JPH0446445A - Channel continuity test system - Google Patents

Abstract

PURPOSE:To eliminate the need for the connection of a tested subscriber circuit to an external test circuit and to simplify the control of an exchange by confirming the continuity of a channel through the loopback of a test signal in a subscriber circuit. CONSTITUTION:When the subscriber circuit continuity test is executed, an exchange processing unit 3 sends a control signal Sc to a subscriber control section 15 to operate a test connection changeover device 14 thereby connecting a test circuit 13 to a 2/4-wire conversion circuit 12. Moreover, the exchange processing unit 3 controls a time division channel 2 to set a channel from a digital test signal transmitter 4 to the subscriber circuit 1 and to a channel from the subscriber circuit 1 to a digital test signal receiver 5. When the receiver 5 receives the test signal looped back normally, the normality of the continuity of the channel is confirmed and when the test signal is not normally received, it is discriminated that a fault exists in the continuity of the channel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a speech line continuity test method for digital subscriber circuits accommodating analog lines of exchanges.

[Conventional technology]

Conventionally, communication path continuity tests for digital subscriber circuits accommodating analog lines have been performed by controlling a test lead-in link and connecting it to an external test circuit.

[Problem to be solved by the invention]

The conventional communication path continuity test method described above requires test lead-in link control to connect the subscriber circuit under test to an external test circuit, and has the disadvantage that the control becomes complicated.

[Means to solve the problem]

The communication path continuity test method of the present invention is a communication path continuity test method for a digital subscriber circuit accommodating an analog line of an exchange, and includes a test means for looping back a received analog voice band signal and input/output between the analog line side and the analog line side. The digital subscriber circuit includes a test connection switching means for switching the connection of the test connection switching means to the test means side, and a control means for receiving a control signal from the exchange processing device and controlling the connection switching of the test connection switching means,
A transmitting means for transmitting a digital test signal and a receiving means for determining reception of the digital test signal are accommodated in a time-division communication path, and the digital signal is transmitted from the transmission means to the digital subscriber circuit under test via the time-division communication path. Sending out a test signal, looping back the analog demodulated test signal by the test connection switching means and the testing means, and receiving the digitally modulated test signal again by the receiving means via the time division communication path. However, the normality of the communication path is determined based on the reception result.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. Subscriber circuit 1 connects to time-sharing communication path 2 via communication line 21,
0 connected to the exchange processing device 3 via the control line 31
The time division communication line 2 also accommodates a digital test signal transmitter 4 and a digital test signal receiver 5, and the subscriber circuit 1, which is controlled by the switching processing device 3, is connected to the communication line 21 and is connected to a digital voice signal receiver 5. a modem 11 that performs mutual conversion between the 2-wire and 4-wire communication paths, a 2-wire/4-wire conversion line 12 that performs mutual conversion between the 2-wire and 4-wire communication paths, and a test circuit that loops back the received analog audio band signal. 13 and the 2-wire side of the 2-wire/4-wire conversion circuit are connected to the subscriber line line 16 and the test circuit 13.
and a subscriber circuit control section 15 connected to the control line 31 and controlling the subscriber circuit 1 according to instructions from the exchange processing device 3.

Next, the operation will be explained.

When not performing a subscriber circuit continuity test, the test connection switch 14 connects the 2-wire/4-wire conversion circuit 12 to the subscriber line 16. The digital audio signal from the time-division communication path 2 is demodulated into an analog signal by the modem 11 and sent to the 2-wire/4-wire conversion circuit 12. The analog audio signal received from the subscriber line 16 is connected to the modem 11 through the 2-wire/4-wire conversion circuit 12, where it is modulated into a digital audio signal and a time-division call is made! 2.

When executing a subscriber circuit continuity test, the exchange processing device 3 sends a control signal SC to the subscriber circuit control unit 15, operates the test connection switch 14, and connects the test circuit 13 to 2-wire/4-wire
Connect to line conversion circuit 12. Furthermore, the switching processing device 3 controls the time-division communication path 2 to establish a communication path from the digital test signal transmitter 4 to the subscriber circuit 1 and a communication path from the subscriber circuit 1 to the digital test signal receiver 5. and set.

Digital test signal SO from digital test signal generator 4
is input to the modem 11 via the time division communication path 2,
The signal is demodulated into an analog signal and sent to the 2-wire/74-wire conversion circuit 12. The analog test signal sent from the 2-wire/4-wire conversion circuit H12 is transferred to the test circuit 13 by the test connection switch 14.
and is sent back to the 2-wire/4-wire conversion circuit 12 again. The analog test signal returned from the test circuit 13 is input to the modem 11, modulated into a digital test signal Sr, and input to the digital test signal receiver 5 via the time division communication path 2. In this digital test signal receiver 5,
If the returned test signal can be received normally, the normality of the communication path is confirmed, and if the test signal cannot be received normally, it can be determined that there is an abnormality in the communication path.

〔Effect of the invention〕

As explained above, the present invention includes a test circuit that returns a received analog audio band signal to a digital subscriber circuit that accommodates an analog line, and a test circuit that tests the 2-wire side of a 2-wire/4-wire conversion circuit from the subscriber line side. Equipped with a test connection switch that switches the connection on the circuit side, and confirms the continuity of the communication path by looping back the test signal within the subscriber circuit, eliminating the need to connect the subscriber circuit under test to an external test circuit. There is no need for test lead-in link control for this purpose, which has the effect of simplifying the control of the exchange.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1...Subscriber circuit, 2...Time division communication path, 3...
Exchange processing device, 4... Digital test signal transmitter, 5.
...Digital test signal receiver, 11...Modulator/demodulator, 1
2... 2-wire/4-wire conversion circuit, 13... Test circuit, 1
4... Test connection switch, 15... Subscriber circuit control section.

Claims (1)

[Claims] In a communication line continuity test method for a digital subscriber circuit that accommodates an analog line of an exchange, a test means for looping back a received analog voice band signal and an input/output section with the analog line side are connected to the test means side. The digital subscriber circuit includes a test connection switching means, a control means for receiving a control signal from an exchange processing device and controlling connection switching of the test connection switching means, and a transmitting means for transmitting a digital test signal; A receiving means for determining reception of the test signal is accommodated in a time-division communication path, and a digital test signal is sent from the transmitting means to the digital subscriber circuit under test via the time-division communication path, and the digital test signal is demodulated into an analog signal. The test signal is looped back by the test connection switching means and the test means, and the digitally modulated test signal is received again by the receiving means via the time-division communication path, and the normality of the communication path is determined based on the reception result. A communication path continuity test method that is characterized by determining gender.