JPH09200288A - Transmission control procedure control system for pictorial communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission control procedure control system with which a transmission control procedure can be executed while shortening it as much as possible when opposite side equipment has ability for executing the abbreviated trans mission control procedure and communication can be executed at high speed as much as possible while using a standard transmission control procedure when the abbreviated transmission control procedure can not be executed by the state of a line, etc. SOLUTION: When a low-speed non-standard function identification signal(NSF) is received from the opposite side equipment, this low-speed non-standard function identification signal is counted and before this count value of low-speed non-standard function identification signals reaches the prescribed number of times set in advance, move to the abbreviated transmission control procedure is tried but when the count value of low-speed non-standard function identification signals reaches the prescribed number of times set in advance, the standard transmission control procedure is started. Besides, when no response is received from the opposite side equipment even after communication rate falls back to prescribed communication rate set in advance, the communication rate is reset to the communication rate of the standard transmission control procedure, and the transmission control procedure is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission control procedure control system in an image communication apparatus such as a facsimile apparatus capable of executing a predetermined shortened transmission control procedure in addition to a standard transmission control procedure line, and particularly to a shortened transmission control procedure. If the low-speed non-standard function identification signal is received from the partner device a predetermined number of times, or if the response from the partner device is not received even if the communication speed falls back to the preset predetermined communication speed, the standard transmission control procedure is used. The present invention relates to a transmission control procedure control method in an image communication apparatus configured to shift.

[0002]

2. Description of the Related Art Conventionally, in image communication apparatuses such as facsimile machines, image communication apparatuses adopting a transmission control procedure for omitting or shortening a fallback procedure for determining the transmission rate of image information, which requires a great deal of time, have been available. Proposed.

For example, in the image communication apparatus disclosed in Japanese Patent Application Laid-Open No. 1-264065, the NSS
(Non-standard function setting signal) is sent as a high-speed signal, and in response to this, when a low-speed CFR (reception preparation confirmation signal) is received from the receiving side, an image is sent, and if the receiving side cannot receive this high-speed NSS, T. The standard transmission control procedure defined by 30 is used for communication.

Further, in the image communication apparatus disclosed in Japanese Patent Laid-Open No. 3-154566, when the polarity reversal of the line is detected, an NSS (non-standard function setting signal) of 300 bps is detected.
When a CED (callee identification signal) is detected without detecting the polarity reversal of the line, a tone is sent to stop the CED and an NSS of 300 bps is sent. In this configuration, since the NSF (non-standard function setting signal) is omitted, the FIF (facsimile information field) of the NSF of the partner machine is stored at the time of the first communication, and the stored contents and negotiation are negotiated. And communication parameters are determined. For the transmission rate of image information, the transmission side stores the transmission rate history,
Image information is transmitted at the transmission speed.

Further, in the image communication apparatus disclosed in Japanese Patent Laid-Open No. 5-219334, when the CED (Called Terminal Identification Signal) is detected, the calling side has its own tone (DTM).
F) is sent to stop the CED, and 300 bps NSF for the shortening protocol (NSF without essential capabilities) is sent. Here, the unique tone also has a function of notifying the transmission rate of image information. Therefore, the parameter of the image information is transmitted at high speed before the image information with this unique tone, and then the image information is transmitted.

[0006]

However, all of the above-mentioned conventional apparatuses unconditionally perform T.S.T. when the shortened transmission control procedure (shortened protocol) cannot be executed. Since it is configured to shift to the standard transmission control procedure defined by 30, there is a problem that the probability of executing the shortened transmission control procedure becomes low.

After shifting to the shortened transmission control procedure,
If the high speed signal cannot be received, the T. Since there is no procedure to return to the standard transmission control procedure defined by 30, there is a problem that communication must be interrupted in this case.

