JPH10290355A - Facsimile equipment and facsimile communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a facsimile equipment and a facsimile communication method by which it is avoided that a training signal is mis-recognized to be a signal instructing transfer of abbreviation protocol in the case of the abbreviation protocol. SOLUTION: Reception of an EPT signal transmitted prior to the transmission of image information from a transmitter and an FPT signal instructing transfer to the abbreviation protocol is awaited (steps 400, 402) and in the case of receiving the FPT signal, the reception phase B (command reception phase) is selected (step 404) and in the case of receiving the EPT signal, a training signal is received and the processing is awaited till training is successful (step 406).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a facsimile apparatus and a facsimile communication method, and more particularly, to a facsimile apparatus having a function of executing a shortened protocol procedure and a facsimile communication method using the facsimile apparatus.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the time of a communication procedure (protocol) performed before transmission / reception of image information in a facsimile apparatus, a shortening protocol unique to a facsimile apparatus manufacturer has been adopted.

In the conventional receiving-side facsimile apparatus at the time of communication using such a shortened protocol, a training signal is received after completion of preparation for receiving a facsimile message to determine success of training, and a high-speed NSS is continuously transmitted. And a signal instructing the shift to the shortened protocol is detected.

[0004]

However, the above-mentioned prior art is described in ITU-T Recommendation V. 17 when applied to ITU-T Recommendation V.17. In the 17-step training,
A signal of 1800 Hz component is about 106 ms in segment 1.
Since the signal is transmitted, if the line condition is poor, the segment 1 of the training may be erroneously recognized as a signal (for example, 600 Hz) instructing the shift to the shortened protocol. In this case, the image information training is performed. In spite of the above, there is a problem that the process is shifted to the command receiving phase by misunderstanding that the high-speed NSS signal / (TSI signal) is retransmitted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and can prevent a training signal from being erroneously recognized as a signal instructing a shift to the shortened protocol at the time of the shortened protocol communication. An object of the present invention is to provide a facsimile apparatus and a facsimile communication method.

[0006]

According to another aspect of the present invention, there is provided a facsimile apparatus having a communication unit having a function of executing a shortened protocol procedure, and a shift to the shortened protocol before receiving image information. And a detecting means for detecting both of the echo protect tone signal, and if the detecting means detects an echo protect tone signal, a training signal is detected to determine whether or not the training was successful. And determination means for determining.

According to the facsimile apparatus of the first aspect, when executing the shortened protocol procedure by the communication means, a signal instructing a shift to the shortened protocol before receiving the image information, and subsequently transmitting the image information. Echo protection tone signal (so-called EP
T signal) is detected by the detection means, and when the echo protection tone signal is detected by the detection means, the determination means detects the training signal to determine whether the training is successful. You.

According to a second aspect of the present invention, there is provided a facsimile communication method, wherein when executing the shortened protocol procedure, a signal instructing a shift to the shortened protocol before receiving image information;
And the echo protect tone signal is detected. When the echo protect tone signal is detected, a training signal is detected to determine whether the training is successful.

Thus, according to the facsimile apparatus of the first aspect and the facsimile communication method of the second aspect,
When the echo protect tone signal is detected, the training signal is detected without detecting the signal instructing the shift to the shortened protocol. Therefore, the training signal is a signal for instructing the shift to the shortened protocol. Will not be mistakenly recognized.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram of the entire facsimile apparatus according to the present invention. This facsimile apparatus includes a CPU 1 for controlling the entire facsimile apparatus, a RAM 2 as a work area used when executing a control program, an operation display apparatus 3 provided with a display for operating the facsimile apparatus and operation switches, and a transmission document. A reading device 4 for reading; a printing device 5 for printing and outputting received image information; an image processing device 6 for performing image processing such as encoding / decoding / enlargement / reduction; storing image information to be transmitted or received image information An image storage device 7, a system control unit 8 including a ROM storing a program for controlling the entire facsimile machine, and a program for controlling communication (for example, G4) suitable for a digital network (for example, an ISDN network). The first communication control unit 9 composed of the stored ROM controls communication suitable for an analog network (for example, G3). A second communication control unit 10 composed of a ROM storing a program for performing a connection, a digital network control unit 11 for connecting to a digital network, an analog network control unit 13 for connecting to an analog network, A line switching control device 15 for connecting the external line interface to a plurality of internal communication circuits is connected to each other via a system bus 14.

