JPH11168542A - G4 facsimile equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a G4 facsimile equipment by which a channel use form is changed in accordance with the line kind of an opposite party. SOLUTION: In this G4 facsimile equipment which is connected to an ISDN (integrated services digital network) and communicates a PSTN(public switched telephone network) equipment, when an opposite party is an ISDN device, and when redialing is made during communication of one channel, the other channel connects to the same party. When the opposite party I the PSTN equipment, connection is not made even when redialing is made during the communication with one channel. Since the form of use of channel is changed in accordance with the line kind of the opposite party, useless call out is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a G4 facsimile apparatus having G4 and G3 communication functions, and more particularly to a G4 facsimile apparatus capable of changing a channel use mode according to a line type of a partner.
It relates to a 4-facsimile machine.

[0002]

2. Description of the Related Art Conventionally, a facsimile apparatus is generally connected to a public line (PSTN) which is an analog line and performs G3 (International Telecommunication Union (ITU) -T Recommendation T.4 group 3) communication. However, in recent years, a G4 facsimile apparatus connected to a digital line such as an integrated service digital network (ISDN) and performing G4 (Group 4 of ITU-T Recommendation T.6) communication is becoming widespread. In general, such a G4 facsimile apparatus can also perform G3 communication.

When G3 communication is performed from a G4 facsimile apparatus connected to ISDN to a facsimile apparatus connected to PSTN, the communication is performed via ISDN.

[0004]

The ISDN equipment is provided with two B channels for communication.
Communication can be performed using two B channels simultaneously. Therefore, for example, the G4 facsimile apparatus transmits and receives two facsimile units using two B channels, and uses one B channel to perform personal computer communication from a personal computer connected to a terminal while using another B channel. And send and receive facsimile. Also, when the other party is a similar ISDN device, it is possible to communicate with the same party using two B channels simultaneously. While communicating using one B channel, another B channel can be connected to the same partner.

[0005] However, when the other party is a PSTN device, when communicating using one B channel,
If you try to connect another B channel to the same party, you are busy and cannot connect. The operator of the ISDN equipment can determine whether the other party is an ISDN equipment by PST.
The connection operation may be performed without knowing whether the device is an N device, and the user may be confused when busy.

An object of the present invention is to solve the above-mentioned problems and to provide a G4 facsimile apparatus capable of changing the channel use mode according to the line type of the other party.

[0007]

In order to achieve the above object, the present invention provides a G4 facsimile apparatus connected to an ISDN and capable of communicating with a PSTN device.
In the case of an SDN device, if a redial operation is performed during communication of one channel, a connection operation for connecting another channel to the same partner is performed. If the other party is a PSTN device, the connection operation is performed during communication of one channel. Even if a redial operation is performed, the connection operation is not performed.

It may be displayed that the connection operation is not performed.

If the one channel is in G4 communication, it is determined that the other party is an ISDN device, and the G3 communication is performed.
If communication is in progress, the other party may be determined to be a PSTN device.

[0010]

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

FIG. 1 shows a flow of the operation of the G4 facsimile apparatus according to the present invention, and FIG. 2 shows a circuit configuration of the G4 facsimile apparatus which executes this flow.

First, as shown in FIG. 2, the G4 facsimile apparatus includes a main control unit 1, a ROM 2, a RAM 3, an image memory 4, a display unit 5, an operation unit 6, a reading unit 7, a recording unit 8,
Codec 9, LAP-B10, S interface 1
1, a voice codec 12, and a G3 modem 13.

The main control section 1 is composed of an MPU and operates each section based on a program. The operation according to the present invention is also described in the program.

The ROM 2 stores a program to be executed by the main controller 1.

The RAM 3 is composed of an SRAM, a flash memory or the like, and stores temporary data generated when a program is executed.

The image memory 4 is composed of a DRAM and stores image data for facsimile transmission and reception.

The display unit 5 is composed of an LCD display.
4 The operation status of the facsimile machine, telephone number, operation instruction,
An error message or the like can be displayed.

The operation unit 6 includes numeric keys for inputting numbers, speed dial keys for speed dial operation, one touch keys for one touch operation, various function keys, start keys, and the like. These include a redial key.

The reading unit 7 has an image pickup device such as a CCD,
The original can be read to generate binary image data.

The recording section 8 includes a printer of an electrophotographic system or the like, and can record (print) image data received from another G3 or G4 facsimile apparatus.

The codec 9 converts the binary image data read from the original into image data for facsimile transmission and reception, and converts the received image data into binary image data.

The LAP-B 10 performs data communication by controlling a protocol for the ISDN B channel. Two B channels are prepared, and one B channel can be used while another B channel is being used. In the following, the channel used earlier will be referred to as B1, and the channel used later will be referred to as B2.

The S interface 11 has a protocol processing function, a maintenance function, and an interface function, and further has a built-in LAP-D function for controlling a protocol for an ISDN D channel.

The voice codec 12 is for mutually converting digital data transmitted and received by ISDN and an analog voice signal used by the G3 modem 13.

