JP3611739B2 - Data communication device - Google Patents

Description

[0001]
BACKGROUND 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 that transmits and receives a procedure signal by full duplex communication.
[0002]
[Prior art]
Today, facsimile communication is widespread, and the amount of facsimile communication inside and outside the company is increasing in companies. For this reason, in addition to using the general public network directly, a private branch exchange is provided in the same manner as a telephone, and facsimile communication inside and outside the company is performed via the private branch exchange.
[0003]
FIG. 8 shows a telephone / facsimile communication system including such facsimile communication. Originally, the communication system is composed of a large number of business office groups, but here, for the sake of convenience, the configuration of business office A and business office B will be described.
[0004]
In the communication system, a large number of facsimile machines (FAX) 51A... And telephones (TEL) 50A in the A office are connected to a private branch exchange 52A in the A office, and a large number of facsimile apparatuses 51B in the B office and telephones. 50B... Are connected to a private branch exchange 52B of the B office. The private branch exchanges 52A and 52B of the A office and the B office are connected by a dedicated line, and are also connected to the public network switch 54 via a public line, and are connected to a public telephone network. The office A also includes a facsimile machine 51A that is directly connected to the public network switch 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 the A office to the B office.
[0006]
(1) A facsimile apparatus 51A that is not connected to the private branch exchange 52B at the A office transmits directly to the private branch exchange 52B at the B office via the public network exchange 54, and the facsimile apparatus 51B at the B office via the private branch exchange 52B. To send to.
[0007]
(2) The facsimile apparatus 51A connected to the private branch exchange 52A of the A office transmits the private branch exchange 52A via the private branch exchange 52A to the private branch exchange 52B of the B office, and passes through the private branch exchange 52B. And transmitting to the facsimile machine 51B of the B office.
[0008]
(3) From the facsimile apparatus 51A connected to the private branch exchange 52A of the A office, directly to the facsimile apparatus 51B of the B office connected to the private branch exchange 52B of the B office through the private branch exchange 52A via the private line. how to. This method does not go through a general public network.
[0009]
Recently, facsimile machines that can connect two lines have been used. In such a facsimile apparatus, one line can be connected to a public line, and the other line can be connected to a private line via a private branch exchange.
[0010]
By the way, in the above private branch exchanges 52A and 52B, in order to increase the number of communications by effectively utilizing the bandwidth of the lines (dedicated lines and public lines), it is determined whether the telephone or facsimile communication, and if it is determined to be a telephone, Band compression of audio signals is performed.
[0011]
Conventionally, in the private branch exchanges 52A and 52B, it is determined whether there is a telephone or facsimile communication based on the presence or absence of a CED signal sent as a response at the time of the incoming call from the facsimile machine on the incoming call side.
[0012]
FIG. 9A shows an example of a communication sequence in conventional facsimile communication that responds with a CED signal. Here, the procedure signal for setting the communication mode and the like is transmitted and received by half-duplex communication.
[0013]
As can be seen from the figure, the called facsimile apparatus first responds with a CED signal notifying that the communication is facsimile communication, and then V. 21 steps NSF signal, CSI signal, DIS signal are sent. 27ter, V. 29, V.R. 17 image transmissions are executed.
[0014]
On the other hand, in the ITU-T recommendation, in order to shorten the communication time, a procedure signal that has been transmitted / received by half duplex communication in the past is transmitted / received by full duplex communication. 34 communication is standardized.
[0015]
In FIG. 9B, a V.V. A communication sequence example of 34 communication is shown.
[0016]
V. 34 communication, V. It responds with an ANSam signal indicating that there are 8 procedures, and the calling party (the partner machine) 34 if the communication function is provided. 8 procedures are performed, and then V. 34 procedures and image transmission are executed.
[0017]
On the other hand, the calling party is V.D. When the communication function is not provided, no response is made to the ANSam signal, so that the callee side receives the V.30 of the half duplex communication shown in FIG. Shift to sending of DIS signal of 21 steps. 21 procedures; 27ter, V. 29, V.R. 17 image transmissions are executed.
[0018]
[Problems to be solved by the invention]
However, with the above-described conventional technology, facsimile communication becomes impossible or the communication speed becomes low, and V.V. 34 There is a problem that communication cannot be performed.
[0019]
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 the band compression is not performed and the CED signal is not detected, the band compression is performed as an audio signal.
[0020]
However, V.I. In the facsimile apparatus with the 34 communication function, as shown in FIG. Since the ANSam signal of 8 procedures is responded and the CED signal is not transmitted, for example, in the communication system shown in FIG. If the 34 communication function is provided, 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 becomes impossible and the communication speed becomes slow.
[0021]
[Means for Solving the Problems]
In order to solve the above problems, the data communication device according to the present invention describes:In facsimile communicationData communication device that transmits and receives procedure signals by full duplex communicationA data communication apparatus for performing communication via a private branch exchange that does not perform band compression in the case of facsimile communication while performing band compression of a voice signal when communication is a telephone.At the time of a callIn addition,V. of full duplex communication. Before entering 8 steps, let the private branch exchange recognize that the communication is a facsimile communication.ForAn identification signal sending means for sending an identification signal;Storing destination information such as a destination facsimile number input from the input means, and storing means for storing information on whether communication by the facsimile number is via a private branch exchange together with the destination facsimile number; The identification signal sending means judges whether or not the facsimile communication is via a private branch exchange based on the destination information stored in the storage means, and if the facsimile signal is via the private branch exchange, the identification signal sending means Send a signalIt is characterized by that.
[0022]
According to this, V. Before entering 8 procedures, an identification signal indicating that the communication is facsimile communication is sent from the identification signal sending means. Therefore, even if the data communication device on the called side is V.D. 34 Even if a device having a communication function does not send out a CED signal and responds with an ANSam signal of full duplex communication, the private branch exchange is transmitted from the data communication device of the present invention on the calling side. The identification signal recognizes that the communication is facsimile communication and does not perform band compression.
[0023]
As a result, communication becomes impossible and communication speed becomes slow, so that V.V. 34 communication can be performed without problems.