Further, the first communication control unit 9 is mutually connected to the direct line switching control device 15, and the second communication control unit 1
Numeral 0 is mutually connected to a line switching control device 15 via a modem (modulator / demodulator) 12 having a low-speed mode and a high-speed mode. The line switching control device 15 is mutually connected to the digital network control device 11 and the analog network control device 13.

The facsimile apparatus having the above configuration is connected via a line to a partner machine such as a facsimile apparatus having the same configuration as described above, a facsimile apparatus which can be connected only to an analog network, and a facsimile apparatus which can be connected only to a digital network. You. When this facsimile apparatus is connected only to an analog network, the first communication control section 9 and the digital network control apparatus 11 can be omitted. Control unit 10, modem 1
2 and the analog network controller 13 can be omitted.

In the facsimile apparatus of the present embodiment, the mode shifts to the shortened protocol mode in the following cases (1) to (3) during transmission. (1) A case where the other party has stored the shortened protocol reception capability and the other party has a polarity reversal detection function, and a polarity reversal is detected (transmission time transition case 1). (2) CED before polarity inversion is detected in (1)
Is detected, the other party's information is stored as having the shortened protocol receiving capability, and the other party's machine does not have the polarity reversal detection function. When CED is detected by detection (Transmission time transition case 2). (3) When it is stored that the partner machine does not have the shortened protocol receiving capability, the CED or the command is detected while transmitting the CNG, and it is determined from the received NSF command of the own machine that the shortened protocol receiving capability is present. Case (Transmission transition case 3).

At the time of reception, a transition is made to the shortened protocol mode in the following cases (1) to (3). (1) A case where a signal instructing a shift to the shortened protocol mode is received during a period from the arrival of the call to the transmission of the CED (shift case 1 at the time of reception). (2) When a CED must be transmitted without receiving a signal instructing a shift to the short protocol mode after receiving a call, a signal indicating a shift to the short protocol mode is received while transmitting the CED. Then, when the CED transmission is stopped (transition case 2 at the time of reception). (3) When a CED has to be transmitted without receiving a signal instructing a shift to the short protocol mode after receiving a call, and receiving a signal instructing a shift to the short protocol mode while transmitting the CED. Was checked, but C was received without receiving a signal instructing the transition to the shortened protocol mode.
When the ED transmission is stopped, the NSF command and the DIS command (which indicate the C
(SI command), and receives a signal instructing a transition to the shortened protocol mode in response to this (transition case 3 during reception).

Next, the basic procedure of the shortening protocol is shown in FIG.
This will be described in detail with reference to FIGS. First, FIGS.
The transmission protocol will be described with reference to FIG.

In accordance with the speed dial operated by the operation display device 3 in step 100 of FIG. 2, the stored telephone number is read and a call is made.
At 04, it is determined whether or not it is stored in the RAM 2 of the own device that the partner device corresponding to the abbreviated dial operated has the shortened protocol receiving capability. If it is stored that there is the shortened protocol reception capability, a transmission phase A (FIG. 3) described later is executed in step 106.

In the next step 108, it is determined whether or not the transmission is in the short protocol mode. If the transmission is not in the short protocol mode, that is, if the transmission is in the normal transmission mode, the process proceeds to step 128. Executes transmission phase B (FIG. 4) described later in step 110, and determines in step 112 whether or not to transmit in the shortened protocol mode. In the case of the normal transmission mode, the process proceeds to step 128. In the case of the transmission in the short protocol mode, the transmission phase C (FIG. 5) described later in step 114 and the transmission phase D (FIG. 6) described later in step 116 are executed.

At step 118, it is determined whether or not to shift to the transmission phase C.
If not, it is determined in step 120 whether or not to proceed to the transmission phase B. If affirmative, the procedure proceeds to step 110. If not, that is, to the phase E, in step 122 A low-speed DCN (disconnection command signal) is transmitted, and the transmission is terminated.

On the other hand, if it is determined in step 104 that the short protocol reception capability is not stored, step 124
To send CNG, and while sending CNG, step 12
It is determined at step 6 whether a CED or a command has been received, and if affirmative, at step 128, it is determined whether an NSF has been received. If NSF is received,
In step 130, it is determined whether or not the NSF is of the same manufacturer as the own device. In the case of the NSF of the same manufacturer as in the own device, it is determined in step 132 whether or not the shortening protocol is available. If the reception capability of the shortened protocol is available, it is stored in the RAM 2 that the reception capability of the shortened protocol is available corresponding to the abbreviated dialing in step 134, the mode is shifted to the abbreviated protocol mode, and the process proceeds to step 110.

