JPS6242646A - Control system for line switching device - Google Patents

Abstract

PURPOSE:To reduce expresses of an information processor and a communication control program by controlling a line switching device provided with a standard MODEM interface through the MODEM interface by the information processor. CONSTITUTION:Line switching devices 101 and 102 of systems 0 and 1 and information processors 103 and 104 of systems 0 and 1 are provided. Each line switching device has n numbers of data lines, and a MODEM is connected to the terminal side. Information processor-side data lines of line switching devices 101 and 102 are connected to both of communication controllers 107 and 108 of the information processor 103 of the system 0 and the information processor 104 of the system 1. Line switching devices are provided with control parts 105 and 106 for line switching control and are controlled by both communication controllers 107 and 108 through control lines of their own systems and control lines of the other systems. Control parts 105 and 106 are provided with standard MODEM interfaces, and they are controlled through standard MODEM interfaces by communication controllers 107 and 108 of information processors 103 and 104.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an online data processing system in an electronic computer, and more particularly to a control method for a line switching device that improves the reliability of data transmission processing.

〔overview〕

In a line switching control system, the present invention reduces the cost of an information processing device and a communication management program by controlling a line switching device equipped with a standard modem interface from an information processing device via a modem interface. be.

[Conventional technology]

Traditionally, in online data processing systems,
In order to improve reliability, we have created a redundant system with separate lines of data lines and information processing equipment.If a failure occurs in a data line or information processing unit, the line switching device will immediately switch to another line of data lines or information processing equipment. The system was designed to process information by switching to other devices.

However, in conventional line switching devices, line switching control is performed using a process input/output control device of an information processing device.

FIG. 4 is an equipment connection diagram of a conventional duplex system. This duplex system consists of a 0 system and a 1 system, and each system includes line switching devices 101 and 102 and information processing devices 103 and 104.

The 0-system and 1-system line switching devices 101 and 102 have one data line, and a demodulator (modem) is connected to each terminal side. The data line on the information processing device side of the line switching devices 101 and 102 is connected to the 0-system line switching device 10.
Both the 1.1 system line switching device 102 and the O system information processing device 103.1 system information processing device 104 are connected to each other, and the line switching device 101.102 can switch to either side. . This line switching device 10
1.102 data line is information processing device 103.10
It is connected to communication control devices 107 and 108 in 4.

The line switching devices 101 and 102 have process input/output control units 109 and 110, and these process input/output control units 109 and 110 are connected to both process input and output control units 111 and 112 in the information processing device, respectively. The process input/output control units 109 and 110 are the process input and output control units 111 in the information processing devices 103 and 104.
．． 112. Line switching is performed from the process input/output controller 111 or 112 to the process input/output controller 109, 110. Control either one.

To perform this line switching, from the information processing device's perspective, the information processing device assigns data that indicates a line group to each bit, and then executes a channel activation command to the process output control device. .

Furthermore, it is necessary to use the channel activation command to check the connection state of the line to the process input/output control device before and after executing the channel activation command.

[Problem that the invention seeks to solve]

For this reason, conventional line switching devices require a process input/output control device within the information processing device in order to control the line switching device, and information processing that controls the process input/output control device for line switching. There is a drawback that the device program becomes complicated due to bit operations and the use of channel control commands such as channel activation commands that take hardware into consideration.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control method for a line switching device that does not require a process human output control device and reduces costs for an information processing device and a communication management program.

[Means for solving problems]

The present invention is characterized in that a standard modem interface is provided in a line switching device, and a communication control device of an information processing device controls this standard modem interface to perform line switching.

[Effect]

A line switching device equipped with a standard interface is controlled and switched by a communication system '4B device of an information processing device using a standard modem interface.

〔Example〕

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

FIG. 1 is a device connection diagram regarding line control in the embodiment. This embodiment consists of two systems, 0 system and 1 system, and each system includes line switching devices 101 and 102 and information processing devices 103 and 104.

