JP3133703B2 - Modem system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modulation / demodulation
It is called a modem. ) , And particularly to a modem system for performing communication using a telephone line.

[0002]

2. Description of the Related Art Modems for connecting a data terminal such as a personal computer to a telephone line are widely used today and various models are commercially available. In particular, a modem for performing data communication is provided with a switch for arbitrarily switching a plurality of line ports, and is capable of selecting various modem specifications for accessing an information center (JP-A-63-185153) and a dial backup function. (Japanese Patent Application Laid-Open No. Hei 3-249962) has been proposed.

[0003]

However, since a conventional modem having a plurality of line ports is premised on use for a subscriber's telephone line, a plurality of telephone lines are prepared to utilize the function of the plurality of line ports. I needed to.

When a facsimile is used as an alternative printer using a facsimile and a modem with a facsimile function, a computer is connected to a telephone line via a modem with a facsimile function, and the facsimile is connected to another telephone line. Then, a call must be made from the computer and faxed to the facsimile.

[0005] As described above, the conventional modem cannot provide sufficient functions without a plurality of telephone lines, and requires an additional telephone line even when a facsimile on hand is used as an alternative printer. Effectiveness and versatility must be severely limited.

SUMMARY OF THE INVENTION An object of the present invention is to realize various communication functions without using a telephone line.
Extension telephones can be easily implemented using existing telephones
It is to provide a novel modem system that can be.

[0007]

In the modem system according to the present invention, a data terminal has a voice input microphone and a voice output speaker.
And a modem connected to the communication device via a modem.The modem is connected to a telephone line port and to the communication device.
A pseudo line port for inputting / outputting data, interface means for inputting / outputting data, modulation / demodulation means corresponding to voice communication connected to the interface means, and line control means corresponding to voice communication connected to the modulation / demodulation means. , the power
A speech line port and the pseudo line port selection means, and a pseudo line setting means for making the same electric setting as the subscriber telephone line to the pseudo line port, and having a voice communication function.
Characterized in that it.

In other words, the modem system according to the present invention has a pseudo-line port, and has a pseudo-line setting means for giving the pseudo-line port the same electrical characteristics as a normal telephone line. Therefore, if an external communication device is connected to this pseudo line port, an operation equivalent to a state in which it is connected to a normal subscriber telephone line can be performed. For example, if a facsimile is connected to a pseudo line port, the facsimile operates as if it were connected to a normal subscriber telephone line, and can be easily used as an alternative printer. Further, since the data terminal is provided with a microphone for voice input and a speaker for voice output, an extension telephone can be easily realized by connecting the telephone to the pseudo line port.

[0009]

[Embodiment] FIG. 1 is a block diagram illustrating an embodiment of a modem according to the present invention. A data terminal 101 having a voice input microphone and a voice output speaker such as a personal computer is connected to a subscriber telephone line 103 or a pseudo line 104 by a modem 102 according to the present embodiment. The data terminal 101 and the modem 102 are, for example, R
It is connected by the S232C interface 201.

An interface 201 of the modem 102 is used for voice communication for data communication and / or facsimile communication.
Also supports voice communication via the corresponding modem 202
Connected to the line control means. That is, the interface
The base 201 is connected to a network control unit (NCU) 203, and the network control unit 203 is connected to a changeover switch 204. The switch 204 connects the network controller 203 to one of the telephone line port 205 and the pseudo line port 206 under the control of the controller 210. The telephone line port 205 is modularly connected to the normal subscriber telephone line 103. The pseudo line port 206 is connected to an external communication device through the pseudo line 104 as necessary, as described later.

An off-hook detection circuit 207, a RING transmission circuit 208, and a DC supply circuit 209 are connected to the pseudo line port 206. The RING sending circuit 208 generates a calling signal and sends it to the external communication device, and the off-hook detection circuit 207 detects that the external communication device has gone off-hook. The DC supply circuit 209 is connected to the pseudo line line 104.
To supply the same voltage as a normal telephone line,
Thus, the external communication device recognizes the pseudo line 104 as a normal telephone line.

The controller 210 controls the overall communication operation of the modem 102 according to a program stored in advance. The controller 210 switches the switch 204 to connect the network controller 203 to the telephone line port 205 or the pseudo line port 206 in accordance with an instruction from the data terminal 101. 209 is controlled.

When the changeover switch 204 is connected to the pseudo line port 20
In the case where 6 has been selected, the controller 210 activates the RING transmission circuit 208 and the DC supply circuit 209 in accordance with the call command from the data terminal 101, and transmits a call signal to the external communication device through the pseudo line 104. I do. When the off-hook detection circuit 207 detects the off-hook of the external communication device, the RING transmission circuit 2
The RING operation 08 is stopped, and the network controller 203 executes a procedure for establishing a line. When the line connection with the external communication device is established through the pseudo line line 104 in this way, the controller 210 notifies the data terminal 101 that the connection has been established, whereby the data terminal 101 sends out digital transmission data to the modem 102. Modem 1
02 generates and modulates an analog modulated signal in accordance with the digital signal, and transfers the analog modulated signal to the pseudo line port 206 through the changeover switch 204;
Is transmitted to an external communication device through An analog signal received at the pseudo line port 206 from an external communication device is input to the modulation / demodulation circuit 202 through the changeover switch 204 and the network control device 203, demodulated into a digital signal, and transmitted to the data terminal 101.

When the changeover switch 204 is set to the telephone line port 20
When 5 is selected, normal line control is performed,
When the line is established, data transmission and reception are performed as described above.

Next, specifically described an example of use of the modem according to the present embodiment. Here, it is assumed that the data terminal 101 incorporates an auto dialer for making a call connection.

FIG. 2 is a schematic block diagram showing one usage example of the modem according to the present embodiment. Here, modem 1
02 is for FAX communication, and the telephone line port 205 of the modem 102 is connected to the subscriber telephone line 103.
It is assumed that the pseudo line ports 206 are connected to the facsimile 301, respectively. This facsimile 3
01 may be used as long as it is connected to a normal telephone line.

The data terminal 101 is connected to the pseudo line port 20
An automatic dial command for making a call connection with the facsimile machine 301 connected to the modem 6 is sent to the modem 102. Upon detecting this command, the controller 210 of the modem 102 switches the changeover switch 204 to the pseudo line port 206 side, activates the DC supply circuit 209, and supplies a specified DC current to the pseudo line line 104. Subsequently, the RING transmission circuit 208 is activated to transmit a call signal to the facsimile 301 through the pseudo line port 206.

Upon receiving the call signal, facsimile 301 receives the call in response to the call signal. When the incoming call of the facsimile 301 is detected by the off-hook detection circuit 207 of the modem 102, the controller 210 stops the RING operation of the RING transmission circuit 208, and
3, a negotiation for facsimile communication is performed to establish a communication procedure. Once the communication procedure is established,
The data terminal 101 transmits data to the facsimile 301, and the facsimile 301 prints out the data from the data terminal 101 on a set sheet. As described above, the facsimile machine 301 connected to the pseudo line port 206 can be easily used as an alternative printer.

FIG. 3 is a schematic block diagram showing a second usage example of the modem according to the present embodiment. Here, the modem circuit 202 of the modem 102 is for data communication, and the telephone line port 205 of the modem 102 is connected to the subscriber telephone line 103.
The pseudo line port 206 is connected to another telephone line modem 30.
2 are connected to each other. Further, the telephone line modem 302 is connected to another data terminal 303.

The data terminal 101 is connected to the pseudo line port 20
An automatic dial command for making a call connection with the telephone line modem 302 connected to the telephone number 6 is transmitted to the modem 102. Upon detecting this command, the controller 210 of the modem 102 switches the changeover switch 204 to the pseudo line port 206 side, activates the DC supply circuit 209, and supplies a specified DC current to the pseudo line line 104. Subsequently, the RING transmission circuit 208 is activated to transmit a call signal to the telephone line modem 302 through the pseudo line port 206.

Upon receiving the call signal, the telephone line modem 302 receives the call signal. Modem 102
When the off-hook detection circuit 207 detects an incoming call from the telephone line modem 302, the controller 210
The RING operation of the ING sending circuit 208 is stopped, and a negotiation for data communication is performed by the network control device 203 to establish a communication procedure. When the communication procedure is established, the data terminal 101 transmits data to the partner data terminal 303, and conversely, the partner data terminal 303 also transmits data to the data terminal 301. in this way,
Telephone line modem 3 connected to pseudo line port 206
02, data communication between the two data terminals 301 and 303 can be easily performed.

FIG. 4 is a schematic block diagram showing an example of use of the modem in the present embodiment. In the present invention , the modem 102 has a voice communication function, and the telephone line port 205 of the modem 102 is connected to the subscriber telephone line 103, and the pseudo line port 206 is connected to another telephone set 304. Voice input microphone and a voice output speaker is equipped as shown in FIG. 4 the data terminal 101.

The data terminal 101 is connected to the pseudo line port 20
An automatic dial command for making a call connection with the telephone set 304 connected to the telephone number 6 is transmitted to the modem 102. Upon detecting this command, the controller 210 of the modem 102 switches the changeover switch 204 to the pseudo line port 206 side, activates the DC supply circuit 209, and supplies a specified DC current to the pseudo line line 104. Then, RIN
The G sending circuit 208 is activated to send a call signal to the telephone set 304 through the pseudo wire port 206.

Upon receiving the call signal, telephone set 304 receives the call in response to the call signal. When the incoming call of the telephone set 304 is detected by the off-hook detection circuit 207 of the modem 102, the controller 210
When the RING operation is stopped and a communication procedure for a call is established, a call can be made between the data terminal 101 and the telephone 304. Thus, simply connecting the telephone set 304 to the pseudo line port 206 can easily realize a so-called extension call.

[Brief description of the drawings]

1 is a block diagram illustrating one embodiment of a locking Ru modem to the present invention.

FIG. 2 is a schematic block diagram showing one usage example of the modem according to the embodiment.

FIG. 3 is a schematic block diagram showing a second usage example of the modem according to the embodiment.

FIG. 4 is a schematic block diagram illustrating the present embodiment.

[Explanation of symbols]

 Reference Signs List 101 data terminal 102 modem 103 subscriber telephone line 104 pseudo line line 201 interface 202 modulation / demodulation circuit 203 network control device 204 switch 205 telephone line port 206 pseudo line port 207 off-hook detection circuit 208 RING transmission circuit 209 DC supply circuit 210 controller

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-37957 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 11/00-11/10

Claims (2)

(57) [Claims] 1. A data terminal connects to a communication device via a modem.
In the connected modem system,The data terminal, Equipped with a microphone for voice input and a speaker for voice output,  The modem includes a telephone line port for connecting to a subscriber telephone line, a pseudo line port for connecting to the communication device, and an interface for inputting and outputting data to and from the data terminal.
Connected to the interface means and the interface means.Supports voice communication
WasA modem connected to the modemCompatible with voice communicationLine system
And any one of the telephone line port and the pseudo line port
Selection means for selecting one and connecting to the line control means
And when the pseudowire port is selected, the pseudowire port is selected.
Pseudo to set the same electrical settings as the subscriber telephone line
Line setting means andHaving a voice communication function,  A modem system, characterized in that: 2. The pseudo line setting means includes: a power supply unit for supplying the same direct current to the pseudo line port as the subscriber telephone line; a calling unit for transmitting a call signal to the pseudo line port; modem system of claim 1, wherein the detecting means for detecting an incoming call of the communication devices connected to the port, in that it consists of.