[0024]
In addition, data communication apparatuses having a plurality of lines are also used. However, in such data communication apparatuses, identification signal transmission switching means cannot collectively specify whether or not to transmit identification signals, and facsimile transmission is possible. It is necessary for the user to specify each time.
[0025]
On the other hand, according to the above configuration, for example, the input means such as a touch panel is used by the user to register information on whether or not communication by the facsimile number is communication via the private branch exchange together with the destination facsimile number. By determining whether the identification signal sending means is a facsimile communication via the private branch exchange based on the information stored in the storage means, only when the facsimile communication is via the private branch exchange, An identification signal is transmitted.
[0026]
Therefore, even if the user does not specify whether or not to transmit the identification signal every time the facsimile transmission is performed, the identification signal is automatically transmitted only when necessary, so that the operability is improved.
[0027]
In order to solve the above problems, the data communication device of the present invention providesIn facsimile communicationData communication device that transmits and receives procedure signals by full duplex communicationWhen the communication is a telephone, the audio signal is band-compressed, whereas when the communication is a facsimile communication, the band-compression is performed. Data communication device that communicates via private branch exchangeAt the time of an incoming callIn addition,V. of full duplex communication. Before entering 8 steps, let the private branch exchange recognize that the communication is facsimile communicationforIdentification signal sending means for sending identification signalStorage means for storing destination information such as a destination facsimile number input from the input means, and storing information on whether or not communication by the facsimile number passes through the private branch exchange together with the destination facsimile number. The identification signal sending means determines whether or not the facsimile communication is via a private branch exchange based on the destination information stored in the storage means, and if it is determined that the facsimile communication is via a private branch exchange, Send the identification signalIt is characterized by doing.
[0028]
According to this, V. Before entering 8 procedures, an identification signal indicating that the communication is facsimile communication is sent from the identification signal sending means. Therefore, the private branch exchange recognizes that the communication is facsimile communication from the identification signal transmitted from the data communication device of the present invention on the called side, and does not perform band compression.
[0029]
As a result, communication becomes impossible and the communication speed becomes slow, so that the V.V. 34 communication can be performed without any problem.
[0030]
In addition, data communication apparatuses having a plurality of lines are also used. However, in such data communication apparatuses, identification signal transmission switching means cannot collectively specify whether or not to transmit identification signals, and facsimile transmission is possible. It is necessary for the user to specify each time.
[0031]
On the other hand, according to the above configuration, for example, the input means such as a touch panel is used by the user to register information on whether or not communication by the facsimile number is communication via the private branch exchange together with the destination facsimile number. By determining whether the identification signal sending means is a facsimile communication via the private branch exchange based on the information stored in the storage means, only when the facsimile communication is via the private branch exchange, An identification signal is transmitted.
[0032]
Therefore, even if the user does not specify whether or not to transmit the identification signal every time the facsimile transmission is performed, the identification signal is automatically transmitted only when necessary, so that the operability is improved.
[0033]
In order to solve the above-described problems, the data communication apparatus of the present invention is a data communication apparatus that transmits and receives a procedure signal by full duplex communication in facsimile communication. On the other hand, in the case of facsimile communication, in a data communication apparatus that communicates via a private branch exchange that does not perform band compression, full-duplex V.V. Before entering 8 procedures, a signal used for recognizing that the communication is facsimile communication in the communication in which the private branch exchange transmits a procedure signal by half duplex communication to the private branch exchange is sent as an identification signal. It is characterized by having an identification signal transmitting means.
[0034]
In order to solve the above-described problem, the data communication apparatus of the present invention is a data communication apparatus that transmits and receives a procedure signal by full-duplex communication in facsimile communication. On the other hand, in the case of facsimile communication, in a data communication apparatus that communicates via a private branch exchange that does not perform band compression, V. Before entering 8 procedures, a signal used for recognizing that the communication is facsimile communication in the communication in which the private branch exchange transmits a procedure signal by half duplex communication to the private branch exchange is sent as an identification signal. It is characterized by having an identification signal transmitting means.
[0035]
In order to solve the above-described problems, the data communication apparatus of the present invention is a data communication apparatus that transmits and receives a procedure signal by full duplex communication in facsimile communication. On the other hand, in the case of facsimile communication, the band compression is not performed. In a data communication apparatus that communicates via a private branch exchange, V. of full duplex communication is performed at the time of outgoing and incoming calls. Before entering 8 procedures, a signal used for recognizing that the communication is facsimile communication in the communication in which the private branch exchange transmits a procedure signal by half duplex communication to the private branch exchange is sent as an identification signal. It is characterized by having an identification signal transmitting means.
[0036]
Also in these cases, the destination information such as the destination facsimile number input from the input means is stored, and information on whether or not communication by the facsimile number goes through the private branch exchange together with the destination facsimile number. Storing means for storing, wherein the identification signal sending means judges whether or not the facsimile communication is via the private branch exchange based on the destination information stored in the storage means, and the facsimile communication via the private branch exchange is used. If it is determined that there is, the identification signal may be transmitted.
[0037]
Each of the data communication devices of the present invention described above includes an identification signal transmission switching unit that can switch whether or not the identification signal is transmitted by the identification signal transmission unit, and the identification signal transmission unit includes the identification signal transmission switching unit. The identification signal is sent out when switched to the side with the identification signal transmission.It can also be.
[0038]
Regardless of whether a private branch exchange is used or not, a configuration in which an identification signal is always transmitted at the time of facsimile communication may be used. However, in this case, since the identification signal is output even when it is not required, a correspondingly wasteful time is required. V. such as shortening the communication time. This is contrary to the purpose of the 34 communication. Therefore, it is desirable to output the identification signal only during facsimile communication via the private branch exchange, and it is desirable to be able to designate whether or not to send the identification signal.
[0039]
On the other hand, there is a case where the data communication apparatus is always installed so as to transmit via the private branch exchange, and in this case, the user must designate that the identification signal is transmitted every time the facsimile transmission is performed, which is bothersome. .
[0040]
According to the above configuration, the identification signal transmission switching means that enables switching whether or not the identification signal is transmitted is provided, and when the identification signal transmission switching means is switched to the identification signal transmission side, the identification signal is transmitted. Since the information is transmitted, the user can specify the presence / absence of transmitting the identification signal by operating the identification signal transmission switching means.
