JPS59122064A - Trunk test system - Google Patents

Abstract

PURPOSE:To decrease test control lines in number and to take a secure test by connecting plural devices to be tested and test control lines of a testing device in parallel, and providing test request signals for the devices to be tested. CONSTITUTION:When the test start switch of the trunk to be tested of a device 11 to be tested is closed, the device 11 closes a relay contact SW21 to detect the testing device 10 and the trunk to be tested being in idle state, and sends out a test request signal to the device 10 through a test control line T1. The device 10 detects the test request signal by a detecting circuit 23, a control circuit 26 sends out a switching signal for a speech line to the trunk to be tested through a test control line T2, and the device 11 detects the switching signal to connect the trunk to be tested to the speech line of the device 10. Then, register signals of an incoming trunk side and an outgoing trunk side are tested by a modulating and demodulating circuit 24 and an MFC transmitter and receiver 25 to display whether the tested trunk is normal or not, and the trunk is disconnected from the device 20 to its original state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for testing trunks connected to electronic exchanges and facing automatic telephone terminals.

Conventionally, in this type of trunk test method, multiple devices under test each having an address number, etc., and the test equipment that tests the devices under test are connected via multiple independent test control lines. When testing, the device under test is determined by specifying the address number from the control circuit, and the test is executed by sending a test request signal to the device under test and pulling the trunk under test into the test device. Was. Therefore, as the number of devices under test increases, the number of test control lines also increases, and the number of address lines also increases, making the connection between the devices under test and the test equipment complicated.

Wood brother E! A was created in view of the above drawbacks, and consists of one rank that has both incoming trunk and outgoing trunk functions, a storage circuit, and a circuit that controls these, and two test control lines are connected in parallel. The trunks under test of multiple devices under test are tested, and the first test device is tested on the test equipment K. Detect empty condition,
When a test request signal is sent to the test equipment, the test equipment detects the test request signal, sends a switching signal to the test equipment, pulls the trunk under test into the test equipment, executes the test, and indicates the end of the test. By having means for switching to the call TJ side when detected, that is, by connecting the test control lines in parallel and providing a test request line in the device under test itself, the test request signal can be transferred from the device under test to the test device. The purpose of the present invention is to provide a trunk test method that enables reliable testing by simplifying the connection between the device under test and the test device.

Hereinafter, the present invention will be explained based on actual examples shown in the drawings.

FIG. 1 shows a wiring diagram of an embodiment of the device of the present invention, and FIG. 2 shows a block diagram of a test device and a device under test. In FIG. 1, IO is a test device, and 11 to 1n are devices under test, which are connected in parallel through test control lines 'rl, T2 and communication lines A and B through relay contacts. Furthermore, the test apparatus 10 and the devices under test 11 to 1n of this embodiment have the same configuration as shown in FIG. a trunk having a circuit 23;
Modulation/demodulation circuit 24, MFC transceiver 25, and control circuit 2
6 and a memory circuit 27.

In FIGS. 1 and 2, for example, when a test start switch (not shown) of the trunk under test of the device under test 11 is turned on, the device under test 11 closes the relay contact 5W21,
The state of the test device 10 and the state of the trunk under test are detected. Here, if it is detected that both are empty, the control circuit 26 sends a test request signal to the test apparatus 10 via the test control line T1. On the other hand, when the test device 10 detects a test request signal from the device under test 11 through the detection circuit 23, the control circuit 26 sends a communication line switching signal to the trunk under test via the test control line T2. and send it. The device under test 11 that detected the switching signal connects the relay contacts SWI, 1°SWI 2 , SW31.5 of the trunk under test.
Drives W32 and connects communication lines AOI, BOI, Al
l, Bll, the call IvilAO of the test device 10
O, BOO, AIO, BIOK connection. Test device 10
When the device under test 11 is connected to the test equipment 10, the register signal on the incoming trunk side is used for the modulation/demodulation circuit 24 to perform a test, and the register signal on the outgoing trunk side is used for the MFC transceiver 25 to perform the test. do. When the exam is finished,
It displays the pass/fail status of the trunk under test, disconnects from the test equipment, and restores the original state. In this way, it is possible to test the acceptability of the n devices under test 11 to 1n using the 17n test control lines. At this time, in the trunks under test 12 to In other than the trunk under test 11 whose test start switch is turned on, both the test control line and communication line of the test equipment 10 and other equipment under test that have not requested the test are relay contacts. It has been cut off.

As described above, according to the present invention, test control lines are connected in parallel to a plurality of devices under test and a test device that tests the devices under test, and a test request signal is provided to the device under test. It is possible to significantly reduce the number of wires and test line control circuits, facilitate the connection between the test equipment and the device under test, and eliminate connection errors and ensure reliable testing.

[Brief explanation of the drawing]

FIG. 1 shows a wiring diagram of an embodiment of the device of the present invention, and FIG. 2 shows a block diagram of a test device and a device under test. Aoo=Aon - Call line Boo-Bon - Call line A1o~Ain... Call line Blo-Bin
...Telephone line TI, T2...Test control line 10.
...Test devices 11 to 1n...Device under test 2]...
・Incoming trunk (circuit) 22...Outgoing trunk (circuit) 2
3...Detection circuit 24...Modulation and demodulation circuit 25
...MFC transceiver 26...control circuit 2
7...Memory circuit SWI 1~SWI 2n...Relay contact 5W20~SW2 n -...Relay contact SW
31~SW32n...Relay contact applicant NEC Corporation

Claims (1)

[Claims] It consists of a trunk that has both incoming trunk and outgoing trunk functions, a storage circuit, and a circuit that controls these, and tests multiple devices under test with two test control lines connected in parallel, and the device under test. In the test equipment, in response to the test start signal of the trunk under test, a control circuit detects the trunk of the equipment under test and the empty state of the test equipment, sends a test request signal to the test equipment, and sends the test request signal to the test equipment. Means for sending a switching signal to the device under test (by the detected test device), pulling the trunk under test of the device under test into the test device, causing the test to be executed, and switching to the communication line side after detecting the end of the test. A trunk test method characterized by having the following.