JPS62286339A - Communication line switching system for information processor - Google Patents

Abstract

PURPOSE:To improve the reliability of an entire system and to prevent the in operation of the system by adding a line switch between a communication line and an information processor (or communication processor) being the component of a system transmitting/receiving information via the communication line. CONSTITUTION:If the communication line 20 is faulty, a line fault supervisory section 11 detects and line fault by the intermission of a carrier or the like from the line 20, informs a communication disable signal to an information processor Ala via a communication disable signal line 17 to instruct the stop of communication and informs an exchange line connection instruction signal to an exchange line connection section 12 via an exchange line connection instruction signal line 15. An exchange line connection section 12 starts the connection of an exchange line 30 according to the exchange connection procedure of a public line exchange data network 40 connected to the line 30. In completing the connection of the line 30 by the section 12, a changeover switch section 13 is thrown to the position shown in broken lines by using a switch changeover signal via a switch changeover signal line 16, a communication enable signal is informed to the information processor Ala via a communication enable signal line 78 to instruct the restart of communication.

Description

[Detailed Description of the Invention] Detailed Description of the Invention [Industrial Application Field] The present invention relates to a communication line switching method for an information processing device, and particularly to a communication line switching method when a failure occurs in the communication line [Prior Art] Regarding the connection method between the information processing device (or communication processing device) and the communication line, only the communication line that is constantly used is connected to the information processing device (or communication processing device), and no backup line is connected. Or, multiple communication lines are always connected and a backup line is secured. .

[Problems to be Solved by the Invention] In the above-described conventional connection method between an information processing device (or communication processing device) and a communication line, if a backup line is not provided, the reliability of the entire system is low and the communication line is This has the disadvantage that there is a risk that the entire system may become inoperable due to a failure. Furthermore, when having multiple communication lines, the lines must be secured at all times, which has the disadvantage of increasing system maintenance costs.

[Means for Solving the Problems] 1 The switching method between an information processing device and a communication line according to the present invention is a method for switching between an information processing device and a communication line in a system in which information processing devices exchange information with each other via a communication line. The line switching device includes a line switching device connected in series with the processing device, and the line switching device includes a line fault monitoring unit that detects a fault in the communication line, a switched line connection unit that connects to the switched line, and a switched line switching unit that connects the communication line to the switched line. and a changeover switch unit that switches between the exchange line and the exchange line, and switches the connection of the information processing device to the exchange line when the communication line fails.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of the line switching device in FIG.

In this embodiment, information processing apparatus A1. A line switching device 10 is connected between the information processing device B 1 b and the communication line 20 via an information input/output line 23, and an information input/output line 2. via the line switching device 10
are connected to each line switching device 10, and a switched line 30 is connected to each line switching device 10 using a line in a public switched data network 40 as a backup.

Further, the line switching device 10 in this embodiment is a communication line 20
a line fault monitoring unit 11° that detects a fault in the switched line 3;
0, and the line failure monitoring unit 1.
1 communication line 20. and the switched line 30 . via the switched line connection section 12 . and a changeover switch unit 13 that is switched between the two and connected to the information processing device A1a via the information input/output line 2a.

Next, the dynamic flE of this embodiment will be explained. Usually, information processing device A1. The information sent and received by the communication line 20. is the communication line 20. if there is no fault in the communication line 20. Line switching device 10. This is done via the information input/output line 23. At this time, line switching device 1
The switching switch section 13 in 0 is in the state shown by the solid line.

Now, if the communication line 20 becomes a failure, the line failure monitoring unit 11
detects a line failure due to a carrier disconnection or the like in the communication line 20, and sends a communication impossible signal via the communication impossible signal line 17 to the information processing device A1. At the same time, a switched line connection instruction signal is sent to the switched line connection section 12 via the switched line connection instruction signal line 153. The switched line connection unit 12 starts connecting the switched line 30 according to the exchange connection procedure of the public switched data network 40 to which the switched line 30 is connected. When the switched line connection unit 12 terminates the connection of the switched line 30, the switched line connection unit 12 sends a switch switching signal via the switch switching signal line 16 to change over the switching unit], 3f! : The state is set as shown by the branch line, and a communication enable signal is notified to the information processing device A1a via the communication enable signal line 18 to instruct the information processing device A1a to resume communication.

In this way, by switching the line connection from the communication line 20 to the exchange line 30/\, the information processing apparatus Al.

The information input/output line 281 line switching device 10. Exchange line 3
Communication can be restarted by inputting 0.

The communication processing device can also be switched to a switched line in the event of a communication line failure using the line switching device of this embodiment in the same manner as described above.

[Effects of the Invention "1] As explained above, the present invention provides a method for adding a line switching device 3 between an information processing device (or communication processing device) constituting a system for sending and receiving information via a communication line and a communication line. This has the effect of improving the reliability of the entire system, preventing system outages, and reducing system maintenance costs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of the line switching device in FIG. 11. 1-, lb- Information processing devices A, B, 2a , 2. ,... Information input/output line, 10... Line switching device, 11 - Line fault monitoring section, 12... Switched line connection section, 13... Changeover switch section, 15... Switched line connection instruction signal line , 16
... Switch switching signal line, 17... Communication enable signal line,
18...Communicable signal line, 20...Communication line, 30...
- Switched line, 40...Public switched data network. ■Patent attorney Susumu Uchihara

Claims (1)

[Claims] A system in which information processing devices exchange information with each other via a communication line includes a line switching device connected in series between the communication line and the information processing device, and the line switching device It includes a line failure monitoring unit that detects a failure, a switched line connection unit that connects to a switched line, and a changeover switch unit that switches between the communication line and the exchanged line, and transmits the information to the switched line in the event of a failure of the communication line. A communication line switching method for an information processing device characterized by switching connections between processing devices.