Therefore, the present invention enables the shortened transmission control procedure to be executed as much as possible when the partner device has the ability to execute the shortened transmission control procedure, and shortens the transmission according to the state of the line or the like. It is an object of the present invention to provide a transmission control procedure control method in an image communication apparatus that enables communication at the highest speed possible by using a standard transmission control procedure when the control procedure cannot be executed.

[0009]

In order to achieve the above-mentioned object, the invention according to claim 1 is a shift for instructing a partner device to shift from a standard transmission control procedure to a predetermined shortened transmission control procedure. When a high-speed non-standard function setting signal for setting a non-standard function is sent to the partner device after sending an instruction signal, and a high-speed non-standard function identification signal from the partner device is received in response to this. In a transmission control procedure control method in an image communication apparatus that executes a predetermined shortened transmission control procedure, when a low speed non-standard function identification signal is received from the partner device, this low speed non-standard function identification signal is counted and this low speed non-standard function identification signal is counted. Until the count value of the standard function identification signal reaches a preset number of times, the transition instruction signal and the high-speed non-standard function setting signal are retransmitted to the partner device so that the shortened transmission control procedure is performed. Attempts rows, if the count value of the low-speed non-standard facilities signal reaches a predetermined number of times set in advance is characterized by migrating to the standard transmission control procedure.

According to such a configuration, when the partner machine has the ability to execute the shortened transmission control procedure, it is controlled so that the shortened transmission control procedure can be executed as much as possible. It is possible to increase the probability of executing.

Further, the invention of claim 2 is a high-speed method for setting a non-standard function after transmitting a signal instructing the other device to shift from the standard transmission control procedure to a predetermined shortened transmission control procedure. When a non-standard function setting signal is sent to the partner device and no response is received from the partner device, communication speed fallback is performed to retransmit the transition instruction signal and the high-speed non-standard function setting signal. In the transmission control procedure control method in the image communication apparatus, which executes the predetermined shortened transmission control procedure when the high-speed non-standard function identification signal is received from the partner device, the communication speed falls to a preset predetermined communication speed. If the response from the partner device is not received even after the back, the standard transmission control procedure is followed.

The invention of claim 3 is characterized in that, in the invention of claim 2, when the standard transmission control procedure is entered, the communication rate is reset to the communication rate of the standard transmission control procedure. To do.

With this configuration, even if the communication speed falls below the communication speed of the standard transmission control procedure due to the fallback of the communication speed, it is possible to shift to the standard transmission control procedure. Communication can be performed, which enables communication as fast as possible while using the standard transmission control procedure.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a transmission control procedure control system in a communication device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a facsimile apparatus constructed by applying a transmission control procedure control system in an image communication apparatus according to the present invention. This facsimile machine is an ISDN (Integrated Services Digital Network)
A central processing unit (CPU) 31 for controlling the entire facsimile apparatus, which is configured to be switchably connected to both a digital network such as the above and an analog public network.
A RAM (random access memory) 32 constituting a work area used by the control program of the CPU 31 and an operation display device 3 for operating the facsimile device 3.
3, a reading device 34 for reading a transmission original, a printing device 35 for recording a received image and the like, an image processing device 36 for encoding, decoding, enlarging and reducing an image signal, an image storage device 37 for storing image information, A system control unit 38 having a ROM (Read Only Memory) storing a control program for controlling the entire facsimile apparatus, and a ROM storing a program for controlling a communication suitable for a digital network, for example, a G4 facsimile. Communication control unit 3
9. Control communication suitable for analog network, eg G3
A communication control unit 40 having a ROM storing a program for a facsimile, a modem 41 which is a modulator / demodulator having a low speed mode and a high speed mode, and a line switching control for connecting a plurality of external line interfaces and a plurality of internal communication lines. A device 42, a digital network control device 43 for connecting to the digital network 21, and an analog network control device 4 for connecting to the analog network 22 having an automatic call originating / receiving function.
4. The system includes a system bus 45 for exchanging data between the functional blocks.

