JP2003224705A - Communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication device in which a facsimile communication can be performed even when a data communication is disabled on the side of a receiver, as a communication device for carrying out a procedure specified in ITU-T recommendation V. 8 with the device of the other party and setting a picture transmission mode executable with the device of the other party on the basis of this procedure. <P>SOLUTION: The communication device for carrying out the procedure specified in the ITU-T recommendation V. 8 with the device of the other party and setting the picture transmission mode executable with the device of the other party on the basis of the procedure, has an ANSam signal transmitting means, a CM signal receiving means, a JM signal transmitting means and a control means for transmitting a JM signal in which the facsimile communication is enabled when the data communication is designated by a CM signal but there is no data receiving function. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile communication system, and in particular to ITU-T Recommendation V.3. 8 relates to a communication device capable of communication.

[0002]

2. Description of the Related Art In 1994, ITU-T Recommendation V. 8 is established, and this recommendation V.8 is established. The procedure specified in 8
It can be considered to be applied to a facsimile device and a data communication device.

The above recommendation V. When the procedure according to 8 is applied, the call function category of the CM signal and the JM signal specifies the facsimile communication or the data communication. In the CM signal modulation mode, the modulation of facsimile communication and the modulation of data communication are designated.

[0004]

Facsimile machines mainly use V.7. 34 from a device supporting V.34 communication.
8 is supported. Recently, the number of devices supporting both facsimile communication and data communication at the same time is increasing, but there are still few devices as a whole.

For example, when the number of systems in which a service provider or the like supports facsimile communication and data communication and automatically transmits received information to a partner communication destination, or without a service provider,
When the number of devices that perform data communication increases, the transmitter side may use V. I want to support the 8 procedures, and also support the facsimile communication and the data communication and execute the data communication. In the case of supporting 8 procedures but not supporting data communication but only facsimile communication, the following problems occur.

That is, the transmitter is Step C of 8
If data communication is designated in the call function category of the M signal, in this case, the receiver side cannot perform data communication, and there is a problem that communication is interrupted.

According to the present invention, the ITU-T is used to communicate with a partner device.
Recommendation V. In the communication device that executes the procedure specified in 8 and sets the image transmission mode that can be executed with the other party device based on this procedure, even if the receiver side cannot perform the data communication, the facsimile communication is performed. It is an object of the present invention to provide a communication device capable of performing the above.

[0008]

According to the present invention, the ITU-T Recommendation V.50 is used with a partner device. In the communication device that executes the procedure defined in No. 8 and sets the image transmission mode that can be executed with the partner apparatus based on the above procedure,
The Sam signal transmitting means, the CM signal receiving means, the JM signal transmitting means, and the data communication are designated by the CM signal, but if there is no data receiving function, the control means for transmitting the JM signal that enables the facsimile communication. It is a communication device having.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION First of all, V. 1 which is recommended by ITU-T is recommended. The procedure signal 8 will be described.

V. The procedure signal of 8 includes a calling menu signal (hereinafter referred to as “CM”) and a CM terminator (hereinafter referred to as “C”).
"J") and a common menu signal (hereinafter referred to as "JM").

The CM is a signal transmitted from the calling DCE and is mainly used to indicate the modulation schemes available in the calling DEC. The low-frequency channel V. 300 bit / modulated by 21 (L)
It is composed of s repeated bit strings.

CJ is a signal indicating confirmation of detection of JM and end of CM, and V.S. of 300 bit / s. 21
Modulated by (L), start bit / s and stop b
It is composed of all three consecutive "0" octets including it / s.

JM is a signal transmitted from the response DEC, which is mainly used to indicate the available modulation schemes common to the calling and response DECs, and is recommended by V.6. The high-frequency channel V. 3 modulated by 21 (H)
It is composed of a repeated bit string of 00 bit / s.

Next, the coding formats of the CM, CJ, and JM signals will be described.

FIG. 7 shows ITU-T Recommendation V.38. It is a figure which shows the structure of the preamble contained in the procedure signal of FIG.

A common coding format is used for CM, CJ, JM, and each signal CM, CJ, JM is composed of a repeating bit sequence. As shown in FIG. 7, one sequence is initially composed of ten "1" s, a 10-bit synchronization code following the sequence, and an octet carrying further information. Each octet has a leading start bit ("0")
And a subsequent stop bit (“1”) are added.

The same V. Recommendation T.21 using H.21 (H) modulation. In order to avoid confusion with 30, the bit constrains are coded such that the HDLC flag (01111110) never appears.

Each octet belongs to a certain information category. This coding format allows the information categories to be extended for special applications if the simplicity of the signal is preserved by the majority of applications.

The first category of information in a sequence must be the calling function. The order is unspecified in the information categories that follow it. All information in a category is conveyed in one octet, or one ordered octet sequence if necessary.

Next, the category octet will be described.

FIG. 8 shows the ITU-T Recommendation V.38. FIG. 8 shows a form of category octets that determines the information category of the procedure signal of FIG.

The category octet is the first octet generated in a new information category, and includes a 4-bit code that determines the information category.

This format is structured as follows, with the displayed bits being transmitted in left-to-right order.

Start bit (0) b0 b1 b2 0 1 0 b6 b7 Stop bit (1) Bits b0 to b3 form a category in which b0 is the least significant bit, and bit b4 is, as shown in FIG. It is set to "0" so that the flag does not hold, and b5 to b7 are
It is an option bit of the information category.

Any number of extended octets can immediately follow the category octet if there is a shortage when representing a particular category with three option bits.

The format of this extended octet is configured as shown below.

Start bit (0) b0 b1 b2 0 1 0 b6 b7 Stop bit (1) Bits b0 to b2, b6, and b7 are five bits added to the category at that time. Bit b4 is used to distinguish extended octets from category octets,
It is set to "1" and b3 and b5 are set to "0" so that the flags are not established.

Next, the calling function, the modulation mode, the protocol, and the G which are the information categories determined by the bits b0 to b3.
STN access will be described.

FIG. 9 is a diagram showing a usage example of bits of the calling function category (call function category).

The three option bits in the calling function category (call function category) are used to specify a specific calling function, as shown in FIG.

FIG. 10 shows ITU-T Recommendation V.38. It is a figure which shows the modulation mode (modulation mode) designated by the procedure signal of 8.

The V-series modulation mode (modulation mode) that can be used in the GSTN is designated by three symbols as shown in FIG. The Enabled setting is only if, within the displayed calling function, the modulation mode is available and wants to convey its capabilities to the remote DCE.

FIG. 11 shows ITU-T Recommendation V.38. It is a figure showing the code | symbol list inside the protocol category of the procedure signal of 8.

The code list inside the protocol category is shown in FIG. If the LAPM protocol code is indicated by CM and the responding DCE side receiving it also wants to use LAPM, the protocol octet indicating LAPM is also displayed in JM.

FIG. 12 shows ITU-T Recommendation V.38. 9 is a diagram illustrating a code indicating a cellular access for connecting to the GSTN of the procedure signal of FIG.

The symbols indicating cellular access to the GSTN are shown in FIG.

Next, V. The information bits of INFO0 defined in 34 will be described.

FIG. 13 is a diagram showing V.V. according to the ITU-T recommendation. 34
It is a figure which shows the bit definition of the INFO0 sequence of.

INFO0 is a signal used to indicate the transmission capability, and the bits of the signal sequence are defined as shown in FIG.

In the present embodiment, INFO0a is a signal sent from the called side, and INFO0c is a signal sent from the calling side.

[First Embodiment] FIG. 1 is a block diagram showing the configuration of a facsimile apparatus FS1 according to the first embodiment of the present invention.

The facsimile apparatus FS1 has a telephone line 2a.
Network control unit (hereinafter referred to as NCU) connected to
2 is provided. In order to use the telephone network for data communication, the NCU 2 controls the connection of the telephone exchange network such as connecting to a line terminal, switches to the data communication path, connects the telephone line 2a and the telephone 4, and connects the telephone. The connection between the line 2a and the hybrid circuit 6 is selectively switched.

The NCU 2 and the telephone 4 are connected by the signal line 2b, and the NCU 2 and the hybrid circuit 6 are connected by the signal line 2
It is connected by c. The switching operation of the NCU 2 is controlled by the control circuit 20 described later.

If the control signal supplied from the control circuit 20 through the signal line 20a is "0", the telephone line 2a and the telephone 4 are connected, and if the control signal is "1", the telephone line 2a is connected. And the hybrid circuit 6 are connected. In the normal state, the telephone line 2a and the telephone 4 are connected.

The hybrid circuit 6 receives the transmission signal from the transmission system transmitted via the telephone line 2a and the telephone line 2a.
It separates from the received signal to the receiving system received via.
The transmission system includes an image pickup device such as a CCD (electrically coupled device), a reading circuit 14 configured by an optical system, and an ANSam sending circuit 10.