[0041]
As a result, it is not necessary to designate whether or not the identification signal is transmitted every time facsimile transmission is performed, and the operability is improved.
[0042]
Further, in each of the data communication devices of the present invention, the CED signal is used as the identification signal for a private branch exchange that recognizes that the communication is facsimile communication by a CED signal. You can also.
[0043]
Conventionally, when a private branch exchange detects a CED signal, the private branch exchange determines that the communication is facsimile communication. Therefore, the private branch exchange uses the CED signal as an identification signal that allows the private branch exchange to recognize that the communication is the facsimile communication of the present invention. Thus, the data communication apparatus of the present invention can be applied and an effect can be obtained without changing the configuration / setting on the private branch exchange side as compared with the case where other signals are used as identification signals.
[0044]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment according to the present invention will be described below with reference to FIGS.
[0045]
In the present embodiment, as a data communication apparatus, a digital multi-functional peripheral in which a printer function and a facsimile function are added to a copier main body is illustrated.
[0046]
FIG. 1 shows a configuration of a digital multifunction peripheral according to this embodiment.
[0047]
As shown in FIG. 1, the digital multi-function peripheral includes a reading unit 11, a recording unit 12, a reading / recording control unit 3, an operation panel 10, a panel control unit 2, a main control unit 1, a control memory 4, and a registration data memory. 5, an image information memory 6, an encoding / decoding control unit 7, an NCU 8, and a modem 9.
[0048]
The reading unit 11 reads a document image, and the recording unit 12 records image data as an image on a sheet or the like.
[0049]
The reading / recording control unit 3 controls the reading unit 11 and the recording unit 12 in accordance with instructions from the main control unit 1. In the copy mode, the reading unit 11 reads an image of a document and reads the read image. Recording is performed by the recording unit 12. In the printer mode, image data transmitted from a personal computer (not shown) is recorded by the recording unit 12. On the other hand, in the facsimile mode, at the time of facsimile transmission, the reading document is read by the reading unit 11 and the read image data is sent to the encoding / decoding control unit 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.
[0050]
Although not particularly illustrated, the operation panel 10 has a touch panel unit together with a group of keys such as a numeric keypad, and functions as an input unit used by a user to input a facsimile number of a partner or various information, It has a function as a display part which performs a predetermined display with respect to a user.
[0051]
The panel control unit 2 controls the operation panel 10, detects an operator's key input, and transmits it to the main control unit 1. Further, based on the display information from the main control unit 1, the information is displayed on the display unit of the operation panel 10.
[0052]
The image information memory 6 stores facsimile transmission data read by the reading unit 11 and facsimile reception data in accordance with an instruction from the main control unit 1. At the time of facsimile transmission, the facsimile transmission data encoded by the encoding / decoding control unit 7 is stored. 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 also transfers data to the modem 9 in accordance with an instruction from the main control unit 1.
[0053]
The control memory 4 is a memory used primarily by the main control unit 1 when controlling peripheral circuits such as the modem 9 and the NCU 8.
[0054]
The registration data memory 5 (storage means) is a memory for storing various registration information such as a destination facsimile number, volume, and dial signal type input by the user using the operation panel 10. The registered data memory 5 is also registered with information indicating whether or not communication to the destination is via a private branch exchange, along with the destination facsimile number.
[0055]
The encoding / decoding control unit 7 encodes and decodes image data necessary for facsimile communication in accordance with an instruction from the main control unit 1, and encodes the read transmission data during facsimile transmission, When receiving, the received data is decrypted.
[0056]
The modem 9 performs transmission / detection of a DTMF signal, signal transmission used during 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 modulation / demodulation of a procedure signal. V. of series recommendation. 8, V. 21, V.R. 34, and for V. modulation / demodulation of image signals. 27ter, V.I. 29, V.R. 17, V. 34 functions. The modem 9 constitutes the identification signal transmitting means in the present invention with the main control unit 1, and in the case of facsimile communication via a private branch exchange in accordance with an instruction from the main control unit 1, And V. Before entering the 8 steps, an identification signal, which is a CED signal in this case, can be sent to the private branch exchange to recognize that it is facsimile communication.
[0057]
The NCU (network control unit) 8 is connected to a terminal of the line to use the telephone network for data communication or the like, and controls connection of the telephone exchange network or switches to a data communication path. It is.
[0058]
The main control unit 1 controls the block 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 that the V. CED signal is sent out before entering 8 procedures. Further, here, when the destination to which the user transmits a facsimile is input using the operation panel 10, the main control unit 1 performs communication to the destination based on the registration information in the registration data memory 5. It is determined whether or not to go through a private branch exchange.
[0059]
In the case of this digital multi-function peripheral, the image information memory 6, the encoding / decoding control unit 7, the NCU 8, and the modem 9 are unitized, and the number of lines can be increased by adding the unit as an option. It can be done.
[0060]
FIG. 2 shows a telephone / facsimile communication system including the digital multi-function peripheral. Originally, the communication system is composed of a large number of business office groups. Here, for convenience, it is assumed that business offices A and B are configured.
[0061]
A large number of facsimile machines (FAX) 21A ... and telephones (TEL) 20A ... in the A office and a large number of facsimile machines 21B ... and telephones 20B in the B office are all private branch exchanges 22A, 22B in the respective offices. 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.
[0062]
The digital multifunction peripheral 100 is additionally provided with a new line 2 as an option, and is connected to the public network switch 24 via the public line and also to the private branch exchange 22A.
[0063]
Next, a communication sequence example in facsimile communication between offices in the communication system will be described with reference to FIGS.
[0064]
FIGS. 3A and 3B are communication sequences in the case where facsimile transmission is performed from the digital multifunction peripheral 100 at the A office to the facsimile machine 21B at the B office via the private branch exchanges 22A and 22B at each office. In the example shown in FIG. 34 having an ANSam signal (with ANSam signal), in FIG. 34 No communication function (ANSam signal is not provided).
