JPS63310227A - Channel switching equipment - Google Patents

Abstract

PURPOSE:To automatically process switching of a channel between opposed stations by only designating a switching instruction, by constituting the titled device so that a control part calls number information to a conversion network by a prescribed designation, discriminates the designation or a state of an interface circuit, and controls a changeover switch. CONSTITUTION:At the time of a fault of an exclusive channel 2, a switching designation is inputted to a control part 22, an interface circuit 24 is controlled and a call is instructed. Also, by controlling a changeover switch 26, an interface circuit 5 is switched to an interface circuit 25 of a subscriber's circuit line 7 of a switching network. The circuit 24 is connected to a calling use interface of a line terminating equipment 27, executes automatic dialing by telephone number information of the other station stored in advance in a telephone number memory 23, and executes a connection to the other station. When an incoming to the other station is detected in the circuit 25, the control part 22 controls the switch 26, and switches the circuit 5 to the interface circuit 25. Also, when a disconnection of this incoming connection is identified the switching connection of the channel is released.

Description

[Detailed Description of the Invention] [Summary] Regarding a line switching device that switches between a dedicated digital line and a backup switching line, the present invention aims to reduce the number of maintenance personnel and shorten the switching time by automating the switching operation. A line switching device having a switch section and an interface circuit for switching and connecting a side line to either a dedicated digital line or a subscriber line of a digital switching network, the line switching device having a storage means for storing a telephone number; means for generating a call to connect to a station whose telephone number is stored in the recording means of the digital switching network, and for disconnecting the connection;
6. means for controlling the transfer switch section to perform predetermined switching according to the designation, and detecting a predetermined state of the subscriber line; It is constituted by means for controlling the changeover switch section so as to perform predetermined switching according to the state.

[Industrial application field]

The present invention relates to a line switching device for switching between a dedicated digital line and a bank-up exchange line.

2. Description of the Related Art With the spread of high-speed digital lines, it has become common practice to construct communication networks using dedicated lines within companies.

In such communication networks, redundant designs are used to provide a margin for the number of dedicated lines in case a failure occurs in the dedicated line. In cases where it is extremely uneconomical to provide a margin in the number of lines in consideration of the above, or in order to increase safety by providing a backup line on a different route, a configuration in which the public communication switched network is used as a backup line in the event of a failure of the dedicated line. may be taken.

[Conventional technology]

FIG. 2 is a block diagram showing an example of the configuration of the line switching device.

A line switching device 1 connects a dedicated line 2 of a high-speed digital line having, for example, a well-known International Telegraph and Telephone Consultative Committee (CCITT) Recommendation V, 35 interface to a device-side line (hereinafter referred to as It is always connected to the interface circuit 5 of 6 (referred to as internal line).

In addition, as a protection line, the subscriber line 7 of the digital switching network is connected to a line termination equipment (DCE) having the function of a known network control equipment.
8 to an interface circuit 9. This interface is also the same v.35 interface as described above.

The other station connected to the dedicated line 2 is also connected, for example, via the line switching device 1 having the same configuration, and normally communicates using the dedicated line 2, but if a fault in the dedicated line 2 is detected. Then, the maintenance person switches the interface circuit 5 of the internal line 6 by operating the keys on the changeover switch section 4, etc.
The connection is switched from the interface circuit 3 to the interface circuit 9.

The user also operates the telephone 10 connected to the telephone interface of the DCE 8 to generate a call to the switching network, dials the telephone number of the other party, and connects to the other party via the switching network.

A maintenance person at the other station makes a meeting using the telephone 10 and operates the line switching device of his own station in the same manner as described above to switch the connection of the interface circuit, so that the internal lines 6 of both stations are connected via the switching network. connection and can maintain communication.

Even when the dedicated line 2 is restored, maintainers of both stations meet to restore the original connection by operating the respective changeover switch units 4.

[Problem that the invention seeks to solve]

According to the above-mentioned line switching device 1, maintenance personnel are present at both stations to switch the line, and it is necessary to carry out the switching operation through a meeting.In addition, it takes time and effort to switch each line, so it takes a long time before communication is resumed. The problem is that it takes time.

An object of the present invention is to provide a line switching device that can reduce the number of maintenance personnel and shorten switching time by automating switching operations.

[Means for solving problems]

FIG. 1 is a block diagram showing the configuration of the present invention.

The diagram shows internal line 6 as a dedicated line! 2 and the subscriber line 7, 22 of the line switching device 21 is a control unit, and when a predetermined designation is given, the number information held in the telephone number memory 23 is transferred to the interface. circuit 24 to make a call to the switching network, identify the state of the specified or interface circuit 25, and send the call to the changeover switch section 26.
By controlling this, it is possible to automatically switch lines between opposing stations simply by specifying a switching instruction.

[For production]

When the dedicated line 2 is normal, communication is performed by connecting the internal line 6 to the dedicated line 2 via the interface circuit 5, changeover switch section 26, and interface circuit 3.

When a failure occurs in the dedicated line 2, when a switching 1 determination is input to the control unit 22, the control unit 22 controls the interface circuit 24 to instruct a call, and also controls the changeover switch unit 26,
The interface circuit 5 is switched to be connected to the interface circuit 25 of the subscriber line 7 of the exchange network.