The reading circuit 14 sequentially reads an image of one line in the main scanning direction from the transmission original, and outputs data indicating the read image to the signal line 14a.

The ANSam transmission circuit 10 uses the signal line 20d.
When a signal of level "1" is applied from the control circuit 20 via the, the ANSam signal is output to the signal line 10a.
On the other hand, when a signal of level "0" is given from the control circuit 20 via the signal line 20d, the ANSam signal is not output to the signal line 10a.

The data output from the reading circuit 14 via the signal line 14a is given to the control circuit 20. The control circuit 20 performs an encoding process on the data taken in via the signal line 14a, and the encoded data is output to the modulator / demodulator 8 via the signal line 20b.

The modulator / demodulator 8 performs modulation processing on the encoded data from the signal line 20b to generate a modulation signal, and also demodulates the received signal taken in from the hybrid circuit 6 via the signal line 6a. Then, the demodulated data is generated. The modulation process and the demodulation process are the same as those described in ITU-T Recommendation V.3. 8, V.I. 21, V.I. 27 ter, V.I. 29, V.I. 1
7, V.I. 34. The content of the modulation / demodulation processing by the modulator / demodulator 8 is instructed by a signal given from the control circuit 20 through the signal line 20c, and the transmission mode is determined by the instructed modulation / demodulation processing.

The modulated signal generated by the modulator / demodulator 8 is given to the adder circuit 12 via the signal line 8a. The adder circuit 12 adds the modulated signal from the modulator / demodulator 8 and the ANSam signal from the ANSam sending circuit 10. The added signal is output to the hybrid circuit 6 via the signal line 12a, and the hybrid circuit 6 sends the added signal via the NCU 2 as a transmission signal to the telephone line 2
Send to a.

On the other hand, in the receiving system, the signal received from the partner device via the NCU 2 is output from the hybrid circuit 6 to the modulator / demodulator 8 via the signal line 6a. The modulator / demodulator 8 performs demodulation processing on the received signal taken in via the signal line 6a as described above, and generates demodulated data. The demodulated data generated by the modulator / demodulator 8 is supplied to the control circuit 20 via the signal line 8b. The control circuit 20 performs processing such as decoding on the demodulated data, and the decoded data is given to the recording circuit 16 via the signal line 20e.

The recording circuit 16 sequentially records the image indicated by the decoded data on recording paper line by line.

The data read by the reading circuit 14, the data obtained by encoding the data, the received data, and the data obtained by decoding the data are stored in the memory circuit 1 as necessary.
8 is stored.

The control circuit 20 receives information from the other party's device and controls transmission to transmit the information to the other party's device.

The transmission control procedure that defines this transmission control includes ITU-T Recommendation V.34. 8, V.I. 21, V.I. 27te
r, V. 29, V.I. 17, V.I. Each of the 34 fax procedures is used.

Specifically, the ITU-
Recommendation V.T. In the communication method of executing the procedure defined in No. 8 and setting the image transmission mode executable with the other party device based on the procedure, an ANSam signal transmitting means, a CM signal receiving means, a JM signal transmitting Have means, CM
The data communication is designated by the signal, but if the data receiving function is not provided, the JM signal that enables the facsimile communication is transmitted. Here, designation of data communication is executed in the call function category of the CM signal.

Next, the operation of the above embodiment will be described.

2, FIG. 3, and FIG. 4 are facsimile machines F.
It is a flow chart which shows operation of S1.

In S2, a signal of level "0" is output to the signal line 20a, CML is turned off, and in S4, the signal line 20a.
By outputting a signal of level "0" to d, AN
It is set not to output the Sam signal.

In S6, it is determined whether or not the incoming call is selected. If the incoming call is not selected, step S8 is executed,
When the incoming call is selected, step S10 is executed.

In S8, other processing is executed, and after executing the other processing, the process returns to step S2.

At S10, the level "1" is applied to the signal line 20a.
Signal is output, CML is turned on, the timer T1 is set to 35 seconds in S12, the FLG is set to 0 in S14, the timer is set to 5 seconds in S16, and S18 is set.
Then, by setting the level "1" signal to the signal line 20d, the ANSam signal is set to be output.

In S20, it is determined whether or not the CM signal is received. If the CM signal is received, the process proceeds to step S24. If the CM signal is not received, the step S22 is performed.
Proceed to.