The transition to the abbreviated protocol mode after storing the capability of receiving the abbreviated protocol in step 134 corresponds to the transmission transition case 3 (FIG. 13).

If it is determined in step 128 that the reception is not NSF, that is, if DIS (digital identification signal) is received, and if the determinations in steps 130 and 132 are negative, a step 136 is performed in accordance with the speed dial to correspond to the speed dial. It stores in the RAM2 that there is no reception capability, and shifts to a normal transmission mode in step 138.

The transmission phase A will be described with reference to FIG. In step 140, it is determined whether or not the partner machine has a polarity inversion function based on the information stored in the RAM 2.
An NG transmission start timer is started, and it is determined in step 144 whether polarity inversion is detected. If the polarity inversion is not detected, the polarity inversion is detected in step 144 until it is determined in step 146 that the timeout has occurred. Then, when the polarity inversion is detected, the flow shifts to the short protocol mode in step 156, and the short protocol is executed as described later.

On the other hand, if the CNG transmission start timer times out in step 146,
NG is sent, and it is determined in step 150 whether polarity reversal has been detected. Then, when the polarity inversion is detected, the flow shifts to the short protocol mode mode in step 156, and the short protocol described later is executed.

The transition to the shortened protocol mode when the polarity reversal in steps 144 and 150 is detected corresponds to the transmission transition case 1 (FIG. 11).

If no polarity reversal is detected in step 150, it is determined in step 152 whether or not a CED has been received. If a CED has been received, the flow shifts to the short protocol mode in step 156.

If the CED is not received in step 152, it is determined in step 154 whether or not a low-speed command has been received. If the CED has been received, the process proceeds to step 164 in the normal transmission mode. In step 148, transmission of CNG is continued.

If it is determined in step 140 that there is no polarity inversion function, CNG is transmitted in step 158, and it is determined in step 160 whether CED is received.
If the CED has been received, the process moves to the short protocol mode in step 156.

The transition to the abbreviated protocol mode when the CED is received in steps 152 and 160 corresponds to the transmission transition case 2 (FIG. 12).

If no CED is received in step 160, it is determined in step 162 whether a low-speed command has been received. If a low-speed command has been received, the mode shifts to a normal transmission mode in step 164. In step 158, transmission of CNG is continued.

The transmission phase B will be described with reference to FIG. In step 170, it is determined whether or not polling is performed. In the case of polling, the procedure from step 190 is executed.
If the polling is not performed, an FPT signal indicating the transmission speed (communication speed) of the next high-speed NSS command (command signal in which a parameter to be transmitted is set) is transmitted in step 172, and the high-speed NSS is transmitted at this transmission speed in step 174. Then, in step 176, it is determined whether or not a response from the partner device has been received. On the receiving side, this step 17
F indicating the transmission rate of the high-speed NSS command transmitted in step 2.
Upon receiving the PT signal, the mode shifts to the shortened protocol mode as described later. Note that the FPT signal is a signal corresponding to a signal instructing a shift to the shortened protocol of the present invention.

If a response has been received, it is determined in step 178 whether or not the received response is a high-speed NSF (identification signal for which reception capability has been set).
If F is received, the flow shifts to the abbreviated protocol mode in step 180. If the high-speed NSF is not received, for example, if a low-speed command such as NSF / DIS is received, the flow shifts to the normal transmission mode in step 182. I do.

If the partner machine has a polarity reversal function, the polarity reversal is detected while waiting for a response, and if a timeout and a polarity reversal are detected while waiting for a response, the process proceeds from step 176. Step 184
If the polarity inversion is detected, the initial value of the transmission speed is reset in step 188. If the polarity inversion is not detected, the fallback parameter is set in step 186 and the process returns to step 172.

In the case of polling, an FPT signal indicating the transmission speed of the next high-speed NSC (non-standard function command signal) command is transmitted in step 190, the high-speed NSC is transmitted at this speed in step 192, and in step 194. It is determined whether or not a response from the partner device has been received. If a response has been received, it is determined in step 196 whether or not a high-speed NSS has been received from the partner device.
If S is received, a reception phase B (FIG. 8) described later is executed in step 198. If a high-speed NSS is not received, for example, if a low-speed command such as NSF / DIS is received, step S200 is executed. Shift to normal transmission mode.