Here, when the facsimile machine is connected to the analog network 22, the communication control unit 34 and the digital network control device 43 can be omitted, and when the facsimile machine is connected to the digital network 21, the communication control is performed. It is possible to omit the section 40, the modem 41 and the analog network controller 44.

In the configuration shown in FIG. 1, 1) when a low speed non-standard function identification signal is received from a partner machine, the low speed non-standard function identification signal is counted and the low speed non-standard function identification signal is counted. Until the number reaches a preset number of times, the transfer instruction signal and the high-speed non-standard function setting signal are retransmitted to the partner device to attempt the transfer to the shortened transmission control procedure, and the count value of the low-speed non-standard function identification signal is A configuration that shifts to the standard transmission control procedure when the preset number of times is reached 2) If the response from the partner device is not received even if the communication speed falls back to the preset predetermined communication speed, the standard Configuration for shifting to the transmission control procedure 3) When shifting to the standard transmission control procedure in the configuration of 2), the system control unit is configured to reset the communication speed to the communication speed of the standard transmission control procedure. Controlled by 38.

Next, the transmission operation of the facsimile apparatus of this embodiment will be described with reference to the transmission protocol control flowcharts shown in FIGS.

FIG. 2 is a control flow chart showing the transmission protocol of the facsimile apparatus of this embodiment.

First, when a call is made to the partner device (step 101), it is checked whether or not the partner device has the capability of receiving the shortened protocol (step 102). Here, whether or not the partner device has the shortened protocol reception capability is stored in advance in the destination data list stored in a predetermined storage area of the RAM 32 shown in FIG. Has been done.

That is, in step 102, the destination data list of the RAM 32 is searched based on the shortened number of the calling party to check whether or not the called party has the shortened protocol receiving capability.

If it is stored that the partner machine has the capability of receiving the shortened protocol (YES in step 103).
S), the transmission phase A is executed (step 112).
Details of this transmission phase A will be described later with reference to FIG.

When the transmission phase A is completed, it is judged whether or not the transmission to the shortened protocol (short professional) transmission is started in this transmission phase A (step 113). YE at 113
S), then execute the transmission phase B (step 11)
4). Details of this transmission phase B will be described later with reference to FIG.

Upon completion of the transmission phase B, it is judged whether or not the transmission to the shortened protocol (short professional) transmission has been performed in this transmission phase B (step 115). YE at 115
S), then execute the transmission phase C (step 11)
6). Details of the transmission phase C will be described later with reference to FIG.

When the transmission phase C is completed, the transmission phase D is then executed (step 117). Details of the transmission phase D will be described later with reference to FIG.

When the transmission phase D is completed, it is checked in this transmission phase D whether to shift to the transmission phase C (step 118). Here, in the case of shifting to the transmission phase C (YES in step 118), step 11
Returning to step 6, if it is determined that the transmission phase C is not to be transitioned to (NO in step 118), then it is checked in the transmission phase D whether to transit to the transmission phase B (step 11).
9). Here, if the process shifts to the transmission phase B (YES in step 119), the process returns to step 114, and if the process does not shift to the transmission phase B (N in step 119).
O), low-speed DCN (disconnect command signal) is transmitted, and this transmission protocol is terminated.

If it is determined in step 103 that the partner device does not have the capability of receiving the shortened protocol, first, a CNG (calling tone) of 1100 Hz is transmitted (step 104), and then the partner device performs CED (calling tone). It is checked whether the called terminal identification signal) or any command has been received (step 105). If the CED or any command has not been received (NO in step 105), the process returns to step 104, and CNG is set again. When sending out and receiving CED or some command (step 1
(YES in 05), next, it is checked whether an NSF (non-standard function identification signal) is received from the partner machine (step 106), and NS
If F is received (YES in step 106),
It is checked whether the received NSF is the company's NSF (step 108), and if it is the company's NSF, this company's NSF
It is checked whether F includes information indicating that the shortened protocol transmission capability is included (step 108). If information indicating that the shortened protocol transmission capability is included is included in the F (step 1).
(YES in 08), and stores the shortened protocol receiving capability in the destination data list of the RAM 32 shown in FIG. 1 corresponding to the shortened number of the partner machine (step 109),
Proceeding to step 114, the transmission phase B is executed.