In S22, it is determined whether or not the timer has timed out. If the timer has timed out, the process proceeds to step S42. If the timer has not timed out, the process proceeds to step S18.

At S24, it is determined whether or not the data communication is designated by the call function category of the CM signal. If the data communication is designated by the call function category of the CM signal, the process proceeds to step S26, and C
If data communication is not designated in the call function category of the M signal, the process proceeds to step S32.

At S26, a JM signal is transmitted, where
Specify FAX communication in the call function category,
Also, specify the modulation function of the player in the modulation mode.

In S28, the CJ signal is received, and in S30, the V.V. 34 Communicates the control channel of half-duplex facsimile communication and receives the primary channel.

In S32, the JM signal is transmitted, where
Specify FAX communication in the call function category,
Further, the modulation mode is designated as being a CM signal, and further, the modulation function of the own device is designated.

In S34, the transmitter is the V. 34 half-duplex facsimile communication is determined, and V.34 half-duplex facsimile communication is possible. 34
If half-duplex facsimile communication is possible, step S2
Proceed to V.8. If the 34 half-duplex facsimile communication is not possible, the process proceeds to step S36.

In S36, the CJ signal is received, and in S38, the V.V. 21 DIS signal, where V.21 is transmitted. Notify that there is no reception function of 8.

In S40, the V. 21. V.21.
27ter or V.I. 29, or V.I. The image signal of 17 is received.

In S42, it is determined whether FLG is 0. If FLG is 0, the process proceeds to step S44 and F
If LG is not 0, the process proceeds to step S38.

In S44, the V. 21 DIS signal, where V.21 is transmitted. 8 that the reception function is present, the timer T4 is set to 3 seconds in S45, and the FLG is set in S46.
Set 1 to.

In S48, it is determined whether or not the CI signal is received. If the CI signal is received, the process proceeds to step S16. If the CI signal is not received, the step S50 is performed.
Proceed to.

In S50, the V. No. 21 signal determines whether a DCS signal is received, and the V.21 signal is received. If the DCS signal is received as the V.21 signal, the process proceeds to step S40 and the V. If the DCS signal is not received with 21 signals, the process proceeds to step S52.

In S52, it is determined whether or not the timer T4 has timed out. If the timer T4 has timed out, the process proceeds to step S54. If the timer T4 has not timed out, the process proceeds to step S48.

In S54, it is determined whether or not the timer T1 has timed out. If the timer T1 has timed out, the process proceeds to step S2. If the timer T1 has not timed out, the process proceeds to step S44.

Next, the transmission control procedure will be described.

FIG. 5 is a diagram showing an example of a transmission control procedure applied to the facsimile apparatus FS1.

First, after receiving the ANSam signal from the called terminal, the V.V. 34, the transmission control procedure until the image transmission is executed will be described.

Referring to FIG. 5, a signal that enables full-duplex communication (ANSam signal at 2100 Hz for 15 H)
The signal modulated by z) is transmitted from the called terminal. From the calling side, V. A CM signal by modulation based on 8 is transmitted, and the CM signal (here, data communication is designated by the call function category) notifies the called terminal of a transmission mode that can be executed at the time of image transmission.

The called terminal that has received the CM signal notifies the calling terminal of the receivable transmission mode among the transmission modes specified by the CM signal. As this notification, JM (here,
Facsimile communication is designated in the call function category. In addition, V. 34 half duplex, V.I. 27ter,
V. 29 half duplex, V.I. 17 communication is specified in modulation mode) signal is used.

The calling terminal which has received the JM signal notifies the called terminal of the transmission mode by transmitting the CJ signal.

After transmitting the CJ signal, that is, V. 8
After 50 msec has passed from the completion of the procedure, the calling terminal
V. 34. Execution of the procedure is started, and a line probing signal (IN at the beginning
FO0c is added). The called terminal is
A signal in response to the line probing signal from the calling terminal (a signal with INFO0a added at the beginning) is sent, and this signal notifies the calling terminal of subsequent sending level, amplitude level correction, and transmission baud rate. .

The calling terminal sends a long training signal after 50 msec has passed after sending the line probing signal, and the called terminal adjusts the equalizer of the modem based on the long training signal. Perform timing detection, etc.

The calling terminal sends a parameter exchange signal after 50 msec has passed after sending the long training signal. The called terminal sends a signal in response to the parameter exchange signal, and notifies the calling terminal of subsequent link correction and bit rate by this signal.