Similarly to the above, if the other device has a polarity reversal function, the polarity reversal is also detected when waiting for a response, and when a response timeout and a polarity reversal are detected. Proceeds from step 194 to step 202. If polarity reversal is detected, the initial value of the transmission rate is reset in step 206. If polarity reversal is not detected, the fallback parameter is set in step 204 and Return to 190.

The transmission phase C will be described with reference to FIG. In the transmission phase C, the frame is divided into frames according to the ECM (error correction mode), and the first frame (frame No. 0) is set with parameters indicating image information of the second and subsequent frames following the first frame or NSS information, Image information (for example, image information of one page in one frame) is set and transmitted in the second and subsequent frames. Note that the EPT signal and the training signal are transmitted before transmitting the image information in the transmission phase C.

In step 210, it is determined whether or not the image information is to be retransmitted. In the case of retransmission, in step 212, the image information to be retransmitted is set in a frame and transmitted.
When it is determined that retransmission is completed, the process proceeds to step 222.

If the image information is not retransmitted, step 21
6 and the frame No. The information of the previously transmitted NSS is set to 0 and transmitted. In this case, the frame No. The information to be set to 0 may be the information of the previously transmitted NSS itself or only the parameter indicating the image information to be transmitted. As described above, since the NSS and parameters are transmitted as image information, high-speed transmission is possible.
In step 218, the image information is set and transmitted for the second and subsequent frames, and if it is determined in step 220 that the image information transmission has been completed, the process proceeds to step 222.

In step 222, an RCP (control return) frame in which the content of the post message command is set in the facsimile information field is transmitted,
The process proceeds to phase D for waiting for the next response command.

The transmission phase D will be described with reference to FIG. In step 230, it is determined whether or not a response has been received from the partner device. If a response has been received, it is determined whether or not the response received in step 232 is a low-speed MCF (message confirmation signal) command. . If a response is not received, a low-speed P.P. M. C (post message command), for example, PPS · Q (post message command) or PPS · PriQ (procedure interruption post message command).

If it is determined in step 232 that the response received is a low-speed MCF, the process proceeds to step 24.
2 which is set to RCP and transmitted. M. Based on the content of C, it is determined which of the transmission phases C, B, and E is to be shifted to next. Based on the determination result, the process shifts to the transmission phase C in step 244, and shifts to the transmission phase B in step 246. In step 248, the process proceeds to the transmission phase E.

If it is determined in step 232 that the received response is not a low-speed MCF, step 23
4 to determine whether the response received is a low-speed PPR (partial page request). If not, the response received in step 236 is a low-speed PIP.
(Procedure interruption affirmation signal). If the received response is a low-speed PIP, step 23
After executing the line hold procedure in step 8, the process proceeds to step 242. If the received response is not the low-speed PIP, the process proceeds to step 240 after performing error processing in step 240.

If it is determined in step 234 that the response received is low-speed PPR, step 252
To determine whether it is necessary to transmit CTC (correction continuation). If necessary, transmit low-speed CTC in step 254 until it is determined in step 256 that a low-speed CTR (correction continuation response) has been received. If the low-speed CTR has been received, the process proceeds to the transmission phase C in step 258.

If it is determined in step 252 that transmission of CTC is unnecessary, it is determined in step 260 whether or not transmission of EOR (end of retransmission) is required. In such a case, after transmitting the low-speed EOR in step 262, it is determined in step 264 whether the low-speed ERR has been received. If the low-speed ERR has been received, the process proceeds to step 242. If the low-speed ERR has not been received, it is determined in step 266 whether or not a low-speed PIN (procedure interruption denial signal) has been received. Performs the line hold processing in step 268, and then proceeds to step 242.

Next, the reception protocol will be described with reference to FIGS. If it is determined in step 270 in FIG. 7 that there is an incoming call, a 1.8-second timer is started in step 272, and an FPT signal (indicating the transmission speed of the high-speed NSS indicating a transition to the short protocol mode) is issued in step 274. If it is determined that the signal has been received, the mode shifts to the shortened protocol mode (transition case 1 at the time of reception), the reception phase B (FIG. 8) at step 276, the reception phase C (FIG. 9) at step 278, and the reception at step 280. Execute phase D (FIG. 10). If it is determined in step 282 that the process proceeds to the receiving phase C, the process returns to step 278 to execute the receiving phase C. If it is determined in step 284 that the process proceeds to the receiving phase B, the process returns to step 276 to execute the receiving phase B. I do. Then, after executing the reception phases B, C, D, and E, the low-speed D
Upon receiving the CN (disconnection command signal), the reception ends.