If it is determined in step 106 that NSF is not received, that is, if DIS (digital identification signal) is received (NO in step 106),
When it is determined that the NSF received in step 107 is not the company's NSF (NO in step 107), or in the case of step 108, it is determined that the company's NSF does not include information indicating that the shortened protocol transmission capability is available ( If NO in step 108), it is stored in the destination data list of the RAM 32 shown in FIG. 2 that there is no shortened protocol receiving capability corresponding to the shortened number of the partner machine (step 110),
Normal transmission (communication according to the standard transmission control procedure defined in T.30) is performed (step 111), and this transmission protocol ends.

If it is determined in step 113 that the transmission to the shortened protocol transmission has not been started in the transmission phase A (NO in step 113), or step 11
When it is determined in 5 that the transmission to the shortened protocol transmission has not been performed in the transmission phase B (NO in step 115)
Judges that it is normal transmission and proceeds to step 106 to check whether NSF is received from the partner device.

FIG. 3 shows details of the processing in the transmission phase A of step 112 shown in FIG.
In this transmission phase A, first, it is checked whether or not the partner machine has a polarity reversal detection function (step 1
21). Here, whether or not the partner machine is equipped with the polarity reversal detection function is stored in advance in the destination data list of the RAM 32 shown in FIG. 1 in correspondence with, for example, the shortened number of the partner machine.

That is, at step 121, the destination data list of the RAM 32 is searched based on the abbreviated number of the calling partner device to check whether the partner device has the polarity reversal detection function.

If the partner machine has the polarity reversal detection function (YES in step 121), CNG
A (calling tone) transmission start timer is started (step 127), and then it is checked whether polarity reversal is detected (step 127). Here, as will be described later in detail, the polarity reversal detection is determined by whether or not the number of polarity reversals has reached the number of polarity determinations learned during the previous communication with this partner device. When the number of polarity determinations learned during the previous communication with the device has been reached (YES in step 127), the process proceeds to shortened protocol (short professional) transmission (step 133).

If no polarity reversal is detected in step 127, that is, if the number of polarity reversals has not reached the number of polarity determinations learned during the previous communication with this partner device (NO in step 127), Is checked to see if the CNG sending start timer has timed out (step 128). If the CNG sending start timer has not timed out (NO in step 128), step 12
Returning to step 7, if the CNG transmission start timer has timed out (YES in step 128), CNG (calling tone) is transmitted (step 129) and it is checked again whether polarity reversal is detected (step 130).

If polarity reversal is detected here (YES in step 130), the process shifts to shortened protocol (short professional) transmission (step 133).

If polarity reversal is not detected in step 130 (NO in step 130), then CED
It is checked whether (the called terminal identification signal) is received (step 1
31), if CED is received (Y in step 131)
ES), and shortened protocol (short professional) transmission (step 133).

If it is determined in step 131 that the CED is not received (NO in step 131),
Check whether a low speed command has been received (step 132),
If the low speed command is not received (step 132)
If NO in step 132, the process returns to step 129, CNG (calling tone) is transmitted again, and if it is determined that the low speed command is received (YES in step 132), the process shifts to normal transmission (step 125).

If it is determined in step 121 that the other device does not have the polarity reversal detection function (NO in step 121), CNG (calling tone) is transmitted (step 122), and then CED (received). Call terminal identification signal)
Is received (step 123), and if CED is received (YES in step 123), the process shifts to shortened protocol (short professional) transmission (step 133).

