JP2003219129A - Communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication apparatus capable of data communicating even when a receiver side cannot conduct a facsimile communication in the apparatus, in which a sequence specified in an ITU-T recommendation V.8 is executed to a third-party apparatus and a picture transmission mode executable to this third-party apparatus is set based on the sequence. <P>SOLUTION: The communication apparatus executes the sequence specified in the ITU-T recommendation V.8 to the third-party apparatus, and sets the picture transmission mode executable to the third-party apparatus based on this sequence. The apparatus comprises an ANSam signal transmission means, a CM signal receiving means, and a JM signal transmission means. In this apparatus, the facsimile communication is designated according to a CM signal, but if there is no facsimile receiving function, the apparatus transmits a JM signal capable of data communicating. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a data communication system,
In particular, ITU-T Recommendation V. The present invention relates to a data communication device capable of performing eight communications.

[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 perform facsimile communication by supporting facsimile communication and data communication by supporting the V.8 procedure. The following problems occur in the case of supporting 8 procedures but not supporting facsimile communication but only data communication.

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

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, the data communication is performed even if the receiver side cannot perform the facsimile communication. It is an object of the present invention to provide a communication device capable of performing the above.

[0008]

According to the present invention, ITU-T Recommendation V.50 is established with a partner device. In the communication device that executes the procedure defined in 8 and sets the image transmission mode that can be executed with the partner apparatus based on this procedure,
A communication device that has a Sam signal transmitting means, a CM signal receiving means, and a JM signal transmitting means, and data transmission is possible if the facsimile communication is designated by the CM signal but the facsimile receiving function is not provided. is there.

[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 b
2 0 1 0 b6 b7 Stop bit (1) Bits b0 to b3 form a category with b0 as the least significant bit, as shown in FIG. 8, and bit b4 is set to "0" so that the flag is not established. Is set, 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 b
2 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 a configuration of a communication device CS1 according to a first embodiment of the present invention.

The communication device CS1 includes a network control device (hereinafter referred to as NCU) 2 connected to the telephone line 2a. The NCU 2 controls the connection of the telephone switching network such as connecting to a line terminal in order to use the telephone network for data communication.
Switching to the data communication path, telephone line 2a and telephone 4
And the connection between the telephone line 2b and the hybrid circuit 6 are 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. 22 bis / V. 22, V.I. 23 full duplex,
V. 32 bis / V. 32, V.I. 34 based on full duplex. The contents of the modulation and demodulation processing by the modulator / demodulator 8 are
It 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 and 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. 22 bis / V. Two
2, V. 23, V.I. 32 bis / V. 32, V.I. Each of the 34 half-duplex communication 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
Facsimile communication is specified by the signal, but data communication is possible if there is no facsimile reception function.
Transmit M signal. Here, the facsimile communication is designated in the call function category of the CM signal.

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

2, 3, and 4 are flowcharts showing the operation of the communication device CS1.

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.
, The CML is turned on, the timer is set to 35 seconds in S12, the ANSam timer is set to 5 seconds in S14, and the signal of level "1" is output to the signal line 20d in S16. Therefore, it is set to output the ANSam signal.

In S18, it is judged whether or not the CM signal is received. If the CM signal is received, the process proceeds to step S22. If the CM signal is not received, the step S20 is performed.
Proceed to.

In step S20, it is determined whether or not the ANSam timer has timed out. If the ANSam timer has timed out, the process proceeds to step S2. If the ANSam timer has not timed out, the process proceeds to step S16.

In S22, the communication designation in the call function category of the CM signal is judged. If the data communication is designated, the process proceeds to step S24. If the facsimile communication is designated, the process proceeds to step S30.

In S24, the JM signal is transmitted, where
In the call function category, data communication is designated, the modulation mode is designated as a CM signal, and the modulation function (V.22bis / V.22, V.23 full duplex, V. ．
32 bis / V. 32, V.I. 34 full duplex).

In S26, the CJ signal is received, in S28, the data communication is executed, in S30, the JM signal is transmitted, the data communication is designated by the call function category, and in the modulation mode Modulation function (V.22bis / V.2)
2, V. 23 full duplex, V.I. 32 bis / V. 32, V.I.
34 full duplex).

In S32, the CJ signal is received. In S34, it is determined whether or not the line probing signal from the calling terminal is received. If the line probing signal from the calling terminal is received, step S36 is performed. If the line probing signal from the calling terminal is not received, the process proceeds to step S2.

Next, the transmission control procedure will be described.

FIG. 5 is a diagram showing an example of a transmission control procedure applied to the communication device CS1.

First, the transmission control procedure from the reception of the ANSam signal from the called terminal to the execution of data communication will be described.

Referring to FIG. 5, a signal enabling 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 this CM signal (here, it is considered that data communication is designated by the call function category and FAX communication is designated) is executed at the time of image transmission. The possible transmission modes are notified to the called terminal.

