JP2000295365A - Data communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute V.34 communication through a private branch exchange without problem by preventing the PBX from performing band compression by sending an identification signal capable of recognizing facsimile communication at the time of call origination. SOLUTION: A modem 9 of a digital compound machine on a caller side sends out an identification signal (CED signal) capable of recognizing facsimile communication at the time of call origination and call termination. From this CED signal, each private branch exchange in each office judges that communication is facsimile communication and does not perform band compression. When the facsimile equipment in the office on a caller side is equipment having a V.34 communication function, in response to call incoming, a procedure V.8 is started and an ANSam signal is sent out. When this ANSam signal is received, the digital compound machine on the caller side executes the V.8 procedure as the procedure of fully duplex communication and afterwards, the procedure of V.34 and the transmission of image signals based on V.34 are performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication apparatus such as a facsimile apparatus, and more particularly to a data communication apparatus for transmitting and receiving a procedure signal by full-duplex communication.

[0002]

2. Description of the Related Art Today, facsimile communication has become widespread, and the amount of facsimile communication between companies inside and outside the company has been increasing. Therefore, in addition to directly using the general public network, a private branch exchange is provided in the same manner as a telephone, and facsimile communication inside and outside the company is being performed via the private branch exchange.

FIG. 8 shows a telephone / facsimile communication system including such facsimile communication. Originally, the communication system is composed of a number of business establishments, but here, for convenience, a description will be given of the configuration of business establishment A and business establishment B.

In the communication system, a number of facsimile machines (FAX) 51A ... and telephones (TEL) 50A ... in business A are connected to a private branch exchange 52A in business A, and many facsimile devices 51B in business B.
… And the telephone 50B… are the private branch exchange 52B of the B office.
It is connected to the. The private branch exchanges 52A and 52B of these offices A and B are connected by a dedicated line and also connected to a public network exchange 54 via a public line.
Connected to the public telephone network. Office A also has a facsimile apparatus 51A directly connected to the public network exchange 54 via a public line without being connected to the private branch exchange 52A.

[0005] In such a communication system, there are the following three methods for facsimile communication from establishment A to establishment B. The facsimile machine 51A, which is not connected to the private branch exchange 52B of the office A, transmits directly to the private branch exchange 52B of the office B via the public network exchange 54, and transmits to the facsimile apparatus 51B of the office B via the private branch exchange 52B. Method.

[0006] From the facsimile machine 51A connected to the private branch exchange 52A of the office A, the private branch exchange 52
A method of transmitting the data to the private branch exchange 52B of the business B via the public network exchange 54 via the private network exchange 54, and transmitting the data to the facsimile apparatus 51B of the business B via the private branch exchange 52B.

[0007] From the facsimile machine 51A connected to the private branch exchange 52A of the office A, the private branch exchange 52
Private branch exchange 5 at B office directly via dedicated line via A
A method of transmitting to the facsimile device 51B of the B office connected to 2B. This method does not go through the general public network.

[0008] Recently, a facsimile apparatus capable of connecting two lines has been used. In such a facsimile machine, one line can be connected to a public line, and the other line can be connected to a dedicated line via a private branch exchange.

By the way, the private branch exchanges 52A.5
In 2B, in order to effectively utilize the bandwidth of a line (dedicated line and public line) to increase the number of communications, it is determined whether the communication is a telephone or facsimile communication. It has become. Conventionally, private branch exchange 5
In 2A / 52B, the determination as to whether the communication is telephone or facsimile communication is made based on the presence or absence of a CED signal transmitted from the called facsimile machine in response to the incoming call.

FIG. 9A shows a response with a CED signal.
7 shows an example of a communication sequence in conventional facsimile communication. Here, the procedure signal for setting the communication mode and the like is transmitted and received by half-duplex communication.

As can be seen from the figure, the called-side facsimile apparatus first responds with a CED signal indicating that the communication is facsimile communication. 2
A NSF signal, a CSI signal, and a DIS signal of one procedure are transmitted. 27ter, V.I. 29, V.I. 17 image transmission is executed.

On the other hand, according to the ITU-T recommendation, in order to reduce the communication time, a procedure signal which has been transmitted / received by half-duplex communication in the related art is transmitted by full-duplex communication. 34 communications have been standardized.

FIG. 9 (b) shows a procedure for transmitting / receiving a procedure signal by full-duplex communication. 34 shows a communication sequence example of 34 communication.
V. In the case of communication, the V.34 communication is performed when a call is received. 8 responds with an ANSam signal indicating that there are 8 procedures. V.34 communication function. 8 procedure, and then Step 34 and image transmission are executed.

On the other hand, if the calling side is V. If the communication side does not have the communication function, no response is made to the ANSam signal, and the called side performs the V.34 of the half-duplex communication shown in FIG. Then, the process proceeds to the transmission of the DIS signal in the V.21 procedure. 21
Procedure, V.E. 27ter, V.I. 29, V.I. 17 image transmission is executed.

