JPH01241956A - Electronic switching equipment - Google Patents

Abstract

PURPOSE:To specify a line fault location automatically and to reduce the recovery time by applying a fault diagnosis to a line interface section and a fault diagnosis to a line depending on the control of a pre-stage switch. CONSTITUTION:If a communication fault detection section 12 detects a fault, a pre-stage switch 4 is controlled to switch the local loopback test mode where line interface sections 71-7n and line fault diagnosis sections 101, 102 are connected to operate the line fault diagnosis section and the remote loopback test mode where the line fault diagnosis sections 101, 102 are connected to send/ receive a signal via lines 51-5n used by the line interface sections 71-7n to apply the line fault diagnosis section operation. Then a central processing unit 3 discriminates and controls whether or not a fault location is in the line interface section or in the line from the result of diagnosis in the modes. Thus, a fault location is located automatically and the recovery time is reduced.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to an electronic exchange that enables early recovery by identifying the location of the abnormality when an abnormality occurs.

(Prior art) In conventional electronic switching equipment, in the event of a line abnormality, maintenance personnel go to a predetermined location on the line between the switching center and the electronic switching equipment, and
Maintenance personnel interrupted the line using a tester and made calls to pinpoint the location of the fault. Therefore, there is a problem in that it takes time to recover from the occurrence of a line abnormality.

On the other hand, in recent years, electronic exchanges equipped with self-diagnosis functions have appeared, but in these electronic exchanges, the onboard CPU provided in the line interface section
An abnormality was detected due to the operation of the line, and it was not possible to isolate (identify) whether the cause was in the line interface section or the line side, and in the end maintenance personnel had to identify the fault location. There was a problem in that it took a long time to recover.

(Problems to be Solved by the Invention) As mentioned above, according to the conventional electronic exchange, when a line failure occurs, maintenance personnel have no choice but to go to the site and investigate to identify the abnormality. There was a problem in that it took a lot of time to recover. The present invention was made to solve the problems of conventional electronic exchanges, and its purpose is to provide an electronic exchange that can automatically identify abnormalities and thus shorten the time required for recovery. The goal is to provide the following.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a communication abnormality detection section that is connected to a line, exchanges signals via the line, and detects communication abnormality via the line. a line interface section comprising: a line abnormality diagnosis section for diagnosing line abnormality by transmitting and receiving test signals; and a line abnormality diagnosis section provided between the line interface, the line abnormality diagnosis section, and the line, and providing mutual communication between these sections. a pre-stage switch for switching connections; and when the communication abnormality detecting section detects an abnormality, controlling the pre-stage switch to connect the line interface section and the line abnormality diagnosing section to operate the line abnormality diagnosing section. a local loopback test mote that performs the operation, and a remote loopback that connects a line abnormality diagnosis unit to perform the operation of the line abnormality diagnosis unit so that signals can be sent and received via the line used by the line interface unit. The electronic exchange is equipped with a control means for switching to a test mode, obtaining diagnosis results from these motes, and determining whether an abnormality is located in the line interface section or the line.

(Function) According to the above configuration, it is possible to detect whether the line interface part is abnormal in the local loopback test mode, and whether the line is abnormal or not can be detected in the remote loopback test mode, and the abnormal location can be automatically identified. This is something that can be done easily.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 2 is a block diagram of a telephone system using an electronic exchange. In the figure, 1 indicates an electronic exchange, and this electronic exchange 1 exchanges signals between a telephone 100 (actually, multiple terminals) and a line 5 consisting of a central office line and a dedicated line, and is a network. The network unit 2 and the front switch 4 are connected by an internal connection 6, and the central processing unit 3 controls the network unit 2 and the front switch 4. do.

FIG. 1 shows a detailed configuration diagram of the electronic exchange 1. The network section 2 includes n line interface sections 71 to 7. ．．
i backup line interface units 81 to 81.2 line abnormality diagnosis units 101 and 102 are provided, and these are connected to the central processing unit 3 via the data highway 9. In addition, the network section 2 is provided with a telephone interface for connecting the telephone 11100 and the data highway 9, but this is omitted because it is not directly related to the present invention. The central processing unit 3 controls incoming calls, outgoing calls, and communications via the data highway 9, and also imports data (status) indicating whether there is any line abnormality from the line interface units b to 7□ at predetermined intervals. When data indicating a line abnormality is obtained, a local loopback test mode and a loopback test mode are executed as described later.

Here, the line interface section 7 is configured as shown in FIG. A line handling section 11 is connected to the line 5, and performs call origination, incoming call detection, and communication (talk) signal exchange under the control of an on-board CPU 13. Communication abnormality detection unit 1
2 detects whether the CPU 13 is operating abnormally or whether there is a communication abnormality such as communication being disabled, and holds the detection result as a status so that it can be imported from the data highway 9.

The CPU 13 controls the line handling section 11 under the control of the central processing unit 3 based on its own program.

Therefore, control signals are sent and received between the CPU 13 and the line handling section 11 or the central processing unit 3, the status is output from the communication abnormality detection section 12, and the communication signal is sent to and received from the line 5, the line handling section 11, and the communication abnormality detection section. 12. Data Highway 9
It is sent and received on the way. Further, the communication abnormality detection unit 12 receives the test signal sent from the line abnormality diagnosis unit 10, and
Outputs reception as a status.

