JPH02277342A - Line switching system for local area network connection terminal equipment - Google Patents

Abstract

PURPOSE:To improve the backup method of a line and to quicken the method by processing content of a line connecting to each terminal equipment and a corresponding line as a file. CONSTITUTION:A local area network is provided with terminal equipments 11-14, 21, 22 and with a central processing unit 3 as a controller and connects to a console 4. The console 4 has files X, Y and Z. When the terminal equipment 12 is faulty and desired to be switched to a standby equipment 14 and the console 4 commands the changeover of the terminal equipment 12, a state transition table file X is referenced and a new state number (12) is selected based on a present state number (1) and a terminal equipment (C) desired to be switched and given to the file Y. Plural line group files included in the file Y are extracted by using the new state number (12) as a key and a required line data in the corresponding file Z is collected. The collected data is processed as a text and sent to a line switchboard.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a local area network using optical transmission lines, and particularly to a connection switching system for fixed connection lines.

(Prior Art) Conventionally, in this type of switching system, in order to switch a single line, it was necessary to input a series of commands for line blockage, deletion, registration, and release from a console.

For example, if multiple terminal devices are connected to a local area network using this method, and there is a backup terminal device among them that can be switched in case of failure, etc.
Multiple fixed connection lines were switched by re-registering each line one by one using a series of commands as described above, or by loading a data file created in advance.

(Problems to be Solved by the Invention) In the conventional switching method described above, there are many problems at the time of switching, such as the need for several consecutive commands to switch a single line, or the need to replace files. The disadvantage is that it requires a lot of work. Therefore, in an emergency, it takes time to switch multiple lines all at once, resulting in a lack of reliability due to delays in failure recovery.

An object of the present invention is to eliminate the above-mentioned drawbacks by storing lines connected to each terminal device and the corresponding line management contents in a file, thereby improving workability and reliability of a local area network. The purpose is to provide a line switching method for connected terminals.

(Means for Solving the Problem) A line switching system for a local area network connection terminal according to the present invention is configured to include a line, a plurality of terminal devices, a central device, a console, and a plurality of terminal devices. This is what I did.

The line consists of a ring-shaped transmission path formed by an optical cable.

The plurality of terminal devices are installed in the middle of the transmission path.

The central device I is placed in the middle of the transmission path and is connected to several terminal devices via the transmission path.

The plurality of terminal devices are sub-connected in the middle of the transmission path.

The console is connected to the central device and is used to exchange information with the central device.

The console takes into account failures of terminals and lines to terminals and creates a first file for a state transition table of connected lines and a second file for a link table storing state numbers and line group numbers. , a third file for storing line numbers, addresses, and data. When switching the line due to detection of a failure, the console determines the line to be switched by searching the first to third files and instructs switching.

(actual case) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an implementation 11 of a line switching method for a local area network connection terminal according to the first invention.

In FIG. 1, 11 to 14 are terminal devices, the first to third and spare N machines, 21 and 22 are terminal devices, the first and second 4 is a console, and 51 to 53 are terminal devices.

In this embodiment, the console 4 is equipped with first to eighth files.

The first file is for storing a state transition table of connection lines, the second file is for storing a link table that stores state numbers and line group numbers in correspondence, and the second file is for storing a link table that stores state numbers and line group numbers in correspondence. File number 8 is for storing line numbers, addresses, and data.

FIG. 2 is an explanatory diagram showing an example of line switching operation according to the present invention.

In Figure 2, ■~■ are circuit group numbers, ■~■
is the switching terminal type, ■~■ are the status numbers, respectively.
The current number indicates the system status. Also, %OXXΔΔI
is the link number Φ and both end line addresses. File X represents the first file, which is a state transition table file. File Y represents a second file, which stores a plurality of line group numbers belonging to the current state, and registers the corresponding position in the file from the line database. File 2 represents the eighth file, and is used to register the round addresses at both ends of the link number belonging to the corresponding round/group.

As shown in FIG. 1, for example, if some kind of failure occurs in the second N aircraft 12 and it is desired to switch to the standby aircraft 14, the console 4 issues a command to instruct the switching of the second N aircraft 12. As shown in FIG. 2, the next state number is indexed inside the console 4 through the current state number and the state transition table file 4 from the designated terminal type. For example, the current state number ■ is searched, and the disconnection state number O due to the transition to state 4 is indexed for the terminal ■ to be switched. A plurality of line group files included therein are extracted from the state transition destination number through file Y, and necessary line data is collected from each file 2.

Converts the collected line data into text and sends instructions to the line switching equipment. In the line switching device, it is processed as a series of command signals.

(Effects of the Invention) As explained above, the present invention provides a limit on the number of lines that can be registered in memory by one command from the console by creating a file containing the lines connected to each terminal and the corresponding line management contents. You can switch fixed lines up to
This can be used to improve and speed up backup methods in the event of line or terminal failures, and has the effect of improving reliability.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a line switching system for a local area network connection terminal according to the present invention. FIG. 2 is an explanatory diagram showing an example of line switching operation according to the present invention. 11-14...N machine 21.22...-M machine 3...Central device 4...e/Console 51-53...Terminal device

Claims (1)

[Claims] A line consisting of a ring-shaped transmission line formed by an optical cable, a plurality of terminal stations installed in the middle of the transmission line, and the transmission to the plurality of terminal stations placed in the middle of the transmission line. A central device connected to the central device by a transmission path, a console connected to the central device for exchanging information with the central device, and a plurality of terminal devices connected in the middle of the transmission path. and the console monitors failures of the terminal device and the line to the terminal device, and a first file for a state transition table of a connection line, a first file for a link table storing state numbers and line group numbers. 2 and a third file storing line numbers, addresses, and data, and when switching the line upon detection of the failure, the line to be switched is determined by searching the first to third files. 1. A line switching method for a local area network connection terminal, characterized in that the method includes means for determining and instructing switching.