JPS63220641A - Subscriber circuit - Google Patents

Abstract

PURPOSE:To know an action condition in plural supervising points in detail by sending a signal concerning to an action condition in plural supervising points for testing to an incoming line as a PCM signal by a control signal for testing from an outgoing line, in the test of a subscriber circuit. CONSTITUTION:A subscriber circuit 1' has a circuit part 14 composed of a feeding and supervising circuit 11, a two-wire/four-wire converting circuit 12 and a cordic 13, a multiplexing signal converting means 15 composed of a multiplexing switch 150, an analog/digital converting circuit 151 and a control circuit 152 and a switching means 16 composed of a switching circuit 17. The multiplexing signal converting means 15 receiving a control signal for testing from the outgoing line 20 multiplexes the signal (analog) of respective types of the action condition appearing at plural supervising points for testing of the circuit part 14, digital-converts it, makes it into a PCM signal, sends control signal to the switching means 16, connects the output of the multiplexing signal converting means 15 with the incoming line 21 and sends the PCM signal. The PCM signal is analyzed by a central control unit and respective types of the action condition are displayed.

Description

[Detailed Description of the Invention] [Summary] In testing subscriber circuits, signals (analog) related to the operating status at multiple monitoring points for testing are multiplexed and converted into digital signals using test control signals from the downlink. The PCM signal is sent to the uplink as a PCM signal and analyzed within the exchange to determine the detailed operating status of the subscriber circuit.

[Industrial application field]

The present invention relates to a subscriber circuit of an electronic exchange, and more particularly to a subscriber circuit that reports operating conditions at a plurality of test monitoring points during a test.

To test subscriber circuits, test equipment is connected to each subscriber circuit to determine pass/fail regarding call/receive functions, etc., but in order to identify the details of circuit operation and deal with failures, etc., only pass/fail determination is performed. Instead, it is desired to provide a subscriber circuit that can report the operating status of the monitoring point to be tested.

[Conventional technology]

FIG. 4 is a block diagram of a conventional subscriber circuit.

In the figure, a tester 8 connected to a subscriber circuit 1 is used in conjunction with a test equipment (hereinafter referred to as TST) 7 of a switching system.

Central control unit (hereinafter referred to as CC) according to instructions from TST7
6 gives control information to the signal distribution device (hereinafter referred to as SD) 5, causes the monitoring/signal circuit 1o to send a control signal, and relay T
make it work.

The activated contacts tO, tI connect the tester 8 to the subscriber circuit 1.

The tester 8 tests outgoing operation, dialing, incoming call operation, etc., and these test signals cause state changes (voltage changes) at monitoring points such as response detection and loop monitoring in the power supply/monitoring circuit 11. The state change is transmitted to the scanning device (hereinafter referred to as SCN) 4 by the control/monitoring circuit 10.

5CN4 detects the state change by scanning and sends 1 to CC6.
After lTlfil, CC6 determines whether the detection result is acceptable or not, and prints it out using TST7.

Further, by dialing the tester 8, the CC 6 connects the subscriber circuit 1 to the test trunk 3 via the network 2.

Regarding the audio signal test, the audio signal sent out from the tester 8 at a constant level is passed through the contacts to and tl.

Power supply/monitoring circuit 11, 2#j5f4-wire conversion circuit 12° codec 13. Uplink 21. The audio signal transmission loss is measured in the test trunk 3, and printed out by the TST 7 under the control of the CC 6.

Regarding voice signal transmission loss on the receiving side, a voice signal of a certain level is transmitted from the test trunk 3 to the network 2. Downlink 20. Codec 13. 2-wire to 4-wire conversion circuit 12.
Power supply/monitoring circuit 11. The contacts tfl and tl are sent to the tester 8 and measured.

[Problem that the invention seeks to solve]

The conventional technology described above has a problem in that the test only determines the quality of functions such as response, but cannot identify the state of these functions.

[Means for solving problems]

FIG. 1 is a block diagram of the principle of the present invention.

In the figure, 1' indicates a subscriber circuit of a time division electronic exchange. 14 is a circuit section, 20 is a down line, and 21 is a line.

As related to the present invention, reference numeral 15 multiplexes and digitally converts input signals from a plurality of input terminals connected to a plurality of test monitoring points representing various operating states of the circuit section 14,
A multiplexed signal converter 16 outputs a CM signal, and 16 is a switching device that switches the connection between the uplink 21 and the circuit section 14 to the multiplexed signal converter 15 under the control of the multiplexed signal converter 15. .

