JPS6359224A - Line switching device - Google Patents

Abstract

PURPOSE:To obtain equal high reliability with far less maintenance cost in comparison with the assurance of a standby line through the provision of plural private lines at all times by switching an active line into a standby line if a fault takes place and switching back again from the standby line to an active line when the fault is restored. CONSTITUTION:If the active line 3 is faulty, a line fault supervisory section 12 detects a line fault such as line open or carrier interruption, sends a communication disable signal 21 to an information processor 1 to instruct the stop of communication and sends a standby line connection instruction signal 22 to a standby line connection section 13. The section 13 starts line connection according to the exchange connection procedure of a public exchange network decided to the standby line 4, sends a switch changeover signal (A B) to a changeover switch 11 when the connection is finished to changeover the point from the A to the B position. Then the section 12 detects the restoration of the fault of the active line 3, then the section 12 sends a communication enable signal 24 to the information processor 1 via an OR circuit 15 to instruct the start of communication.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is an information processing system that transmits and receives information via a communication line.
The present invention relates to a line switching device for avoiding the influence of a communication line failure in an information processing system including a ct+ communication processing device or the like.

(Prior Art) Conventionally, in the event of a failure in the communication line of this type of information processing system, either no backup line is provided, or multiple dedicated lines are prepared to provide a backup line. All are secured.

(Problems to be Solved by the Invention) In the conventional information processing system described above, the backup port NMft
In a system without this, the reliability of the entire information processing system is low, and failures in communication lines have the disadvantage that the operating wh rate of the entire system is greatly reduced.

In addition, when having a plurality of dedicated IT backup lines, it is necessary to keep unused lines at all times, which has the disadvantage of increasing maintenance costs for the information processing system.

The purpose of the present invention is to eliminate this further drawback and to secure a backup line only when the normally used line is out of order. An object of the present invention is to provide a line switching device for increasing overall reliability.

(Means for Solving the Problems) In order to achieve the above object, the line switching device according to the present invention is a device that performs all information exchange via a communication line.
A circuit monitoring unit (12) that detects a failure in the normally used communication line (3), and a backup line that automatically connects to a backup line (4) when a failure occurs in the communication line (3). When the line connection part (13) and the communication line (3) are recovered from a fault, the backup line +f+1 (4) is automatically disconnected and the communication line (3) is automatically disconnected.
], and control of the protection line disconnection unit (14), the protection line connection unit (13), and the protection line disconnection unit (14)
Money receiver, normally used communication time m(3) and reserve time &
(14) and a switching means (11) connected to the device (1) for transmitting and receiving information via a communication line.

(Actual flow side) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a line switching device according to the present invention.

There are information processing devices, communication processing devices, etc. as devices that transmit and receive information by switching all communication lines, and FIG. 1 shows a line switching device 10 that switches the line connected to the information processing device 1.

As shown in the figure, a line switching device 10 of this embodiment is connected to an information processing device 1 via an information input/output line 2. It is also connected to a normally used communication line (hereinafter referred to as a working line) 3 and a protection line 4 that is used as a line such as a public circuit switched data network or a public packet switched data network.

The line switching device 10 of this embodiment includes a changeover switch 11 as a connection switching means for switching and connecting the working line 3 and the protection line 4, and a line fault monitoring unit 12 for monitoring the presence or absence of a fault in the working line 3. , a protection line connection section 13 that connects the protection line 4 according to its exchange connection procedure and sends a switching signal to the changeover switch 11; and a protection line disconnection unit that disconnects the protection line 4 according to its disconnection procedure and sends a switching signal to the changeover switch 11. Section 14 is included.

Next, the operation of this embodiment will be explained.

When a failure occurs in the working line 3, the line failure monitoring unit 12 detects a line failure such as an incoming line disconnection or a carrier disconnection, and issues a communication failure signal 2.
1t-Information processing bag [1] to instruct all communications to be stopped, and also sends a backup line connection instruction signal 22 to the backup line connection unit 1.
Send to 3. The protection line connection unit 13 starts line connection according to the exchange connection procedure of the public switched network established for the protection line 4, and when the connection is completed, sends a switch change signal (A-
+B)235! - Send it to the changeover switch 11 and switch its contact from the input side to the B side.

At the same time, the communication enable signal 24i is sent to the information processing device 1 via the OR circuit 15 to instruct the start of communication. In this way, the line connection to the information processing device 1 is established through the working line 3.
switch to backup line 4.

Thereafter, when the line fault monitoring unit 12 detects recovery from the fault in the working line 3, it sends a communication disable signal 21 to the information processing device 1, instructing the information processing device 1 to stop all communications, and sends a protection line disconnection instruction signal 25 to the protection line disconnection unit. Send to 14th. Preliminary line disconnection section 1
4 starts line disconnection according to the public switched network disconnection procedure established for the protection line 4, and when the disconnection is completed, sends a switch changeover signal (B→A) 26 to the changeover switch 11, and its contact = iB side. Switch from to the input side. At the same time, the communication enable signal 24 is sent to the information processing device 1 via the OR circuit 15 to instruct the start of communication. In this way, the line connection to the information processing device 1 is switched from the protection line 4 to the working line.

(Effects of the Invention) As explained above, the present invention can be added to an information processing device or a communication processing device constituting an information processing system that sends and receives information via a trace (G line), and monitors line failures and When a problem occurs, the working line is switched to the protection line, and when the fault is recovered, the protection line is switched back to the working line. By doing so, the public switched data network can be used only when there is a fault in the normally used line. Because it uses lines such as those from private networks or public packet-switched data networks as backup lines, it is said that the same level of reliability can be achieved at far lower maintenance costs than the conventional method of always having multiple dedicated lines to secure backup lines. effective.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment according to the present invention. 1... Information processing if 2... Information input/output line 3
... Working circuit name 4 ... Protection line 10 ... Line switching device 11 ... Changeover switch 12 ... Line fault monitoring section 13 ... Protection line connection section 14 ... Protection line switching section 15 ...OR circuit 2
1... Communication unavailable signal 22... Protection line connection instruction signal 23... Switch switching signal (A-+B) 24...
Communication available signal

Claims (1)

[Claims] A device that sends and receives information via a communication line includes a line failure monitoring unit that detects a failure in the normally used communication line, and a backup line that automatically establishes a backup line when the normally used communication line fails. a backup line connection unit that performs an exchange connection to the communication line; a backup line disconnection unit that automatically disconnects the protection line and connects to the communication line when a failure in the communication line is recovered; and a protection line connection unit that automatically disconnects the protection line and connects to the communication line. and switching means that is controlled by the backup line disconnection unit and switches between the normally used communication line and the backup line to connect to a device that sends and receives information via the communication line. Line switching equipment.