JPH01292458A - Communication network system - Google Patents

Abstract

PURPOSE:To duplicate and distribute a network system by including an order table storing the connection order of lines in each terminal in a communication control equipment connected between plural computers and plural terminals. CONSTITUTION:The communication control equipment 11 is connected to the computers 9, 11 respectively through lines A, B. On the other hand, the terminals 1-8 are also connected to the equipment 11 and the equipment 11 is provided with the order table 12 storing the line connected to each terminal out of the lines A, B and its connecting order. Respective tables 1-8 is connected to the line with the 1st order by referring the table 12, and when there is no abnormality, connection processing based upon the table 12 is executed. When abnormality is detected, connection with the line obtained by reducing the order of the table 12 by one is executed. Thus, the load distribution of one computer can be attained by a definition (ordering) method.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication network system that accesses a plurality of computers from a plurality of terminals.

This is a system configuration diagram when used, with 1 to 4 representing terminals using the computer 9, and 5 to 8 representing terminals using the calculation R10. Terminals 1 to 4 and computer 9 are connected to line A, and terminals 5 to 4 are connected to line A.
8 and computer 10, communication was organized overnight on line B,
Communication interference is prevented.

Next, the operation will be explained. When terminals 1 to 4 use Calculation [9, they access computer 9 through line A and receive services. Similarly, when terminals 5 to 8 use computer 10, they access computer 10 through line B and receive services.

[Problem to be solved by the invention]

Conventional network systems are configured as described above, so if line A or B becomes unavailable for some reason, that line A or B cannot be used until it is restored. The disadvantage was that it was not possible to use terminals that Further, there was a problem that one terminal could only access l computers.

This invention was made to solve the above-mentioned problems, and when one line becomes unavailable, other lines are used to access other computers, so that the terminal is not used all the time. The purpose is to provide a network system that is guaranteed.

[Means to solve the problem]

In this invention, a plurality of computers 9. In a network system in which an IO and a plurality of terminals 1 to 8 are connected via a plurality of lines A and B for data communication, 131 terminals 9.
A communication control device 11 is provided between the lines A and I3 on the 10 side and the plurality of terminals 1 to 8, and a ranking table 12 for storing line ranking information is provided in the communication control device 11. Terminals 1 to 8 are connected to computers 9 and 1
0 via line B or A in the corresponding order.

[Effect]

When terminals 1 to 8 and calculation 8319.10 are connected according to the rankings for each line A and B determined in advance in the ranking table 12, if the number of times A or B is unavailable for some reason, this applies. Terminal 1 using line A or B
8 is assigned the next line B or A, and terminals 1 to 8 become available for use.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 to 8 are terminals that use the computer 9 or 10, and II is the terminals 1 to 8 and the computer 9. This is a communication control device that manages lines A and B that connect IO.

Each terminal 1 to 8 is connected to the communication control device 1 via a node not shown.
．． each connected to a total of 37. The devices 9 and 10 are connected to a communication control device 11 via dedicated lines A and B, respectively. In the communication control device 11, the order of lines to be connected preferentially is defined in advance.

FIG. 3 is a flowchart of the operation of the communication control device 11. This process is performed when the line is started up or when a line abnormality occurs.

Next, the operation of the embodiment will be explained according to the flow shown in FIG. First, in step S+, each of the terminals 1 to 8 is connected to a corresponding computer via a corresponding line according to the ranking defined in the ranking table 12 of the communication control device 11. In step S2, it is determined whether there is any abnormality in either line A or B, and if there is no abnormality, processing is performed as initially defined. That is, FIG. 4 shows the case where there is no abnormality in the line, and each terminal is ranked according to the ranking, terminal 1. Terminals 2 and 2 are connected to computer 9 via line A, and terminals 3 and 4 are connected to computer IO via line B by communication control device 11, respectively. If there is an abnormality on the lines A and B, the process advances to step S3, and the communication control device 11 lowers the order of the lines. Next step S
In step 4, it is checked whether a lower line is defined, and if so, the process goes to step Sl.

FIG. 5 shows a case where the computer 9 is unavailable, and the terminal 1.2 is also switched to the computer IO via the line B as a process when a line abnormality occurs.

Similarly, FIG. 6 shows a case where the computer 10 is unavailable,
As a process when a line abnormality occurs, the terminals 3 and 4 are also switched to the computer 9 via the line system.

In the above embodiment, the backup function was explained, but depending on the way of definition (ranking), it is possible to share the load of one computer.

〔Effect of the invention〕

In a network system that connects multiple computers and multiple terminals via multiple lines for data communication, a communication control device is provided between the computer side line and the multiple terminals, and the line is connected within this communication control device. A ranking table that stores ranking information is provided, and based on the information in this ranking table, terminals are connected to computers via lines in the relevant rankings, making it possible to duplicate and decentralize the network system and improve system efficiency. This has the effect of improving reliability.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a communication network system of the present invention, and FIG. 2 is a diagram showing an example of a ranking table of the present invention.
FIG. 3 is a flow diagram showing the operation of the present invention. 1 to 8...terminal, 9,10...computer, 11...
Communication control device, 12...ranking table, A, B...
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Claims (1)

[Claims] In a network system that connects a plurality of computers and a plurality of terminals via a plurality of lines to perform data communication, a communication control device is provided between the line on the computer side and the plurality of terminals, and the communication control device A communication network system comprising: a ranking table for storing line ranking information; and based on the information in the ranking table, the terminal is connected to the computer via the line in the order of the line ranking information.