After responding to the parameter exchange signal, the called terminal sends out CSI and DIS signals, and the calling terminal sends TS.
Until the I and DCS signals are received, the flag is sent and TS
After receiving the I and DCS signals, the CFR signal is transmitted. The calling terminal, after receiving the CSI and DIS signals,
The TSI and DCS signals are transmitted, and the flag is transmitted until the CFR signal is received from the called terminal.

The calling terminal 50m after sending the flag
After the lapse of sec, V. The image transmission by 34 is started, and the image signal is transmitted. 50 mse after sending the image signal
After the lapse of c. 34, the calling terminal sends out a PPS-MPS signal, and the called terminal receives M
The flag is sent until the CF signal is received. The called terminal sends out the MCF signal after receiving the PPS-MPS signal.

After 50 msec has passed from the transmission of the flag, V. The image transmission by 34 is executed, and the image signal is again sent from the calling terminal. When 50 msec has elapsed after the transmission of the image signal was completed, the V. 34, the calling terminal sends a PPS-EOP signal,
The flag is sent out until the MCF signal is received. The called terminal sends out the MCF signal after receiving the PPS-EOP signal. After that, the same procedure is repeated until the end of image transmission.

[Second Embodiment] In the second embodiment of the present invention, facsimile communication is possible when the presence of the modulation function of facsimile communication is designated in the CM signal modulation mode in the first embodiment. This is an example in which the line is disconnected when the JM signal is transmitted and the absence of the modulation function of the facsimile communication is designated in the modulation mode of the CM signal.

FIG. 6 is a flow chart showing the operation of the second embodiment of the present invention.

In FIG. 6, only the control of the part different from the flowcharts shown in FIGS. 2 to 4 is shown.

S60 represents NO in step S24,
In S62, FA is set in the CM signal modulation mode.
It is determined whether or not the X communication modulation function is specified, and F is set in the CM signal modulation mode.
If the AX communication modulation function is specified, the process proceeds to step S64 (S32). If the FAX communication modulation function is not specified in the CM signal modulation mode, step S66 (S).
Proceed to 2).

Next, the above transmission control procedure will be described.

FIG. 14 is a facsimile device F shown in FIG.
It is a figure which shows an example of the transmission control procedure applied to S1.

From the called terminal, a signal that enables full-duplex communication (ANSam signal, which is a signal obtained by modulating 2100 Hz at 15 Hz) is transmitted. From the calling side, V. A CM signal by modulation based on 8 is transmitted, and the CM signal (here, data communication is designated by the call function category) notifies the called terminal of a transmission mode that can be executed at the time of image transmission.

The following cases (1) to (4) can be specified as the modulation mode by the CM signal. In the modulation mode, V.
34 half-duplex communication is possible, and the case of
V. 34 half-duplex communication is impossible, and 17, or
V. 29 half-duplex or V.29. 27ter communication is possible, and the case is V.27. 34 half duplex, V.I. 1
7, V.I. 29 half duplex, V.I. This is a case where all 27ter communication is impossible.

In the case of (1), the called terminal that has received the CM signal notifies the calling terminal of the receivable transmission mode among the transmission modes designated by the CM signal, and the JM
(Here, facsimile communication is specified in the call function category, and it is specified that V.34 half-duplex, V.27ter, V.29 half-duplex, and V.17 communication are all possible in the modulation mode. Signal) is used.

The calling terminal which has received the JM signal notifies the called terminal of the transmission mode by transmitting the CJ signal.

After transmitting the CJ signal, that is, V. 8
After 50 msec has passed from the completion of the procedure, the calling terminal determines that 34, the execution of the procedure is started, and a line probing signal (a signal having INFO0c added at the beginning) for checking the status of the telephone line 2a is transmitted.
The called terminal sends a signal in response to the line probing signal from the calling terminal (a signal with INFO0a added at the beginning), and this signal causes the subsequent sending level,
The correction of the amplitude level and the transmission baud rate are notified to the calling terminal.

The calling terminal sends a long training signal after 50 msec has passed after sending the line proving signal, and the called terminal adjusts the equalizer of the modem based on the long training signal. Perform timing detection, etc.

Thereafter, the same operation as that shown in FIG. 5 is executed.

In the case of (1), the called terminal receiving the CM signal notifies the calling terminal of the receivable transmission mode among the transmission modes designated by the CM signal, and the JM
(Here, facsimile communication is specified in the call function category, and CM in V.27ter, V.29 half-duplex, and V.17 in modulation mode.
A signal is used to specify that communication is possible and the specified modulation is used for the signal.