[0065]
As shown in FIGS. 4A and 4B, in the digital multifunction peripheral 100 on the calling side, since communication is performed via the private branch exchanges 22A and 22B, the CED signal is used as the first procedure when making a call. Is sent out. With this CED signal, each private branch exchange 22A / 22B of each office determines that the communication is facsimile communication and does not perform band compression.
[0066]
Here, the facsimile machine 21B of the business office B, which is the incoming call side, receives the V.B. In the case of a device having a 34 communication function, as shown in FIG. 8 procedures are entered and an ANSam signal (a signal obtained by modulating 2100 Hz with 15 Hz) is transmitted.
[0067]
When receiving the ANSam signal, the calling digital multifunction peripheral 100 receives the ANSam signal, which is a full-duplex communication procedure. 8 procedures are performed, 34 procedures and V.V. 34, the image signal is transmitted.
[0068]
That is, in the case of full-duplex communication, when the digital multifunction peripheral 100 receives the ANSam signal from the called side, A CM signal by 8 modulation is transmitted, and the caller side is notified of a transmission mode that is effective in the transmission of the image signal by this CM signal.
[0069]
When the callee receives the CM signal, it stops sending the ANSam signal. A JM signal by 8 modulation is transmitted. The called side notifies the calling side of a transmission mode that can be executed by the called side among the executable transmission modes notified by the CM signal by the JM signal.
[0070]
When receiving the JM signal, the digital multifunction peripheral 100 on the calling side stops sending the CM signal. Send 8 modulation CJ signal. The digital multifunction peripheral 100 on the calling side notifies the called side of the transmission mode determined based on the JM signal by the CJ signal.
[0071]
When the called party receives the CJ signal, it stops sending the JM signal and proceeds to a process for receiving the line probing signal from the calling party.
[0072]
The calling digital multifunction peripheral 100 sends a line probing signal (a signal modulated by V.34) for checking the status of the line 2 after a predetermined time has elapsed after stopping sending the CJ signal. .
[0073]
When the called party receives a line probing signal, it sends a response signal (V.34 modulated signal) to this line probing signal, and this response signal causes the subsequent signal transmission level, amplitude level correction, and transmission baud rate. Is sent to the calling side, and the process proceeds to receiving a long training signal from the calling side.
[0074]
Upon receipt of the response signal, the calling digital multifunction peripheral 100 stops sending the line probing signal, and the V. 34 modulation long training signal is sent out.
[0075]
The called party performs processing such as adjustment of the equalizer of the modem, timing detection, and the like by this long training signal.
[0076]
The calling digital multifunction peripheral 100 transmits the V.V. after a predetermined time has elapsed after the transmission of the long training signal. A 34 modulation parameter exchange signal is transmitted.
[0077]
When the called party receives the parameter conversion signal, V. A 34-modulation 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. The called party then receives the parameter exchange response signal and the T.P. 30 recommended CSI and DIS signals. 34 is transmitted by modulation, and further, T.M. Flags are sent out until a 30-recommended TS1, DCS signal is received.
[0078]
When receiving the CSI and DIS signals, the calling digital multifunction peripheral 100 stops sending parameter exchange signals. After sending TSI and DCS signals by 34 modulation, flags are sent until a CFR signal is received from the called side.
[0079]
When the called side receives the TSI and DCS signals from the calling side, it stops sending the flag. A CFR signal is transmitted by 34 modulation.
[0080]
When receiving the CFR signal, the calling-side digital multi-function peripheral 100 stops sending the flag, and after a predetermined time has passed, sends the image signal according to the transmission mode set in the previous procedure, and the called-side is set. The image signal is received according to the transmission mode.
[0081]
After transmitting the image signal for one page, when the digital multifunction peripheral 100 on the calling side transmits the image signal for the next page in the transmission mode as it is, the PPS-MPS after a predetermined time has elapsed from the end of the transmission of the image signal. After sending the signal, the flag is sent until the MCF signal is received from the called side. When the transmission mode is changed and the next page is transmitted, a PPS-EOM signal is sent instead of the PPS-MPS signal.
[0082]
When the called party receives the PPS-MPS signal, it sends the MCF signal and then proceeds to the image signal receiving process for the next page.
[0083]
Upon receiving the MCF signal, the calling digital multifunction peripheral 100 stops sending the flag, and sends the image signal of the next page after a predetermined time has elapsed. 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 predetermined time has elapsed, and then a flag is transmitted until an MCF signal is received from the called side.
[0084]
Then, the called party receives the PPS-EOP signal and sends out an MCF signal. Upon receiving this MCF signal, the calling digital multifunction peripheral 100 stops sending the flag and sends out a DCN signal.
[0085]
On the other hand, the facsimile machine 21B on the called side is set to V.16. If the device does not have the 34 communication function, as shown in FIG. The NSF signal, the CSI signal, and the DIS signal are sequentially transmitted according to 21 procedures.
[0086]
Here, since this digital multi-function peripheral that is the calling side does not receive the ANSam signal, the facsimile machine of the destination is the V.S. 34 It is determined that the communication function is not provided, After receiving the NSF, CSI, and DIS signals of the 21 steps, V.V. NSS, TSI, and DCS signals are sequentially transmitted in 21 steps. V. Since the description of the communication sequence of the apparatus having no 34 communication function is widely known, it is omitted here for convenience of description.
[0087]
4A and 4B show communication when facsimile transmission is performed 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. This is an example of a sequence, and FIG. 34 (b) shows that the facsimile machine 21 at the B office is a V.34 communication function. This is a case where the communication function is not provided.
[0088]
In this digital multi-function peripheral 100, as shown in FIGS. 4A and 4B, when an incoming call is received, a CED signal is transmitted as the first procedure. Respond with ANSam signal of 8 steps. Based on the CED signal output at this time, each private branch exchange 22A / 22B of each office determines that the communication is facsimile communication and does not perform band compression.
[0089]
Here, the facsimile machine 21B of the business office B, which is the calling party, makes V. If the apparatus has a communication function (with CM), the other party, that is, the digital multi-function peripheral 100, in response to the ANSam signal response, as shown in FIG. It is determined that the communication function is provided. A CM signal according to 8 procedures is transmitted. Since the subsequent description is the same as FIG. 3A, the description is omitted for convenience.