[0015]

However, the facsimile communication becomes impossible or the communication speed becomes slow with the above-mentioned conventional technique, and V.V. 34 communication cannot be performed. That is,
As described above, the private branch exchanges 52A and 52B determine whether the communication is a telephone or facsimile communication based on the presence or absence of a CED signal indicating that the communication is facsimile communication. When no compression is performed and no CED signal is detected, band compression is performed on the assumption that the signal is an audio signal.

However, V.I. In the facsimile apparatus having the communication function of V.34, as shown in FIG. 8
Since a response is made with the ANSam signal in the procedure and the CED signal is not transmitted, for example, in the communication system shown in FIG. 3
If it has four communication functions, each of the private branch exchanges 52A and 52B on the calling side and the called side erroneously determines that it is a telephone, and performs band compression in spite of facsimile communication.
As a result, facsimile communication is disabled or the communication speed is reduced.

[0017]

According to a first aspect of the present invention, there is provided a data communication apparatus for transmitting and receiving a procedure signal by full-duplex communication. At the time of full duplex communication. It is characterized in that it has an identification signal sending means for sending an identification signal that allows the private branch exchange to recognize that the communication is a facsimile communication before starting the eight procedures.

According to this, at the time of outgoing call, V.P. Before starting the eight procedures, an identification signal indicating that the communication is a facsimile communication is transmitted from the identification signal transmitting means. Therefore, even if the data communication device on the called side is V. No. 34 is a device having a communication function and does not transmit a CED signal.
Even if the private branch exchange responds with the ANSam signal of the heavy communication, the private branch exchange recognizes that the communication is the facsimile communication by this identification signal transmitted from the data communication device of the present invention on the calling side, and performs the band compression. Not performed. As a result, communication becomes impossible or the communication speed becomes slow. 34 communication can be performed without any problem. According to a second aspect of the present invention, there is provided a data communication apparatus for transmitting and receiving a procedure signal by full-duplex communication. It is characterized in that it has an identification signal sending means for sending an identification signal that allows the private branch exchange to recognize that the communication is a facsimile communication before starting the eight procedures.

According to this, when an incoming call is received, V.P. Before starting the eight procedures, an identification signal indicating that the communication is a facsimile communication is transmitted from the identification signal transmitting means. Therefore, the private branch exchange recognizes that the communication is facsimile communication based on the identification signal transmitted from the data communication device of the present invention on the called side, and does not perform band compression.

As a result, communication becomes impossible or the communication speed becomes slow. 34 communication can be performed without any problem. According to a third aspect of the present invention, in the data communication apparatus according to the first or second aspect, the identification signal transmission switching means for switching whether or not the identification signal is transmitted by the identification signal transmission means is provided. The identification signal sending means sends the identification signal when the identification signal sending switching means is switched to the identification signal sending side.

The identification signal may always be transmitted at the time of facsimile communication irrespective of whether the signal is transmitted via the private branch exchange or not. In such a case, the identification signal is output even when it is not necessary, so that the time wasted. V. is required to shorten the communication time. 34 would be contrary to the purpose of the communication. Therefore, it is desirable to output the identification signal only at the time of facsimile communication via the private branch exchange, and it is desirable to have a configuration capable of designating whether or not to transmit the identification signal.

On the other hand, the data communication device may be installed so as to always transmit data via the private branch exchange, and the user must specify that an identification signal is transmitted every time a facsimile transmission is performed. , Get bothersome.

According to the above arrangement, there is provided identification signal transmission switching means for switching the presence or absence of the identification signal transmission. When the identification signal transmission switching means is switched to the identification signal transmission side, Since the identification signal is transmitted, the user can operate the identification signal transmission switching means to designate the presence / absence of the identification signal transmission. This eliminates the need to specify whether or not to transmit the identification signal each time facsimile transmission is performed, and operability is improved.

According to a fourth aspect of the present invention, there is provided a data communication apparatus according to the first or second aspect, wherein destination information such as a destination facsimile number input from an input means is stored. Storage means for storing information as to whether or not communication by the facsimile number is via the private branch exchange together with the destination facsimile number, and the identification signal transmitting means is based on the destination information stored in the storage means. It is characterized in that it is determined whether or not facsimile communication is performed via a private branch exchange, and if it is determined that facsimile communication is performed via a private branch exchange, an identification signal is transmitted.

Recently, a data communication device having a plurality of lines is also used. In such a data communication device,
As in the configuration of claim 3, the identification signal transmission switching means cannot collectively specify whether or not to transmit the identification signal,
It is necessary for the user to specify one by one for each facsimile transmission.