If it is determined in step 123 that the CED is not received (NO in step 123),
Check whether a low speed command has been received (step 124),
If the low speed command is not received (step 124)
If NO in step 122, the process returns to step 122, CNG (calling tone) is sent again, and if it is determined that the low speed command has been received (YES in step 124), the process shifts to normal transmission (step 125).

FIG. 4 shows details of the processing in the transmission phase B of step 114 shown in FIG.
In this transmission phase B, first, a signal for instructing the shift to the shortened protocol is transmitted (step 141),
Then, a high speed NSS (non-standard function setting signal) is sent (step 142). Then, it is checked whether a response has been received from the partner machine (step 143).

If a response is received from the partner device (YES in step 143), then the high speed NSF is performed.
It is checked whether (non-standard function identification signal) is received (step 144), and if a high-speed NSF is received (step 14).
(YES in step 4), the shortened protocol (short professional) transmission is executed (step 145).

When the high speed NSF is not received in step 144 (NO in step 144), the low speed NSF is not received.
SF is received (step 146) and then this slow NSF is received.
It is checked whether the number of times of reception has reached a preset N times (step 147). If the number of low-speed NSF receptions has not reached N (NO in step 147),
Returning to step 141, the signal instructing the shift to the shortened protocol is sent (step 141) and the high speed NSS (non-standard function setting signal) is sent (step 142).

When it is judged in step 147 that the number of low-speed NSF receptions has reached N times (YE in step 147).
S), T. The communication is shifted to the standard transmission control procedure defined by 30, and normal transmission is executed (step 148).

When the response from the partner machine is not received in step 143 (N in step 143).
O), it is checked whether polarity reversal is detected (step 14).
9).

If the polarity reversal is not detected (NO in step 149), the fallback parameter is set (step 150), and then the communication speed according to the fallback parameter is set to a predetermined communication speed set in advance. It is checked whether the communication speed is V1 or lower (step 151), and if the communication speed is not V1 or lower (N in step 151).
O), the process returns to step 141, and a signal transmission for instructing the transition to the shortened protocol again (step 141), high-speed NS
S (non-standard function identification signal) is transmitted (step 142).

In this way, when it is determined in step 151 that the communication speed has become equal to or lower than the preset predetermined communication speed V1 (YES in step 151), the communication speed is reduced from the protocol to the normal procedure. The communication speed (set value V2) of the normal means for backing is set again (step 152), and normal transmission is executed (step 148).

If polarity reversal is detected in step 147 (YES in step 149), the communication speed of the initial value is reset (step 153), and step 14
Returning to 1, the signal transmission for instructing the shift to the shortened protocol (step 141) and the high speed NSS (non-standard function identification signal) are transmitted again (step 142).

That is, when the partner device has the polarity reversal detection function, the polarity reversal is detected even while waiting for the response from the partner device, and when the polarity reversal is detected, the communication of the initial value is performed. Perform the process to reset the speed.

FIG. 5 shows the details of the processing in the transmission phase C of step 116 shown in FIG.
In this transmission phase C, first, it is checked whether or not the image information is retransmitted (step 161), and if it is determined that the image information is not retransmitted (NO in step 161), NSS ( Non-standard function setting signal)
Is transmitted (step 162), the image information is transmitted in a frame (step 163), and it is checked whether the transmission of this image information is completed (step 164). If not completed, (NO in step 164), the process returns to step 163, and when the process is completed (Y in step 164)
The contents of the post message command are sent in the ES) and RCP (partial page control return) frames and transmitted (step 165), and then the process returns.

If the image information is retransmitted in step 161 (YES in step 161), the image information to be retransmitted is sent in a frame (step 166), and then the retransmission of this image information is completed. Check if (step 16
7) If not completed (N in step 167)
O), the procedure returns to step 166, and when the processing is completed (YES in step 167), the contents of the post message command are sent in the RCP (partial page control return signal) frame (step 165), and then the procedure returns.

