JPH07123083A - Back-up system for communications line - Google Patents

Abstract

PURPOSE:To back up a communications line of a computer on-line system at low cost when the line has a fault. CONSTITUTION:A public ISDN subscriber line 7 is prepared in addition to a private communications line 6. A line constitution control table 4 stores the switching/non-switching instructions of a fault mode, the correspondence between the line 6 and the line 7, and the ISDN subscriber number of the opposite party system. When a fault of the line 6 is detected by a circuit control part 5, a communication control part 3 refers to the table 4 and instructs the part 5 to set up a communications line via an ISDN line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication line backup system, and more particularly to a communication line backup system in a computer online system.

[0002]

2. Description of the Related Art Conventionally, in a computer online system, when some kind of failure occurs in a communication line, the online processing using the communication line is interrupted and the recovery of the line failure is waited for. There is.

[0003]

In the computer online system described above, when a failure occurs in the communication line, the online processing must be interrupted, and even if a plurality of processing equipments are provided, the service deteriorates and the backup is lost. As a result, preparing a dedicated communication line has a problem that the cost increases.

[0004]

The communication line backup system of the present invention is a communication line backup system in a computer online system, which is a dedicated communication line normally used and a public ISDN subscriber used when a failure of this communication line occurs. A line configuration management table that stores the correspondence with the line, designation of whether or not to use the ISDN line when the communication line fails, the ISDN subscriber number of the partner system of the communication line, and the normal communication control table In addition, the communication control means for extracting the ISDN subscriber number of the other system by referring to the line configuration management table when the communication line failure notification is received, and the communication control means when the communication line failure is detected. Notify the failure to the ISDN, obtain the ISDN subscriber number extracted by the communication control means, and connect to the ISDN line. There, constructed by having a line control unit for use in switching the communication line to the ISDN line.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.
The embodiment shown in FIG. 1 shows a case where one dedicated communication line is used. The computer system 1 includes an online program 2 for performing online processing, and a communication control unit 3 for performing communication control and switching control to a backup line. , Necessity of backup for all communication lines of the computer system 1 specified by the user, public ISDN subscriber number of the partner system at the time of backup, and communication uniquely determined with the partner system A line configuration management table 4 that stores line identification numbers, and a line control unit 5 that controls lines and performs actual communication processing
, Dedicated communication line 6 and ISD used as a substitute
It is composed of N subscriber lines 7.

The backup operation of the communication line in the above configuration will be described. First, when the line control unit 5 detects an abnormality in the communication line 6, the line control unit 5 notifies the communication control unit 3 of the abnormality. The communication control unit 3, which has been notified of the abnormality of the line, refers to the line configuration management table 4 and checks whether the communication line 6 having the failure is designated as a backup. If backup is specified for communication line 6,
In order to execute the backup by the ISDN line, the line control unit 5 is requested to connect the backup ISDN line. At this time, the communication control unit 3 acquires the subscriber number of the partner system for connecting to the ISDN line from the line configuration table 4 and notifies the line control unit 5 of it. If no backup is specified, the line failure is notified to the online program as in the past.

The line control unit 5 requests line connection via the ISDN subscriber line 7 in accordance with the connection request from the communication control unit 3. Then, when the connection is completed, the communication control unit 3 is notified to that effect. The communication control unit 3, which has been notified that the ISDN subscriber line 7 has been connected to the partner system, performs the online processing that was being executed via the communication line 6 on the ISD.
In order to connect with the N line, the backup process start procedure is performed with the communication control unit of the partner system, and if the use of the ISDN line for backup is established with the partner system, the communication line 6 is used. The online processing that was being performed is connected via this ISDN line.

When a series of online processing is completed and a request for closing the communication line 6 is issued from the online program 2, the communication controller 3 issues a request for closing the ISDN line used as a backup line.
To disconnect the ISDN subscriber line 7. After this,
When the online program 2 that uses the communication line 6 is activated again, the communication line 6 is used. If the failure has not been recovered, repeat the same procedure for backup IS.
Use a DN line.

[0010]

As described above, according to the present invention, when a line failure occurs in an important communication line in a computer online system, the public ISDN line can be used as a temporary backup to back up the communication line. There is an effect that the cost can be suppressed and the cost can be reduced as compared with the case where a dedicated communication line is owned.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Computer System 2 Online Program 3 Communication Control Unit 4 Line Configuration Management Table 5 Line Control Unit 6 Communication Line 7 ISDN Subscriber Line

Claims (1)

[Claims] 1. In a communication line backup method in a computer online system, correspondence between a normally used dedicated communication line and a public ISDN subscriber line used when this communication line fails, and ISDN when the communication line fails When a line configuration management table storing designation of whether or not to use a line and the ISDN subscriber number of the partner system of the communication line, and notification of a failure of the communication line in addition to normal communication control Communication control means for extracting the ISDN subscriber number of the other system by referring to the line configuration management table and ISDN extracted by the communication control means when the failure of the communication line is detected, the communication control means is notified of the failure. Obtain the subscriber number, connect the line by ISDN line, and switch the communication line to this ISDN line for use. A communication line backup method comprising: