JPH11168615A - G4 facsimile connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a G4 (group 4 of International Telecommunications Union(ITU)-T recommendations T.6) facsimile connection method by which G3 (group 3 of ITU-T recommendations T.4) communication is made available through the consecutive use of an analog line and the system is easily changed for a digital line. SOLUTION: When facsimile equipment 1 connecting to an analog line and conducting G3 communication into a system for a digital line, is receiver modification 2 provided with an interface 20 which is compatible with an analog line connects to an internal bus 13 of the facsimile equipment 1 and the G4 modification 2 is connected to the digital line and G4 communication is conduced. Then a line connection section 11 of the facsimile equipment 1 is reconnected to the interface 20 to allow even the G3 communication to be conducted via the digital line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the use of the International Telecommunication Union (ITU) -T Recommendation The facsimile apparatus for performing group 3 (hereinafter referred to as G3) communication of the ITU-T Recommendation T.4 is changed to a digital line. G to perform group 4 (hereinafter referred to as G4) communication of 6
The present invention relates to a four-facsimile connection method, and more particularly to a G4 facsimile connection method capable of continuously using an analog line to perform G3 communication and easily changing to a digital line.

[0002]

2. Description of the Related Art Conventionally, a facsimile apparatus generally used is a public line (PSTN) which is an analog line.
To perform G3 communication. Such a facsimile apparatus has a built-in modem for modulating and demodulating a facsimile signal, which is digital data, into analog voice, and further has a built-in line connection unit for closing / opening a line.

In recent years, facsimile apparatuses connected to digital lines such as ISDN and performing G4 communication have begun to spread. In general, such a facsimile apparatus for G4 communication can also perform G3 communication.

[0004] When a facsimile apparatus for G4 communication is introduced, the existing facsimile apparatus for G3 communication is wasted. In order to effectively use the existing G3 communication facsimile machine, an optional device having a G4 communication function is attached to the G3 communication facsimile machine, and G4 communication is performed.
It is also considered to change to a facsimile machine for communication.

[0005]

However, the existing G3
Even when an optional device having the G4 communication function is attached to a communication facsimile device, a new ISDN is added, and a new ISDN telephone number is assigned. If the telephone number of the PSTN used in the past is to be used continuously by the ISDN, the telephone number cannot be switched immediately as the ISDN telephone number due to the exchange, and it takes a considerable period of time. After the new telephone number is used and the switching is completed, the old telephone number can be used.

[0006] Therefore, until the telephone number switching is completed, a new and unfamiliar telephone number must be used.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a G4 facsimile connection method which solves the above-mentioned problems, enables G3 communication by continuously using an analog line, and can easily be changed to a digital line.

[0008]

In order to achieve the above object, the present invention provides an interface compatible with an analog line when a facsimile apparatus connected to an analog line and performing G3 communication is changed to a digital line. G with
4 Connect the optional device to the internal bus of the facsimile device, connect the optional device to the digital line, and perform G4 communication. Then, change the line connection of the G4 facsimile device to the interface, and perform G3 communication via the digital line. It is something to do.

[0009] The interface may include a calling unit for sending a calling signal to a line connection unit of the facsimile machine, a current supply unit for sending a line current to the line connection unit, and a voice codec unit.

[0010] The line connection section of the facsimile apparatus and the interface of the G4 option apparatus may be connected by a modular cord.

[0011]

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

FIG. 1 is a wiring diagram showing a line connection when an optional device is attached to an existing G3 communication facsimile device according to the method of the present invention, and FIG. () Is a wiring diagram after the telephone number is switched. FIG. 2 is a circuit configuration diagram of the optional device and the facsimile device.

First, the circuit configuration will be described with reference to FIG.

Since the configuration of the facsimile machine 1 for G3 communication has been conventionally known, most of the configuration is omitted. Reference numeral 11 denotes a line connection unit, and reference numeral 12 denotes a modem. 13
Is an internal bus. The internal bus 13 is shared by a CPU and peripheral circuits (not shown) of the facsimile apparatus 1 and used for transmitting image data, control data, and the like. Reference numeral 14 denotes a modular terminal for connecting the line connection unit 11 to a PSTN line or an interface of an optional device. In the existing facsimile machine 1, the modular code connected to the modular terminal 14 is used by connecting to the modular terminal of the PSTN line.

The optional device 2 has an interface compatible with the PSTN line. The interface 20 includes a modular terminal 21 for connecting a modular code from the line connection unit 11 of the facsimile machine 1, a calling unit 22 for generating a calling bell voltage, a PST
A line current supply unit 23 for supplying a current equivalent to that of the N line, a transformer 24 for removing a DC component, a changeover switch 25 for switching the connection to the facsimile apparatus 1 between the calling unit side and the transformer side, and digitizing the analog voice signal,
An audio codec unit 26 converts a digital code into an analog audio signal. The interface 20 has exactly the same terminal structure, electrical characteristics, and operation sequence as those of the PSTN line.
G3 communication can be performed in the same manner as when an STN line is used.

The optional device 2 has a G4 communication function unit 30 having a G4 communication function. The G4 communication function unit 30 includes an ISDN interface unit 31 having an S interface function and a LAP-D function, a LAP-B function unit 32 having a LAP-B function, an EP-ROM 33 storing programs of optional devices, S-RAM 34 for storing data, CPU for executing programs
35, an internal bus 36 shared by these CPUs and peripheral circuits. The CPU 35 also controls the calling unit 22 and the changeover switch 24. ISDN interface 3
The first S interface function is an S point interface function, and includes a protocol processing function, a maintenance function, and an interface function. The LAP-D function controls the protocol for the ISDN D channel. This ISDN interface unit 31 is connected to an ISDN line. LAP
The -B function unit 32 performs data communication by controlling the protocol for the B channel of ISDN.

Further, the option device 2 includes a dual port RAM 40 having one port connected to the internal bus 36 of the option device 2. Optional device 2
At the time of installation, the other port of the dual port RAM 40 is connected to the internal bus 13 of the facsimile machine 1,
The dual port RAM 40 can be accessed from both the facsimile machine side and the optional machine side.

In the G4 facsimile connection method of the present invention, as shown in FIG. 1A, an existing facsimile apparatus 1 connected to a PSTN line and used for G3 communication is changed to an ISDN line. When enabling the G4 communication, the optional device 2 is attached. When the optional device 2 is mounted, the dual port RAM is connected to the internal bus 13 of the facsimile device 1 so that image data and control data can be exchanged between the facsimile device 1 and the optional device 2. The optional device 2 is connected to an ISDN line. As a result, the facsimile apparatus 1 can perform G4 communication.

If the telephone number "A" of the PSTN used in the past is to be used continuously by the ISDN, the telephone number cannot be immediately switched as the ISDN telephone number, so the modular code 5 is connected to the PSTN line. The G3 communication is performed with the old telephone number “A” using the PSTN line. A new telephone number "B" is provisionally used for ISDN, and G4 communication is performed using the new telephone number "B".

Thereafter, when the switching is completed and the telephone number of the ISDN becomes "A", as shown in FIG. 1B, the modular code 5 connecting the facsimile apparatus 1 to the PSTN line is replaced with an optional apparatus. Switch to 2.
As a result, the line connection unit 11 of the facsimile machine 1 is connected to the interface 20 of the optional device 2. Thereafter, G3 communication is also performed via the ISDN line.

As described above, from the installation of the optional device 2 to the completion of the switching, the old and familiar telephone number “A” can be used for G3 communication. Further, after the switching is completed, it is only necessary to change the connection of the modular cord 5, so that the user can easily perform this work. Note that the facsimile apparatus 1 needs to determine whether the state of the wiring is as shown in FIG. 1A or the state of FIG. 1B. A predetermined operation may be performed on the optional device 2 or an ISD
N service providers may be set.

Next, G3 before and after the telephone number switching is performed.
The operation flow of the communication and the G4 communication will be described.

As shown in FIG. 3A, the G3 transmission before the telephone number switching is performed by the facsimile apparatus 1 using the PSTN.
The line is closed, the old telephone number "A" is dialed, and when the other party is connected, handshaking is performed via the modem 12, and image data is transmitted via the modem 12. At the time of handshake, the telephone number “A” is transmitted as TSI (identification information of the source terminal), and at the time of image data transmission,
The telephone number "A" is transmitted as the TTI (source display of the document).

