JPH04118733A - Automatic terminal backup system by duplexing terminal controller - Google Patents

Abstract

PURPOSE:To execute the automatic backup of terminals by constituting the system of two sets of terminal controllers, plural sets of terminals and a local area network to which each of them is connected. CONSTITUTION:Two sets of terminal controllers 2-1. 2-2 establish a session connection with (n) sets of terminals 3-l - 3-n, respectively, and also, between the terminal controls 2-1, 2-2 and terminals of half of (n) sets, an application connection is established, respectively. In such a state, for instance, when the terminal controller 2-1 is at fault, the terminal controller 2-2 detects the fault of the terminal controller 2-1 after a prescribed time, and the terminal controller 2-2 transmits switching instruction data to the own terminal controller through a session connection with respect to the terminal of the terminal controller 2-1 group, and an application connection is established. In such a way, an automatic backup can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic terminal backup system using duplex terminal control devices, and more particularly to an automatic terminal backup system using duplex terminal control devices.

[Conventional technology]

Conventionally, a terminal could be connected to a terminal controller 55 through only one transmission path as shown in FIG. 2, so one terminal controller 22 could connect multiple terminals to one
:n connection via the line switching device 26 and line adapter 27.

In addition, as a countermeasure against a failure of the terminal control device 22, by increasing the number of terminal control devices 22 to two, the terminals can be distributed and connected under each terminal control device, or in the event of a failure of the terminal control device, the operator However, the terminal 23 was connected to another terminal control device 22 using the line switching bag N26 for backup.

[Problem to be solved by the invention]

In the conventional terminal connection configuration described above, when a terminal control device fails, all terminals under that terminal control device become available for use, or the operator uses a line switching device to switch the terminals that have become available for use to other terminals. An operation was occurring to change the connection to the control device. Furthermore, in addition to the line switching device, a large amount of line adapters for the terminal control device were required as hardware.

[Means to solve the problem]

The automatic terminal backup system of the present invention includes two terminal control devices, a plurality of terminals, and a local area network to which each terminal is connected.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows an embodiment of the invention. In FIG. 1, one embodiment of the present invention includes a host 1, a terminal control device 2 (2
-1,2-2)Terminal 3 (3-1,3-n>LAN (
A local area network) 4, and a LAN adapter 5. The host 1 has the function of connecting the terminal control device 2, processing tasks input from the terminal 3, and outputting the results to the terminal 3. The terminal control device 2 connects the terminal 3 via the LAN 4, It has the function of controlling communication with 3, as well as relaying data sent and received between a host and a terminal, converting formats, etc. The terminal 3 has a function of performing input/output processing for business operations. L
The AN4 is a high-speed transmission line between the two terminal control devices 2 and the plurality of terminals 3, and is a branch type network. The LAN adapter 5 is required when connecting to the LAN 4.

This is a built-in package of the terminal control device 2 and the terminal 3.

The terminal automatic backup system configured by these will be explained below. It is assumed that the host 1, terminal control bag W2, and terminal 3 are all started up normally. Each of the two terminal control devices 2-1.22 controls n terminals 3.
-1 to 3-n, and conversely, each of the n terminals 3-1 to B-n has two terminal control devices #1. A session connection has been established with #2.

Furthermore, between the terminal control device 2-1 and half of the n terminals (referred to as terminals in the terminal control device 2-1 group), the terminal control device 2-2 and the remaining half of the terminals (terminal control device 2 −
An application connection has been established with two groups of terminals (referred to as two groups of terminals), and the terminal 3 sends and receives data to and from the host through this application connection.

Furthermore, the two terminal control devices 2-1 and 2-2 monitor each other for failures. For example, terminal control device 2
-1 becomes a failure, after a certain period of time, terminal control device 2-
2 detects a failure in the terminal control device 2-1. The terminal control value 2-2 transmits switching instruction data to the own terminal control device through the session connection to the terminals in the terminal control device 2-1 group, and establishes an application connection. Thereafter, the terminals in the terminal control device 2-1 group can transmit and receive data with the host 1 via the terminal control device 2-2.

〔Effect of the invention〕

As explained above, the present invention enables other terminal control devices to automatically back up all terminals under the terminal control device in the event of a failure of the terminal control device. , instead of a line adapter, only one LAN adapter is required for each terminal control device and terminal.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional system. 1... Host, 2 (2-1, 2-2>... Terminal control device, 3 (3-1, 3-n)... Terminal, 4-L
AN (local area network), 5...LA
N adapter.

Claims (1)

[Claims] An automatic terminal backup system that includes two terminal control devices, multiple terminals, and a local area network to which each terminal is connected.