On the other hand, according to the above-described configuration, the user uses the input means such as a touch panel or the like to store the destination facsimile number and information on whether the communication by the facsimile number is communication via the private branch exchange. By registering in the means, the identification signal transmitting means determines whether or not the communication is facsimile communication via the private branch exchange based on the information stored in the storage means, and the facsimile communication is performed via the private branch exchange. Only in this case, an identification signal is transmitted.

Therefore, even if the user does not specify whether or not to transmit the identification signal each time facsimile transmission is performed, the identification signal is automatically transmitted only when necessary, thereby improving operability.

According to a fifth aspect of the present invention, in the data communication apparatus according to the first, second, third or fourth aspect, the identification signal is a CED signal.

Conventionally, when a private branch exchange detects a CED signal, it determines that the communication is a facsimile communication. Therefore, an identification signal that allows the private branch exchange to recognize the CED signal as the facsimile communication of the present invention. As compared with the case where another signal is used as the identification signal, the data communication device of the present invention can be applied and the effect can be obtained without changing the configuration and setting of the private branch exchange at all.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described below with reference to FIGS.

In the present embodiment, a digital multifunction peripheral in which a printer function and a facsimile function are added to a copying machine main body is exemplified as a data communication device. FIG.
1 shows a configuration of the digital multi-function peripheral of the present embodiment.

As shown in FIG. 1, the digital multifunction peripheral is
Reading unit 11, recording unit 12, reading / recording control unit 3, operation panel 10, panel control unit 2, main control unit 1, control memory 4, registration data memory 5, image information memory 6, encoding / decoding control unit 7, an NCU 8, and a modem 9.

The reading section 11 reads a document image, and the recording section 12 records image data as an image on a sheet or the like. The reading / recording control unit 3 controls the reading unit 11 and the recording unit 12 in accordance with an instruction from the main control unit 1. In the copy mode, the reading unit 11 causes the reading unit 11 to read an image of a document, and reads the read image. Recording unit 12
To record. In the printer mode, the recording unit 12 records image data transmitted from a personal computer (not shown) or the like. On the other hand, in the facsimile mode, at the time of facsimile transmission, the reading section 11 reads a transmission original, and sends the read image data to the encoding / decoding control section 7. At the time of facsimile reception, the received image data is received from the encoding / decoding control unit 7 and recorded by the recording unit 12.

Although not particularly shown, the operation panel 10 has a touch panel section together with a group of keys such as numeric keys, and serves as an input section used by a user to input a facsimile number of a destination and various information. It has a function as a display unit for performing a predetermined display to the user together with the function.

The panel control unit 2 controls the operation panel 10, detects a key input by an operator, and transmits the key input to the main control unit 1. In addition, based on the display information from the main control unit 1, it is displayed on the display unit of the operation panel 10.

The image information memory 6 stores facsimile transmission data and facsimile reception data read by the reading unit 11 in accordance with an instruction from the main control unit 1. Encoding / decoding control unit 7 during facsimile transmission
Stores the facsimile transmission data encoded in.
Further, at the time of facsimile reception, the stored facsimile reception data is transmitted to the encoding / decoding control unit 7.
Further, the image information memory 6 stores data from the modem 9 and transfers data to the modem 9 in accordance with an instruction from the main control unit 1.

The control memory 4 is a memory temporarily used by the main control unit 1 when controlling peripheral circuits such as the modem 9 and the NCU 8. Registration data memory 5 (storage means)
Is a memory that stores various types of registration information such as a destination facsimile number, volume, and dial signal type input by the user using the operation panel 10. Then, in the registration data memory 5, information indicating whether or not communication with the destination is through a private branch exchange is registered together with the destination facsimile number.

The encoding / decoding control unit 7 includes the main control unit 1
In accordance with the instruction from, the encoding and decoding of the image data necessary for the facsimile communication is performed. In the facsimile transmission, the read transmission data is encoded, and in the facsimile reception, the reception data is decoded.

The modem 9 performs transmission / detection of a DTMF signal, transmission of a signal used in facsimile communication, signal reception processing, and the like in accordance with an instruction from the main control unit 1. The modem 9 is used for modulating and demodulating a procedural signal. As V. Recommendation of V series 8, V.I. 21, V.I. 34, for modulation and demodulation of image signals. 27ter, V.I. 29, V.I. 1
7, V.I. It has 34 functions. The modem 9 and the main control unit 1 constitute an identification signal transmitting means according to the present invention. In accordance with an instruction from the main control unit 1, in the case of facsimile communication via a private branch exchange, And when a call is received, Before starting the procedure 8, an identification signal, here a CED signal, which allows the private branch exchange to recognize the facsimile communication, is transmitted.

An NCU (network control unit) 8 connects to a terminal of the line in order to use the telephone network for data communication and the like.
It controls connection of the telephone exchange network and switches to a data communication path. The main control unit 1 controls by transmitting a control signal to each block described above, and is a control center of the digital multi-function peripheral. Then, as described above, the main control unit 1 outputs a control signal to the modem 9 so as to output a control signal when calling and receiving a call. Before entering 8 steps C
An ED signal is transmitted. Further, here, when the user inputs a facsimile transmission destination using the operation panel 10, the main control unit 1 registers the registration data memory 5.
It is determined whether or not communication to the other party is via a private branch exchange based on the registration information in the above.

