JPS6184134A - Line switching system - Google Patents

Abstract

PURPOSE:To obtain an inexpensive line switching system by allowing the center to switch a faulty private data line into a backup subscriber telephone line and using a voice synthesis output circuit to call a terminal device when the private data line connecting the center device and the terminal device is faulty. CONSTITUTION:A modulator-demodulator 3 of the center device 1 is connected normally to a modulator-demodulator 5 and a data communication terminal device 6 via the private data line 8 and a contact (a) of a changeover switch SW12 of the terminal device 2. If communication is interrupted due to a fault of the line 8, the device 1 transmits telephone number information of a subscriber telephone set 10 of the device 2 from a switch control circuit 13 to a network control circuit 14 via a backup subscriber line 9. When the telephone set 10 responds to a call and the circuit 14 detects an incoming response, a detected output is transmitted to the circuit 13. The circuit 13 switches a contact of a relay 16 to the position (b) to start a voice synthesis output circuit 17 and an operation command of the SW12 is transmitted to a responding personnel of the telephone set 10. The responding personnel of the telephone set 10 throws the SW12 to the contact (b) and a simple type network controller 11 is thrown to the switch contact (b).

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a modem system in which a modem on the center equipment side and a modem on the terminal equipment side are connected to each other via a data line. The present invention relates to a line switching method for switching the connection of modem equipment on the center equipment side and the terminal equipment side to a punctured amplifier line in the event of a failure.

[Conventional technology]

Conventionally, in this type of line switching system, when switching the connection of the modem on the terminal equipment side from the current data line to the puncture amplifier line, the data line connecting the center equipment side and the terminal equipment side is Another method used is to use another independent control line and perform switching control via this control line.

[Problems to be solved]

According to such a conventional switching control method, since a control line is separately provided, the efficiency of line utilization is reduced, and therefore, the economical efficiency is also poor.

Furthermore, the terminal device side receives a switching control signal sent from the center device via the control line, and controls switching of the connection of the terminal device side modem from the current data line to the bank-up line. In general, this type of modem system has a large number of terminal devices, and installing a switching control device on the terminal device side requires complicated and expensive equipment on the terminal device side. There was a problem.

[Means for solving problems]

The present invention solves the above-mentioned problems and allows the subscriber telephone line to be used when a failure occurs in the dedicated data line that connects the modem on the center equipment side and the modem on the terminal equipment side. In the line switching system for pack amplification, the center equipment side is provided with a switching control circuit, a network control circuit, a switching relay, and a voice synthesis output circuit, and the terminal equipment side is provided with a bank amplifier subscriber telephone and a simple A network control device and a changeover switch are provided, and the center device automatically makes a call to the subscriber telephone for puncture amplifier, and the person who answers the call operates the changeover switch from the voice synthesis output circuit. The person then operates a changeover switch, places the subscriber telephone set on the simplified network control device, and switches the contacts, thereby converting the dedicated data line into the backup subscriber telephone line. This feature is characterized by switching to .

〔Example〕

Next, an example thereof will be explained with reference to FIG.

FIG. 1 is a block diagram of an example of a modulation/demodulation system to which an embodiment of the line switching method according to the present invention is applied.

In the figure, the modulation/demodulation system includes a modulation/demodulation device 3, a communication control device 4, and a switching control device 7 included in the center equipment 1 side, a modulation/demodulation device 5, a data communication terminal device 6, and a subscriber telephone 10° included in the terminal device 2 side. It consists of a simplified network control device 11, a changeover switch 12, a dedicated data line 8 that interconnects the center device 1 side and the terminal device 2 side, and a subscriber telephone line 9 for the pack amplifier. The switching control device 7, which is the main part of the present invention,
Switching control circuit 13, network control circuit L4, switching relay 15
, 16, and a speech synthesis output circuit 17.

Now, in normal times, the modem 3 of the center equipment side
Ha, switch! It is connected to the dedicated data line 8 via the contact a' of the JV-15, and further connected to the contact a of the changeover switch L2 on the terminal device side 2 via the dedicated data line 8,
It is connected to the modem 5 via a changeover switch L2.

For example, suppose that data communication between the communication control device 4 on the center device l side and the data communication terminal equipment f6 on the terminal device 2 side is interrupted due to a malfunction of the dedicated data line 8. Then, on the center device l side, the switching control circuit 13
The telephone number information of the backup subscriber telephone set 10 on the terminal device 2 side is sent to the network control circuit 14 to start making a call.

When the handset of the pack amplifier subscriber telephone 10 is picked up on the terminal device side 2 in response to the above-mentioned call, the network control circuit [4 on the center device 1 side] detects an incoming call response. Then, this detection output is sent to the switching control circuit [3, and the switching control circuit L3 switches the contact of the switching relay 16 to the b side. As a result, the voice synthesis output circuit 17 is activated, and the voice synthesis output circuit 17 sends a voice command to operate the changeover switch [2] to the bank amplifier joining line 9.

On the terminal device side 2, the person who picks up the handset of the subscriber telephone IO switches the changeover switch L2 to the contact side according to the operation instruction message, and places the handset of the subscriber telephone 10 on the simple network control device 11. As a result, the switching contact of the simple network control device 11 is connected to the b side.

At this time, on the center device 1 side, the changeover switch [2
After sending out the operation instruction message, the switching control circuit 13 stops the voice synthesis output circuit 17, switches the contacts of the switching relay 16 to the a side, and switches the contacts t-b of the switching relay 15.
Switch to the side.

In this way, the modem 3 on the center device 1 side and the modem 5 on the terminal device 2 side are connected via the bank-up subscriber telephone line 9.

〔Effect of the invention〕

As explained above, the present invention provides means for automatically calling a preset backup subscriber telephone set on the terminal device side and instructing operation of a changeover switch on the terminal device side by a voice message on the remote control device side; Since the terminal side is configured to include means for switching and connecting the modem from the current data line to the subscriber telephone line for bank-up, there is no need to provide a control line for transmitting switching control information. This has the advantage of improving line utilization efficiency, eliminating the need for a special switching control device on the terminal device side, and realizing a simple and low-cost line switching system.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an example of a modulation/demodulation system to which an embodiment of the line switching system according to the present invention is applied. Engineering: Center device 2: Terminal device 3.5...
・Modulator/demodulator 4...Communication control device 6...Data communication terminal device 7...Switching control system device 8...Dedicated data line 9...Backup subscription '4 Talk line 16...Subscription Telephone 11... Simple network control device 12... Changeover switch [3... Changeover control circuit [4... Network control circuit 15, 16-... Changeover relay 17...]
Speech synthesis output circuit

Claims (1)

[Claims] When a failure occurs in the dedicated data line that connects the modem on the center equipment side and the modem on the terminal equipment side, switching control is performed on the center equipment side in a line switching method that uses the subscriber telephone line for backup. A circuit, a network control circuit, a switching relay, and a voice synthesis output circuit are provided,
and a terminal device side is provided with a backup subscriber telephone, a simple network control device, and a changeover switch, and the center device side automatically makes a call to the backup subscriber telephone,
To the person who answered the call, from the voice synthesis output circuit,
A command message to operate the changeover switch is sent, the person operates the changeover switch, and the subscriber telephone is placed in the simplified network control device and its contacts are changed, thereby connecting the dedicated data line to the A line switching method characterized by switching to a backup subscriber telephone line.