JPH0720176B2 - Switching line common line fault handling method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a common line fault processing method in an exchange having a processing function of a common line signal transmitted on a signal line.

[Conventional technology]

In the conventional common line fault processing method in an exchange having a common line signal processing function, a common line signal for call control is transmitted / received to / from another exchange via a signal line connected to a signal processing device. There is. At this time, even if a failure occurs in the signal processing device or the signal line and the transmission and reception of the common line signal between the stations cannot be performed at all, the call initializing process is not performed. In a relay station switch that cannot monitor the common line signal for call control, if the signal processing device or the signal line fails, the call that is already in the call state is accommodated in the switch of the terminal station. There is no way to detect whether a given subscriber has disconnected. Therefore, the call state of the call is continuously maintained.

When such a state continues for a long time, the conventional exchange prints out the long-term hold message of the call line from the typewriter and prompts the maintenance personnel to perform the forced release operation of the call using the corresponding call line. It was

[Problems to be Solved by the Invention]

In the conventional method described above, until the maintenance person intervenes,
Common resources such as a communication path and a call control memory in the exchange will be invalidated and held. Therefore, there is a problem in that not only call connections that do not rely on the common line signaling system are hindered, but also incorrect billing information is collected when the exchange processing of the relay station is performing billing processing. It was

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and when a signal processing device or a signal line has a failure, it smoothly connects a call that does not rely on the common line signaling system and prevents abnormal charges for the call. The purpose is to get a scheme.

[Means for Solving the Problems]

A common line fault processing method for an exchange according to the present invention is a common line signal control means for monitoring and controlling a signal processing device to detect a fault in the signal processing device or the signal line, and a signal state from the common line signal control means. It periodically captures and monitors the failure duration of the signal processing device or signal line, and when the failure duration reaches a predetermined condition, the common line signal for call control is sent and received only on the faulty signal line. Signal line failure time monitoring means for generating a pseudo recovery signal, and call connection control means for treating the call as if it were a normal recovery signal and releasing the call. It is characterized by having.

[Action]

According to the present invention, the failure duration of the signal processing device or the signal line is monitored, and when it reaches a predetermined condition,
A pseudo recovery signal is generated for a call in which a common line signal for call control is transmitted and received only on the faulty signal line, and this pseudo recovery signal is treated as a normal recovery signal to release the call. I do. As a result, even if the signal processing device or the signal line becomes an obstacle, the common resources of the exchange can be released automatically without any special operation by the maintenance person, and the connection of calls other than common line signaling can be smoothly performed. It also prevents abnormal charges for calls.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows the configuration of a common line signaling system to which the common line fault processing system of the present invention is applied. Referring to FIG. 2, the exchange 11 of the terminal station and
13 is connected via the exchange 15 of the relay station. Each of these exchanges 11, 13, 15 includes a communication path 20, a central control device 30, a main memory device 40, and a signal processing device 50. The communication path 20 of the exchange 15 of the relay station is, on the other hand, the communication line 71
Is connected to the call path 20 of the exchange 11 of the terminal station, and is connected to the call path 20 of the exchange 13 of the terminal station by the call line 73 on the other hand. Subscriber terminals 61 and 63 are accommodated in the communication paths 20 of the exchanges 11 and 13 of the terminal station, respectively.

Further, the signal processing device 50 of the exchange 11 of the terminal station is
81 is connected to the signal processing device 50 of the exchange 15 of the relay station, and the signal processing device 50 of the exchange 13 of the terminal station is similarly connected to the signal processing device 50 of the exchange 15 of the relay station by the signal line 83. The signal lines 81 and 83 may be a single signal line or a signal line group composed of a plurality of signal lines, and are collectively referred to as a signal line in the present specification.

A subscriber 61 accommodated in the communication path 20 of the exchange 11 of the terminal station,
The call lines 71 and 73 are used for a call with the subscriber 63 accommodated in the call path 20 of the exchange 13 of the terminal station. The signal for call connection control at that time is the signal line 81 as the common line signal.
And is transmitted and received between the signal processing devices 50 of the exchanges 11 and 13 of the terminal station and the exchange 15 of the relay station.
When the subscribers 61 and 63 are in a call state, the exchange 15 of the relay station
In order to monitor the end of the call, the fact that a call using the call lines 71 and 73 connected by the call path 20 is busy is registered in the call control memory area in the main storage device 40, and the call is restored. Wait for the signal.

If a failure occurs in either of the signal lines 81, 83 or the signal processing device 50 of the exchange 15, the exchange 15 of the relay station
Then, the common line signal from the exchange 11 or 13 of the terminal station cannot be received, and the restoration signal does not reach. In such a case, in the exchange 15 of the relay station, the call status monitoring function is activated, and the signal processing device 50 or the signal lines 81, 83
For the call whose disconnection monitoring cannot be performed due to the failure of, set the non-charged call display or execute the forced release process.