In the case of the present digital multifunction peripheral, the above-described image information memory 6, encoding / decoding control unit 7, NCU 8,
The modem 9 is unitized, and the number of lines can be increased by adding the unit as an option.

FIG. 2 shows a telephone including the digital MFP.
1 shows a facsimile communication system. Originally, the communication system is composed of a number of business establishments, but here, for convenience, it is assumed that business establishments A and B are configured.

A large number of facsimile machines (F
AX) 21A ... and telephone (TEL) 20A ... and a number of facsimile machines 21B ...
B ... are the private branch exchanges 22A and 22B of each business office.
These private branch exchanges 22A and 22B are connected via a dedicated line and also connected to a public network exchange 24 via a public line.

The digital multifunction peripheral 100 is provided with a new line 2 as an option, and is connected to the public network exchange 24 via a public line and also to the private branch exchange 22A.

Next, an example of a communication sequence in facsimile communication between offices in the communication system will be described with reference to FIGS.

FIGS. 3 (a) and 3 (b) show a case where the digital multifunction peripheral 100 of the business office A transfers the facsimile apparatus 21B of the business office B.
FIG. 3A shows an example of a communication sequence when facsimile transmission is performed via each of the private branch exchanges 22A and 22B at each office. FIG. 3
4 (b), the facsimile apparatus 21 of the B office has the V.4 communication function (ANSam signal is present). No. 34 No communication function (No ANSam signal).

As shown in FIGS. 9A and 9B, in the digital multifunction peripheral 100 on the calling side, each private branch exchange 22A.
Since the communication is via 22B, a CED signal is transmitted as an initial procedure when a call is originated. Based on this CED signal, each of the private branch exchanges 22A and 22B at each business office determines that the communication is facsimile communication and does not perform band compression.

Here, the facsimile machine 21B of the B-office, which is the called side, receives the V.21. If the device has a communication function, as shown in FIG. 8
Enter the procedure and change the ANSam signal (2100Hz to 15Hz
Is transmitted.

Upon receiving the ANSam signal, the digital multifunction peripheral 100 on the calling side receives the V.A.M. 8 procedure, and then 34 procedure and V.34. 34
The image signal is transmitted based on.

That is, in the case of full-duplex communication, the digital multifunction peripheral 100 receives the ANSam signal from the called side, and A CM signal is transmitted by 8-modulation, and the CM signal notifies the called side of a transmission mode that can be used in transmitting the image signal. When the called party receives the CM signal,
The transmission of the ANSam signal is stopped. JM by 8 modulation
Send a signal. The called party can use this JM signal to
Among the executable transmission modes notified by the M signal, the transmission side that the called side can execute is notified to the calling side.

The digital multifunction peripheral 100 on the calling side uses JM
When the signal is received, the transmission of the CM signal is stopped, and An 8-modulation CJ signal is transmitted. Digital multifunction peripheral 10 on the calling side
0 notifies the called side of the transmission mode determined based on the JM signal by the CJ signal. Upon receiving the CJ signal, the called side stops sending the JM signal and proceeds to the process of receiving a line probing signal from the calling side.

The digital multifunction peripheral 100 on the calling side has a CJ
After a lapse of a predetermined time from the stop of the signal transmission, a line probing signal (a signal modulated by V.34) for checking the status of the line 2 is transmitted. The called party
When a line probing signal is received, a response signal to the line probing signal (V.34 modulated signal)
Is transmitted, the transmission level of the subsequent signal, the correction of the amplitude level, and the transmission baud rate are notified to the calling side by the response signal, and the process proceeds to the reception processing of the long training signal from the calling side.

Upon receiving the response signal, the digital multifunction peripheral 100 on the calling side stops transmitting the line probing signal, and after a predetermined time has elapsed since the transmission was stopped, the digital multifunction peripheral 100 transmits the signal. A long training signal of 34 modulation is transmitted. The callee uses this long training signal to adjust the equalizer of the modem,
Execute processing such as timing detection.

After transmitting the long training signal, the digital multifunction peripheral 100 on the calling side transmits the V.V. 3
A four-modulation parameter exchange signal is transmitted. When the called party receives the parameter conversion signal, it receives the V.264. A 34-parameter conversion response signal is sent out, and the subsequent link correction and bit rate are notified to the calling side by this response signal. Then, the called side follows the parameter exchange response signal and sets T. 3
0 of the recommended CSI and DIS signals. 34, and is transmitted by the calling party. TS1, DC of 30 Recommendations
The flag is transmitted until the S signal is received.

