JPS61274565A - Terminal selection communication system - Google Patents

Abstract

PURPOSE:To perform the communication setting of data, etc. between terminal machines by means of a telephone circuit by using a command consisting of multi-frequency signals to select automatically the terminal machines to be connected. CONSTITUTION:At the originating side a dialing operation is carried out automatically or manually via an operating part 10a or a main telephone set 3a. The connection processing is finished by a busy tone via the monitor function of a connection control part 4a. The part 4a transmits a command consisting of multi-frequency signals showing numeric characters of the prescribed plural digits which designate the connection of desired terminal machines in cooperation with a control part 9a. At the incoming side the multi-frequency signals are decoded at a connection control part 4b and informed to a control part 9b for preparation of connection within a terminal equipment. Then the acknowledge signal is sent back to the originating side according to the information of a selected terminal interface circuit 71b. At the same time, the contents of a terminal machine 81b designated as an incoming state are displayed on a display part 11b. Then the acknowledge signal is received at the originating side and a desired terminal machine 81a is connected to a circuit 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a communication system that uses a telephone line to transmit data, facsimile, images, and/or control information (hereinafter referred to as data, etc.) by switching between the telephone and the telephone. In particular, the present invention relates to a terminal selection communication system in which a terminal machine on the called side is selectively connected based on a command from the calling side.

[Conventional technology]

Conventionally, this type of communication system includes a system in which attached equipment such as a telephone or connected equipment such as a network control device is used, and information such as data is transmitted by switching between the telephone and the telephone.

[Problem that the invention seeks to solve]

In the communication of information such as data using the above-mentioned conventional telephone auxiliary equipment or connected equipment, switching between the telephone and the terminal machine is done manually or by setting the connection to the terminal machine in advance. There was a drawback that terminal machines with different functions could not be automatically connected or communication could not be performed.

[Means for solving problems]

An object of the present invention is to propose a terminal selection communication system that solves the above-mentioned problems.

The present invention uses a predetermined multi-frequency signal that specifies connection of a desired terminal machine in a terminal selection communication method in a communication system in which communication of data, etc. is switched between terminal machines using a telephone line using a telephone line. The configured command is sent from the calling side to the called side, the called side decodes the command, selects a terminal machine and connects it to the telephone line, and the calling side checks the response signal corresponding to the connected terminal machine. It is characterized by setting communication.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram for explaining one embodiment of the present invention, and shows both terminal devices that communicate.

In the figure, the explanation will be made assuming that the terminal device on the left side is the calling side and the terminal device on the right side is the receiving side. Note that both terminal devices have the same configuration, and corresponding elements are given the same numbers, elements on the originating side are indicated with a subscript a, and elements on the receiving side are indicated with a subscript s. For the purpose of explanation, if there is no need to distinguish between the calling side and the called side, only numbers without subscripts will be used in the description.

A line interface 2 connected to the telephone line 1 has a switching function with the telephone 3 and a network control function, and a connection control section 4. In cooperation with the control section 9, it has a function of making and receiving calls on the line and a function of selecting and confirming a terminal machine. When a required terminal machine 81, 82, .

52 . . . and selects the required circuit from the terminal machine interface circuit 7 through the switching circuit 6. , ? 2... to the terminal machine 8. ．． 82 Connect...

A line connection procedure for exchanging data, etc. between the terminal machine 8ta on the transmitting side and the terminal machine 8ib on the receiving side will be explained. First, dialing is performed automatically or manually using the operation unit 10a or the telephone 3a on the calling side. If a busy tone is detected while an exchange connection is in progress, the connection processing is terminated by the monitoring function of the connection control section 4a. The connection control unit 4a, which monitors the ringback tone from the other subscriber, that is, the called party, and the connection due to its termination, cooperates with the control unit 9a to generate a predetermined number of multiple digits that specifies the connection of a desired terminal machine. Sends a command consisting of a multi-frequency signal representing .

On the receiving side, the multi-frequency signal following the incoming call response is connected to the connection control unit 4b.
, transmits the information to the control unit 9b, causes the terminal device to prepare for connection, and returns an acknowledgment signal to the originating side based on the information of the selected terminal machine interface circuit 7tb.
At the same time, the terminal machine 81b is designated as an incoming call on the display unit 11b.
Display the contents of.

If the specified terminal machine does not exist or is not in use, a negative response signal is returned or no response is made.

On the calling side, when the connection control unit 4a receives an acknowledgment signal from the called side, it instructs the control unit 9a to connect the desired terminal machine 81a to the terminal machine interface circuit 71a, the switching circuit 6a, and the designated signal conversion circuit 51a. The communication settings are made by connecting to line 1 via line interface 2a. The control unit 9a monitors the terminal machine interface 7a, and when it detects the end of information transmission or some kind of accident, it instructs the connection control unit 4a to confirm the line connection with the other party, and then closes the line. Release the connection.

The receiving side detects the connection confirmation signal after the communication ends and displays the end of the communication. If the line is disconnected without a connection confirmation signal, abnormal reception is displayed on the display section 11b.

It goes without saying that the above control is unnecessary in the case of simple telephone communication.

〔Effect of the invention〕

As explained above, the present invention automatically selects and connects terminal machines to be connected using commands composed of multi-frequency signals, thereby enabling various communications such as data using relatively low-traffic telephone lines. This has the effect of enabling automatic transmission and reception, including unattended communication from terminal machines, and providing convenience to diversifying information communications.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a terminal device on a calling side and a receiving side for explaining an embodiment of the present invention. 1...Telephone lines 2a, 2b...Line interfaces 3a, 3b...Telephones 4a, 4b...Connection controllers 5a, 5b...Signal converters 6a, 6b...Switching circuit? a, 7b...Terminal machine interface 8ta, 8
za, 8ib, 82b...Individual terminal machine 9
a, 9b...Control units 10a, 10b...Operation units 11a, 11b...Display unit

Claims (1)

[Claims] (1) In a terminal selection communication method in a communication system in which communication of data, etc. is switched between terminal machines and a telephone using a telephone line, it consists of a predetermined multi-frequency signal that specifies the connection of a desired terminal machine. A command is sent from the calling side to the called side, the called side decodes the command, selects a terminal machine and connects it to the telephone line, and the calling side confirms the response signal corresponding to the connected terminal machine and then communicates. A terminal selection communication method characterized by setting.