The calling terminal which has received the JM signal notifies the called terminal of the transmission mode by transmitting the CJ signal.

When the called terminal receives the JM signal,
21 procedures NSF / CSI / DIS signal (here, DI
S. signal for V. 8) Send a signal indicating that there is no reception function. Corresponding to this signal, the calling terminal sends NSS / TSI /
A DCS signal is transmitted, followed by a training check signal to determine the velocity, V.D. Image transmission by 17 is executed.

In the case of, the called terminal immediately disconnects the line.

[0107]

According to the first and second aspects of the invention, the transmitter is Even if data communication is specified in the CM signal call function category of the procedure in 8, and the receiver side cannot perform data communication, the facsimile communication is specified in the JM signal call function category, and then,
If the transmitter side executes the facsimile communication, the facsimile communication becomes possible, and the information communication becomes possible for the user, which is advantageous in that it is easy to use.

According to the third and fourth aspects of the invention, the transmitter is Even if the data communication is specified in the CM signal call function category of the procedure in 8 and the receiver side cannot perform data communication, when the CM communication modulation mode is specified to have the facsimile communication modulation function, the JM signal is specified. In the call function category of, if the facsimile communication is designated and then the transmitter side executes the facsimile communication, the facsimile communication becomes possible, and the information communication becomes possible for the user, which is easy to use. The machine is V. In the call function category of the CM signal of the procedure according to 8,
Even if the data communication is specified and the receiver cannot perform data communication, when the CM communication modulation mode is set to specify no facsimile communication modulation function, the line is disconnected immediately and there is no wasteful line capture. Thus, there is an effect that the user does not have to increase the communication cost and is easy to use.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a facsimile apparatus FS1 which is a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the facsimile apparatus FS1.

FIG. 3 is a flowchart showing an operation of the facsimile apparatus FS1.

FIG. 4 is a flowchart showing an operation of the facsimile device FS1.

FIG. 5 is a diagram showing an example of a transmission control procedure applied to the facsimile apparatus FS1.

FIG. 6 is a flowchart showing an operation of the second embodiment of the present invention, and is a flowchart showing only a part different from the flowcharts shown in FIGS.

FIG. 7: ITU-T Recommendation V.3 It is a figure which shows the structure of the preamble contained in the procedure signal of FIG.

FIG. 8 ITU-T Recommendation V. FIG. 8 shows a form of category octets that determines the information category of the procedure signal of FIG.

FIG. 9 is a diagram illustrating a usage example of bits of a calling function category (call function category).

FIG. 10: ITU-T Recommendation V.3 It is a figure which shows the modulation mode (modulation mode) designated by the procedure signal of 8.

FIG. 11 ITU-T Recommendation V.3 It is a figure showing the code | symbol list inside the protocol category of the procedure signal of 8.

FIG. 12: ITU-T Recommendation V.3 8 Procedure signal GSTN
FIG. 5 is a diagram illustrating a code indicating a cellular access to be connected to a mobile station.

FIG. 13 is a diagram showing V. 1 according to ITU-T recommendation. 34 INFO0
It is a figure which shows the bit definition of a sequence.

FIG. 14 is a diagram showing an example of a transmission control procedure applied to the facsimile apparatus FS1.

[Explanation of symbols]

FS1 ... Facsimile device, 6 ... hybrid circuit, 8 ... Modem, 10 ... ANSam sending circuit, 14 ... reading circuit, 16 ... Recording circuit, 20 ... Control circuit.

Claims (4)

[Claims] 1. An ITU-T Recommendation V.2 is provided between the device and a partner device. In the communication device for executing the procedure defined in No. 8 and setting the image transmission mode executable with the destination apparatus based on the procedure, an ANSam signal transmitting means; a CM signal receiving means;
A communication device comprising: a signal transmitting unit; and a control unit for transmitting a JM signal that enables facsimile communication if the data communication is designated by the CM signal but the data receiving function is not provided. 2. The communication device according to claim 1, wherein data communication is designated by the call function category of the CM signal. 3. The method according to claim 1 or 2, wherein, in the modulation mode of the CM signal, the presence of a modulation function for facsimile communication is designated,
A communication device, which transmits a JM signal capable of facsimile communication. 4. The method according to claim 1, wherein no modulation function for facsimile communication is designated in the CM signal modulation mode,
A communication device characterized by disconnecting the line.