The digital multifunction peripheral 100 on the calling side has a CS
When the I. DIS signal is received, the transmission of the parameter exchange signal is stopped. After transmitting the TSI and DCS signals by 34 modulation, a flag is transmitted until a CFR signal is received from the called side. Upon receiving the TSI and DCS signals from the calling side, the called side stops sending the flag and A CFR signal is transmitted by 34 modulation.

The digital MFP 100 on the calling side has a CFR
When the signal is received, the flag transmission is stopped, and after a predetermined time elapses, the image signal is transmitted in the transmission mode set in the previous procedure, and the called side receives the image signal in the set transmission mode.

After transmitting the image signal of one page, the digital multifunction peripheral 100 on the calling side transmits the image signal of the next page in the transmission mode as it is, after a lapse of a predetermined time from the end of the transmission of the image signal. After transmitting the PPS-MPS signal, the flag is transmitted until the MCF signal is received from the called side. When the transmission of the next page is performed by changing the transmission mode, the PPS-EOM is used instead of the PPS-MPS signal.
Send a signal. Upon receiving the PPS-MPS signal, the called side transmits an MCF signal, and then proceeds to the image signal receiving process for the next page.

The digital multifunction peripheral 100 on the calling side has an MC
When the F signal is received, the flag transmission is stopped, and after a predetermined time has elapsed, the image signal of the next page is transmitted. If the page is the last page, after the transmission of the image signal of the page is completed, a PPS-EOP signal is transmitted after a lapse of a predetermined time, and a flag is transmitted until an MCF signal is received from the called side. Then, the called side receives the PPS-EOP signal and sends out the MCF signal. When the digital MFP 100 on the calling side receives this MCF signal, it stops sending the flag and sends out the DCN signal.

On the other hand, if the facsimile apparatus 21B on the called side receives the 34 (b) if the device does not have a communication function.
As shown in FIG.
The NSF signal, the CSI signal, and the DIS signal according to the 21 procedures are sequentially transmitted. Here, since the digital multifunction peripheral that is the calling side does not receive the ANSam signal, the other party's facsimile apparatus receives the ANSam signal. 34 Judgment that there is no communication function,
V. After a predetermined time has elapsed after receiving the NSF, CSI, and DIS signals of the V.21 procedure, NSS by 21 procedures,
The TSI and DCS signals are sequentially transmitted. In addition, V. Since the description of the communication sequence of the device having no communication function is widely known, it is omitted here for convenience of description.

FIGS. 4A and 4B show facsimile transmissions from the facsimile machine 21B at the B office to the digital multifunction peripheral 100 at the A office via the private branch exchanges 22B and 22A at each office. FIG. 3A shows an example of a communication sequence in the case where the facsimile apparatus 21B at the office B has a V.21. FIG. 4B shows a case where the facsimile apparatus 21 of the office B has the V.34 communication function. No. 34 does not have a communication function.

In the digital multifunction peripheral 100, FIG.
As shown in (b), when an incoming call is received, the first procedure is CE
D signal and then V.D. Responds with an ANSam signal of 8 procedures. At this time, the private branch exchanges 22A and 22B at the respective offices determine that the communication is facsimile communication and do not perform band compression based on the CED signal output at this time.

Here, the facsimile machine 21B of the office B, which is the calling side, sends the V.F. If the device has a communication function (with CM), as shown in FIG.
In response to the signal, the other party, that is, the digital MFP 10
0 is V. V.34 communication function, and A CM signal is transmitted by eight procedures. The following description is based on FIG.
Since it is the same as (a), the description is omitted for convenience.

On the other hand, the facsimile apparatus 21B of the office B, which is the calling side, sends the V.F. If the device does not have a communication function (without CM), without transmitting a CM signal as shown in FIG. NSF signal by 21 procedures, CS
The I signal and the DIS signal are sequentially transmitted. Also here,
The following description is omitted for convenience.

Next, the digital MFP 10 belonging to the communication system of FIG. 2 will be described with reference to the flowcharts of FIGS.
Control of the calling side and control of the called side at 0 will be described.

In FIG. 5, at S1, first, initialization processing of various circuits such as the NCU 8 and the modem 9 shown in FIG. 1 is performed.

Next, in S2 and S3, it is determined whether the outgoing call or the incoming call is selected. If the outgoing call is selected, the process proceeds to S4, and if the incoming call is selected, the process proceeds to S41 in FIG. move on.

At S4, a line connection is made. That is, CM
L is turned on, and the facsimile number of the other party is set to D in the modem 9 in response to a key input from the operation panel 10 shown in FIG.
A TMF signal generator or a dialer in the NCU 8 is used to transmit a dial signal to a specified line.

In S5, a predetermined time is set in the timer T1, and the flow advances to S6. At S6, each private branch exchange 22A.2
It is determined whether or not the communication is via at least one of 2B. The determination as to whether or not to pass through at least one of the private branch exchanges 22A and 22B is made based on the registration information in the registration data memory 5.