The interface circuit 24 is connected to the calling interface of the DCE 27 and inputs the telephone number of the other party stored in advance in the telephone number memory 23. [This will automatically dial and connect to the other party.]

In the line switching device 21 of the partner station having the same configuration, the DCE
27 identifies the incoming call and connects the subscriber line 7 and the interface circuit 25.

When the control unit 22 detects a signal indicating an incoming call via the ink face circuit 25, it controls the changeover switch unit 26 to switch the interface circuit 5 to the interface circuit 25. When the disconnection of the incoming call connection is identified, the line switching connection is restored.

With the switching method described above, only by specifying switching in one station, the switching operation is automatically performed in both opposing stations.

〔Example〕

The line switching device 21 in FIG.
ITT Recommendation v, a dedicated line 2 of a high-speed digital line having a 35 interface is connected to the interface circuit 5 of the internal line 6 via the interface circuit 3 and the changeover switch section 26, and also connected to the interface circuit 25 via the DCE 27. It is assumed that the two opposing stations connected by the dedicated line 2 are connected by a line switching device 21 having the same configuration.

According to the present invention, each line switching device 21 is provided with a telephone number memory 23 for storing the telephone number of the subscriber line 7 of the opposing partner station. Further, an interface circuit 24 is provided for making a call to the exchange network and automatically dialing based on the number information stored in the telephone number memory 23, so that the CC of a known DCE 27 having an automatic dialing function can be used.
Connect to ITT Recommendation ν, 24-200 interface.

When the dedicated port vA2 is normal, the internal line 6 is connected to the dedicated line 2 via the interface circuit 5, the changeover switch section 26, and the interface circuit 3 for communication, and if the dedicated line 2 is in trouble as in the past. When detected by some method, the maintenance person at one station inputs a switching designation using the operation keys of the control unit 22.

Upon receiving the switching designation, the control unit 22 switches the interface circuit 2
4 instructs to make a call, and also controls the changeover switch unit 26 to connect the interface circuit 5 to the subscriber line 7 of the switching network.
interface circuit 25.

When the interface circuit 24 receives a call instruction, the interface circuit 24 connects the DC using the partner station number information stored in the telephone number memory 23.
By controlling E27 and executing automatic dialing,
Configure a connection with the other station via a switched network.

DCE connected to the line switching device 21 of the partner station with the same configuration
27 identifies and responds to the incoming call by known arrangements and returns the subscriber's line'! I! The connection between A7 and the interface circuit 25 is completed.

As is well known in the V.35 interface, when an incoming call is connected, among the signal lines, the CI line indicating the incoming call from the other station is turned on, and the DR line indicating the transmitting/receiving state is turned on.

The interface circuit 25 is configured to relay the signals of the CI and DR lines to the control unit 22 as well.
When detecting the ON signal of the CI line, it controls the changeover switch section 26 to switch the connection of the interface circuit 5 to the interface circuit 25.

Therefore, at the partner station, switching from the dedicated line 2 to the subscriber line 7 is performed without intervention by a maintenance person.

In order to restore the line connection when the failure of the dedicated line 2 is recovered, when the maintenance person of the station where the switching designation was made cancels the switching designation using the previous operation key, the control unit 22 activates the changeover switch unit 26. is controlled to return the interface circuit 5 from the interface circuit 25 to the interface circuit 3.

Also, since the interface circuit 24 is instructed to disconnect the switched network call, the interface circuit 24 recovers and disconnects from the other station via the switched network.

When the line switching device 210 control unit 22 of the other station performs automatic switching based on the CI line ON signal, when it detects that the DR line signal from the modem is turned OFF due to disconnection through the switching network, , automatically controls the changeover switch section 26 to return the interface circuit 5 from the interface circuit 25 to the interface circuit 3.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in a line switching device that uses a digital exchange line as a backup for a digital dedicated line, switching operations of both opposing stations are automatically performed by simply specifying switching at the - station. This has significant industrial effects in that the number of maintenance personnel can be reduced and changeover can be made more quickly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, and FIG. 2 is a block diagram showing an example of a conventional configuration. In the figure, 1.21 is a line switching device, 2 is a dedicated line, -3, 5, 9
, 24 and 25 are interface circuits, 4.26 is a changeover switch section, 6 is an internal line, 7 is a subscriber line, 8.27 is a DCE, 22 is a control section, and 23 is a telephone number memory.

Claims (1)

[Scope of Claims] A changeover switch section (26) and an interface circuit (3, 5, 25) for selectively connecting the device side line to either a dedicated digital line or a subscriber line of a digital switching network.
a line switching device (21) having a storage means (23) for storing a telephone number, and optionally a storage means (23) of the digital switching network;
means (22, 24) for making a connection to a station with a telephone number stored in and for disconnecting said connection;
means (22) for controlling the changeover switch unit to perform predetermined switching; and means (22) for detecting a predetermined state of the subscriber line and controlling the changeover switch unit to perform predetermined switching according to the state; A line switching device characterized by comprising control means (22, 25).