Upon receiving the CM signal, the called terminal notifies the calling terminal of a receivable transmission mode among the transmission modes designated by the CM signal, and as the notification, JM (here,
In the call function category, data communication is specified regardless of the communication specification in the call function of the calling terminal. In addition, V. 22 bis / V. 22, V.I. Two
3 full duplex, V.I. 32 bis / V. 32, V.I. 34 full-duplex 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 sending the CJ signal, that is, V. 8
After 50 msec has passed from the completion of the procedure, the calling terminal
V. 34 The execution of the full-duplex procedure is started, and a line probing signal (INFO0c is added at the beginning) for checking the status of the telephone line 2a is transmitted. The called terminal sends out a signal in response to the line probing signal from the calling terminal (a signal with INFO0a added at the beginning), and by using this signal, the sending level, amplitude level correction, and transmission baud rate thereafter are issued. Notify the call terminal.

Then, similarly to the above, a line probing signal is transmitted from the called terminal.

After that, transmission / reception of long training is executed, parameter exchange is executed, and full-duplex data communication of the primary channel signal is executed.

[Second Embodiment] In the second embodiment of the present invention, data communication is possible when the modulation function for data communication is designated in the CM signal modulation mode in the first embodiment. JM signal (modulation mode is designated as a CM signal, and the modulation function (V.22b)
is / V. 22, V.I. 23 full duplex, V.I. 32bis /
V. 32, V.I. 34 full-duplex) is transmitted, and the line is disconnected when the modulation function of the CM signal is used and no data communication modulation function is specified.

FIG. 6 is a flow chart showing the operation of the second embodiment of the present invention, and is a flow chart showing only parts different from the flow charts shown in FIGS.

In FIG. 6, S40 is step S22.
Represents the FAX communication designation, and in S42, it is determined whether or not the modulation function of the data communication is designated in the modulation mode of the CM signal. If the modulation function is designated, step S46.
The process proceeds to (S24), and if the modulation function is not designated, the process proceeds to step S44 (S2).

Next, the transmission control procedure in the second embodiment will be described with reference to FIG.

In FIG. 5, when FAX communication is designated by the category of the call function of the CM signal, the following first and second designations can be considered as the modulation modes. The first designation is a designation in the modulation mode with the data communication modulation function, and the second designation is a designation in the modulation mode without the data communication modulation function.

In the first designation, the called terminal which has received the CM signal notifies the calling terminal of the receivable transmission mode among the transmission modes designated by the CM signal by the JM signal. Specifically, data communication is designated in the call function category. In addition, the modulation mode is designated as being a CM signal, and the modulation function (V.22bis / V.22,
V. 23 full duplex, V.I. 32 bis / V. 32, V.I. 34
Full duplex) is specified.

Thereafter, data communication based on FIG. 5 is executed.

In the second designation, the called terminal immediately disconnects the line.

[0086]

According to the first and second aspects of the invention, the transmitter is Even if the facsimile communication is specified in the CM signal call function category of the procedure according to 8, and the receiver side is not able to perform facsimile communication, the JM signal call function category is specified in the data communication, and then the transmitter side transmits the data. When the communication is executed, the data communication becomes possible, and the information communication becomes possible for the user, and it is easy to use.

According to the inventions of claims 3 and 4, the transmitter is Even if the facsimile communication is specified in the call function category of the CM signal in the procedure of 8 and the receiver side cannot perform the facsimile communication, when the data communication modulation function is specified in the CM signal modulation mode, the JM signal is specified. If the data communication is specified in the call function category of, and then the transmitter executes the data communication, the data communication becomes possible, and the information communication becomes possible for the user, which is easy to use. The machine is V. Step C of 8
In the call function category of the M signal, even if the facsimile communication is specified and the receiver cannot perform the facsimile communication, the line is disconnected immediately when the data communication modulation function is not specified in the CM signal modulation mode. Therefore, there is no wasteful line capture, and there is an effect that the user does not have to increase communication costs and is easy to use.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a communication device CS1 which is a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the communication device CS1.

FIG. 3 is a flowchart showing an operation of the communication device CS1.

FIG. 4 is a flowchart showing an operation of the communication device CS1.

FIG. 5 is a diagram showing an example of a transmission control procedure applied to the communication device CS1.

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.

[Explanation of symbols]

CS1 ... communication 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 data communication if facsimile communication is designated by a CM signal but a facsimile receiving function is not provided. 2. The communication device according to claim 1, wherein facsimile communication is designated by the call function category of the CM signal. 3. The JM signal according to claim 1 or 2, wherein, in the modulation mode of the CM signal, a data communication modulation function is specified, and when specified, a JM signal that enables data communication is transmitted. Communication device. 4. The communication according to any one of claims 1 to 3, characterized in that, when no modulation function for data communication is specified in the CM signal modulation mode, the line is disconnected. apparatus.