If the communication does not pass through any of the private branch exchanges 22A and 22B, the process skips S7 and proceeds to S8. On the other hand, if it is determined that the communication is performed via at least one of the private branch exchanges 22A and 22B, S7
The CED signal for recognizing that the communication is the facsimile communication through the processing of the modem 9 shown in FIG.
Then, the process proceeds to S8.

At S8, a signal is received from the other party (called side), and the presence or absence of reception is determined at S9, S10, and S11. At S9, the NSF, CSI, and DIS signals (according to the V.21 procedure) Signal), S2 in FIG.
If the ANSam signal is received in S10, the process proceeds to S23 in FIG. 6. If the timer T1 has not timed out in S11, the process returns to S8. If the timer T1 has timed out, an error is determined. Then, the process enters a predetermined error process of S12.

In step S21 shown in FIG. 8 functions (V.8 procedure possible) are determined, and If it has eight functions, it proceeds to S22. On the other hand, V. If it does not have 8 functions, proceed to S30,
V. 21 procedure and half duplex communication, that is, V.21. 27ter, V.I. 29, V.I. 17 are transmitted.

On the other hand, in S22, V. An CI signal, which is a signal of the eight procedures, is transmitted to the called side to notify the called party that the V.8 procedure is possible. In step S23, the ANSam signal is received. When the ANSam signal is received, the process proceeds to step S24 and the V.Sam signal is received. An eight-step CM signal is transmitted. At the same time, The JM signal of the eight procedures is received (S25),
If a JM signal is received, the process proceeds to S29, while if a JM signal is not received, the process proceeds to S26.

At S26, it is determined whether or not the transmission of the CM signal has been completed.
If no JM signal is received at 25, it is determined that full-duplex communication is not possible, and the process proceeds to S27.

At S27 and S28, it is determined whether or not the NSF, CSI, and DIS signals are received before the timer T1 times out. If the NSF, CSI, and DIS signals are received, the process proceeds from S27 to S30, and V. 2
One procedure is performed, and a procedure signal is transmitted and received by half-duplex communication. When the timer T1 times out, S1
The error processing of step 2 is started.

On the other hand, when the JM signal is received in S25, S
Go to V.29. After transmitting the CJ signal of eight procedures,
31 and enter full duplex communication. 34 procedures;
The image transmission of the 34 communication is executed.

On the other hand, if it is determined in S3 of FIG. 5 that there is an incoming call and the process proceeds to S41 in FIG. 7, the line is connected, the CML is turned on in S41, and the process proceeds to S42. In S42, it is determined whether or not the communication is via at least one of the private branch exchanges 22A and 22B. The determination in this case is also made based on the information registered in the registration data memory 5. If the communication does not go through any of the private branch exchanges 22A and 22B, the process proceeds to S44. On the other hand, when it is determined that the communication is performed via at least one of the private branch exchanges 22A and 22B, a CED signal for recognizing the facsimile communication is transmitted through the process of S43.
After transmission from the modem 9 shown in FIG. 1, the process proceeds to S44.

At S44, transmission of the ANSam signal is started. In S45, V.V. If the CM signal is received before the ANSam signal transmission end is confirmed in S50, the process proceeds to S46 and proceeds to S46. The CM signal of 8 procedures is transmitted, and the CM signal cannot be received.
When the reception of the m signal ends, the process proceeds to S51.

The case of proceeding to S46 is a case where the CM signal can be received during the transmission of the ANSam signal and full duplex communication is possible. After transmitting the JM signal of the eight procedures and further receiving the CJ signal in S47 before confirming the end of the transmission of the JM signal in S49, since full-duplex communication is possible here, the process proceeds to S55. .
34 procedures; The image reception of 34 continues.

On the other hand, when the transmission of the JM signal is completed without receiving the CJ signal in S48 and S49, it is determined that full-duplex communication is not possible, and the process proceeds to S49, where the VSF is added to the NSF, CSI, and DIS signals. 8 Information without function is set, and its NSF,
After transmitting the CSI and DIS signals, the process proceeds to S56, and the above-mentioned V.V. 21 procedure, and 27ter, V.I. 29, V.I. 1
7 is received.

At S51, V.V. NSF by 21 procedures,
The CSI and DIS signals are transmitted. Here, V.V. 8. Notify the transmitter that there is a function. And S5
In step S2, it is checked whether or not a CI signal (a signal in the V.8 procedure) has been received. If the CI signal has not been received, the process proceeds to step S56. 21 procedure, and 27te
r, V.R. 29, V.I. 17 is received.

As described above, in the digital multifunction peripheral 100, when calling, the V.D. Before starting the eight procedures, an identification signal capable of recognizing that the communication is a facsimile communication is transmitted to each of the private branch exchanges 22A and 22B.