FIG. 6 shows details of the processing in the transmission phase D of step 117 shown in FIG.
In this transmission phase D, first, it is checked whether a response from the partner device has been received (step 171), and if no response has been received (N in step 171).
O), PPS-Q or PPS-PriQ, a low speed post message command is transmitted, and the process returns to step 171.

When the response from the partner machine is received in step 171 (YES in step 171), it is checked whether or not the low speed MCF (message confirmation signal) is received (step 173). If the low speed MCF is received, (YES in step 173), and the process proceeds to step 186.

If it is determined in step 173 that the low speed MCF is not received (step 173 returns N
O), and then it is checked whether a low speed PPR (partial page request signal) has been received (step 174).
Is received (YES in step 174), the CTC
It is checked whether (correction continuation signal) needs to be transmitted (step 17
7) If necessary (YES in step 177), the low-speed CTC is transmitted (step 178), and the low-speed CTR (correction continuation response signal) is received (step 179: YE).
S) and shift to the transmission phase C (step 187).

If it is determined in step 177 that the CTC (correction continuation signal) need not be sent (NO in step 177), it is then checked whether EOR (retransmission end signal) needs to be sent (step 180), if necessary (YES in step 180), the low speed EOR is transmitted (step 181), and when the low speed ERR (retransmission end response signal) is received (YES in step 182), step 186
Proceed to.

If it is determined in step 182 that the low speed ERR (retransmission end response signal) is not received, it is next checked whether or not the low speed PIN (procedure interruption negative signal) is received (step 183), and the low speed PIN is received. Then (Step 1
If YES in 83), the line hold procedure is performed (step 184), and the process proceeds to step 186.

If the low speed PPR is not received in step 174 (NO in step 174), the next low speed PPR
It is checked whether an IP (procedure interruption acknowledge signal) is received (step 175), and if a low speed PIP is received (step 1)
If YES at 75), the line hold procedure is performed (step 185), and the process proceeds to step 186.

When the low speed PIP is not received in step 175 (NO in step 175), a predetermined error process is performed (step 176), and the process proceeds to step 186.

At step 186, it is judged from the sent post message command whether the next procedure is the transmission phase C, the transmission phase D or the transmission phase E. Then, if it is determined that the next procedure is the transmission phase C, the process proceeds to the transmission phase C (step 189), and if it is determined to be the transmission phase D, the process proceeds to the transmission phase D (step 190). When it is determined that the transmission phase E is set, the process shifts to the transmission phase E (step 1
91).

Next, the receiving operation of the facsimile apparatus of this embodiment will be described with reference to the receiving protocol control flow charts shown in FIGS.

FIG. 7 is a control flowchart showing the reception protocol of the facsimile apparatus of this embodiment.

When there is an incoming call from the partner machine (step 20)
1) Start the 1.8 second timer (Step 2
02), it is checked whether or not a signal instructing the shift to the shortened protocol has been received (step 203).

If a signal is received (YES in step 203), it is checked if the training is OK (step 204). If the training is OK (step 20).
4) YES) The reception phase C is executed. Details of the reception phase C will be described later with reference to FIG.

When the reception phase C is completed, next, the reception phase D is executed. Details of the reception phase D will be described later with reference to FIG.

When the reception phase D is completed, it is checked in this reception phase D whether or not the transition to the reception phase C is made (step 208). Here, in the case of transition to the reception phase C (YES in step 208), step 206
Returning to, if the transition to the reception phase C is not made (NO in step 208), next, in the reception phase D, it is checked whether or not the transition to the reception phase B is made (step 209), and if the transition to the reception phase B is made ( YE in step 209
S) Then, the process proceeds to step 220, and when it is not the transition to the reception phase B (NO in step 209), it is the transition to the reception phase E, so that the low-speed DCN (disconnection command signal) is received (step 210). Terminate the reception protocol.

