JPH02217060A - Communication line switching system - Google Patents

Abstract

PURPOSE:To quickly switch private lines to public lines when line faults are generated in plural lines by referring the priority order of lines stored in a center side dialing backup equipment and switching the lines so that the dialing of the line with the highest priority level is backed up. CONSTITUTION:The center side dialing backup equipment 20 has a line fault detecting part 6 for detecting the line fault of a private line, a line selecting part 3 for switching lines from center side demodulators 1, 2 from private lines 4, 5 to public lines 10, 12, 13, a network control part 7 for calling from the public lines, a control part 9 for controlling respective parts, and a priority order storing part 8 for storing the priority order of the lines. On the other hand, remote side MODEMs 14, 15 have line switching parts 16, 17 for switching the lines from the private lines to the public lines based on incoming calls. When line faults are generated in plural lines, the line with the highest priority level can be automatically switched from the private line to the public line and time required from the generaton of the line faults up the completion of line switching can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a communication line switching system for switching a communication line between after-meal preparation devices from a dedicated line to a public line.

[Conventional technology]

Conventionally, multiple center-side modems were connected to one remote-side modem each via a dedicated line for communication, and the center-side dial backup device was connected to the public line network for dial backup. The remote modem is connected to the public line network by one line, and each remote modem is connected to the public line network by one line. If a line failure occurs on multiple lines, a person must decide which line should be switched from a private line to a public line and perform the switching operation.

[Problem to be solved by the invention]

In the conventional communication line switching method described above, if a line failure occurs on multiple lines, a person must decide which line to switch from the private line to the public line and perform the switching operation. The disadvantage is that it takes time to complete the switching.

[Means to solve the problem]

The communication line switching system according to the present invention includes a line failure detection section for detecting a line failure of a dedicated line in a center-side dial backup device, and a line selection unit for switching a line from a center-side modem/demodulator from a dedicated line to a public line. a network control unit for making calls from public lines, a control unit for controlling these, and a priority storage unit for storing line priorities. It has a line switching unit that switches the line from a private line to a public line.

[Effect]

This invention automatically switches a preset high priority line from a leased line to a public line when a line failure occurs on a plurality of lines, and can do so in a short time.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a communication line switching system according to the present invention. In the figure, 1 and 2 are center feed adjustment devices, 3 are movable contacts 3a and 3b,
First fixed contacts 3c and 3d.

A line selection section that includes second fixed contacts 3e and 3f and switches the lines from the center side modem 1 and 2 from a dedicated line to a public line, 4 and 5 are dedicated lines, and 6 is a line failure of the dedicated lines 4 and 5. 7 is a network control unit that makes a call to the following remote modem via the public line; 8 is a priority memory that stores line priorities; 9 is a control unit that controls the line selection unit 3, the network control unit 7 and the priority storage unit 8; 10 is a public line; 11 is a public network; 12 and 13 are public lines; 14 and 15 are lines, respectively. Switching units 16 and 17. This is a remote modem device equipped with modem sections 18 and 19.

20 is the line selection section 32, line failure detection section 6.
Network control unit 7. The center-side dial backup device 20. is composed of a priority storage section 8 and a control section 9. Remote modem 14 via dedicated line 4
, and the center side modem device 2 is connected to this center side dial backup device 20. It is connected to a remote modem 15 via a dedicated line 5.

Next, the operation of the communication line switching method with the above configuration, for example, the dedicated line 4. A line failure occurs in the dedicated line 5, and the center side modem 1 and the remote side modem 14 are connected via the public lines 10 and 12, or the center side modem 2 and the remote side modem 15 are connected via the public line 10. and 1
The case of connection via 3 will be explained. First, the public line 10 is left unconnected to the public lines 12 and 13. The line fault detection unit 6 in the center-side dial backup device 20 constantly monitors the line faults on the dedicated line 4 and the dedicated line 5, and detects when a line fault occurs on the dedicated line 4 and detects the line fault. Signal control unit 9
Output to. Therefore, the control section 9 operates in response to the input of this line failure signal, controls the network control section 7, and calls the remote modem 14. Therefore, the line switching unit 16 of the remote modem 14 switches the line from the dedicated line 4 to the public line 12 upon receipt of the call. Similarly, the control section 9
detects an incoming call from the remote modem 14 using a signal from the network control unit 7, controls the line selection unit 3, and connects the movable contact 3.
a to the second fixed contact 3e. For this reason, the center side modem 1 is connected to the center side dial backup device 20.
It can be connected to the remote modem 14 via the movable contact 3a + second fixed contact 3e of the line selection unit 3 - network control unit 7 - public line 10 - public network 11 - public line 12. Thereafter, when a line failure occurs in the dedicated line 50, the line failure detection unit 6 detects this line failure and outputs a line failure signal to the control unit 9. Therefore, the control unit 9 refers to the contents of the priority storage unit 8, and if the priority of the dedicated line 4 is higher than the priority of the dedicated line 5, the public line 10 and the public line 12 are
connected f! To wear. However, when the priority of the leased line 5 is higher than the priority of the leased line 4, the control unit 9 controls the network control unit 7 to on-hook the public line 10, and the remote shuji repeating device 140 line switching unit 16 The center side dial backup device 20 detects that the public line 10 is on-hook, switches from the public line 12 to the private line 4,
The control unit 9 controls the network control unit 7 to make a call to the remote modem 15, and the line switching unit 17 switches from the private line 5 to the public line 13 when the call arrives, while also switching the call from the center side dial backup device 20. The control section 9 detects an incoming call from the remote modem 15 using a signal from the network control section 7, controls the line selection section 3, and switches the variable contact 3b to the second fixed contact 3f. For this reason, the center side modem 2
are the movable contact 3b of the line selection section 3 of the center side dial backup device 20, the second fixed contact 3f - the network control section 7-
It can be connected to the remote modem 15 via the public line 10 - public network 11 - public line 13.

〔Effect of the invention〕

As explained in detail above, according to the communication line switching system according to the present invention, a plurality of center-side modem devices each communicate with one remote-side modem device via a dedicated line. In a modem network in which a dial backup device at the center side and a modem device at the remote side are each connected to a public line by one line, if a line failure occurs on multiple lines, the high priority stored in the dial backup device at the center side The line can be automatically switched from a private line to a public line, and the time from the occurrence of a line failure to the completion of line switching can be shortened, among other effects.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a communication line switching system according to the present invention. 1 and 2...Skewer center side modulation/demodulation device, 3...Line selection unit, 4 and 5φ...Dedicated line, 6...Line fault detection unit, 7...Network control unit, 8 ...Priority storage unit, 9...Control unit, 10.12 and 13Φ.
Fist/Public line, 11...Public network, 14 and 15...
...Remote after-meal part, 16 and 17...Φ line switching part, 18 and 19, φ...Variation part, 20...
-Dial backup device on the dispute center side. Patent applicant: NEC Corporation

Claims (1)

[Claims] Multiple center-side modem devices are each connected to one remote-side modem device via dedicated lines, and the center-side dial backup device is equipped with one public line for dial backup, and two or more dedicated lines are connected to each other. A communication line switching method characterized in that when a line failure occurs, the line is switched to perform dial backup of the line with the highest priority by referring to the line priority stored in the center-side dial backup device. .