As a result, even if the called facsimile apparatus has the V. 34. An apparatus having a communication function, comprising:
If the private branch exchanges 22A and 22A used for the communication do not transmit the D signal and respond with the ANSam signal of the full duplex communication.
22B uses the identification signal to recognize that the communication is a facsimile communication, and does not perform band compression. Therefore, a private branch exchange that could not be performed because communication was impossible or communication speed was reduced in the past. V. through 34 communication becomes possible. Also, in the digital multifunction peripheral 100, at the time of an incoming call, the V.D. Before starting the eight procedures, an identification signal capable of recognizing that the communication is a facsimile communication is transmitted to each of the private branch exchanges 22A and 22B.

As a result, each of the private branch exchanges 22A and 22B used for the communication recognizes that the communication is a facsimile communication based on the identification signal transmitted from the called side and does not perform band compression. Conventionally, V.V. via a private branch exchange, which could not be performed because communication became impossible or communication speed became slow, was not possible. 34 communication becomes possible. Further, in the digital multifunction peripheral 100, conventionally, each of the private branch exchanges 22A and 22B uses a CED signal that determines that the communication is facsimile communication as an identification signal. In comparison, the data communication device of the present invention can be applied and the effect can be obtained without changing the configuration and setting of each of the private branch exchanges 22A and 22B.

Further, in the digital multi-function peripheral 100, information as to whether or not communication using the facsimile number is to be performed via each of the private branch exchanges 22A and 22B is stored in the registration data memory 5 together with the destination facsimile number. The main control unit 1 determines whether or not facsimile communication is performed via at least one of the private branch exchanges 22A and 22B based on the stored destination information, and at least one of the private branch exchanges is determined. 22A ・ 22
When it is determined that the communication is facsimile communication via B, an identification signal is transmitted.

As a result, as in the digital multifunction peripheral 100, there are a plurality of lines, and a single device performs facsimile communication via the private branch exchanges 22A and 22B, or directly through a public line. When facsimile communication to be performed is also possible, the identification signal is automatically transmitted only when necessary without specifying the user each time facsimile transmission, so that operability is good.

The identification signal may be always transmitted at the time of facsimile communication regardless of whether the signal is transmitted via the private branch exchanges 22A and 22B. In this case, the identification signal is output even when the identification signal is unnecessary. In order to reduce the communication time, V.V. 3
(4) Partly defeats the purpose of communication.

In the digital multifunction peripheral 100, the main control unit 1 determines whether or not communication is to be performed via one of the private branch exchanges 22A and 22B based on the information in the registration data memory 5. For example, if the apparatus has one line and is installed so that facsimile communication is always performed via a private branch exchange, the apparatus main body is provided with a changeover switch (identification signal transmission switching means) for switching whether or not to transmit an identification signal. A configuration may be provided in which the identification signal is transmitted at the time of outgoing or incoming calls only when the changeover switch is switched to the side with identification signal transmission.

Although the present invention has been described with reference to an example in which the present invention is mounted on a digital multi-function peripheral, the present invention provides a data communication system capable of performing full-duplex communication for performing procedure signal communication and data communication. All can be applied to the device.

[0089]

As described above, the data communication apparatus according to the first aspect of the present invention is a data communication apparatus that transmits and receives a procedure signal by full-duplex communication. . Before starting the eight procedures, the private branch exchange has an identification signal transmitting means for transmitting an identification signal capable of recognizing that the communication is facsimile communication.

Thus, the private branch exchange can transmit / receive the procedure signal by V.2. Even if there is no response from the called side with a CED signal, the identification signal transmitted from the calling side recognizes that the communication is facsimile communication and does not perform band compression. as a result,
Since the communication becomes impossible or the communication speed becomes slow, V.V. 34 can be implemented without any problem.

As described above, the data communication apparatus according to the second aspect of the present invention is a data communication apparatus which transmits and receives a procedure signal by full-duplex communication. Before starting the eight procedures, the private branch exchange has an identification signal transmitting means for transmitting an identification signal capable of recognizing that the communication is facsimile communication.

Thus, the private branch exchange can transmit / receive the communication procedure signal by full duplex communication. Even if the communication is a 34-communication and has a configuration that responds with an ANSam signal, the identification signal transmitted first recognizes that the communication is a facsimile communication and does not perform band compression.

As a result, communication becomes impossible or the communication speed becomes slow. 34 can be implemented without any problem.

According to a third aspect of the present invention, there is provided a data communication apparatus according to the first or second aspect, wherein the identification signal transmitting means is capable of switching whether or not the identification signal is transmitted by the identification signal transmitting means. Switching means, wherein the identification signal sending means, the identification signal sending switching means,
The configuration is such that the identification signal is transmitted when the mode is switched to the identification signal transmission side.