If it is not determined in step 203 that the signal is not the signal instructing the shift to the shortened protocol (NO in step 203), it is checked whether or not CNG (calling tone) is received (step 211).
If not G reception (NO in step 211), 1.8
Check if the seconds timer has timed out (step 21
2) If there is no timeout (N in step 212)
O), the process returns to step 203, and if the time is out (YES in step 212), CED (callee terminal identification signal) is transmitted (step 213).

If it is determined in step 211 that CNG has been received, the process proceeds to step 213, and CED (callee terminal identification signal) is transmitted.

When CED is transmitted in step 213, it is checked again whether or not a signal for instructing the shift to the shortened protocol is received (step 214). Here, when it is determined that the signal for instructing the shift to the shortened protocol is received (step 2
If YES in step 14, the CED transmission is stopped (step 21).
5), go to step 204.

If it is determined in step 214 that the signal is not received to instruct the shift to the shortened protocol,
Next, it is checked whether the CED transmission is completed (step 216), and the CE
If the D transmission has not ended (NO in step 216), the process returns to step 213. If it is determined that the CED transmission has ended (YES in step 216), low-speed NSF transmission is performed (step 217), and further shortening protocol is set. It is checked whether or not the signal instructing the shift is received (step 218). Here, if it is determined that the signal reception is an instruction to shift to the shortened protocol (YES in step 218), then it is checked whether the high speed NSS is received (step 220), and the high speed NS
If it is S reception (YES in step 220), the process proceeds to step 204. If it is not high-speed NSS reception (NO in step 220), normal reception is performed (step 22).
1) The receiving protocol is ended.

If it is determined in step 218 that the signal for instructing the shift to the shortened protocol has not been received (NO in step 218), it is next checked whether or not it has timed out (step 219), and if it has not timed out (step 219). If NO in step 218, the process returns to step 218, but if the time is out (YES in step 219), the communication is interrupted.

FIG. 8 shows the details of the processing in the reception phase C of step 206 shown in FIG.
In the reception phase C, it is first checked whether or not an FCD (facsimile coded data) frame is received (step 231), and if it is an FCD frame reception (step 23).
(YES in 1), it is checked whether the NSS (non-standard function setting signal) information of the frame of frame number 0 is received (step 2).
32). If the NSS information is received (YES in step 232), the NSS is analyzed (step 235) and the process returns to step 231.

If the NSS information is not received in step 232 (NO in step 232), the received image information is accumulated (step 233), and it is checked whether the frame reception is completed (step 234). Here, if the frame reception is not completed (NO in step 234), the process returns to step 231, and if the frame reception is completed (YES in step 234), the process returns.

If it is determined in step 231 that the FCD frame is not received (step 231 returns N
O), since it is the reception of the RCP frame, the content of the post message command of this RCP frame is analyzed (step 236), and then the process returns.

FIG. 9 shows details of the processing in the reception phase D of step 207 shown in FIG.
In the reception phase D, it is first checked whether an RCP (partial page control return signal) frame is received (step 241). Here, if the RCP frame is received (YES in step 241), step 243
Proceed to. If it is determined in step 241 that no RCP frame is received (N in step 241).
Next, it is checked whether or not the low speed command is received (step 242), and when the low speed command is received (step 2).
If YES at 42), the process proceeds to step 243.

In step 243, it is checked whether the FCD (facsimile coded data) frame is OK. If the FCD frame is OK (YES in step 243), it is then checked whether it is line hold (step 244). If there is (YES in step 244), the line hold procedure is executed (step 246), and step 25
Proceed to 6.

If it is determined in step 244 that the line hold is not set (NO in step 244), a low speed MCF (message confirmation signal) is transmitted (step 24).
5), go to step 256.

When it is determined in step 243 that the FCD frame is not OK (N in step 243).
O), the low-speed PPR (partial page request signal) is transmitted (step 247), and it is checked whether the CTC (correction continue signal) has been received (step 248). If the CTC is received here (YES in step 248), A low-speed CTR (correction continuation response) is transmitted (step 249), and the phase shifts to the reception phase C (step 250).