[0090]
On the other hand, the facsimile machine 21B of the business office B, which is the calling side, makes V. If the device does not have a communication function (without CM), as shown in FIG. The NSF signal, the CSI signal, and the DIS signal are sequentially transmitted according to 21 procedures. Here again, the following description is omitted for convenience.
[0091]
Next, the call-side control and the call-side control in the digital multi-function peripheral 100 belonging to the communication system of FIG. 2 will be described using the flowcharts of FIGS.
[0092]
In FIG. 5, in S1, first, various circuits such as the NCU 8 and the modem 9 shown in FIG. 1 are initialized.
[0093]
Next, in S2 and S3, it is determined whether a call is made or an incoming call is selected, and if a call is selected, the process proceeds to S4, and if an incoming call is selected, the process proceeds to S41 in FIG.
[0094]
In S4, line connection is performed. That is, the CML is turned on, and the destination facsimile number is dialed to the designated line using the DTMF signal generator in the modem 9 or the dialer in the NCU 8 according to the key input from the operation panel 10 shown in FIG. Send out as a signal.
[0095]
In S5, a predetermined time is set in the timer T1, and the process proceeds to S6. In S6, it is determined whether or not the communication is via at least one of the private branch exchanges 22A and 22B. The determination as to whether or not the private branch exchanges 22 </ b> A and 22 </ b> B are routed here is based on the registration information in the registration data memory 5.
[0096]
If the communication is not via 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 via at least one of the private branch exchanges 22A and 22B, a CED signal for recognizing that the communication is facsimile communication is shown in FIG. After sending from the modem 9, the process proceeds to S8.
[0097]
In S8, a signal is received from the other party (incoming side), and in S9, S10, and S11, the presence / absence of reception is determined. When the signal is received, the process proceeds to S21 in FIG. 6. In S10, when the ANSam signal is received, the process proceeds to S23 in FIG. Then, it is determined as an error, and the predetermined error processing of S12 is started.
[0098]
In S21 shown in FIG. It is determined whether it has 8 functions (V.8 procedure is possible). If it has 8 functions, the process proceeds to S22. V. If it does not have 8 functions, the process proceeds to S30, and the V. 21 steps are performed in half-duplex communication, that is, V. 27ter, V. 29, V.R. 17 image transmissions are performed.
[0099]
On the other hand, in S22, V.I. A CI signal that is a signal of 8 procedures (notifying that the V.8 procedure is possible is sent to the called party by this CI signal). In S23, the ANSam signal is received, and when the ANSam signal is received, the process proceeds to S24 and the V.S. An 8-procedure CM signal is transmitted. At the same time V. The eight-procedure JM signal is received (S25). If the JM signal is received, the process proceeds to S29. If the JM signal is not received, the process proceeds to S26.
[0100]
In S26, it is determined whether or not the transmission of the CM signal is completed. If the JM signal is not received in S25 until the transmission of the CM signal is completed, it is determined that full duplex communication is not possible, and the process proceeds to S27. move on.
[0101]
In S27 and S28, it is determined whether or not the NSF, CSI, and DIS signals are received before the timer T1 expires. If the NSF, CSI, and DIS signals are received, the process proceeds from S27 to S30. 21 procedures are performed, and a procedure signal is transmitted and received by half-duplex communication. When the timer T1 expires, the error processing of S12 is started.
[0102]
On the other hand, when the JM signal is received in S25, the process proceeds to S29, where 8 steps CJ signal is transmitted, and thereafter, the process proceeds to S31 to enter full duplex communication. 34 procedures. 34 communication image transmission is executed.
[0103]
On the other hand, if it is determined in S3 in FIG. 5 that the call is an incoming call and the process proceeds to S41 in FIG. 7, line connection is made in S41, the CML is turned on, and the process proceeds to S42.
[0104]
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 information registered in the registration data memory 5. If the communication is not via any of the private branch exchanges 22A and 22B, the process proceeds to S44 as it is. On the other hand, if it is determined that the communication is via at least one of the private branch exchanges 22A and 22B, the CED signal for recognizing the facsimile communication is sent from the modem 9 shown in FIG. After sending out, the process proceeds to S44.
[0105]
In S44, transmission of the ANSam signal is started. In S45, V.I. If the CM signal is received before receiving the ANSam signal transmission in S50 after receiving the CM signal in 8 steps, the process proceeds to S46. When the CM signal of 8 procedures is transmitted and reception of the ANSam signal is terminated without receiving the CM signal, the process proceeds to S51.
[0106]
The case where the process proceeds to S46 is a case where the CM signal can be received during the ANSam signal transmission and the full duplex communication is possible. If the JM signal of 8 steps is transmitted and the CJ signal is received in S47 until the end of transmission of the JM signal is confirmed in S49, full duplex communication is possible again, so the process proceeds to S55. . 34 procedures. 34 image reception continues.
[0107]
On the other hand, if the CJ signal cannot be received in S48 and S49 and the transmission of the JM signal is completed, it is determined that full-duplex communication is not possible, and the process proceeds to S49, where the V.S. 8 Set the information without function, send the NSF, CSI, DIS signal and proceed to S56. 21 procedure is performed. 27ter, V. 29, V.R. 17 images are received.
[0108]
In S51, V.I. NSF, CSI, and DIS signals are transmitted according to 21 procedures. Here, the V.V. Notify the transmitter that there are 8 functions. In S52, it is checked whether or not a CI signal (V.8 procedure signal) is received. If no CI signal is received, the process proceeds to S56. 21 procedure is performed. 27ter, V. 29, V.R. 17 images are received.
[0109]
As described above, in the digital multifunction peripheral 100, the V. Before entering the eight procedures, each private branch exchange 22A, 22B is sent with an identification signal that can recognize that the communication is a facsimile communication.
[0110]
As a result, even if the called facsimile machine receives 34 Even if a device having a communication function does not transmit a CED signal and responds with a full-duplex communication ANSam signal, each private branch exchange 22A / 22B used for the communication is Recognizing that the communication is facsimile communication and not performing band compression, V.V. through a private branch exchange, which could not be performed because of the conventional inability to communicate or slow communication speed. 34 communication can be performed.