If it is determined in step 274 that the FPT signal instructing the shift to the shortened protocol mode has not been received, it is determined in step 288 whether CNG has been received. If CNG is not received, step 27 is executed until it is determined in step 290 that a timeout has occurred.
4. The judgment of 288 is repeated.

When CNG is received and when a timeout occurs, a CED is transmitted in step 292,
At step 294, it is determined whether or not an FPT signal instructing a shift to the shortened protocol mode has been received. When the FPT signal instructing the shift to the shortened protocol mode is received, the transmission of the CED is stopped in step 296, and then the shift is made to the shortened protocol mode (transition case 2 at the time of reception). If the FPT signal instructing the transition to the mode has not been received, it is determined in step 298 whether or not CED transmission has ended. CED
If the transmission is not completed, the flow returns to step 292 to return to CED
If the transmission of CED is completed, step 3
After transmitting the NSF / DIS at 00, it is determined at step 302 whether or not an FPT signal instructing the transition to the shortened protocol mode has been received. When the FPT signal instructing the shift to the shortened protocol mode is received, the mode is shifted to the shortened protocol mode (shift case 3 at the time of reception), and the process proceeds to step 276 to receive the FPT signal instructing the shift to the shortened protocol mode. If not, step 3
At 04, the mode shifts to the normal reception mode.

The reception phase B will be described with reference to FIG. If it is determined in step 310 that a high-speed NSS command of the transmission rate indicated by the FPT signal received from the transmitter has been received, high-speed NSF is transmitted in step 312, and the process proceeds to the image information receiving phase C.

If the high-speed NSS is not received, it is determined in step 314 whether or not the high-speed NSC has been received. If not, the process returns to step 310. If the high-speed NSC is received, it is determined in step 316 whether or not the line hold is performed. And
If it is not line hold, error end processing is performed in step 320, and if it is line hold, step 318 is executed.
Executes the transmission phase B of FIG.

The reception phase C will be described with reference to FIG. In the receiving phase C, the image information which is divided into ECM frames and transmitted is received. In the frame configuration, as described in the case of transmission, in the first frame (frame No. 0), parameters indicating image information transmitted subsequently are set, and image information is transmitted after the second frame. Is set. The procedure at the start of the reception phase C particularly related to the present invention will be described later in detail.

In step 322, it is determined whether or not an FCD (facsimile coded data) frame has been received. M. If the RCP frame in which the content corresponding to the CCP is set is received, in step 324, the RCP P.C. M. The contents of C are analyzed, and the process proceeds to phase D for transmitting a response command.

If an FCD frame has been received, the frame No. 0 (first frame), that is, whether or not NSS information has been received. If it has been received, the NSS information is analyzed in step 328 and the frame No. 0 is not received, that is, the frame No. When the first and subsequent frames (second and subsequent frames) are received, the received image information is stored in the RAM 2,
In step 332, it is determined whether or not the frame reception has been completed.
If the frame reception has been completed, the process proceeds to phase D. If the frame reception has not been completed, the above procedure is repeated.

Next, based on FIG.
Will be described. It is determined in step 340 whether an RCP frame has been received. If no RCP frame has been received, the process waits until it is determined in step 342 that a low-speed command has been received. In step 344, the reception state of the FCD frame is checked. If the reception is good, it is determined in step 346 whether or not line hold is to be performed.
At 48, the line hold procedure is executed. If the line hold is not performed, the low speed MCF is transmitted at step 350, and the process proceeds to step 352.

In step 352, the P.C. set in the received RCP frame is set. M. Based on C, it is determined whether the next procedure is the receiving phase C, B, or E. Based on the determination result, the process proceeds to the receiving phase C in step 354, and proceeds to the receiving phase B in step 356. At 358, the process proceeds to the reception phase E.

If it is determined in step 344 that the reception state of the FCD frame is not good, low-speed PPR is transmitted in step 360, and it is determined in step 362 whether CTC has been received. If the CTC has been received, the low-speed CTR is transmitted in step 364, and then in step 36
At 6, the process proceeds to the receiving phase C.