The pre-stage switch 4 in FIG. 1 is controlled by the central processing unit 3 and normally connects the lines 51 to 5n and the line interface section 7. ~7. If necessary, under the control of the central processing unit 3, the line interface section 7 and the line abnormality diagnosis section 101 (or 102) or the line abnormality diagnosis section can be connected via the line 5. 101 and 102 are connected to each other, and the protection line interface section 8 is further connected to the line 5.

The backup line interface section 8 is used in place of the line interface section 7 in which the abnormality has occurred, and has exactly the same configuration as the line interface section 7. The line abnormality diagnosis unit 10 has a call origination/reception function and a predetermined test signal transmission/reception function, and determines whether or not the test signal has been transmitted by the central processing unit 10.
Notify. Here, 101 or test signal transmission, 10
Although 2 is shown as transmitting a test signal, one device may be connected to two lines and transmit and receive signals.

The electronic exchange 1 configured as described above operates as follows. The central processing unit 3 has each line interface section h to 7.
The status of the communication abnormality detection unit 12 is read at a predetermined period to detect whether there is any abnormality.

If an abnormality is detected in the status, the central processing unit 3 controls the front-stage switch 4 and connects the line interface unit 7 equipped with the communication abnormality detection unit 12 that issued the abnormal status and the line abnormality diagnosis unit 10. Connect as shown in Figure 4. Next, the central processing unit 3
, and instructs the line interface section 7 to make a call and send out a test signal. As a result, a test signal is sent from the line abnormality diagnosis section 10 and reaches the line interface section 7 via the front stage switch 4. If the line interface section 7 is normal, the line correspondence section 11 detects an incoming call, the communication abnormality detection section 12 detects the test signal, and sets the test signal reception status to active.

The central processing unit 3 reads this and determines that there is no abnormality in at least the line interface unit 7.

Furthermore, if the line interface unit 7 is abnormal, the test signal is not received and the status is inactive, so the line interface unit 7 is determined to be abnormal.

This is the diagnosis using the local loop test mode.

When the diagnosis using local loop test mode is completed,
Shift to remote loop test mode.

The central processing unit 3 controls the pre-stage switch 4 to ensure that the line abnormality diagnostic units 101 and 102 communicate with each other via the line 5 to which the line interface 7 equipped with the communication abnormality detection unit 12 that issued the abnormal status was connected. Connect as shown in Figure 5. Next, the central processing section 3 activates the line abnormality diagnosis section 1c and instructs it to make a call and send a test signal to the line 5 to which the line abnormality diagnosis section 102 is connected. As a result, a call is made, and if the line 5 is normal, the call arrives at the line abnormality diagnosis unit 102 and when the call is answered, a test signal arrives at the line abnormality diagnosis unit 102. The line abnormality diagnosis unit 102 that has detected the test signal sends data to the central processing unit 3 indicating that the test signal has been received. As a result, the central processing unit 3 determines that there is no abnormality in at least the line 5. In addition, if line 5 is abnormal, the line abnormality detection unit 102
The test signal does not arrive, including that the call does not arrive. Therefore, the central processing unit 3 receives data indicating that no test signal is received from the line abnormality detection unit 102, and determines that the line 5 is abnormal. This is a diagnosis using the motor loop test mode.

The central processing unit 3 makes a final determination as follows based on the results of the local loopback test mode and the loop bank test mode to the remote 1.

If it is determined that the line interface unit 7 is abnormal during this determination, the previous stage switch is switched so that the backup line interface unit 8 is connected to the line 5 to which the line interface unit 7 was connected instead of this line interface unit 7. Switch by controlling 4.

As a result of such operations, the automatically restored state is shown in FIG.

In addition, in the case of a line abnormality, the line 5 may be disconnected or information indicating the abnormal state may be displayed.

[Effects of the Invention] As explained above, according to the present invention, abnormality diagnosis for the line interface section and abnormality diagnosis for the line can be performed by controlling the front-stage switch, and the line abnormality location can be automatically and quickly identified. Therefore, the time required for recovery can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of a telephone system using an embodiment of the present invention, and FIG.
The figure is a block diagram of the main part of Figure 1, Figure 4 is a block diagram showing local loop test mode, Figure 5 is a block diagram showing remote loop test mode, and Figure 6 is a block diagram showing automatic recovery. . 1...Electronic exchange 2...Network section 3...Central processing unit 4...Pre-stage switches 51-5□...Line 71-7n...Line interface section 81-81...
・Preliminary line interface section 101, 102...Line abnormality diagnosis section 11...Line support section 12...Communication abnormality detection section Agent Patent attorney Noriyuki Chika Yudo Sanno -

Claims (1)

[Scope of Claims] A line interface section that is connected to a line and includes a communication abnormality detection section that exchanges signals via the line and detects communication abnormality via the line, and that transmits and receives test signals. a line abnormality diagnosis section for diagnosing a line abnormality; a pre-stage switch provided between the line interface, the line abnormality diagnosis section, and the line to mutually switch connections between these sections; and a communication abnormality detection section. a local loopback test mode in which the pre-stage switch is controlled to connect the line interface unit and the line abnormality diagnosis unit to operate the line abnormality diagnosis unit when the line abnormality diagnosis unit is detected; The line abnormality diagnosis unit is connected to send and receive signals via the line used by the interface unit, and the line abnormality diagnosis unit is switched to a remote loopback test mode in which the line abnormality diagnosis unit operates, and the diagnosis results from these modes are and control means for determining whether an abnormality is located in the line interface section or in the line based on the information obtained.