JPS61274557A - Remote control system - Google Patents

Abstract

PURPOSE:To attain the output of an independent message produced from an exchange device by transmitting a signal to a changeover switch when the abnormality of a typewriter under a connection state is detected by the exchange device and switching the faulty typewriter to another nondefective one. CONSTITUTION:An exchange device 1 is connected to a typewriter 3 at a maintenance office. If the device 1 detects a trouble of the typewriter 3, the device 1 actuates a typewriter circuit switch indicating relay 4 for a fixed period of time. Thus a relay switch 6 self-holds its operation. If a trouble of a typewriter 2 at an unmanned office is detected in a connection state of the typewriter 2, a relay 5 is actuated for a fixed period of time. Thus the switch 6 is restored after its self-holding circuit is cut off at a contact of a switch 10. In such a way, the changeover is possible between both typewriters 2 and 3 through contacts of switches 14 and 15 on a typewriter communication circuit by controlling the actuation and restoration of the switch 6. Then an independent message produced from the device 1 can be delivered during a faulty mode of a typewriter.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a remote control method for remotely maintaining telephone exchanges installed in central offices where there are no maintenance personnel using interoffice signals, and is particularly applicable to unmanned stations and maintenance stations. The present invention relates to a remote control method for controlling the switching of communication lines for each installed typewriter.

[Conventional technology]

Conventionally, in this type of remote control method, a changeover switch is installed in the communication line between the unmanned station switching device and the unmanned station typewriter, and the switching device and the unmanned station typewriter are connected by manually operating and restoring the changeover switch. It was a method to connect typewriters at maintenance stations.

[Problems to be solved]

In the conventional remote control method described above, the switching device of the unmanned station and the typewriter of the maintenance station are connected during normal operation.In this case, if a failure occurs in the typewriter of the maintenance station, the switching device detects the above typewriter failure and transfers the failure information to the maintenance station, and from then on until the maintenance person switches the maintenance station typewriter line to the unmanned station typewriter line, the maintenance personnel detected by the unmanned station switching equipment The disadvantage is that information important for maintenance of the unmanned exchange system cannot be detected because independent messages are not output to the person.

[Problems to be solved]

The present invention provides a changeover switch in the communication line between the unmanned station switching device and the unmanned station typewriter, and manually instructs to switch the changeover switch to either the maintenance station typewriter or the unmanned station typewriter. In a remote control method that uses switching communication lines, if an abnormality is detected in the currently connected typewriter by the unmanned station switching device, the maintenance station typewriter line is switched from the switching device to the unmanned station typewriter side (or its By using a remote control system that sends a signal for switching to the reverse) to the changeover switch, the above-mentioned conventional problems are solved, and the typewriter connected to the switching device is automatically switched.

〔Example〕

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

FIG. 1 shows an embodiment of the present invention. Since the typewriter communication line switching relay switch 6 is not operating in normal times, the contacts of the switches 14 and 15 are used to connect the exchange device 1 and the maintenance station typewriter 3. is connected. If a maintenance person switches to the unmanned station typewriter 2 in this state, the relay switch 6 of the unmanned station will be activated by operating the electrician 13 at the maintenance station, and by operating the electrician 8 at the unmanned station. However, it is self-maintained by the contact of switch 7. Similarly, when returning to the maintenance station typewriter 3, the above-mentioned relay switch 6 switches the self-holding circuit to the electric key 12 or 1 by operating the electric key 12 or 11.
1, it will be disconnected and restored.

Next, if the exchange device 1 and the maintenance station typewriter 3 are connected, the exchange device 1 connects the maintenance station typewriter 3 to the maintenance station typewriter 3.
When a failure is detected, the switching device 1 operates the typewriter line switching instruction relay 4 for a certain period of time so that the Ij fly switch 6 maintains its operation, and also, while connected to the unmanned station typewriter 2, the typewriter When a failure of No. 2 is detected, by operating the relay 5 for a certain period of time, the relay switch 6 disconnects the self-holding circuit at the contact point of the switch 10 and recovers. By performing the above-mentioned communication, operation of the relay switch 6, and recovery control, switching between the maintenance station typewriter 3 and the unmanned station typewriter 2 is performed using the contacts of the switches 14 and 15 on the typewriter communication line.

〔Effect of the invention〕

As explained above, according to the present invention, when the switching device detects a fault in the currently connected typewriter, the switching device sends an instruction signal to switch to the other typewriter line, disconnects the faulty typewriter, and connects the other typewriter to the other typewriter. By connecting it to a writer, it is possible to independently output messages and messages generated by the exchange device during a typewriter failure.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a remote control system according to an embodiment of the present invention.

Claims (1)

[Claims] By installing a changeover switch on the communication line between the unmanned station switching device and the unmanned station typewriter, and manually instructing the changeover switch, the communication line can be connected to either the maintenance station typewriter or the unmanned station typewriter. In the remote control method that is used by switching, when the switching device of the unmanned station detects an abnormality in the currently connected typewriter, the switching device sends a switching control signal to the changeover switch to switch the typewriter to the other typewriter. A remote control method characterized by switching to