog / digital conversion unit 103 and is applied to the comparator 107. Therefore, the comparator 107 performs a digital / analog conversion test by comparing the sine wave signal of the voice band generated by the tone generator 106 with the analog / digital converted signal.

In addition, the tone generator 106 generates a sine wave signal of a voice signal band and applies it to the digital / analog converter 104. The tone generator 106 converts the analog / analog signal into a digital signal, and then detects a call current and converts a 2-wire or 4-wire signal. When transmitting to the 2-wire line through the loop hold unit 102, the analog subscriber board converts the analog audio signal of the 2-wire line into a 4-wire signal and transmits it to the test device through the PCM matching unit again. And a signal that is looped back through the two-wire and four-wire conversion loop holding unit 102, is converted into a digital signal through the analog / digital conversion unit 103, and applied to the comparator 107. Accordingly, the comparator 107 compares the sine wave signal of the voice band generated by the tone generator 106 with the analog / digital converted signal and performs an echo loss test.

On the other hand, the communication current is tested by checking the voltage of the 2-wire line, and the frequency charging signal inputted by the formation of the call path is used to detect the call current and the 2-wire and 4-wire conversion loop holding unit 102 and the analog / digital conversion unit 103 and tonnage. Received via bride 105 and tested for frequency charging signal.

Using the conventional apparatus for testing the analog subscriber circuit such as to test the analog trunk subscriber circuit to match the analog subscriber's PCM line, it took a lot of time to test.

Accordingly, an object of the present invention is to provide an analog trunk test apparatus that can shorten the test time by reading and testing the state of a trunk subscriber circuit without matching with the analog subscriber's PCM line.

1 is a block diagram of a conventional analog subscriber circuit test apparatus

2 is a block diagram of an analog trunk subscriber test apparatus according to an embodiment of the present invention.

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

2 is a block diagram of an analog trunk subscriber test apparatus according to an embodiment of the present invention.

The talk current supply unit 202 transmits state information of the forward loop, the reverse loop, the tip line ground, and the ring line ground to the two line line by changing the current polarity of the tip and the ring terminal of the two line line. The call signal generator 201 supplies a ring voltage. The frequency charging signal generator 206 generates a frequency charging signal. The DTMF generator 205 generates a DTMF signal. The analog / digital converter 203 converts the analog signal received from the talk current supply and the 2-wire and 4-wire conversion loop hold detector 202 into a digital signal. The DTMF receiver 204 receives the digitally converted signal from the analog / digital converter 203 and detects a DTMF signal. The processor 200 reads the analog trunk state, determines a test result, and controls each of the above-described functional blocks so that the test can be performed.

The operation of the preferred embodiment of the present invention will be described in detail with reference to FIG. 2 described above.

The analog trunk test apparatus of the present invention performs a forward loop, a reverse loop, a tip line ground, a ring ground, a ring voltage, a function of transmitting a frequency charging signal, a DTMF transmission and reception function, and a dial pulse reception function.

First, the call current detection and 2-wire / 4-line conversion loop hold detector 202 transmits the status information of the forward loop, reverse loop, tip line ground, and ring ground to the 2-wire line by changing the current polarity of the tip and ring terminals of the 2-wire line. do. When the call signal generator 201 supplies the ring voltage and the frequency charge signal generator 206 transmits the frequency charge signal, the processor 200 reads the status information of the analog trunk subscriber board and forward loops, reverse loops, tip line ground, and ring line ground. It may indicate whether ring voltage and frequency charging signal are normally detected. When the DTTM signal is generated by the DTM generator 205 and applied to the call current detection and 2-wire / 4-wire conversion loop hold detector 202, the call current detection and 2-wire / 4 wire conversion loop hold detection unit 202 transmit an analog trunk through the 2-wire line. Transfer to subscriber board. At this time, the processor 200 tests the DTMF transmission function by comparing the transmitted DTMF signal with the DTMF signal received from the analog trunk subscriber board. When the DTMF signal generated from the DTMF generator of the analog trunk subscriber board is input to the tip and the ring terminal, the analog / digital converter 203 is converted into a digital signal through the call current detection and the 2-wire and 4-wire conversion loop hold detector 202. do. The digitally converted DTMF signal is detected by the DTMF receiver 204. At this time, the processor 200 compares the DTMF signal detected by the DTMF receiver 204 with the outgoing DTMF signal of the analog trunk subscriber board and tests that the DTMF signal is correctly received. Here, when the conventional tone generator 106 generates a sinusoidal signal of a voice band and tests it with a voice signal PCM line of a trunk subscriber, the test time takes about 10 seconds or more, but the DTMF transmission and dial tone reception are performed as in the present invention. This can be reduced to less than 5 seconds when testing the transmission characteristics.

In addition, the analog trunk subscriber board receives the dial pulse transmitted repeatedly by holding and releasing the loop through the tip and the ring terminal to check the call current detection and the 2-wire and 4-wire conversion loop hold detector 202 to receive the dial pulse normally. To see if it works.

The switches 207 and 208 which are not described herein are switches for interrupting the loop when the ring signal generator 201 supplies the ring voltage.

As described above, the present invention can test the forward loop, the reverse loop, the tip line ground, the ring ground, the ring voltage, the frequency charging signal, and the dial pulse, which could not be tested using the existing analog subscriber test apparatus, and the DTMF By the transmission and reception test, it is possible to simplify the hardware configuration of the test equipment by not matching with the voice signal PCM line of the analog trunk subscriber, and also to transmit the DTMF transmission and dial tone reception without matching the voice signal PCM line of the trunk subscriber. There is an advantage that can reduce the test time by testing the test.

Claims (1)

In the analog trunk test apparatus of the electronic exchanger, Call current supply and 2-wire / 4-wire conversion loop hold detection unit for changing the current polarity of the tip and ring terminals to transmit the status information of the forward loop, reverse loop, tip line ground, and ring ground to the 2-wire line; A call signal generator for supplying a ring voltage; A frequency charging signal generator for generating a frequency charging signal; A DTMF generator for generating a DTMF signal, An analog / digital converter for converting an analog signal received from the talk current supply and the 2-wire / 4-wire conversion loop hold detector into a digital signal; A DTMF receiver which receives the digitally converted signal from the analog / digital converter and detects a DTMF signal; The analog trunk test apparatus of the electronic switchboard, characterized in that the processor is configured to control the respective functional blocks so as to read the analog trunk state and determine a test result.