JPS6351427B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trunk test method for performing an intra-station loopback test of a trunk in an exchange.

Generally, in a switchboard, there is an incoming trunk (ICT) on the incoming side and an outgoing trunk (OGT) on the outgoing side.
It is connected to the opposite station via these. Therefore, if it becomes necessary to test the trunk due to a failure or the like, the test must be performed with the involvement of the opposite station. However, it is inconvenient to request the involvement of the opposite station every time a trunk test is performed, and it is also inconvenient to call back within the local station and perform the test in order to determine whether the problem is within the local station. is desirable.

FIG. 1 is a block diagram showing a first example of a conventional trunk loopback test method. In the figure, NW is the network, ICT is the incoming trunk,
TSTOGT-1 and TSTOGT-2 are test output trunks, LTD is a subscriber line test stand, ATT is an automatic response trunk, OSC is an oscillator, TS is a test jack, and S ₁ and S ₂ are switches.

In Figure 1, when the test is not being conducted, the test jack panel TS is closed and the trunk is closed.
ICT is connected to the opposite station. Now entering the trunk
When performing an ICT test, insert the test plug into the test jack TS to isolate the opposing station, and at the same time operate switches S ₁ and S ₂ to select the test output that meets the purpose of the test. A return path is formed by selecting a trunk and connecting the incoming trunk ICT via the test outgoing trunk to the subscriber test stand LTD via the network NW. In FIG. 1, double lines indicate the folding paths thus formed.

When a maintenance person sends a pseudo call from the subscriber line test stand LTD, the network NW and test outgoing trunk
The call arrives at the automatic response trunk ATT via TSTOGT-1, the test jack TS, the incoming trunk ICT, and the network NW. The auto-answering trunk ATT detects an incoming call and activates the oscillator OSC to generate a specific tone, which is sent to the subscriber line test stand LTD via the reverse path of the incoming call. This allows maintenance personnel to know whether there is a failure in the incoming trunk ICT.

FIG. 2 is a block diagram illustrating a second example of a conventional trunk loopback test method, which is capable of testing both incoming trunks and outgoing trunks. In this figure, the same parts as in Figure 1 are indicated by the same symbols, and TSTICT
is the test input trunk, TSTOGT is the test output trunk, and S ₃ , S ₄ , S ₅ , and S ₆ are switches.

In FIG. 2, when a test is not being performed, switches S ₃ and S ₄ are both pushed to the contact 1 side, and the outgoing trunk OGT and incoming trunk ICT are each connected to the opposite station. Now out the trunk
When attempting to test OGT, switch
Flip S ₃ to contact 2 side and connect switch S ₅ . This allows the trunk to be output from the subscriber line test stand LTD.
A return path is formed via the OGT and the test incoming trunk TSTICT to the auto-response trunk ATT, thereby making it possible to test the outgoing trunk OGT.

Similarly, when attempting to test the incoming trunk ICT, turn switch S ₄ to contact 2 and switch S ₆ to contact. As a result, a return path is formed that connects the subscriber line test stand LTD to the test outgoing trunk TSTOGT, the incoming trunk ICT, and the automatic response trunk ATT, thereby making it possible to test the incoming trunk ICT. can.

In this way, in the conventional trunk loopback test method, in order to connect the test trunk to the trunk under test, a maintenance person inserts a test plug into the test jack panel or inserts a test plug into the trunk circuit under test. The maintenance personnel have to operate the switches provided, so the maintenance person has to operate two switches, such as the test stand and the test jack panel, or the test stand and the trunk circuit.
I needed to perform some operations. However, in general, test jacks or trunk circuits cannot always be installed near the test stand, making testing time-consuming and inefficient.

The present invention aims to eliminate these drawbacks of the prior art, and its purpose is to provide a trunk testing method with improved operability. That is, according to the trunk test method of the present invention, it is possible to realize a trunk loopback test method in which the maintenance person can perform the test without leaving the test stand, and also to automatically start the test at a pre-specified time and perform the test. It is also possible to realize an automatic trunk loopback test system that performs the following. However, in order to achieve this objective, in the trunk test method of the present invention, an intra-office return loop is formed between the test line and the automatic response trunk or between different test lines via the test trunk. In the trunk internal loop test method, which tests the trunk by using test trunk selection means for connecting drop-in lines from the outgoing trunks to corresponding test outgoing or incoming trunks;
The present invention is characterized in that by controlling the pull-in relay and the test trunk selection means, a return loop within the own station is formed and a trunk test is performed.

Examples will be described below.

FIG. 3 is a block diagram showing the structure of an embodiment of the trunk test method of the present invention. In the same figure,
Identical parts in FIG. 2 are denoted by the same reference numerals, r1-1 and r1-2 are switching contacts of the first retracting relay (not shown), r2-1 and r2-
2 is a switching contact of a second pull-in relay (not shown), SEL is a selector switch, TTS is a test trunk selection circuit, MB is a busy signal generation circuit, r
3 is a make contact of a busy signal sending relay (not shown).

In Fig. 3, when a test is not performed, the switching contacts r1-1, r1-2, r2-1, r2-2 are connected to the contact 1 side, and the outgoing trunk OGT,
Each incoming trunk ICT is connected to the opposite station. Further, contact r3 is open. Now out the trunk
When attempting to test the OGT, operate the first pull-in relay and connect the switching contacts r1-1, r1.
-2 to the contact 2 side and operate the selector switch SEL and test trunk selection circuit TTS. This will cause the selector switch SEL to
connects the outgoing trunk OGT and the opposite station to the test trunk selection circuit TTS. The test trunk selection circuit TTS connects the drop-in line from the outgoing trunk OGT connected via the selector switch SEL to the incoming testing trunk TSTICT.

As a result, the subscriber line test stand LTD is connected to the automatic response trunk ATT via the outgoing trunk OGT and the testing incoming trunk TSTICT, forming a return path, and is now ready to test the outgoing trunk OGT. Become.

Similarly, when attempting to test the incoming trunk ICT, operate the second lead-in out relay to switch switching points r2-1 and r2-2 to the contact 2 side, and selector switch SEL and test Operate trunk selection circuit TTS. This allows the line from the incoming trunk ICT connected via the selector switch SEL to become the test outgoing trunk.
At the same time as being connected to TSTOGT, the busy signal sending relay is operated and the busy signal generating circuit MB is connected to the opposite station.

Therefore, a return path is formed that connects the subscriber line test stand LTD to the test outgoing trunk TSTOGT, the incoming trunk ICT, and the automatic response trunk ATT, and the incoming trunk ICT becomes ready for testing. , a busy signal is sent from the busy signal generation circuit MB to the opposite station to inform it that the test is under way.

In the trunk test method shown in Figure 3,
Each lead-in relay, selector switch, and test trunk selection circuit can be controlled by operating them on the subscriber line test stand, so that the subscriber line test stand, outgoing trunk, incoming trunk, etc. Even if they are located remotely, maintenance personnel can test these trunks without leaving the subscriber line test stand, greatly improving operability.

FIG. 4 is a block diagram showing the structure of an embodiment of the trunk test method of the present invention. In the same figure, the third
Identical parts in the figure are designated by the same reference numerals, and ATCT is an automatic trunk circuit tester.

In Figure 4, automatic trunk circuit testing equipment
The ATCT has the function of controlling each part according to the trunk internal return test program for controlling each pull-in relay, selector switch, and test trunk selection circuit in the trunk test method shown in FIG. The system is configured so that a test can be automatically performed on a predetermined trunk at a scheduled time.

Therefore, according to the trunk test method shown in FIG. 4, a trunk functional test similar to that in the trunk test method shown in FIG. 3 can be automatically prespecified without requiring any operation by a maintenance person. This can be done at the specified time, further reducing the burden on the maintenance personnel.

As explained above, according to the trunk test method of the present invention, maintenance personnel can perform the test without leaving the test stand, or the test can be performed automatically at a pre-specified time. However, the burden on maintainers is greatly reduced. In this example, we have explained the case where the test call arrives on the automatic answering trunk ATT, but when the test call arrives on other test lines, a call detection and response function is provided on the receiving side to similarly form a return loop within the own station. It is clear that it can be done.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing an example of a conventional trunk loopback test method, respectively, and FIGS. 3 and 4 are block diagrams showing the configuration of an embodiment of the trunk test method of the present invention, respectively. be. NW...Network, ICT...Incoming trunk,
OGT...Outgoing trunk, TSTICT...Incoming trunk for testing, TSTOGT, TSTOGT-1, TSTOGT-2
...exit trunk for testing, LTD...subscriber line test stand,
ATT…Automatic response trunk, OSC…Oscillator, TS…
Test jack panel, S ₁ , S ₂ , S ₃ , S ₄ , S ₅ , S ₆ ... switch, SEL ... selector switch, TTS ... trunk selection circuit for test, MB ... busy signal generation circuit, r1-1, r1 -2, r2-1, r2-2...
Switching contact, r3...make contact.

Claims (1)

[Claims] 1 Trunk intra-station loopback test in which a trunk test is performed by forming an intra-station loop between a test line and an automatic response trunk via a test trunk or between different test lines. In this method, there is a lead-in relay that switches the incoming trunk or outgoing trunk to the opposite station and the local loop side, respectively, and a lead-in line from the incoming trunk or outgoing trunk switched by the lead-in relay to the corresponding test output. or a test trunk selection means connected to the incoming trunk, and by controlling the lead-in relay and the test trunk selection means, a return loop within the own station is formed to perform a trunk test. Trunk test method. 2. The trunk test method according to claim 1, wherein the pull-in relay and the test trunk selection means are controlled by operations from a test stand. 3. The trunk test method according to claim 1, wherein the control of the pull-in relay and the test trunk selection means is automatically performed at a predetermined time by a test program.