JPH02288590A - Channel control system - Google Patents

Abstract

PURPOSE:To switch the system easily to the individual line signal system in the occurrence of a fault of a common line by applying channel control by a common line signal and an individual line signal in parallel and making the control information by the individual line signal invalid when the common line signal link is normal. CONSTITUTION:An electronic exchange is provided with a function recognizing a fault of a common line signal link and a fault recovery, a function publicating a control request to a control terminal control program for a call connection with a common line signal in parallel, and a function invalidating the processing request from the terminal control program during the control in the common line signal system. When the exchange service is controlled by the common line signal system, the individual line signal control is implemented in parallel and the processing request from the terminal control program is discriminated to be invalid during the control with the common line signal system. Thus, the recognition of the signal link fault, the automatic changeover from the common line signal control to the individual line signal control, the recognition of the signal link fault recovery and the automatic changeover from the individual line signal control to the common line signal control are attained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic switching system that employs a common line signaling method, and in particular, when a common line signal path that transmits control signals for call connection control is used due to a failure. Basic call connection method using individual line signal control in case of failure [Conventional technology] Conventionally, as a countermeasure against common line signal link failure, Japanese Patent Laid-Open No. 6
No. 2-48175 discloses a control system in which the common line signaling system is switched to the individual line signaling system.

However, the specific means for realizing signal system switching control has not been clarified. Although it is a method of switching to a signal,
No consideration was given to the recognition system for signal link failures and failure recovery, and the switching control system between common line signals and individual line signals. We have established a concrete implementation method for automatic switching from signal control to individual line signal control, recognition of signal link failure recovery, and automatic switching from individual line signal control to common line signal control, and we have established a concrete implementation method for automatic switching from signal control to individual line signal control, recognition of signal link failure recovery, and automatic switching from individual line signal control to common line signal control. This is to make effective use of the

[Means to solve the problem]

The above purpose is a program for controlling a telephone line terminal (hereinafter referred to as a "terminal control program").

and a program that receives a processing request from the terminal control program, analyzes it, issues a control request again to the terminal control program, and performs the exchange service (hereinafter referred to as the "exchange processing program"). A function to recognize line signal link failures and failure recovery, a function to issue control requests in parallel to the terminal control program when the call connection is being controlled by common line signals, and a function to issue control requests in parallel to the terminal control program when the call connection is being controlled by the common line signal method. This is achieved by adding a function to invalidate the processing request of K.

[Effect]

Under individual line signal control, the terminal control program has a logical interface with the exchange processing program,
An individual line signal corresponding to the call status 11 is transmitted to the opposite station according to instructions from the exchange processing program. Further, the received individual line signal from the opposite station is communicated as a processing request to the exchange processing program, so that the exchange processing program 2 performs an exchange service by controlling the individual line signal.

The present invention performs individual line signal control in parallel even when switching services are controlled using the common line signaling system, and determines that processing requests from the terminal control program are invalid while being controlled using the common line signaling system. It is possible to easily switch from control using common line signals to control using individual line signals.

〔Example〕

Embodiments of the present invention will be described in detail using FIGS. 1 to 7. FIG. 1 is an example in which the parallel control mechanism for common line signals and individual line signals according to the present invention is incorporated into a general electronic exchange call processing program. Furthermore, FIG. 2 is an example of a general electronic exchange system that employs a common line signaling system. The call processing program shown in FIG. 1 operates in a general electronic exchange shown in FIG.

First, FIG. 2 will be explained.

The switching center 1.1' has an exchange switch 2.2', a central control unit 3.3', a memory 4, 4', and a telephone trunk 5°5.
', and a common line signal processing device 6.6', and these switching stations 1.1' are connected by a communication path 7 and a common line signal path 8. A terminal 9.9' is housed in the terminal.

Note that the above shows the logical configuration of parts closely related to the present invention. - In addition to the above, there are other components in the exchange, such as an external storage device and a maintenance terminal, but these are not shown because they are not directly related to the present invention.