As shown in FIG. 3B, in the G4 transmission before the telephone number is switched, the facsimile apparatus 1 specifies the call setting to the optional apparatus 2 via the dual port RAM (DPRAM) 40, and the optional apparatus 2 Sets up a call through the ISDN interface unit 31, and when the call is established, the facsimile machine 1 transfers image data to the optional device 2 through the DPRAM 40, and the optional device 2
Transmits image data using the LAP-B function unit 32.
Bearer capability (information transfer capability) during call setup
Is unrestricted and the phone number "B" is transmitted as the calling ID,
When transmitting the image data, the telephone number “A” is transmitted as the TTI.

As shown in FIG. 4A, the G3 transmission after the telephone number switching is performed by the facsimile
The call setting is specified to the optional device 2 via the M40, the optional device 2 sets up the call by the ISDN interface unit 31, and when the call is established, the communication between the modem 12 of the facsimile device 1 and the interface 20 of the optional device 2 is performed. A handshake is performed, and image data is transmitted from the modem 12 to the interface 20 using an analog audio signal. This communication is communication performed by the facsimile apparatus 1 with respect to the optional apparatus 2, and is referred to as deemed communication. These communication contents are digitally coded by the interface 20 and transmitted by the LAP-B function unit 32 to the ISDN line. When setting up a call, the bearer capability is set to 3.1 kHz.
The telephone number “A” is transmitted as the calling ID, and the telephone number “A” is transmitted as the TTI when transmitting image data.

As shown in FIG. 4B, the G4 transmission after the telephone number switching is performed by the facsimile apparatus 1 by the DPRA.
The call setting is designated to the optional device 2 via the M40, the optional device 2 sets the call by the ISDN interface unit 31, and when the call is established, the facsimile device 2 transfers the image data to the optional device 2 via the DPRAM 40, The optional device 2 is a LAP-B function unit 32
To transmit image data. At the time of call setting, the bearer capability is not limited, and the telephone number “A” is transmitted as the calling ID, and the telephone number “A” is transmitted as the TTI at the time of transmitting image data.

Although the receiving operation is not shown, the G3 reception before the telephone number switching is performed by the line connection unit 1 of the facsimile machine 1.
1 recognizes the call, closes the PSTN line, and performs handshake and image data reception via the modem 12. G3 reception after telephone number switching is performed by the optional device 2
Recognize the call from the DN line, determine whether the data is a voice signal by the bearer capability, and in the case of the voice signal, switch the changeover switch 25 to the calling unit side to generate a calling bell voltage in the calling unit 22; When the facsimile machine 1 goes off-hook, the changeover switch 25 is switched to the transformer side to cause the calling unit 22 to stop the calling bell voltage,
The data received by the ISDN interface unit 31 is converted into an analog audio signal by the audio codec unit 26 and transmitted to the modem 12.

[0028]

The present invention exhibits the following excellent effects.

(1) The change of the device after the telephone number is switched is simple because the line connection of the facsimile device is simply connected to the interface of the optional device.

(2) Since a modular code is used,
Reconnection is easy.

(3) Since no modem is installed in the optional device, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a wiring diagram before and after telephone number switching according to the method of the present invention.

FIG. 2 is a circuit configuration diagram of an optional device and a facsimile device showing one embodiment of the present invention.

FIG. 3 is an operation flowchart of G3 transmission and G4 transmission before switching telephone numbers.

FIG. 4 is an operation flowchart of G3 transmission and G4 transmission after telephone number switching.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Facsimile apparatus 2 Optional equipment (G4 optional equipment) 5 Modular code 11 Line connection part 12 Modem 13 Internal bus 14, 21 Modular terminal 20 Interface 22 Calling part 23 Line current supply part 25 Changeover switch 26 Voice codec part

Claims (3)

[Claims] When a facsimile apparatus connected to an analog line and performing G3 communication is changed to a digital line, a G4 optional apparatus having an interface compatible with an analog line is connected to an internal bus of the facsimile apparatus. A G4 facsimile connection method, wherein an optional device is connected to a digital line to perform G4 communication, and thereafter, a line connection portion of the G4 facsimile device is connected to an interface, and G3 communication is also performed via the digital line. 2. The facsimile machine according to claim 2, wherein the interface includes a calling unit that sends a calling signal to a line connection unit of the facsimile machine, a current supply unit that sends a line current to the line connection unit, and a voice codec unit. 1. The G4 facsimile connection method according to 1. 3. The G4 facsimile connection method according to claim 1, wherein a line connection section of said facsimile apparatus and an interface of said G4 optional apparatus are connected by a modular code.