JPS63187960A - Communication adapter - Google Patents

Abstract

PURPOSE:To attain both facsimile communication and personal computer commu nication by means of a common telephone line by automatically discriminating whether it is personal computer communication or facsimile communication based on an identification signal transmitted from an opposite, and switching the telephone line to a facsimile connection terminal. CONSTITUTION:When there is incoming from the telephone line, a network control part 2 detects a bell signal and informs to a communication control part 8. The communication control part 8 supervises a V27ter MODEM 3 and a 1100Hz detection circuit 4 for 5-6 sec, whereby it discriminates whether it is personal computer communication or fasimile communication. If it is facsim ile communication, the bell signal from a facsimile bell signal generation circuit 7 is transmitted. If there is automatic incoming in a facsimile by the bell signal, the network control part 2 detects it by an answering detection circuit 6, and switches a line switching relay 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication adapter that is necessary for communication between personal computers via a public telephone line and has an automatic call receiving means.

〔overview〕

The present invention provides a communication adapter that connects a public telephone line and a personal computer, and switches the personal computer and facsimile device to a single telephone line by temporarily connecting the facsimile machine to the public telephone line during facsimile communication. It allows you to connect and receive calls automatically.

[Conventional technology]

Conventionally, this type of device occupies a telephone line to automatically receive calls, so it has been necessary to prepare a telephone line exclusively for PC communication.

[Problem that the invention seeks to solve]

By the way, there is a strong demand among users who already own a G1 facsimile and users who will own both a G11 facsimile communication and a PC communication to use a common telephone line for both facsimile communication and PC communication. be.

The present invention satisfies these demands and aims to provide a communication adapter that allows both facsimile communication and personal computer communication to be performed over a common telephone line.

[Means for solving problems]

The present invention provides automatic call receiving means that is connected to a public communication line and automatically executes procedures related to receiving data arriving via this line, and a first terminal that connects a personal computer to this call receiving means. The communication adapter is provided with a second terminal for connecting a facsimile device, and a switching means for connecting the second terminal to the public communication line based on an identification signal indicating facsimile communication included in incoming data. It is characterized by

[Effect]

When receiving an automatic call, it automatically determines whether it is a PC communication or facsimile communication based on the identification signal sent from the other party.
In the case of facsimile communication, a bell signal is sent from a bell signal generating circuit to the facsimile machine, and when the facsimile machine responds to the bell signal, the telephone line is switched to the facsimile connection terminal. When the facsimile communication ends, the line is released and ready for the next automatic call.

〔Example〕

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

FIG. 1 is a block diagram showing the configuration of a personal computer communication adapter according to the present invention. This embodiment is a personal computer communication adapter of the communication method recommended for personal computer communication equipment by the Ministry of Posts and Telecommunications.

While waiting for an incoming call from the other party, the line switching relay 5 is connected to the network control unit 2 as a solid line. now,
When there is an incoming call from the telephone line, the network control section 2 detects a bell signal and notifies the communication control section 8. The communication control unit 8 instructs the network control unit 2 to respond to the incoming call, and also sends a V27t
Monitoring of the received data of the er modem 3 and the 1100Hz detection circuit 4 is started.

When the network control unit 2 receives a command to respond to the incoming call from the communication control unit 8, it disconnects the telephone line and responds.

Immediately after this, the partner device sends an identification signal.

The identification signal is determined as follows in (11) Ministry of Posts and Telecommunications Personal Computer Communication Equipment Recommended Communication Method and (21) GIII Facsimile Communication.

(The signal is called 11C3T and is in HDLC transmission format, and is sent out every 1.5 to 2.0 seconds.

(This is a signal called 21CNG, in which a 1100Hz signal is sent for 0.5 seconds and then paused for 3 seconds.

The communication control unit 8 monitors the V27ter modem 3 and the 1100Hz detection circuit 4 for 5 to 6 seconds to determine whether the C5T or C
It is possible to determine whether the result is NG or not. Communication control unit 8 is C8T
If detected, communication will be performed in accordance with the communication method recommended for personal computer communication equipment by the Ministry of Posts and Telecommunications. If CNG is detected, it instructs the network control unit 2 to switch to the Gm facsimile machine.

When the network control unit 2 receives a command to switch to the GII facsimile device, it sends a bell signal to the GII facsimile connection terminal 10 from the bell signal generation circuit 7. When the Gm facsimile machine automatically receives a call using this bell signal, the network control section 2 detects this using the response detection circuit 6, immediately stops sending out the bell signal, and switches the line switching relay 5 to the state shown by the broken line. Thereafter, the GI facsimile machine communicates with the other party's GII facsimile machine, and releases the line when the communication is completed. After switching the line, the network control unit 2 monitors the response detection circuit 6, and when it detects that the line is open, it returns the line relay 5 to the solid line state in preparation for the next automatic call reception.

〔Effect of the invention〕

As explained above, the present invention has the advantage that a personal computer and a facsimile machine can be switched and connected to a single telephone line to automatically receive calls.

[Brief explanation of the drawing]

The figure is a block configuration diagram showing the configuration of an embodiment of the present invention. 1...Telephone line, 2...Network control unit, 3...V27
ter modem, 4...110011z detection circuit, 5.
...Line switching relay, 6...Response detection circuit, 7...
Bell signal generation circuit, 8... Communication control unit, 9... Personal computer connection terminal, 10... Gm facsimile connection terminal.

Claims (1)

[Claims] (1) Connected to a public communication line and equipped with automatic call receiving means that automatically executes procedures related to receiving data arriving via this line, and a first terminal for connecting a personal computer to this call receiving means. A communication adapter comprising: a second terminal for connecting a facsimile device; and a switching means for connecting the second terminal to the public communication line based on an identification signal indicating facsimile communication included in incoming data. Communication adapter with special features.