[0111]
Further, in the digital multi-function peripheral 100, when a call is received, the V.V. Before entering the eight procedures, each private branch exchange 22A, 22B is sent with an identification signal that can recognize that the communication is a facsimile communication.
[0112]
As a result, each private branch exchange 22A / 22B used for the communication recognizes that the communication is a facsimile communication with the identification signal transmitted from the called side and does not perform band compression. V.V. through a private branch exchange that could not be performed because communication was disabled or communication speed was slow. 34 communication can be performed.
[0113]
Further, in this digital multi-function peripheral 100, conventionally, each private branch exchange 22A, 22B uses the CED signal that the communication is determined to be facsimile communication as an identification signal. In comparison, the data communication apparatus of the present invention can be applied without changing the configuration / setting on the private branch exchange 22A / 22B side, and the effect can be obtained.
[0114]
Further, in the digital multi-function peripheral 100, information on whether or not communication by the facsimile number is transmitted through the private branch exchanges 22A and 22B together with the counterpart facsimile number is stored in the registration data memory 5 as destination information, and the main control is performed. The unit 1 determines whether or not the facsimile communication is via at least one of the private branch exchanges 22A and 22B based on the stored counterpart information, and at least one of the private branch exchanges 22A and 22B. If it is determined that the facsimile communication is via the network, an identification signal is transmitted.
[0115]
As a result, as in the digital multi-function peripheral 100, there is a facsimile communication that has a plurality of lines and is connected to each private branch exchange 22A / 22B by one apparatus, or a facsimile communication that is directly performed via a public line. In such a case, since the identification signal is automatically transmitted only when it is necessary without the user having to designate each time every facsimile transmission, the operability is good.
[0116]
It should be noted that the configuration may be such that the identification signal is always transmitted during facsimile communication regardless of whether the private branch exchanges 22A and 22B are not used. Since unnecessary time is required, it is necessary to reduce the communication time. This is partly contrary to the purpose of the 34 communication.
[0117]
In the digital multi-function peripheral 100, the main control unit 1 is configured to determine whether or not the communication is via one of the private branch exchanges 22A and 22B based on the information in the registered data memory 5. If the apparatus has one line and is installed so that facsimile communication is always performed via the private branch exchange, a switching switch (identification signal transmission switching means) for switching whether or not to transmit the identification signal is provided in the apparatus body. Only when the changeover switch is switched to the side where the identification signal is transmitted, the identification signal may be transmitted when a call is made or when a call is received.
[0118]
Here, the configuration in which the present invention is mounted on the digital multi-function peripheral has been described as an example. However, the present invention is not limited to a data communication apparatus capable of full-duplex communication that performs procedure signal communication and data communication. All are applicable.
[0119]
As described above, the data communication apparatus of the present invention transmits and receives procedure signals by full duplex communication. In a data communication apparatus, when a call is made, V. It is characterized by having 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 entering the eight procedures.
[0120]
According to this, V. Before entering 8 procedures, an identification signal indicating that the communication is facsimile communication is sent from the identification signal sending means. Therefore, even if the data communication device on the called side is V.D. 34 Even if a device having a communication function does not send out a CED signal and responds with an ANSam signal of full duplex communication, the private branch exchange is transmitted from the data communication device of the present invention on the calling side. The identification signal recognizes that the communication is facsimile communication and does not perform band compression.
[0121]
As a result, communication becomes impossible and communication speed becomes slow, so that V.V. 34 communication can be performed without problems.
[0122]
As described above, the data communication apparatus of the present invention is a data communication apparatus that transmits and receives procedure signals by full duplex communication. It is characterized by having 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 entering the eight procedures.
[0123]
According to this, V. Before entering 8 procedures, an identification signal indicating that the communication is facsimile communication is sent from the identification signal sending means. Therefore, the private branch exchange recognizes that the communication is facsimile communication from the identification signal transmitted from the data communication device of the present invention on the called side, and does not perform band compression.
[0124]
As a result, communication becomes impossible and the communication speed becomes slow, so that the V.V. 34 communication can be performed without any problem.
[0125]
The data communication apparatus according to the present invention includes an identification signal transmission switching unit that enables switching of the identification signal transmission by the identification signal transmission unit in the data communication apparatus described above, wherein the identification signal transmission unit includes the identification signal transmission unit. When the signal transmission switching means is switched to the identification signal transmission side, the identification signal is transmitted.
[0126]
Regardless of whether a private branch exchange is used or not, a configuration in which an identification signal is always transmitted at the time of facsimile communication may be used. However, in this case, since the identification signal is output even when it is not necessary, it takes time. V. such as shortening the communication time. This is against the purpose of the 34 communication. Therefore, it is desirable to output the identification signal only during facsimile communication via the private branch exchange, and it is desirable to be able to designate whether or not to send the identification signal.
[0127]
On the other hand, there is a case where the data communication apparatus is always installed so as to transmit via the private branch exchange, and in this case, the user must designate that the identification signal is transmitted every time the facsimile transmission is performed, which is bothersome. .
[0128]
According to the above configuration, the identification signal transmission switching means that enables switching whether or not the identification signal is transmitted is provided, and when the identification signal transmission switching means is switched to the identification signal transmission side, the identification signal is transmitted. Since the information is transmitted, the user can specify the presence / absence of transmitting the identification signal by operating the identification signal transmission switching means.
[0129]
As a result, it is not necessary to designate whether or not the identification signal is transmitted every time facsimile transmission is performed, and the operability is improved.
[0130]
The data communication apparatus according to the present invention stores destination information such as a destination facsimile number input from the input means in the data communication apparatus described above, and communication using the destination facsimile number and the facsimile number is on-site. Storage means for storing information as to whether or not the communication is via an exchange is provided, and the identification signal sending means determines whether or not the facsimile communication is via a private branch exchange based on the destination information stored in the storage means. When it is determined that the facsimile communication is via the private branch exchange, an identification signal is transmitted.
[0131]
Recently, a data communication apparatus having a plurality of lines has been used. In such a data communication apparatus, the identification signal transmission switching means cannot collectively specify whether or not to transmit the identification signal, and the facsimile transmission. It is necessary for the user to specify each time.