[Effect]

The multiplexing signal converting means 15, which has received the test control signal from the downlink 20, multiplexes and digitally converts the signals (analog) of various operating states appearing at the plurality of test monitoring points of the circuit section 14, and converts the signal into a PCM signal. At the same time, the switching means 1
6 to connect the output of the multiplexed signal conversion means 15 to the uplink 21, and send out the PCM signal.

The PCM signal is analyzed by a central control unit (not shown) and the various operating states are displayed.

In this way, since the operating state of each test monitoring point can be identified, troubleshooting, etc. can be performed accurately and quickly.

〔Example〕

The present invention will be specifically explained below with reference to illustrated examples.

FIG. 2 is a block diagram of a subscriber circuit according to an embodiment of the present invention, and FIG. 3 is an explanatory diagram of transfer of various operating states. The same reference numerals indicate the same objects throughout the figures.

In FIG. 2, power supply/monitoring circuit 11.2-wire to 4-wire conversion circuit 12. The codec 13 corresponds to the rotary section 14 in FIG. 1, and the multiplexing switch 150. Analog-digital conversion circuit 151. The control circuit 152 corresponds to the multiplex signal conversion means 15 in FIG. 1, and the switching circuit 17 corresponds to the switching means 16 in FIG.
corresponds to

The connection between the subscriber circuit 1'' and the tester 8 is the same as in the conventional example, but at the same time as the connection, the CC 6 sends the test control information CD to the control circuit 152 via the downlink 20.

As shown in FIG. 3, the test control information CD is sent during the free time between the PCM reception signals RD (for example, voice) sent every 125 μs, so there is no problem with telephone calls.

Monitoring points regarding the power supply voltage, loop detection judgment level, analog signal waveform, etc. are connected to the input terminals Sl, S2 to Sn of the multiplexing switch 150, and the status (for example, voltage) of these monitoring points is determined by the control circuit 152. The signal is multiplexed by a multiplexing switch 150 under the control of , and converted into a PCM signal having a pulse number corresponding to the voltage level of the monitoring point by an analog-to-digital conversion circuit 151 including a delta-sigma modulator.

Since the control circuit 152 switches the switching circuit 17 and connects the output of the analog-to-digital conversion circuit 151 to the uplink 21, the PCM signal is sent to the uplink 21.
It is analyzed by CC6 via network 2, and the operating status of each test monitoring point above is displayed as TST in the original analog quantity display.
It is printed out from 7. This allows the detailed circuit operation of the subscriber circuit 1'' to be identified.

As shown in FIG. 3, the above PCM signals are transmitted in the free time zone between the PCM transmission signals SD sent every 125 μs in the order in which they are time-division multiplexed, that is, the operating state information 11 of the input terminal S1.
Ds1. Since the operating state information D32 of the input terminal S2 to the operating state information DSn of the input terminal Sn are sent in sequence, there is no problem with telephone calls.

The measurement of audio signal transmission loss is performed using the same connection as in the conventional example, but since the waveform of the analog signal can be obtained from the test monitoring point on the analog signal side of the codec 13, more detailed transmission characteristics can be measured. An exam will be held.

〔Effect of the invention〕

As explained above, according to the present invention, the operational status at multiple monitoring points can be known in detail, so it is possible to carry out regular tests to confirm whether various functions of subscriber circuits are functioning normally when constructing a switch. Tests can be performed accurately, and in the event of a failure, the failure can be analyzed and repaired quickly.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram of a subscriber circuit according to an embodiment of the present invention, Fig. 3 is an explanatory diagram of transfer of various operating states, and Fig. 4 is a subscriber circuit diagram of a conventional example. It is a circuit block diagram. In the figure, 1' is a subscriber circuit, 14 is a circuit section, 15 is a multiplexed signal conversion means, 16 is a switching means, 20 is a downlink, and 21 is an uplink. Conventional Erection 1 subscriber circuit 1 Calculation 4 Koguro (branch)

Claims (1)

[Claims] In a subscriber circuit (1') of a time division electronic exchange, input signals of a plurality of input terminals connected to a plurality of test monitoring points representing various operating states of the circuit section (14) are multiplexed. The connection between the uplink (21) and the circuit section (14) is controlled by a multiplex signal converter (15) that converts the signal into a digital signal and outputs it as a PCM signal, and the multiplex signal converter (15). A switching means (16) for switching the connection with the multiplexed signal converting means (15) is provided, and the PCM of the multiplexed signal converting means (15) is operated by a test control signal from the downlink (20). A subscriber circuit characterized in that a signal is sent to an uplink (21) via the switching means (16).