JPS62136155A - Redundancy device for subscriber's circuit - Google Patents

Abstract

PURPOSE:To offer normal talking and exchange services to subscribers without giving any trouble to the subscribers when continuation of talking becomes impossible, by switching a line circuit to a stanby line circuit by means of a command from a central controller when the line circuit becomes faulty. CONSTITUTION:When a line circuit LC1 connected with a subscriber's telephone set A1 becomes faulty for some reason while talking with another subscriber's telephone set An and a talking-impossible state is set or the service of an automatic telephone exchange becomes impossible to be used, a central control unit 5 sends switching control information to a standby line circuit 8 to a subscriber's circuit redundancy device 3. A change-over relay controlling circuit 7 actuates the standby line circuit 8 and the control unit 4 disconnects the link (1) between the subscriber's circuits LC1 and LCn and connects the link (2) between the standby line circuit 8 and subscriber's circuit LCn.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an extension connection processing device for an automatic telephone exchange.
In particular, the present invention relates to a subscriber circuit redundancy device for dealing with a subscriber circuit failure during a call.

(Prior art) Conventionally, this type of processing device has been designed to display a warning on an external alarm display or block the existing circuit if a failure occurs for some reason in the subscriber's circuit during a call with an extension. This was the only option available, and the subsequent steps were not taken care of.

(Problems to be Solved by the Invention) As mentioned above, in the conventional extension connection processing device, as a post-processing in the event of a subscriber circuit failure, the extension connection processing device connects the subscriber to the line circuit until the existing subscriber circuit is repaired by a maintenance person. There was the inconvenience of not being able to use the system, and the problem was that it lacked urgency.

The purpose of the present invention is to automatically switch and connect to a backup line circuit when an extension subscriber who is on a call encounters a failure in the subscriber circuit for some reason, without waiting for a maintenance person to repair the subscriber circuit. An object of the present invention is to provide a subscriber circuit redundancy device that allows a normal call to continue without disconnecting the line during the call.

(Means for Solving the Problems) A subscriber circuit redundancy device according to the present invention includes a backup line circuit switching relay connected between a subscriber circuit of an automatic telephone exchange and a single terminal, and a switching relay control relay. circuit, and an interface circuit with a central control device, and the backup line circuit switching relay is configured to switch the line circuit to a backup line circuit in response to a command from the central control device when a line circuit of the terminal telephone in question is abnormal. This is what I did.

(Example) Next, one embodiment of the present invention will be explained with reference to the drawings.

The drawing is a circuit diagram of a telephone relay system in an embodiment of the present invention. In this figure, Al to An indicate subscriber telephones,
2 is a main distribution board, and 3 is a subscriber circuit redundancy device according to the present invention. LCI to LcnVi are subscriber circuits corresponding to subscriber telephones Al-An, respectively. 4 is a time division switch, 5 is a central control unit, and 6 is a subscriber circuit redundancy device 3'F - an interface circuit for the attached central control unit 5. r11 to rln are subscriber telephones Al
-An and the subscriber circuits LC1 to LCn are connected to each other by a line circuit switching relay, and 7 is a control circuit for the line circuit switching relay. 8 is a spare line circuit.

In this embodiment, for example, during a call between subscriber telephones A1 and An, the line circuit LC to which the telephones AIVC is connected becomes impaired for some reason, making it impossible to make a call or the service of the automatic language exchange becomes unavailable. In this case, the LCl sends alarm information to the central controller 5V'C indicating a call-disabled state.

The central controller 5 constantly monitors the alarm information of the line circuits LCI-r and cn, and when it receives alarm information from the faulty line circuit LC1, it detects and judges it, and deploys it to the subscriber circuit redundancy device 3. The switching control information to the backup line circuit 8 is sent to the backup line circuit 8.

When the subscriber circuit redundancy device 3 receives this information via the interface circuit 6, it transfers it to the switching relay control circuit 7. This is developed in the switching relay control circuit 7 to drive the line circuit switching relay rlh in the control circuit, and its contact is turned on, thereby starting the backup line circuit 8. At the same time that the backup line circuit 8 is activated, the central control unit 5 disconnects the link (2) between the subscriber circuits LC1 and LCn, and disconnects the link (2) between the backup line circuit 8 and the subscriber circuit LCn.
Connect the link ■. Note that when the backup line circuit 8 is in use, connections to other subscriber circuits are not formed;
The contacts of the line circuit switching relay are also designed so that two sets of VCs will not be turned on at the same time by the control circuit 7Vc. In this way, go to the original subscriber's phone@ via the backup line circuit! I can continue talking with and An.

(Effects of the Invention) As explained above, the present invention, when a subscriber's circuit during a call encounters some kind of failure and becomes unable to continue the call, does not temporarily interrupt the call and wait for the existing subscriber's circuit to be repaired. By automatically switching and connecting the spare line circuit,
The effect is that normal telephone and exchange services can be carried out without causing any harm to subscribers.

[Brief explanation of drawings]

The drawing is a circuit diagram of a telephone relay system according to an embodiment of the invention. 2... Main distribution board, 3... Subscriber circuit redundancy device. 4°...Time division switch, 5...Central control unit, 6...
...Interface circuit, 7. Switching relay control circuit, 8. Reserve line circuit, A1-An.. subscriber telephone. LC1 to LCn... subscriber circuit, rAtlzrln... subscriber circuit switching relay.

Claims (1)

[Claims] A backup line circuit switching relay connected between a subscriber circuit of an automatic telephone exchange and a terminal telephone, a switching relay control circuit, and an interface circuit with a central control device, the backup line circuit switching relay comprising: A subscriber circuit redundancy device characterized in that when a line circuit of a corresponding terminal telephone is abnormal, the line circuit is switched to a backup line circuit by a command from the central control device.