[0132]
On the other hand, according to the above configuration, the user registers, for example, information on whether or not communication by the facsimile number is communication via the private branch exchange together with the destination facsimile number using an input means such as a touch panel. By determining whether the identification signal sending means is a facsimile communication via the private branch exchange based on the information stored in the storage means, only when the facsimile communication is via the private branch exchange, An identification signal is transmitted.
[0133]
Therefore, even if the user does not specify whether or not to transmit the identification signal every time the facsimile transmission is performed, the identification signal is automatically transmitted only when necessary, so that the operability is improved.
[0134]
The data communication device of the present invention is characterized in that, in the data communication device described above, the identification signal is a CED signal.
[0135]
Conventionally, when a private branch exchange detects a CED signal, the private branch exchange determines that the communication is facsimile communication. Therefore, the private branch exchange uses the CED signal as an identification signal that allows the private branch exchange to recognize that the communication is the facsimile communication of the present invention. Thus, the data communication apparatus of the present invention can be applied and an effect can be obtained without changing the configuration / setting on the private branch exchange side as compared with the case where other signals are used as identification signals.
[0136]
【The invention's effect】
The data communication apparatus of the present invention is as described above.In proxy communicationData communication device that transmits and receives procedure signals by full duplex communicationA data communication apparatus for performing communication via a private branch exchange that does not perform band compression in the case of facsimile communication while performing band compression of a voice signal when communication is a telephone.At the time of a callIn addition,V. of full duplex communication. Before entering 8 steps, let the private branch exchange recognize that the communication is a facsimile communication.ForAn identification signal sending means for sending an identification signal;Storing destination information such as a destination facsimile number input from the input means, and storing means for storing, together with the destination facsimile number, information indicating whether communication by the facsimile number is via a private branch exchange, The identification signal sending means determines whether or not the facsimile communication is via a private branch exchange based on the destination information stored in the storage means. Send a signalIt is a configuration.
[0137]
As a result, the private branch exchange can transmit and receive a procedure signal by full duplex communication. 34 communication, even if the caller does not respond with a CED signal, the identification signal transmitted from the caller recognizes that the communication is facsimile communication and does not perform band compression.
[0138]
As a result, communication becomes impossible and communication speed becomes slow. 34 communication can be implemented without problems.
[0139]
As a result, the user registers the information on whether or not the communication by the facsimile number is a communication through the private branch exchange together with the destination facsimile number, so that the identification signal is not necessary or necessary automatically. Even if it is a data communication apparatus having a plurality of lines and the identification signal transmission switching means cannot collectively specify whether or not to transmit the identification signal, it is determined each time the facsimile transmission is performed. It is not necessary to specify whether or not to transmit the identification signal.
[0140]
As a result, V.C. It also has the effect that operability can be improved without violating the purpose of the 34 communication.
[0141]
The data communication apparatus of the present invention is as described above.In facsimile communicationData communication device that transmits and receives procedure signals by full duplex communicationA data communication apparatus for performing communication via a private branch exchange that does not perform band compression in the case of facsimile communication while performing band compression of a voice signal when communication is a telephone.At the time of an incoming callIn addition,V. of full duplex communication. Before entering 8 procedures, let the private branch exchange recognize that the communication is facsimile communicationforIdentification signal sending means for sending identification signalStorage means for storing destination information such as a destination facsimile number input from the input means, and storing information on whether or not communication by the facsimile number passes through the private branch exchange together with the destination facsimile number. The identification signal sending means determines whether or not the facsimile communication is via a private branch exchange based on the destination information stored in the storage means, and if it is determined that the facsimile communication is via a private branch exchange, Send the identification signalIt is the structure to do.
[0142]
As a result, the private branch exchange can transmit and receive communication procedure signals by full duplex communication. Even if the communication is 34 communication and responds with an ANSam signal, first, the identification signal transmitted first recognizes that the communication is facsimile communication and does not perform band compression.
[0143]
As a result, communication becomes impossible and communication speed becomes slow. 34 communication can be implemented without problems.
[0144]
As a result, the user registers the information on whether or not the communication by the facsimile number is a communication through the private branch exchange together with the destination facsimile number, so that the identification signal is not necessary or unnecessary automatically. Even if it is a data communication apparatus having a plurality of lines and the identification signal transmission switching means cannot collectively specify whether or not to transmit the identification signal, it is determined each time the facsimile transmission is performed. It is not necessary to specify whether or not to transmit the identification signal.
[0145]
As a result, V.C. It also has the effect that operability can be improved without violating the purpose of the 34 communication.
[0146]
As described above, the data communication apparatus of the present invention is a data communication apparatus that transmits and receives a procedure signal by full duplex communication in facsimile communication, and performs band compression of an audio signal when the communication is a telephone. In the case of facsimile communication, in a data communication apparatus that communicates via a private branch exchange that does not perform the band compression, the V. Before entering 8 procedures, a signal used for recognizing that the communication is a facsimile communication in the communication in which the private branch exchange transmits a procedure signal by half-duplex communication to the private branch exchange is transmitted as an identification signal. And an identification signal sending means.
[0147]
As described above, the data communication apparatus of the present invention is a data communication apparatus that transmits and receives a procedure signal by full duplex communication in facsimile communication, and performs band compression of an audio signal when the communication is a telephone. Private branch exchange that does not perform band compression in the case of facsimile communication In a data communication apparatus that communicates via a V., when a call is received, V. Before entering 8 procedures, a signal used for recognizing that the communication is facsimile communication in the communication in which the private branch exchange transmits a procedure signal by half duplex communication to the private branch exchange is sent as an identification signal. And an identification signal sending means.
[0148]
As described above, the data communication apparatus of the present invention is a data communication apparatus that transmits and receives a procedure signal by full duplex communication in facsimile communication, and performs band compression of an audio signal when the communication is a telephone. In the case of facsimile communication, in a data communication apparatus that communicates via a private branch exchange that does not perform the band compression, V. Before entering 8 procedures, a signal used for recognizing that the communication is facsimile communication in the communication in which the private branch exchange transmits a procedure signal by half duplex communication to the private branch exchange is sent as an identification signal. And an identification signal sending means.
