JPS6320067B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time division telephone exchange system,
For more details, it has a built-in processor for line concentration control,
This article relates to a subscriber concentration stage test method in a time-division telephone exchange system that has a plurality of distributed subscriber concentration switch modules and time-division distribution stage switches, and these are interconnected by a time-division highway. be.

One of the important test functions for maintaining a time-division telephone exchange system is an intraoffice connection test using a caller proxy circuit, a callee proxy circuit, or a callee proxy circuit.

Conventionally, in space-division switching systems that adopted a centralized control system, storage programs or processors for concentrating wiring logic were not distributed in each subscriber concentrator stage. It was sufficient to prepare one terminal for each of the exchange units in 1:1 correspondence to the caller proxy circuit, callee proxy circuit, and caller/receiver proxy circuit provided in the centralized monitoring test equipment.

However, recent electronic exchanges, such as time-sharing exchanges, are moving toward distributed control systems.
There is a trend toward providing a concentration control processor for each subscriber concentration stage distributed in a plurality of modules. Intra-office connection tests for such distributed control switching systems require the ability to test not only the connected equipment common to the switching units, but also the line concentrator control processor, which is a resource unique to the subscriber line concentrator module. The conventional circuit system, in which a set of test terminals for connecting to a group of proxy circuits such as a caller proxy circuit, is provided in common for each replacement unit cannot achieve this purpose.

In view of the above-mentioned drawbacks of the prior art, the present invention provides a caller proxy circuit in a central monitoring test device that connects one terminal for testing from a corresponding subscriber concentrator switch module to a caller agent circuit in a centralized monitoring test device, It is an object of the present invention to provide a test method which can be connected to a callee proxy circuit or a caller/caller proxy circuit, and which enables various tests of intra-office connection equipment including a subscriber concentrator stage via the test terminal.

Therefore, the present invention provides a lead-in line for intra-office connection testing for each of a plurality of distributed subscriber concentrator switch modules, and at the same time, provides one set of proxy circuits and a space-divided test concentrator line within the monitoring test equipment. Depending on the type of test and prior to the connection test, the test concentrator switch is closed, and the test terminals connect each of the proxy circuit groups to the test drop-in line of the corresponding subscriber concentrator module. It is characterized by being configured to make a preliminary connection to the caller, receiver, or caller by simply preparing one terminal per subscriber concentrator module for intra-office connection tests. Both can be simulated, making it possible to carry out outgoing tests, incoming tests, etc. economically.

Furthermore, the present invention can also be applied to subscriber line testing, so that one of the subscriber lines accommodated in the subscriber line concentration switch module is selected and a switch is installed to spatially lead in the subscriber line. A line test lead-in circuit consisting of a group is installed in each subscriber concentrator switch module, and the line test lead-in circuit is accommodated in the test concentrator switch provided for the above-mentioned intra-office connection test. By centrally installing multiple track test trunks in the same row, it is possible to connect desired subscriber lines to the track test trunk and test them. This solves the problem of high voltage signal pull-in during line testing due to the fact that it is a switch.

Next, examples of the present invention will be described. The figure shows a specific embodiment of the present invention, and the details of the present invention will be explained with reference to the figure. In the figure,
Reference numeral 1 indicates a plurality of telephones installed in parallel, 2 a subscriber line concentration switch module which is installed separately for each fixed call volume, and 3 a time division distribution stage switch. The subscriber line concentration switch module 2 shows a specific configuration example in the digital line concentration format.
indicates a subscriber circuit provided for telephone set,
Current supply (B), overvoltage protection (O), ringing transmission (R), signal detection (S), codec (C), 2-wire to 4-wire conversion hybrid (H), test lead-in (called "BORSCHT"), It has various functions of T).
Reference numeral 22 denotes a test-only subscriber circuit having the same functions as the subscriber circuit 21, and an intra-office connection test is conducted through this circuit. In addition, the subscriber line concentration switch module 2 includes a line concentration control processor 23 and a multiplexing circuit 24.
is an interconnection operation with a central control unit CPU (not shown) connected via a signal link, and monitors call detection, response detection, etc. in the subscriber circuits 21 and 22, as well as sends out a calling signal, performs test pull-in, etc. The multiplexing circuit 24 is connected to the time division distribution stage switch 3 via the time division highway, and the subscriber circuits 21 and 22 are connected to the time slot number assigned by the concentrator control processor 23.
It performs multiplexing/demultiplexing of PCM signals from/to. On the other hand, numeral 4 is a central monitoring test device, but only functional blocks related to the present invention are shown. In other words, 42, 43, and 44 are a set of caller proxy circuits, a callee proxy circuit, and a caller/receiver proxy circuit provided in each switching unit; 45 is a line test trunk installed in the required number depending on the scale of the station; and 41 is a line test trunk. This is a test concentration switch.