[0095] This enables the user to specify the presence / absence of the identification signal by the identification signal transmission switching means at a time, so that the data communication apparatus is always installed so as to transmit via the private branch exchange. For example, it is not necessary to specify whether or not to transmit the identification signal each time facsimile transmission is performed. As a result, V.V. In addition, the operability can be improved without violating the purpose of the communication.

According to a fourth aspect of the present invention, there is provided a data communication apparatus according to the first or second aspect, wherein destination information such as a destination facsimile number input from an input means is stored. Storage means for storing information as to whether or not communication by the facsimile number is via the private branch exchange together with the destination facsimile number, and the identification signal transmitting means is based on the destination information stored in the storage means. First, it is determined whether or not facsimile communication is performed via a private branch exchange, and if it is determined that facsimile communication is performed via a private branch exchange, an identification signal is transmitted.

Thus, the user automatically registers the identification signal by registering the information on whether or not the communication by the facsimile number is the communication via the private branch exchange together with the destination facsimile number in the storage means. The data communication device has a plurality of lines because it is determined and transmitted as unnecessary, and the identification signal transmission switching means designates the presence or absence of transmission of the identification signal collectively by the identification signal transmission switching means. Even if it is not possible, it is not necessary to specify whether or not to transmit an identification signal each time facsimile transmission is performed.

As a result, it is possible to reduce the communication time. In addition, the operability can be improved without violating the purpose of the communication.

A data communication device according to a fifth aspect of the present invention is the data communication device according to the first, second, third or fourth aspect, wherein the identification signal is a CED signal.

As a result, the data communication apparatus of the present invention can be applied as it is without changing the configuration / setting of the private branch exchange in the related art as compared with the case where another signal different from the CED signal is used as the identification signal. The effect is also achieved.

[Brief description of the drawings]

FIG. 1 illustrates one embodiment of the present invention, and is a block diagram illustrating a configuration of a digital multifunction peripheral.

FIG. 2 is an explanatory diagram of a telephone / facsimile communication system to which the digital MFP belongs.

3 (a) and 3 (b) are explanatory diagrams showing a communication sequence of facsimile communication in which the digital MFP is used as a calling side in the telephone / facsimile communication system of FIG.

4 (a) and 4 (b) are explanatory diagrams showing a communication sequence of facsimile communication in which the digital multi-function peripheral is called in the telephone / facsimile communication system of FIG.

FIG. 5 is a flowchart illustrating a control procedure of facsimile communication in the digital multifunction peripheral.

FIG. 6 is a flowchart illustrating a control procedure of facsimile communication in the digital multifunction peripheral.

FIG. 7 is a flowchart illustrating a control procedure of facsimile communication in the digital multifunction peripheral.

FIG. 8 is an explanatory diagram of a telephone / facsimile communication system in a conventional example.

9A and 9B are explanatory diagrams showing a communication sequence of facsimile communication in the telephone / facsimile communication system of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main control part (identification signal transmission means) 5 Registration data memory (storage means) 9 Modem (identification signal transmission means) 10 Operation panel (input means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeki Nakahara 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Within Sharp Corporation (72) Inventor Tamotsu Shuto 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka (72) Inventor Katsumi Nagata 22-22 Nagaikecho, Abeno-ku, Osaka City, Osaka Sharp Corporation (72) Inventor Tsutomu 22-22-22 Nagaikecho, Abeno-ku, Osaka City, Osaka Sharp Corporation F Terms (reference) 5C075 AB02 CA01 CD21 CD25 5K101 KK01 MM02 MM04 MM05 NN22 NN25 QQ04 QQ07 RR22 RR27 TT02 UU17

Claims (5)

[Claims] 1. A data communication apparatus for transmitting and receiving a procedure signal by full-duplex communication, comprising: 8. A data communication apparatus comprising: identification signal sending means for sending an identification signal that allows a private branch exchange to recognize that the communication is a facsimile communication before starting the procedure. 2. A data communication apparatus for transmitting and receiving a procedure signal by full-duplex communication, comprising the steps of: 8. A data communication apparatus comprising: identification signal sending means for sending an identification signal that allows a private branch exchange to recognize that the communication is a facsimile communication before starting the procedure. 3. An identification signal transmission switching means for enabling switching of whether or not an identification signal is transmitted by the identification signal transmission means, wherein the identification signal transmission means is arranged such that the identification signal transmission switching means is on the identification signal transmission side. 3. The data communication device according to claim 1, wherein an identification signal is transmitted when the data communication is switched. 4. A storage device for storing destination information such as a destination facsimile number input from an input means, and for storing information on whether or not communication by the facsimile number is performed via a private branch exchange together with the destination facsimile number. Means, wherein the identification signal sending means determines whether or not the communication is facsimile communication via the private branch exchange based on the destination information stored in the storage means, and determines that the communication is facsimile communication via the private branch exchange. 3. The data communication device according to claim 1, wherein an identification signal is transmitted. 5. The data communication device according to claim 1, wherein the identification signal is a CED signal.