[0149]
Also in these cases, the destination information such as the destination facsimile number input from the input means is stored, and information on whether or not communication by the facsimile number goes through the private branch exchange together with the destination facsimile number. Storing means for storing, wherein the identification signal sending means judges whether or not the facsimile communication is via the private branch exchange based on the destination information stored in the storage means, and the facsimile communication via the private branch exchange is used. If it is determined that there is, the identification signal may be transmitted.
[0150]
Each data communication apparatus of the present invention described above further comprises identification signal transmission switching means for enabling switching of whether or not the identification signal is transmitted by the identification signal transmission means, and the identification signal transmission means is configured to switch the identification signal transmission. When the means is switched to the side with identification signal transmission, the identification signal is transmitted.It can also be configured.
[0151]
As a result, it is possible for the user to collectively specify whether or not the identification signal is to be transmitted by the identification signal transmission switching means, so that the facsimile can be used when the data communication apparatus is always installed to transmit through the private branch exchange. It is not necessary to designate whether or not the identification signal is transmitted every time transmission is performed.
[0152]
As a result, V.C. 34 It is also possible to improve the operability without violating the purpose of communication.
[0153]
Furthermore, in each data communication apparatus of the present invention described above, a CED signal can be used as the identification signal for a private branch exchange that recognizes that the communication is facsimile communication by a CED signal. .
[0154]
As a result, compared with the case where another signal different from the CED signal is used as the identification signal, the data communication device of the present invention can be applied as it is without changing any configuration / setting on the private branch exchange side. Play together.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a digital multifunction peripheral according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a telephone / facsimile communication system to which the digital multifunction peripheral belongs.
FIGS. 3A and 3B 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.
4A and 4B 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 showing a control procedure of facsimile communication in the digital multi-function peripheral.
FIG. 6 is a flowchart showing a control procedure of facsimile communication in the digital multi-function peripheral.
FIG. 7 is a flowchart illustrating a control procedure of facsimile communication in the digital multi-function 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]
1 Main control unit (identification signal sending means)
5 Registration data memory (storage means)
9 Modem (identification signal sending means)
10 Operation panel (input means)

Claims (8)

A data communication apparatus that transmits and receives a procedure signal by full-duplex communication in facsimile communication, and performs band compression of a voice signal when the communication is a telephone, but does not perform band compression when the communication is a facsimile communication. In a data communication device that communicates via a private branch exchange ,
V. of full duplex communication at the time of call origination. Before entering 8 procedures, an identification signal sending means for sending an identification signal for making the private branch exchange recognize that the communication is a facsimile communication;
Storing destination information such as a destination facsimile number input from the input means, and storing means for storing, together with the destination facsimile number, information indicating whether communication by the facsimile number is via a private branch exchange,
The identification signal sending means determines whether or not the facsimile communication is via a private branch exchange based on the destination information stored in the storage means. A data communication apparatus for transmitting a signal . A data communication apparatus that transmits and receives a procedure signal by full-duplex communication in facsimile communication, and performs band compression of a voice signal when the communication is a telephone, but does not perform band compression when the communication is a facsimile communication. In a data communication device that communicates via a private branch exchange ,
When an incoming call is received, V. Before entering the 8 steps, and the identification signal transmitting means for transmitting an identification signal for recognizing that it is the communication facsimile communication with respect to the private branch exchange,
Storing destination information such as a destination facsimile number input from the input means, and storing means for storing, together with the destination facsimile number, information indicating whether communication by the facsimile number is via a private branch exchange,
The identification signal sending means determines whether or not the facsimile communication is via a private branch exchange based on the destination information stored in the storage means. A data communication apparatus for transmitting a signal . A data communication apparatus that transmits and receives a procedure signal by full-duplex communication in facsimile communication, and performs band compression of an audio signal when the communication is a telephone, but does not perform band compression when the communication is a facsimile communication. In a data communication device that communicates via a private branch exchange,
  V. of full duplex communication at the time of calling. Before entering 8 procedures, a signal used for recognizing that the communication is a facsimile communication in the communication in which the private branch exchange transmits a procedure signal by half-duplex communication to the private branch exchange is transmitted as an identification signal. A data communication apparatus comprising identification signal transmission means for performing A data communication apparatus that transmits and receives a procedure signal by full-duplex communication in facsimile communication, and performs band compression of an audio signal when the communication is a telephone, but does not perform band compression when the communication is a facsimile communication. In a data communication device that communicates via a private branch exchange,
  When an incoming call is received, V. Before entering 8 procedures, a signal used for recognizing that the communication is facsimile communication in the communication in which the private branch exchange transmits a procedure signal by half duplex communication to the private branch exchange is sent as an identification signal. A data communication apparatus comprising identification signal transmission means for performing A data communication apparatus that transmits and receives a procedure signal by full-duplex communication in facsimile communication, and performs band compression of an audio signal when the communication is a telephone, but does not perform band compression when the communication is a facsimile communication. In a data communication device that communicates via a private branch exchange,
  V. of full duplex communication at the time of outgoing and incoming calls. Before entering 8 procedures, a signal used for recognizing that the communication is a facsimile communication in the communication in which the private branch exchange transmits a procedure signal by half-duplex communication to the private branch exchange is transmitted as an identification signal. Identification signal sending means A data communication apparatus comprising: An identification signal transmission switching means for enabling switching of whether or not the identification signal is transmitted by the identification signal transmission means;
6. The identification signal transmitting means transmits an identification signal when the identification signal transmission switching means is switched to an identification signal transmitting side . Data communication device. Stores destination information such as a destination facsimile number input from the input means, and includes storage means for storing information on whether or not communication by the facsimile number passes through the private branch exchange together with the destination facsimile number.
  The identification signal sending means determines whether or not the facsimile communication is via a private branch exchange based on the destination information stored in the storage means. 6. The data communication apparatus according to claim 3, wherein the data communication apparatus transmits a signal. The data communication according to any one of claims 1 to 7, wherein a CED signal is used as the identification signal for a private branch exchange that recognizes that the communication is a facsimile communication by a CED signal. apparatus.

Images