JPS6256061A - Channel continuity test method in inter-station common line signal system - Google Patents

Abstract

PURPOSE:To decrease connection delay by providing a talking trunk whose channel is formed as a loopback at the idle state to an incoming station to conduct the continuity test without the use of a loopback exclusive trunk thereby reducing the continuity test time. CONSTITUTION:An outgoing exchange control section 1 selects and acquires an idle talking trunk 2 and sends an address signal from a common line signal device 3 to an opposed station and a continuity test trunk 10 is connected to the talking trunk 2 by a switch 8. The continuity test trunk 10 uses the loopback of the talking trunk 7 whose channel is in loopback when the incoming is idle to start the continuity test immediately and when the result is good, the end of the continuity test is informed to the control section 1. The control section 1 uses the switch 8 to open the continuity test trunk 10 to connect a talking path and a good continuity signal COT is sent to an opposite station from the common line signal device 3. In receiving the COT signal at the incoming side, the control section 5 gives a loopback release command to the talking trunk 7 to connect the talking path to the switch 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication line continuity test method in an interoffice common line signaling system.

[Conventional technology]

The communication line continuity test method in the conventional common line signaling system is as follows:
First, an address signal (hereinafter referred to as IAM) containing call line information to be used from a calling station via a common line signal channel.
is sent to the player, and at the same time, a continuity test trunk (CC
(denoted as T) and the call trunk. Next, the receiving station that has received the IAM connects a return trunk (hereinafter referred to as LPT) to the call trunk to be used and loops back the continuity test signal sent from the OCT of the originating station. The normality of the communication path between the two stations was confirmed by detecting the signal from 0CTIC.

[Problem that the invention seeks to solve]

In the conventional continuity test method described above, the processing time from when the receiving station receives the IAM sent from the originating station to connecting the LPT to the call trunk is not returned even though the originating station is sending out the continuity test signal. However, since the test must be waited for, the test time is long and the connection delay is large. Furthermore, it was necessary to prepare an LPT separately from the call trunk.

[Failure to solve the problem]

According to the present invention, in an automatic switching system using a common line signaling system between stations, the terminating station is equipped with a call trunk in which the communication path is looped back when the terminating station is idle, and the continuity test signal sent from the originating station is transmitted from the terminating station to the terminating station. A communication path continuity test method is obtained, which is characterized in that the communication path is tested between stations by repeating the communication.

〔Example〕

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

FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, 1 is the calling side support equipment control unit (C8P), 5 is the called side exchange control unit (C8P), and 2 and 7 are the call trunks (TRK).
, 3 and 6 are common line signaling devices (CSC), 4 is a common line signaling link, and 8 and 9 are switches (SW).

To make a call, the calling side exchange control section 1 first selects and captures the idle call trunk 2, and sends an address signal (IAM) to the opposing station via the common line signal link 4 from the common line signaling device 3, and also sends an address signal (IAM) to the other station via the common line signal link 4. 10 is connected to the call trunk 2 by a switch 8.

When the continuity test trunk 10 is empty on the terminating side, the continuity test is immediately started using the turn-back [2] of the call trunk 7 whose call path is turned back, and if the result is good, the control unit 1 is Notify test completion.

From this K, the control unit 1 opens the continuity test trunk 10 by using the switch 8, connects the communication bus, and transmits the good continuity signal COT from the common line signal device 3 to the opponent station via the common line signal link 4.

On the receiving side, common line signal bag ff, 6 K to C
Upon receiving the OT signal, the control unit 5 issues a call back cancellation instruction to the call trunk 7 and connects the call path to the switch 9. At the time of recovery, the control unit 5 issues a general call back instruction to the call trunk 7 [2, and if the line is empty, the normal pressure call line is set to the call back state.

This embodiment describes the case where a trunk for outgoing calls and a trunk for incoming calls are used, but even if a bidirectional trunk is used, the same method can be implemented by canceling the callback when making a call and setting the callback when the call is restored. can do.

It is also possible to perform a continuity test before making a call, select only the lines with good results, and use them.Also, it is also possible to test the transmission characteristics.

〔Effect of the invention〕

As explained above, the present invention uses a call trunk with a return circuit to perform a continuity test without using a dedicated trunk for return, shortens the time to complete a continuity test, and reduces connection delay. It has the effect of

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Calling side automatic exchange control unit, 2... Mark - Calling side call trunk, 3... Calling side common line control device, 4... Common line signal link, 5...
Called side automatic exchange control unit, 6... Called side common line signaling device, 7... Called side call trunk, 8...
... Calling side call switch, 9... Calling side call switch, 10... Continuity test trunk. Agent: Susumu Uchihara, patent attorney 6. .

Claims (1)

[Claims] An automatic switching system that uses a common line signaling system between stations is equipped with a call trunk in which the call path is looped back when the terminating station is idle, and the continuity test signal sent from the originating station is looped back from the terminating station. 1. A communication path continuity test method characterized by carrying out a communication path test.