The O-system and 1-system line switching devices 101 and 102 have one data line, and a modem is connected to the terminal side of the data line.

Data lines on the information processing device side of the line switching devices 101 and 102 are connected to the communication control devices 107 and 108 of the O-system information processing device 103.1-system information processing device 104, respectively. The line switching devices 101 and 102 are each provided with control units 105 and 106 for line switching control, and the control units 105 and 106 are connected to the communication control devices 107 and 107 of the O-system information processing device, respectively. It is connected to both the communication control devices 10B of the information processing device 104, and can be controlled from both the communication control devices 107 and 108 using the own system control 'a line and the other system control line.

Control unit 105.10 of this line switching device 101.102
6 is equipped with a standard modem interface, and can be controlled by the communication control devices 107 and 108 of the information processing devices 103 and 104 using the standard modem interface.

The standard modem interface referred to here is CCIT.
Refers to the interface with communication control equipment and data terminals that has been standardized based on the recommendations of the International Telegraph and Telephone Advisory Committee (International Telegraph and Telephone Advisory Committee), and is C6361 of JIs (Japanese Industrial Standards).
and Electrical Industries Association of America (EIA) RS-232C.
It has been standardized as such.

Next, the operation of this embodiment will be explained with reference to FIG. FIG. 2 is a time chart when the data line of the information processing device 1 system is connected to the information processing device o system.

A indicates the point in time when the o-system information processing device 103 issues a pull-in command to the 1-system line switching device 102. The pull-in command is performed by a line oven command. This line open command turns on the data terminal ready (ER) line of the control line from the 0 system. 1 line switching device 10
2 switches the data line to the o system by turning on the data terminal ready (ER) line.

B is the time when line switching ends.

After this, at time C, the line switching device 102 of system 1 is set to data set ready (DR) on the O prefecture side where the line is accommodated.
line on, and turn off the data set ready (DR) line on the separated 1 system side. This ends the line open command.

D is the time point when the information processing device 103 issues a line close command. The line close command turns off the data terminal ready (ER) line for that control line. This is an operation to prepare for future line switching. When the data terminal ready (ER) line is off, the line switching device 102 does not operate.

FIG. 3 shows line accommodation states in a duplex system during normal times and during failures. In case a, both the 0-system and 1-system information processing devices are operating normally, and each information processing device is controlling one data line. b is a measure to be taken when the 1-system information processing device 102 fails, and the 0-system information processing device 101 also accommodates the data line of the 1-system information processing device 102. At this time, the control line of the information processing device issues a line open command to the 1-system line switching device 103, pulls in the 1-system data line, and processes all data lines with the 0-system information processing device.

〔Effect of the invention〕

In this manner, the present invention eliminates the need to use the process input/output control device of the information processing device to control the line switching device, and can be controlled by the communication control device.

Furthermore, since the line switching device can be easily controlled using general data communication commands, it is easy to create a communication management program for an online system using the present invention. Therefore, according to the present invention, the cost of the information processing device and the cost of the communication management program can be reduced.

[Brief Description of the Drawings] Fig. 1 is a connection diagram of line switching equipment according to an embodiment. Figure 2 is a time chart for line switching. FIG. 3 is an explanatory diagram of line accommodation when the information processing device is normal and when there is a failure. FIG. 4 is a conventional equipment connection diagram. 101.102... Line switching device, 103.104.
... Information processing device, 105.106 ... Control unit of line switching device, 107.108 ... Communication control device, 109
．． 110...process input/output control unit, 111.11
2... Process input/output control device. Patent Applicant NEC Corporation 7: +'-7,X Agent Patent Attorney Naotaka Ide) Line switching time chart Figure 2

Claims (1)

[Claims] (1) A control method for a line switching device, characterized in that a standard modem interface is provided in the line switching device, and a communication control device of an information processing device controls this standard modem interface to perform line switching. .