JPH0389757A - Maintenance supervisory system for subscriber line - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a secondary and a tertiary faults, and to improve safety by detecting that commercial AC power supply leaks to a subscriber line, and drawing-in the subscriber line into an automatic subscriber line test device, and disconnecting the line at every subscriber line. CONSTITUTION:A circuit 4 for supervising the leakage of the commercial power supply at a subscriber line 5 side in a telephone exchange and a switching circuit 6 for separating the subscriber line 5 side and the subscriber circuit 1 of the exchange side according to its fault information are provided. Besides, a disconnection switch 7 for insulating entirely this single subscriber line from other subscriber lines, etc., is provided. Then, when the fault that the commercial power supply leaks to the subscriber line 5 takes place, the fault is reported immediately, and simultaneously, the subscriber line 5 is separated from the exchange. Thus, the induction of the secondary fault of the subscriber circuit, etc., can be prevented, and simultaneously, the locating of the fault and the repairing of the fault are executed quickly, and in addition, the safety of a maintenance worker can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a maintenance monitoring system for subscriber lines corresponding to telephone subscribers accommodated in a telephone exchange.

[Conventional technology]

Conventionally, this type of maintenance monitoring method for subscriber lines involves having maintenance test personnel designate a specific subscriber line and automatically testing the subscriber line periodically or at any time, or in response to a complaint from a subscriber. Upon request, subscriber lines were manually tested from a test stand.

[Problem to be solved by the invention]

The conventional subscriber line maintenance monitoring method described above is carried out as specified by maintenance test personnel, so in general telephone exchanges with a large number of subscriber terminals, it is difficult to perform preventive maintenance tests on all subscriber lines. The problem with this method is that it takes a long time because the subscriber's free time slot must be selected.

In addition, since tests from subscriber line test stands are conducted by maintenance personnel based on complaints from subscribers, telephone service for that subscriber is interrupted from the time a line failure occurs until the failure search is carried out. There was a problem that it could not be supplied. Due to these problems, secondary and tertiary failures may occur, such as inducing failures in the subscriber circuit on the converter side, or the maintenance personnel of the subscriber line may touch the subscriber terminal without knowing that there is a commercial power source coming into contact with the customer. There were also serious problems in terms of sexuality.

SUMMARY OF THE INVENTION An object of the present invention is to provide a subscriber line maintenance monitoring system that solves the above problems.

[Means for solving μ problem]

The subscriber line maintenance monitoring system according to the present invention includes an AC contact detection circuit that detects contact of a commercial AC power source with a subscriber line and outputs AC contact information, and a subscriber line and exchange side that terminate telephone subscribers. a test switching circuit that separates the subscriber lines and connects them to an automatic subscriber line testing device; a disconnect switch that disconnects each subscriber line from the subscriber lines that have been drawn in by the test switching circuit; and fault information including the AC interference information. The exchange has a control section that drives the test switching circuit and disconnection switch according to a predetermined program when receiving the test switching circuit and periodically tests the subscriber line.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, a subscriber circuit 1 accommodates and connects a subscriber line 5 terminating a telephone subscriber 2 to a switch network (not shown) of an exchange, and a line monitoring circuit 3. AC contact detection circuit 4. Includes a test switching circuit 6° and a cutoff switch 7. The line monitoring circuit 3 connects the subscriber line 5 and monitors call origination and disconnection. The AC contact detection circuit 4 connects the subscriber's line 5 and detects the contact of the commercial power supply (AC) at a detection level that can be set variably, and also maintains the quality of the call without causing distortion in the dial signal from the subscriber's telephone. conditions that do not interfere with other normal operations. The test switching circuit 6 separates the subscriber line 5 and the exchange side within the subscriber circuit l and switches to the automatic subscriber line testing device 11 as in the conventional case. In the disconnection switch, the test switching circuit 6 is switched to the automatic subscriber line testing device 11, completely insulating the subscriber line 5 that has been connected to the subscriber line 5 from other subscriber circuits. The control unit 8 controls the subscriber circuit 1 and the telephone subscriber 2 of the terminal, and also executes control such as call control and communication route control. That is, the control unit 8 receives and edits the call origination/disconnection information from the line monitoring circuit 3 and the AC contact information from the AC contact detection circuit 4, and stores the received and edited information in the fault information register 9 as fault information. The fault information register 9 is scanned by the control unit 8 for maintenance purposes, and when a fault is reported, the contents of the fault information register 9 are read, and the control unit 8 can know the location of the subscriber circuit where the fault has occurred. . The program of the control section 8 edits the order and sends the order in order to drive the test switching circuit 6 and disconnection switch 7 of the subscriber circuit 1. The program also outputs the contents of the failure report by the control unit 8 as a failure message to a terminal device such as a teletypewriter.

In addition, the automatic subscriber line testing device 11 periodically (starts up, for a certain period of time or for a certain number of times M variable) recognizes continuous failures as important failures and reports them to the failure information register 9. If the fault disappears within the number of times, the time and data of the measurement results will be reported in the same way.

〔Effect of the invention〕

As explained above, the present invention includes a circuit that monitors commercial power source interference on the subscriber line side in a telephone exchange, and a switching circuit that disconnects the subscriber line side and the subscriber circuit on the exchange side based on the fault report. By equipping the subscriber line with a cutoff switch to completely isolate the single subscriber line from other subscriber circuits, etc., if there is a failure due to interference with commercial power on the subscriber line, the failure will be reported immediately and the problem will be resolved. The subscriber line will be isolated from the exchange, preventing the induction of secondary failures in the subscriber circuit, etc., and maintenance tests will be conducted to determine whether the failure is a major failure or a temporary failure based on the failure message and the test results of the automatic subscriber line test. Since personnel can be informed, troubleshooting and troubleshooting can be carried out promptly, the safety of maintenance workers can be protected, and telephone services for subscribers can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the subscriber line maintenance monitoring system of the present invention. 1... Subscriber circuit, 2... Telephone subscriber, 3... Line monitoring circuit, 4... AC cross contact detection circuit, 6... Test switching circuit, 7...
- Cutoff switch, 8... Control section, 9...
- Fault information register, 11...Automatic subscriber line testing device.

Claims (1)

[Claims] An AC contact detection circuit that detects contact with a commercial AC power source on a subscriber line and outputs AC contact information, separates the subscriber line that terminates the telephone subscriber from the exchange side, and connects it to the automatic subscriber line testing equipment. a test switching circuit; a disconnection switch that disconnects each subscriber line connected by the test switching circuit; and the test switching circuit and the disconnection switch when receiving fault information including the AC interference information. A system for monitoring the maintenance of a subscriber line, characterized in that the exchange has a control unit that drives the subscriber line according to a predetermined program and periodically tests the subscriber line.