If the CTC has not been received, it is determined in step 368 whether or not the EOR has been received. If the EOR has not been received, the process proceeds to the receiving phase C in step 370. It is determined whether or not a hold is performed.
4 to execute the line hold procedure. If the line hold is not performed, the low speed ERR is transmitted in step 376.
Proceed to step 352.

FIG. 11 shows a signal sequence in the cases (1) to (3) for shifting to the short protocol mode at the time of transmission and reception.
13 to FIG. 11 to 13, the RCP frame (PPS / MPS) indicates that the PPS / MPS of the post message command is set in the RCP frame, and the RCP frame (PPS / EOP) indicates the PPS of the post message command in the RCP frame. -Indicates that EOP is set, and FCD frame (PIX) is FCD
This indicates that the image information PIX is set in the frame, and the common operation is performed after the transition to the short protocol mode.

Next, a procedure at the start of the reception phase C (see FIG. 9) particularly related to the present invention will be described with reference to FIG.

When the reception phase C is started, it is determined in step 400 of FIG. 14 whether or not an EPT signal has been received.
To FP to determine whether the FPT signal has been received.
If the T signal has not been received, the process returns to step 400. That is, steps 400 and 402 are repeated until either the EPT signal or the FPT signal is received.

Here, when the FPT signal is received (ie,
If the answer is YES in step 402), the process proceeds to the receiving phase B (see FIG. 8) in step 404, and if the EPT signal is received (that is, if the answer in step 400 is affirmative), the EPT signal It is determined whether or not the training is successful based on whether or not the subsequently transmitted training signal is normally received. If the training is not successful, step 406 is repeatedly performed until the training is successful. The process proceeds to step 322 in phase C (see FIG. 9).

The above steps 400 and 4
02 corresponds to the detecting means of the present invention, and step 406 corresponds to the determining means of the present invention.

As described in detail above, in the facsimile apparatus according to the present embodiment, prior to receiving image information,
When the reception of the EPT signal and the FPT signal is detected and the reception of the EPT signal is completed, the detection of the reception of the FPT signal ends and the training signal is received, so that the training signal is not erroneously recognized as the FPT signal. .

[0063]

As described above, according to the first and second aspects of the present invention, when the echo protect tone signal is detected, the signal for instructing the shift to the shortened protocol is not detected. Since the detection of the training signal is performed at the same time, there is an effect that the training signal is not erroneously recognized as the signal instructing the shift to the shortened protocol.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a control routine of a transmission protocol.

FIG. 3 is a flowchart showing a control routine of a transmission phase A;

FIG. 4 is a flowchart showing a control routine of a transmission phase B;

FIG. 5 is a flowchart showing a control routine of a transmission phase C;

FIG. 6 is a flowchart showing a control routine of a transmission phase D;

FIG. 7 is a flowchart showing a control routine of a reception protocol.

FIG. 8 is a flowchart showing a control routine of a reception phase B;

FIG. 9 is a flowchart showing a control routine of a reception phase C;

FIG. 10 is a flowchart showing a control routine of a reception phase D;

FIG. 11 is a diagram showing a signal sequence of a shortened protocol procedure in a shortened protocol mode transition case 1 during transmission and reception.

FIG. 12 is a diagram showing a signal sequence of a shortened protocol procedure in a shortened protocol mode transition case 2 during transmission and reception.

FIG. 13 is a diagram showing a signal sequence of a shortened protocol procedure in a shortened protocol mode transition case 3 during transmission and reception.

FIG. 14 is a flowchart showing a control routine at the start of a reception phase C;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU 2 RAM 3 Operation display device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takashi Sakayama, Inventor 3-7-1, Fuuchi, Iwatsuki-shi, Saitama Fuji Xerox Co., Ltd. Iwatsuki Office (72) Inventor, Masahiro Mochizuki 3-7-1, Fuuchi, Iwatsuki-shi, Saitama No. Fuji Xerox Co., Ltd. Iwatsuki Office

Claims (2)

[Claims] Communication means having a function of executing a shortened protocol procedure; and detecting means for detecting both a signal for instructing a shift to the shortened protocol and an echo protect tone signal before receiving image information. A facsimile apparatus comprising: a determination unit configured to detect a training signal and determine whether training is successful when an echo protection tone signal is detected by the detection unit. 2. When executing a shortened protocol procedure, a signal for instructing a shift to the shortened protocol and an echo protect tone signal are both detected before receiving image information, and the echo protect tone signal is detected. If detected,
A facsimile communication method in which a training signal is detected to determine whether training is successful.