The G3 modem 13 modulates and demodulates image data and analog audio signals in G3 communication.

Note that, in addition to the above configuration, the G3 modem 1
One or a plurality of NCUs 15 and NCUs 15 may be provided so that they can be directly connected to one or more PSTN lines. Although the above configuration is for connecting one line of ISDN, a plurality of lines may be connected. PS
A plurality of TNs may be connected.
In short, the present invention is effective if it is configured to connect at least one ISDN line.

Referring to FIG. 1, the operation of changing the channel use mode according to the line type of the other party will be described.

First, when the first B channel is used, if there is a dial operation or a shortening / one-touch operation by the operator, a call is immediately made, and if the call is established, communication is started. The flow up to this point is the same for G3 communication and G4 communication. In the case of G4 communication, LAP-B1
0, and in the case of G3 communication, an analog audio signal from the G3 modem 13 is transmitted to the audio codec 12.
After converting to digital data with S interface 1
1, data transmission is performed. When the communication is started, the redial operation becomes possible, so that the user waits for the redial operation.

In the redial operation, when the redial key of the operation unit 6 is pressed, the telephone number which has just been called is recalled. Shall be performed.

When the redial operation is performed, it is checked whether the preceding channel is under G4 communication or G3 communication. This is because the other party of the G4 communication is always determined to be an ISDN device similar to the present G4 facsimile apparatus, and the other party of the G3 communication is determined to be highly likely to be a PSTN device. Only when the other party is an ISDN device, the second B channel can be connected to the same party. Therefore, if the preceding channel is under G4 communication, a call is made for another B channel, and if the call is established, communication is started.

If the preceding channel is under G3 communication, the redial operation is invalidated and no call is made. Then, on the display unit 5, the fact is displayed by, for example, an error message “calling is not possible”.

Next, the state of the line at the time of the redial operation will be described with reference to FIG.

The G4 facsimile machine 31 shown in FIGS. 3A and 3B can communicate with the facsimile machine 33 on the other side via the network 32.
The network 32 includes a plurality of line types, and includes ISDN and PS.
TN is included.

As shown in FIG. 3A, the facsimile machine 33 on the other side is also an ISDN machine, and the G4 facsimile machine 31 performs G4 communication ahead of the ISDN B1 channel. . This book G4
It is assumed that the facsimile apparatus 31 makes a call later using the B2 channel. As a result of the redial operation, a call is re-established to the facsimile machine 33 of the other party to which the B1 channel is currently connected. The other party's facsimile machine 33 can receive a call through the B2 channel.

As shown in FIG. 3B, when the present G4 facsimile machine 1 is connected to a plurality of PSTN lines, the other facsimile machine 34 is a PSTN machine and the present G4 facsimile machine 31 is It is assumed that G3 communication is performed by PSTN. In this G4 facsimile apparatus 31, even if a call is made to make a call to the other party's facsimile apparatus 34 via another PSTN line, the call is merely busy. Therefore, the G4 facsimile machine 31 does not make a call even if a redial operation is performed, and informs the operator by displaying the fact.
Therefore, the operator can easily understand that the facsimile machine 34 of the other party currently communicating cannot use the telephone at the same time, and there is no confusion. This G4
The same result is obtained even when the facsimile apparatus 31 performs G3 communication using ISDN and is converted to the PSTN in the network 32 and connected to the facsimile apparatus 34 on the other side.

[0036]

The present invention exhibits the following excellent effects.

(1) If the other party's line type can use a plurality of channels such as ISDN, use a plurality of channels and the other party's line type can use only a single channel like PSTN. Then, since only a single channel is used, useless calling is prevented.

(2) Since it is displayed that no connection operation such as calling is performed, the operator can easily understand.

(3) Since the line type of the other party is determined based on whether G4 communication or G3 communication is being performed, useless calling can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a flowchart of the operation of a G4 facsimile apparatus showing one embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a G4 facsimile apparatus that executes the flow of FIG.

FIG. 3 is a diagram illustrating a state of use of a line by a G4 facsimile machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main control part 2 ROM 3 RAM 4 Image memory 5 Display part 6 Operation part 7 Reading part 8 Recording part 9 Codec 10 LAP-B 11 S interface 12 Audio codec 13 G3 modem

Claims (3)

[Claims] In a G4 facsimile apparatus connected to ISDN and capable of communicating with a PSTN device, if the other party is an ISDN device, if a redial operation is performed during communication of one channel, another channel is changed. Perform the connection operation to connect to the same partner, and the partner
A G4 facsimile apparatus, wherein the connection operation is not performed even if a redial operation is performed during communication of one channel when the apparatus is a device. 2. The G4 facsimile apparatus according to claim 1, wherein a message indicating that the connection operation is not performed is displayed. 3. If the one channel is under G4 communication, it is determined that the other party is an ISDN device,
The G4 according to claim 1 or 2, wherein when the three communication is being performed, the other party is determined to be a PSTN device.
Facsimile machine.