The state monitoring function and the forced call release processing will be described below.

FIG. 1 is a functional block diagram showing an embodiment of the present invention. In this embodiment, a main memory 40 has a call control memory area 42 for storing the call status and signal lines 81, 8
The signal line status table 44 that stores the status of 3 is set. Further, the central control device 30 internally monitors and controls the signal processing device 50 to perform transmission / reception of a common line signal and to detect a failure of the signal processing device 50 or the signal lines 81 and 83, and to determine the signal state by the signal line. The common line signal control unit 32 stored in the state table 44, the signal state stored in the signal line state table 44 is periodically read, and the signal processing device 50 or the signal line 8 is read.
Signal line fault time monitoring unit that monitors 1,83 fault durations
34, a call connection control unit 36 that performs call state management and connection control using the call control memory area 42, and a billing process that performs call charge settlement based on the information stored in the call control memory area 42 It has a section 38.

Next, the operation will be described. The common line signal controller 32 constantly monitors the signal processing device 50 or the signal lines 81 and 83 for failures. When the common line signal control unit 32 detects that a failure has occurred in the signal line, the main memory device is provided for the signal line whose communication is stopped due to the failure, for example, the signal line 81.
The corresponding part of the signal line status table 44 in 40 is changed from "normal" to "abnormal", and then recovery of the fault is monitored.

The signal line failure time monitoring unit 34 periodically reads out the signal line status table 44, and determines whether or not the failure has continued for a predetermined time or more for the signal line 81 in failure.
The following processing is executed.

(1) When the failure duration exceeds the non-billing call setting timing, the communication line groups capable of transmitting and receiving the common line signal for call control only on the signal line 81 in the failure are extracted, and those communication line groups are extracted. A call line that is already in a call state is detected, and a non-charge call display is set in a portion of the call control memory area 42 corresponding to a call using the call line.

(2) When the failure duration exceeds the forced release timing of the call, the call control memory area 42 during the call is searched by the above-mentioned procedure to generate the pseudo recovery signal for the corresponding call, and it is as if the terminal station The recovery signal is sent to the call connection control unit 36 as if it was received from the exchange 11.

Upon receiving the pseudo recovery signal generated by the signal line failure time monitoring unit 34, the call connection control unit 36 treats it as a normal recovery signal and releases common resources such as the call control memory area 42 and the communication path 20. At the same time, the call line is released. Further, in the billing processing unit 38, when the call charge of the corresponding call is calculated, the settlement of the call charge is omitted for the call for which the non-charged call display is made in the call control memory area 42.

〔The invention's effect〕

As described above, according to the present invention, when a failure duration time of the signal processing device or the signal line reaches a predetermined condition, a call in which a common line signal for call control is transmitted and received only in the signal line in failure. It is possible to release the call by generating a pseudo recovery signal with respect to the call. Therefore,
Even if the signal processing device or the signal line becomes an obstacle, the common resource of the exchange is automatically released without any special operation by the maintenance person, and the burden on the maintenance person can be reduced. Furthermore, by setting two types of the above conditions, setting the non-billing call display on the one hand, and forcibly releasing the call on the other hand, connection of a call other than the common line signaling system is performed when the signal processing device or the signal line fails. Is performed smoothly, and there is an effect that abnormal charges for calls can be prevented.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a common line fault processing system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a switching network based on a common line signaling system to which the present invention is applied. Explanation of symbols of main parts 11,13,15 …… Switchboard 32 …… Common line signal control unit 34 …… Signal line failure time monitoring unit 36 …… Call connection control unit 50 …… Signal processing device 81,83 …… Signal Line

Claims (1)

[Claims] 1. A common line fault processing system for an exchange, which is connected to another exchange through a signal line connected to a signal processing device and has a function of processing a common line signal transmitted on the signal line. The method is to monitor and control the signal processing device to transmit and receive the common line signal, and to detect a failure of the signal processing device or the signal line, and a common line signal control means. For periodically controlling the signal processing device or the signal line by monitoring the fault duration of the signal processing device, and when the fault duration reaches a predetermined condition, the call control is performed only by the faulty signal line. Signal line failure time monitoring means for generating a pseudo recovery signal for a call in which the common line signal is transmitted and received, and the pseudo recovery signal when the pseudo recovery signal is received from the signal line failure time monitoring means. Common line failure handling method of the exchange, characterized in that it comprises a and a call connection control means for release of the normal recovery signal and the call handling to the same.