Next, FIG. 1 is a software configuration diagram showing an example in which the common line signal and individual line signal control mechanism according to the present invention is incorporated into a numerical exchange processing program.

#! Referring to FIG. 1, individual line signal control will first be explained with reference to normal call operations, taking an incoming trunk incoming call connection as an example. First, the terminal control program detects a call from the opposite station and reports it to the exchange processing program.Next, the exchange processing program is controlled by a normal state transition method, and when it receives a call report, it determines the type of trunk, It analyzes the service etc. and issues a processing request to the terminal control unit to connect a dial pulse (NP) signal or pukshe button (pB) signal receiver and receive numbers. The exchange process is executed in the same manner thereafter.

Next, common line signal control will be explained with reference to the same FIG. First, the common line signal control program receives an initial address signal from the opposite station and reports it to the exchange processing program. Next, the exchange processing program analyzes the trunk type, service, etc. in the same manner as individual signal control, and executes exchange processing.

In this way, the exchange processing program performs individual line signal control and common line signal control, but as shown in Figure 1, when control is being performed using individual line signals, processing requests to the common line signal control program are issued. 1. Furthermore, even during control using common line signals, processing requests to the terminal control program are issued in the same way as during individual line signal control.

FIG. 3 shows the sequence of individual line signals and common line signals transmitted and received between the exchange 1 and the exchange 1' using the processing method described above, taking as an example an originating/receiving connection based on common line signal control.

When the number of terminal 9' is dialed from terminal 9 to make a call to terminal 9', an address signal (IAI) is sent as a common line signal from switching center 1 to establish an outgoing/outgoing connection, and At the same time, an activation signal is sent as an individual line signal to the exchange 1' via the telephone line. Switching station 1' determines that it is under common line signal control, so it disables the activation signal, which is an individual line signal, receives and analyzes the IAI signal, which is a common line signal, calls terminal 9', and sends a message to switching station 1. An address completion signal (Acy) is returned as a common line signal. Thereafter, when the terminal 9' responds, it transmits a response signal (ANM) as a common line signal and a response signal as an individual line signal to the exchange 1. Since the exchange 1 is under control of the common line signal, the individual line signal is invalidated, and the terminals 9 and 9' are set to be in the middle of a call due to the ARM reception of the common line signal.

The same method is used to recover a call from one call in progress.5 In this way, the exchange processing program controls the current call connection based on the status of the common line signal link, either by using the common line signal or by using the individual line signal. Decide what you want to do and execute it. If the common line signal link is recognized to be faulty from this K, the basic call connection is continued by validating the individual signal from the speech line.

Figure 4 is a reference for a program that recognizes the status of a common line signal link and for an exchange processing program to determine whether to control a call connection using a common line signal or an individual line signal depending on the status of the common line signal link. FIG. 2 is a diagram showing the structure of a signaling management table and their mutual relationships. First, the signal link status recognition program scans the status of the signal link by starting periodically for about 10 seconds. First, a case where a failure occurs in a normal signal link will be explained as an example. If a failure occurs when the signal link is in a state where the signal link fails during operation, the failure gas counter is incremented by 1. If the same procedure causes a problem in the next cycle and subsequent cycles, the corresponding counter will be incremented by 1.

As a result, if the counter reaches a predetermined value, it is regarded as a fixed failure of the signal link, and the contents of the signaling management table are changed so that control is performed from common line signals to individual line signals. Also, when the signal link becomes normal from a faulty state, the same procedure is used to recognize that the signal link has become normal, and in this case, the signaling management table is controlled from the individual line signal to the common line signal. Make changes to the content.

The signaling management table is referred to during the call connection process by the switching processing program described using FIGS. 1 and 3 as an example, and is used to control the common line signaling system or the individual line signaling system.