Next, the operation of the circuit configured as shown will be explained. First, the test procedure for the intra-office connection test will be explained. Prior to the test, the maintenance person specifies the subscriber concentrator switch module number and test type to be tested. In the specified subscriber line concentration switch module 2, the line concentration control processor 23 is activated to close the switch C in the test subscriber circuit 22.
Thereby, the test subscriber circuit 22 is drawn into the central monitoring test apparatus 4 via the connection test lead-in line 52. On the other hand, on the central monitoring test equipment 4 side, the drop-in line 52 is connected to the caller proxy circuit 42 for an outgoing test, to the callee proxy circuit 43 for an incoming call test, and for a third test such as a conference trunk test. If it is used as a line, the crossing point of the test concentrator switch 41 is closed so as to connect it to the calling/receiving party proxy circuit 44. After the above test preparations are made, for example, in a calling test, a call is made from the caller proxy circuit 42,
When a status signal such as a dial is sent out, the subscriber circuit 22 receives the signal via the testing line concentrator switch 41 and the connection testing lead-in line 52. From then on,
The line concentration control processor 23 or CPU accepts these connection signals for general call processing, making it possible to test the communication path system centering on the subscriber line concentration switch module 2 and the various control system devices.

In this embodiment, only one connection test drop-in line 52 is provided for each subscriber line concentration switch module 2. This is sufficient when testing outgoing connections to outside the station or incoming connections from outside the station, but when testing connections within your own station, two lines are required to connect to each of the outgoing proxy circuit and the incoming proxy circuit. The connection test lead-in wire 52 is required. In this case, one subscriber concentration switch module 2
switch C in that circuit 21
The caller agency circuit 42 is connected via the corresponding connection test drop-in line 52 and test concentrator switch 41.
Similarly, the subscriber circuit 21 of the other subscriber concentrator switch module 2 is connected via the corresponding connection test drop-in line 52 and test concentrator switch 41 by closing the switch C in that circuit 21. By connecting to the callee proxy circuit 43, an internal connection test is executed.

Next, the subscriber line test will be explained. When the maintenance person specifies the subscriber to be tested, the line concentration control processor 23 is activated in the corresponding subscriber line concentration switch module 2, and the line concentration control processor 23 is activated to
Switch b is opened and switch a is closed, and the subscriber line including telephone 1 is connected to line test lead-in line 51.
Connect to. On the other hand, in the centralized monitoring test equipment 4, the crossing point of the testing concentrator switch 41 is closed, the drop-in line 51 is connected to one of the line test trunks 45, and the line test trunk 45 is used to test the subscriber line thereafter. During the line test, if it is necessary to test the subscriber circuit 21, close the switch C in the subscriber circuit 21, and close the connection test lead-in line 52 and the test concentrator switch 4.
This can be done by pulling in the receiver proxy circuit 42 via 1.

Therefore, for intra-office connection tests, by simply preparing one terminal per subscriber concentrator module, that terminal can be simulated as either the originator, the receiver, or the originator, making it possible to carry out incoming and outgoing tests economically. can be done. Further, it is possible to connect a desired subscriber line to the line test trunk, and the problem of drawing in high voltage signals in line test can be solved.

As is clear from the above-mentioned embodiments, according to the present invention, a drop-in line for intra-office connection test and subscriber line test is provided for each subscriber concentrator module, and these are housed in a space-divided concentrator switch to conduct the test. To obtain an economical and highly flexible subscriber concentration stage test method because it is configured so that it can be connected at any time to various proxy circuits or line test trunks necessary for conducting tests depending on the type. Can be done.

In the above explanation, the subscriber line concentration switch has been explained using a time-division line concentration type embodiment in which the subscriber line concentration switch converts to digital code and then concentrates the line. However, the present invention is not limited to this type, and the subscriber line concentration switch It can also be applied to a subscriber line concentration switch module of a space division line concentration type in which signals from lines are directly concentrated by a space division switch.

[Brief explanation of the drawing]

The figure is a block diagram of a subscriber concentrator stage test system showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Telephone, 2... Subscriber concentrator switch module, 3... Time division distribution stage switch, 4... Central monitoring test equipment, 21... Subscriber circuit, 22...
Test subscriber circuit, 23... Line concentration control processor, 24... Multiplexing circuit, 41... Test line concentration switch, 42... Caller acting circuit, 43... Calling party acting circuit, 44... Calling/receiving party Substitute circuit, 45...
... Track test trunk, 51... Line test lead-in line, 52... Connection test lead-in line.

Claims (1)

[Claims] 1 Each module has a plurality of subscriber circuits and a concentration control processor built-in, and has a plurality of distributed subscriber concentration switch modules and a time-division distribution stage switch, which are interconnected by a time-division highway. In a time-division telephone exchange system, each subscriber line concentration switch module is provided with an intra-office connection test drop-in line and a subscriber line test drop-in line for selectively connecting a plurality of subscriber circuits; caller proxy circuit required for the test,
A centralized system comprising a test circuit group consisting of a callee proxy circuit, a caller/caller proxy circuit, and a line test circuit necessary for subscriber line testing, and a space-divided test concentrator switch connected to the test circuit group. A monitoring test device is provided, and the test concentrator switch of the central monitoring test device and the test drop-in line of the subscriber concentrator switch module are connected, and the test circuit groups are connected to each other according to the intra-office connection test and the subscriber line test. The test concentrator switch is closed so that it is connected to the test lead-in line of the subscriber concentrator module that is connected to the test drop line of the subscriber concentrator module. a drop-in line to the caller proxy circuit of the test circuit group;
In addition, by controlling the closing of the test concentrator switches so as to connect the in-office connection test drop-in lines of other subscriber concentrator switch modules to the callee proxy circuit, the in-office connection equipment including the subscriber concentrator module A subscriber line concentration stage test method characterized by being able to perform tests and subscriber line tests.