JPH04120848A - Maintenance monitoring method for subscriber lines - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to automatic switching equipment, and particularly to a subscriber line monitoring system.

[Conventional technology]

Conventionally, the technology in this field was the D70 type automatic switching machine [
Reference ■] Driving operation method (],) PL33 There was something described in Nippon Telegraph and Telephone Public Corporation, issued on February 10, 1988.

Monitoring tests in the maintenance monitoring system for subscriber lines include automatic subscriber line tests periodically or at any time by designating specific subscriber lines by maintenance test personnel, or subscriber line tests based on complaints from subscribers. This was done using a subscriber line tester that confirmed the normality of the subscriber line and terminal through manual operation by the rack and terminal tester.

[Problem to be solved by the invention]

Automatic subscriber line testing in conventional fault detection methods is performed line by line sequentially on subscriber lines specified by maintenance test personnel using commands. In order to perform a preventive maintenance test on all subscriber lines, it is necessary to select a subscriber's free time slot, which poses a problem in that it takes a long time.

In addition, when testing subscriber line test racks and subscriber line test equipment, maintenance personnel test subscribers when a fault is reported by the subscriber and when the subscriber is circulating, so it is necessary to investigate the fault after it occurs. Until then, there was a problem in that telephone services could not be provided to subscribers.

When a fault occurs in a subscriber line in this manner, it takes a very long time for maintenance personnel to recognize the fault, and the cause of the fault may affect the subscriber circuit. Furthermore, there is a drawback that preventive maintenance cannot be performed for subscribers.

[R-stage to solve the problem]

In order to achieve the above object, the present invention provides a telephone exchange ('
This circuit monitors the insulation and capacitance characteristics of the subscriber line and the failure information obtained by this circuit is sent to the central processing unit and recognized by software.

Further, when the subscriber circuit is in use, a cutoff switch is provided to disconnect the subscriber circuit and the subscriber line monitoring test circuit.

Furthermore, in the event of a failure, each subscriber circuit is provided with a subscriber line disconnect switch in order to avoid the influence of the failure factor on the subscriber circuit l\.

[Effect]

A subscriber line monitoring test circuit is provided for each subscriber circuit to constantly monitor and detect line failures in the subscriber line. The detected information is notified to the central processing unit and recognized by software.

Thereby, the software transmits a control signal to the subscriber circuit to control the subscriber line disconnection switch provided in each subscriber circuit, thereby disconnecting the subscriber line.

Further, if a subscriber circuit is in use, the disconnect switch disconnects the subscriber circuit and the subscriber line monitoring test circuit to prevent the subscriber circuit from malfunctioning. Further, it operates in the same way even if the subscriber circuit becomes in use during measurement in the subscriber line monitoring test circuit.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a block diagram showing an embodiment of a subscriber line maintenance monitoring system according to the present invention.

In FIG. 1, 2 is a subscriber circuit accommodating a telephone subscriber 1, and this subscriber circuit 2 is connected to a subscriber line testing circuit 9 for monitoring the insulation and capacitance characteristics of each subscriber circuit in a telephone exchange. A disconnect switch 4 that disconnects the subscriber line test circuit from the subscriber circuit while the circuit is in use, a call monitor that monitors whether the subscriber circuit is in an unused state, a current supply circuit 3, and a telephone subscriber 1 when a fault occurs. It also includes a subscriber line disconnection switch 10 for disconnecting the subscriber line from the subscriber circuit 2, and a codec circuit 5 for converting analog transmission into digital signals and digital signals into analog transmission. Also, a concentrator rack <M?> that sends and receives audio and control signals from the codec circuit. ) have 6.

Furthermore, it is comprised of a central processing unit (CC) 7 and software 8 that receive and recognize fault notifications obtained by the subscriber line testing circuit 9.

In FIG. 2, the signal format between the subscriber circuit and the concentrator frame is shown, and in FIG. 3, the SD signal format shown in the upper diagram is shown.

A bit capacity diagram of the SCN point 1 time slot is not shown.

Next, the operation of the embodiment shown in this figure will be explained.

First, the call monitoring and current supply circuit 3 measures whether the subscriber circuit 2 is in an unused state, and the L S of the SCN signal accommodation diagram in Fig. 3 is measured.
Central processing unit 7 and software 8
to notify. When the subscriber circuit 2 is in an unused state, the software 8 stores the cutoff switch drive signal in the SD point in the SD signal accommodation diagram in FIG. 3 and sends it to the subscriber circuit 2. The subscriber circuit 2 selects a disconnection switch drive signal from the received SD point in the concentrator rack subscriber circuit amount signal format shown in FIG. Upon receiving the signal, the subscriber line test circuit 9 turns on the disconnection switch 4 and monitors the insulation and capacity characteristics of the subscriber line in the telephone exchange. The fault information detected by the subscriber line test circuit 9 is shown as an error (line fault information) in FIG.
The N signal is accommodated in the LT bit of the signal accommodation diagram, and the line concentrator rack (LCF)
) 6 to the central processing unit (CC) 7. Then, notify the software that a problem has been reported.

The software recognizes that there is a failure report and types it out on a typewriter (not shown), and also sends a control signal to the central processing unit 7 and the subscriber line disconnection switch 10, which is always in the connected state under normal conditions. The signal is passed through the line concentrator rack, received at the SD point shown in FIG. 3, and sent to the subscriber circuit 2. The subscriber circuit 2 that has received the signal turns off the subscriber line disconnection switch 10 to disconnect the subscriber line between the subscriber circuit 2 and the telephone subscriber 1.

This allows maintenance test personnel to respond quickly and make repairs, and if the monitoring test results show an error, they can disconnect the subscriber's line from the subscriber's circuit. This has the effect of avoiding the effects of

〔Effect of the invention〕

According to the present invention, a circuit monitors the insulation and capacitance characteristics of the subscriber line side in a telephone exchange, immediately reports a failure, sends a failure message to maintenance personnel, and connects the telephone subscriber and the subscriber line. By separating the subscriber circuit from the subscriber circuit, the subscriber circuit can be prevented from being affected by fault factors. In addition, maintenance personnel can immediately repair the fault by testing the subscriber's line.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the signal format between the subscriber line and the concentrator frame, and Fig. 3 is the SD and SCN point/time slot bits in Fig. 2. It is an explanatory diagram of accommodation. 1...Telephone subscriber 2...Subscriber circuit 3...
・Call monitoring and power supply circuit 4... Cutoff switch 5... Codec circuit 6
...Concentrator rack 7...Central processing unit 8...
・Software 9...Subscriber line monitoring test circuit 10...Subscriber line disconnection switch agent Patent attorney Masaru Ogawa Man's side 2 Kasumi (JA@Dan A Sea Collection 4 Sei Ogiki Kaya 4 Morigo Ri 2)゛Porridge'5FigurejJU4Bl'b $, LM, 1M5cN 4
E+1) 17,54fj4(b)

Claims (1)

[Claims] 1. Install a subscriber line monitoring test circuit for each subscriber circuit to test the insulation and capacitance characteristics of the subscriber line up to the terminal equipment accommodated in the exchange, and periodically notify the subscriber of the test results. A subscriber circuit comprising: a disconnection switch for disconnecting a line monitoring test circuit from the subscriber circuit; and a subscriber line disconnection switch for receiving fault information from the subscriber line monitoring test circuit and disconnecting the telephone subscriber and the subscriber line. maintenance monitoring method for personal lines.