Next, an example of actual operation of the present invention in the common line signal network configuration shown in FIG. 7 will be described.

When connecting a terminal 9 accommodated in switching center 1 to a terminal 9' accommodated in switching center 1', if route 1 as a common signal path is in failure, route 2 as a detour route is used. If exists, the connection is executed by detouring to route 2. However, if route 2 of the bypass route does not exist or route 2 is also faulty, the system according to the present invention
The call line between the exchange 1 and the exchange 1' is switched from common line signal control to individual line signal control to connect the call.

FIG. 5 shows that when the common line signal link is in a normal state, one call line is controlled by the common line signal method, and the call is in progress 11! 2 is a diagram illustrating a common line 0 individual line signal sequence in the case where the call recovery process and subsequent processes are switched to control using individual line signals and executed due to a failure in the signal link while the current call is in the middle of a call. .

Figure 6 shows that, contrary to the example in Figure 5, when the common line signaling link is in a failure state, the call that has occurred is controlled by the individual line signaling system and set to a busy state, but the call is still in a busy state. FIG. 2 is a diagram showing a common line 1 individual line signal sequence when the recovery process of a voice call and the subsequent processes are switched to common line signal control from the recovery IBK of a signal link failure.

〔Effect of the invention〕

As explained above, according to the present invention, when a failure occurs in a common line signal link, it is possible to easily switch to control using the individual line signaling method, and the communication line during the signal link failure can be controlled by the individual line signal control. It can be used effectively, and at the same time, when the signal system is switched, the call state is maintained without causing any damage to the call that is in progress at that time, so the service quality is not degraded.

In addition, conventional systems basically adopted a redundant configuration of signal links to prepare for signal link failures, but the present invention makes it possible to eliminate redundant configurations and significantly reduce the cost of the common line signaling system. can.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a software configuration incorporating a parallel control function of common line signal control and individual line signal control, and FIG. 2 is a configuration diagram showing an embodiment of the present invention. Figures 3, 5, and 6 are diagrams showing the signal sequences of the common line and individual lines by parallel control of the common line 9 individual lines, and Figure 4 shows the signal link state recognition program, the signaling management table, and FIG. 7, which is a diagram showing the interrelationship of exchange processing programs, is a network configuration diagram explaining the present invention in detail. 1) 1'...... Exchange 2'... Exchange switch 3'... Central control unit 4'... Memory 5'...Telephone trunk 6'...Common line signal processing device...
・・・・・・・・・Communication path・・・・・・・・・・・・・Common line signal path section 1
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Claims (1)

[Claims] 1. Communication path control using common line signals and communication path control using individual line signals are performed in parallel, and when the common line signal link is normal, communication path control information based on individual line signals is invalid information, and communication path control information using individual line signals is used as invalid information. 1. A communication path control system characterized in that communication path control is performed based on a common line signal link failure, and communication path control is performed based on individual line signals when a common line signal link failure occurs. 2. The fault monitoring of the common line signal link is carried out by periodic activation for a certain period of time, and when a fault occurs, a fault recognition counter is counted, and when the counted value of the counter reaches a certain value, it is recognized as a common line signal link fault. The communication path control system according to claim 1, characterized in that: 3. The failure recovery monitoring of the common line signal link is carried out by periodic activation for a certain period of time, and at the time of failure recovery, a failure recovery recognition counter is counted, and when the count value of the counter reaches a certain value, the common line signal link failure recovery is performed. 2. The communication path control system according to claim 1, wherein the communication path control system recognizes the communication path. 4. A call is set based on control using common line signals, and when the common line signal link failure is recognized during the call, the call recovery process is performed based on control using individual line signals. 2. The communication path control system according to claim 1, wherein: 5. If a call is set up based on control by individual line signals and the above-mentioned common line signal link failure recovery is recognized during the call, the above-mentioned call recovery processing is performed based on control by common line signals. The communication path control system according to claim 1, characterized in that: