JPH0548771A - Communication device - Google Patents

Abstract

PURPOSE:To use an attached PSTN telephone set for both a PSTN line and an ISDN line by using one telephone control means at need. CONSTITUTION:An operator when making a telephone call selects an operation mode by operating an operation display part 9 as specified and also selects a line to be used. When the PSTN line is selected, a switch circuit S1 is controlled to connect a telephone set 1 to a PSTN interface part 5. After a dial signal is sent out, the telephone line 1 is connected directly to the PSTN line. When the ISDN line is selected, on the other hand, circuits S1 and S3 are controlled to connect the telephone set 1 to a CODEC 7 through an interface circuit 8a. Then the telephone set 1 is applied with a DC voltage from the circuit 8 and enabled to operate. Consequently, the attached telephone set can be used for both the PSTN line and ISDN line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a PSTN (Publi).
c Switched Telephon-e Net
work line and ISDN (Integrated S)
ervic-es Digital Network)
The present invention relates to a communication device that connects a line and selectively uses one of the two types of lines for communication.

[0002]

2. Description of the Related Art Generally, a facsimile machine used in PSTN is equipped with a telephone in an internal or external form.

On the other hand, in recent years, a facsimile apparatus has been put into practical use, in which both the PSTN line and the ISDN line are connected and can be used on either line. A telephone is often attached to such a facsimile apparatus.

[0004]

However, conventionally, the telephone of the facsimile apparatus using the two types of lines is dedicated to the PSTN line and cannot be used on the ISDN line.

The present invention solves the above-mentioned inconveniences and improves the PST.
An object of the present invention is to provide a communication device capable of using an attached telephone for both N line and ISDN line.

[0006]

To this end, the present invention provides P
No device power supply is required when making and receiving calls on the STN line P
PSTN call control means for making and receiving a call to and from the STN telephone on the PSTN line to form a communication link to bring the destination telephone and the above-mentioned telephone into a call state, and to make and receive a call on the ISDN line to form a communication link It is characterized in that it is provided with a telephone and an ISDN call control means for bringing the telephone into a call state, and the operation state of one call control means is selected as required.

[0007]

As a result, the attached telephone can be used on both the PSTN line and the ISDN line.

[0008]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram of a facsimile apparatus according to an embodiment of the present invention. In the figure, a telephone 1 is an ordinary telephone for PSTN line. At the time of transmission, the facsimile image processing unit 2 compresses image information obtained by reading an original image, while
At the time of reception, the received data is restored to image information and an image is recorded on recording paper. The G3 communication processing unit 3 uses the modem 3
It has a, executes a predetermined transmission control procedure in the G3 mode, and modulates and demodulates image information for transmission and reception. G
The 4 communication processing unit 4 executes a predetermined transmission control procedure in the G4 mode to transmit / receive image information.

The PSTN interface section 5 is a PSTN interface unit.
A line is connected, and when a call is made or received on the PSTN side, line control is performed to transmit / receive a data signal. ISD
The N interface unit 6 is connected to the ISDN line,
The SDN side performs call control at the time of an incoming / outgoing signal and transmits / receives a data signal, and has a call control means 6a corresponding to the function of layer 3. The CODEC 7 converts a voice band signal into a data signal of 64 kbps and performs the reverse conversion.

The switching section 8 is composed of switch circuits S1 to S3 and an interface circuit 8a, and is composed of the telephone 1 and G.
3 The signal line of the communication processing unit 3 is switched and connected to the PSTN interface unit 5 or the CODEC 7 side as necessary. The interface circuit 8a applies a DC voltage to the telephone 1, and at the same time, a two-wire type signal on the telephone 1 side and C
Mutual conversion is performed with a 4-wire signal on the ODEC7 side.

The operation display unit 9 displays the operating state of the device while the operator performs various operations. In the present embodiment, the operation / display section 9 is provided with FAX / TEL mode selection means 9a and line selection means 9b in addition to various operation means generally provided.
The FAX / TEL mode selection means 9a switches the operation mode between the facsimile communication mode and the telephone mode, and the line selection means 9b uses the line to be used, that is, P.
The STN line and the ISDN line are selected. The control unit 9 is a microcomputer that monitors and controls each of the above units.

Next, the transmission operation of the facsimile apparatus of the present embodiment having the above configuration will be described.

When making an outgoing call, the operator selects the operation mode and the line to be used by a predetermined operation of the operation display unit 9 as shown in FIG. Then, the dial number of the transmission destination is input and the device is activated (process 101).

When the facsimile machine is activated, it discriminates the selected operation mode (process 102). If the telephone mode is selected (Y in process 102), the line selected next is determined (process 103). here,
If the PSTN line is selected (Y in process 103), the switch circuit S1 of the switching unit 8 is controlled to control the telephone 1
To the PSTN interface unit 5 (Processing 10)
4). Next, a predetermined dial signal is transmitted from the PSTN interface unit 5 to call the destination (Process 10).
5).

After sending the dial signal, the telephone set 1 is
Directly connected to the N line. As a result, when the other party responds, a communication link is formed, and a call is established with the other party's telephone (process 106). When the operator finishes the call,
Off-hook the telephone 1. This disconnects the call,
The device operation ends (process 107).

On the other hand, assuming that the ISDN line is selected in the above (N in process 103), the switch circuit S
1 and S3 to control the telephone 1 to interface circuit 8a
To connect to the CODEC 7 via (step 108). As a result, the telephone 1 becomes operable by applying the DC voltage from the interface circuit 8a. Then, a predetermined signal is sent from the ISDN interface unit 6 to make a call and establish a call connection with the other party (process 109).

When a communication link with the other party is formed by the call connection, the transmission signal of the telephone 1 is converted into a digital signal by the CODEC 7 and transmitted. In addition, the telephone device 1 converts the received data signal into an analog signal by converting the signal into an analog signal
To enter. As a result, a call state with the other party is established (process 106). Then, when the telephone line 1 is off-hook by the operator, the call is disconnected and the operation of the device is terminated (process 107).

On the other hand, when the facsimile communication mode is selected (N in step 102), the selected line and communication mode are further discriminated, and the switching section 8 is switched, and then the facsimile communication is performed in a predetermined operation. To execute. For example, when the PSTN line is selected and communication is performed in the G3 mode, the G3 communication processing unit 3 is connected to the PSTN interface unit 5. In the ISDN G3 mode, the G3 communication processing unit 3 is connected to the CODEC 7. Since this facsimile communication operation is not directly related to the present invention, detailed description thereof will be omitted.

Next, the incoming operation of this facsimile will be described.

As shown in FIG. 3, if the ISDN side or PSTN side receives an incoming call (process 201), the facsimile machine determines the selected operation mode (process 202). Now, assuming that the telephone mode is set (Y in process 202), the next incoming line is determined (process 203). If it is on the PSTN side (Y in process 203), the telephone 1 is connected to the PSTN interface unit 5 (process 204).

As a result, the operator goes off-hook on the telephone set 1 to establish a communication state with the other party (process 205). Thereafter, when the telephone 1 is hooked on, the facsimile machine disconnects the call and ends the operation (process 206).

On the other hand, when the call arrives on the ISDN side (N in step 203), the telephone 1 is connected to the CODEC 7 through the interface circuit 8a (step 207) and the call connection procedure is executed (step 208). As a result, as in the case of the above-mentioned call, the call state with the other party is established (process 20).
5). Thereafter, when the telephone 1 is hooked on, the facsimile machine disconnects the call and ends the operation (Process 2).
06).

If the facsimile communication mode is set when the call is received (N in step 202), predetermined facsimile communication is executed. Since this facsimile communication operation is not directly related to the present invention, a description thereof is omitted here, and although not shown, this facsimile apparatus is equipped with a power switch, for example, when the apparatus is not used for a long period of time. The power switch is turned off. In addition, the power may be cut off due to a power failure or the like.

In this embodiment, when the power is turned off in this way, the switching unit 8 forcibly switches and connects the telephone 1 to the PSTN interface unit 5 as shown in FIG. Process 301).

As described above, in this embodiment, the telephone for PSTN is provided and used as it is in the case of the PSTN line, while the interface circuit 8a and the CODEC 7 are added in the circuit in the case of the ISDN line. Due to
It can be used with ISDN. This allows
One telephone 1 can be shared by both lines. Further, when an incoming call is made in the telephone mode, the line of the called line is automatically set, so that the operator does not need to select the line.

Further, when the power is off, the PST is forcibly forced.
It is connected to the N side. Phone 1 is PSTN
In the case of a line, it can be used without supplying power from the device. As a result, when the power is turned off, the PSTN can be automatically switched to the usable PSTN.

It goes without saying that the telephone 1 of the above-mentioned embodiment may be built in the facsimile machine or may be attached externally. Further, although the description has been given by taking the facsimile apparatus including the telephone as an example, the present invention can be similarly applied to various communication apparatuses such as a word processor having a communication function and a copying apparatus having an image transmission function.

[0029]

As described above, according to the present invention, the attached PSTN telephone is provided with the call control means for using the PSTN line and the call control means for using the ISDN line, and if necessary. Since one of the call control means is used, the attached telephone can be used for both the PSTN line and the ISDN line.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart of a transmission operation of the facsimile device.

FIG. 3 is a flowchart of an incoming call operation of the facsimile device.

FIG. 4 is a flowchart of a control operation when the power of the facsimile apparatus is turned off.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Telephone 2 Facsimile image processing section 3 G3 communication processing section 4 G4 communication processing section 5 PSTN interface section 6 ISDN interface section 7 CODEC 8 switching section 8a interface circuit 9 operation display section 9a FAX / TEL mode switching means 9b line selecting means S1, S2 switch circuit

Claims (3)

[Claims] 1. A communication device for connecting a PSTN line and an ISDN line, and selectively using one of the lines for communication, wherein the device power supply is not required when making and receiving a call on the PSTN line. PSTN call control means for making and receiving a call to and from the telephone set on the PSTN line to establish a communication link between the destination telephone set and the telephone set, and ISDN
ISDN call control means for making and receiving a call on a line to form a communication link to put the other party's telephone and the above telephone into a call state,
A communication device comprising the ISDN call control means and a call line selection means for selecting one of the operation states of the PSTN call control means. 2. The call line selecting means is provided with a forced switching means for forcibly selecting the operating state of the PSTN call control means when the power source of the apparatus is off. Item 1. The communication device according to Item 1. 3. The communication apparatus according to claim 1, wherein the communication line selecting means includes an automatic switching means for selecting an operation state of one of the PSTN line and the ISDN line which has arrived.