JPH01162100A - Isdn exchange system - Google Patents

Abstract

PURPOSE:To obtain the exchange system of high connecting efficiency by providing a means to detect that an incoming destination is a second terminal equipment, which is received to its own-terminal adapter, based on connection requesting information from a first terminal equipment received to own-terminal adapter. CONSTITUTION:In case of a connecting request to another telephone set 1b which is connected and received to a same terminal adapter 2a, an outgoing person to use a telephone set 1a executes operation to add and to send the special number of one digit to a called side telephone set number in advance in order to distinguish the request from the connecting request to the telephone set which is connected and received to another terminal adapter 2n. When the telephone set connected and received to own-terminal adapter 2a is identified to be the incoming destination in a telephone set identifying circuit 26, a terminal adapter control circuit 25 causes a line circuit 21b to call the telephone set 1b and when there is a response, a link 22a is connected to a selecting circuit 22. Thus, the telephone set 1a and the telephone set 1b can be connected to own self-terminal adapter 2a and communication can be executed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an ISDN switching system.

[Conventional technology]

Conventionally, in an ISDN switching system, switching connections between calling and receiving terminal equipment (telephones) are controlled in a line switching section of the main body of the ISDN switch.

- Referring to FIG. 2 which shows an example, the connection request information created by the telephone 1a is transferred to the line circuit 2 of the terminal adapter 2a.
1a to the terminal adapter control circuit 25,
Here, it is converted into an interface format with the line switching unit 4, and the D channel handler 24. D channel 200
c, the S/T interface circuit 23.2 is sent to the line switching unit 4 via the B+D channel basic access line 200d and the network termination circuit 3. The line switching unit 4 searches for a connection destination based on the received connection request information, passes the incoming call request information to the terminal adapter control circuit 25 via the reverse route, and the terminal adapter control circuit 25 connects the line circuit 21b.
When there is a response, it is sent to the line switching section 4 via the above route, and the connection between the telephone 1a and the telephone lb is completed for the first time via the line switching section 4. therefore,
For this connection, 2B channels of the basic access line 200d will be occupied, and other terminal adapters 2n connected to the same network termination circuit 3 will
Services using the B channel of the SDN exchange system will no longer be available. In addition, in the same figure, 200a, 2
00b is B1 channel.

This is the B2 channel.

[Problem that the invention seeks to solve]

In the conventional ISDN switching system described above, the 2B+D channel basic access line shared by a plurality of terminal adapters cannot be used efficiently.

[Means for solving problems]

The present invention provides an IS system for connecting a plurality of terminal adapters each accommodating at least two terminal devices to a line switching unit via 2B+D channel basic access lines.
In a DN exchange system, based on connection request information from a first terminal device accommodated in the own terminal adapter, it is detected that the destination of the call is a second terminal device accommodated in the own terminal adapter. and means for connecting and communicating the first terminal device and the second terminal device within the own terminal adapter.

〔Example〕

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

Referring to FIG. 1 showing one embodiment of the present invention, a telephone 1
The connection request information created in a is sent to terminal adapter 2a.
The signal is sent to the terminal adapter control circuit 25 and telephone identification circuit 26 via the line circuit 21a. Here, it is determined whether or not the request is for connection to another telephone connected to the own terminal adapter 2a. Callers using telephone 1a use the same terminal adapter 2a.
If it is a connection request to another telephone 1b connected to and accommodated in the terminal adapter 2n, in order to distinguish it from a connection request to a telephone connected to and accommodated in another terminal adapter 2n, for example, at least Add a one-digit special number to the telephone number of the called party and send it.

When the telephone identification circuit 26 identifies that the telephone 1b connected and housed in its own terminal adapter 2a is the destination of the call, the terminal adapter control circuit 25 causes the line circuit 21b to call the telephone 1b, and when there is a response, A link 22a is connected to the selection circuit 22. Thereby, the telephone 1a and the telephone 1b can be connected and communicated within their own terminal adapter 2a.

In the figure, 23 is an S/T interface circuit;
4 is a D channel handler, 200a, 200b are Bl,
B2 channel, 200C is D channel, 200d is 2B
3 is a network termination circuit, and 4 is a line switching section of an ISDN exchange.

Note that the telephone 1a that made the call is connected to another terminal adapter 2.
When a connection is requested to a telephone set housed in "n", processing is performed in the same manner as in the conventional case, and a communication path is set up via the line switching section 4 and the basic access line 200d.

In the above embodiment, the terminal device was a telephone, but
The same method can be applied to connection of a facsimile terminal or the like having a similar interface circuit.

〔Effect of the invention〕

As explained above, according to the present invention, when a connection request is made to a terminal device that is connected and accommodated in the same terminal adapter, by sending connection request information such as adding a special number to the destination terminal number, Connection can be completed by processing only within the own terminal adapter. Therefore, since the basic access line shared with other terminal adapters is not used, the opportunity to receive service for the ISDN switching system by other terminal adapters is reduced, and the processing of the line switching section of the I5DN switching system is also reduced. with high connection efficiency.
We can provide an SDN exchange system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional ISDN switching system. la, lb...Telephone, 2a, 2b...Terminal adapter, 21a, 21b...Line circuit, 22...
- Selection circuit, 23... S/T interface circuit,
24...D channel handler, 25...Terminal adapter control circuit, 26...Telephone identification circuit, 3...
- Network termination circuit, 4... Line switching section, 200d... Basic access line. Agent Patent Attorney Oto Uchihara

Claims (1)

[Scope of Claims] In an ISDN switching system in which a plurality of terminal adapters each accommodating at least two terminal devices are connected to a line switching unit via a 2B+D channel basic access line, means for detecting that the destination of the call is a second terminal device accommodated in the own terminal adapter based on connection request information from the terminal device; and the first terminal device and the second terminal device. and means for connecting and communicating within the own terminal adapter.