If CTC is not received in step 248 (NO in step 248), it is checked whether EOR (retransmission end signal) is received next (step 251). If EOR is not received here. (N in step 251
O), and shifts to the reception phase C (step 252).

If it is determined in step 251 that the EOR is received (YES in step 251),
Next, it is checked whether it is line hold (step 253). If it is line hold (YES in step 253), the line hold procedure is executed (step 255), and the process proceeds to step 256.

If it is determined in step 253 that the line hold is not performed (NO in step 253), a low speed ERR (retransmission end response signal) is transmitted (step 25).
4) and proceed to step 256.

At step 256, it is judged from the received post message command whether the next procedure is the receiving phase C, the receiving phase D or the receiving phase E (step 256). Then, if it is determined that the next procedure is the receiving phase C, the process proceeds to the receiving phase C (step 257), and if it is determined to be the receiving phase D, the process proceeds to the receiving phase D (step 258). If it is determined that the phase is the reception phase E, the phase shifts to the reception phase E (step 259).

Next, a basic transmission / reception protocol procedure of this facsimile apparatus realized by the control flowcharts shown in FIGS. 2 to 9 will be described with reference to sequence charts shown in FIGS. 10 to 12. Here, FIGS. 10 to 12 show basic transmission / reception protocol procedures in three cases of mode transition to the shortened protocol.

FIG. 10 shows a first case of mode transition to the shortened protocol. In the first case, the transmitting side first makes a call, and the storing means of the transmitting side. It is checked whether (with the destination data list of the RAM 32 in FIG. 1) is stored as having the shortened protocol receiving capability corresponding to the shortened number of the partner device (receiving side) (step 103 in FIG. 2), the shortened protocol receiving capability is available. If it is stored, then it is checked whether the partner device (reception side) is actually measuring the polarity reversal detection function (step 121 in FIG. 3). The reversal is checked (steps 127 and 130 in FIG. 3), and when the polarity reversal is detected, a signal instructing the shift to the shortening protocol is sent (step 141 in FIG. 4). Shifts to the reduced protocol, executes the simplified protocol.

On the other hand, on the receiving side, when an incoming call is received, CED
It is checked whether or not a signal instructing the transition to the shortened protocol has been received from the transmitting side until the transmission of the (called terminal identification signal) (step 203 in FIG. 7), and a signal instructing the transition to the shortened protocol is received. Then, shift to the shortened protocol and execute the shortened protocol.

In the shortened protocol, on the transmission side, first, a signal indicating the communication speed of a high speed command (a signal instructing the shift to the shortened protocol) is followed by a high speed NSS.
(Non-standard function setting signal) is transmitted (step 14 in FIG. 4).
2) Wait for a high-speed NSF (non-standard function identification signal) from the other device (reception side), and then a high-speed NS from the other device (reception side)
When F is received (step 144 in FIG. 5), the image information transmission phase (transmission phase C in FIG. 5) is entered.

When the receiving side receives the high speed NSS having the communication speed indicated by the signal indicating the communication speed of the high speed command from the transmitting side (the signal instructing the shift to the shortened protocol) (step 220 in FIG. 7). , The high speed NSF is transmitted (step 205 in FIG. 7), and the image information reception phase (FIG. 8)
To the reception phase C).

In the image information transmitting phase (transmission phase C) on the transmitting side, the image information is divided into frames in ECM (error correction mode) and transmitted. Here, the parameters of the following image information are set in the first frame of the frame by this ECM, and the image information is inserted and transmitted in the second and subsequent frames (FCD frames). Note that the first frame may be the contents of the NSS that was previously transmitted, or only the parameter indicating the image information to be transmitted.

When the transmission of the image information is completed in this way, the RCP in which the content corresponding to the post message command is set in the facsimile information field
The frame is transmitted (step 165 in FIG. 5), and the process shifts to the respond command waiting phase (transmission phase D in FIG. 6).

In the image information receiving phase (reception phase C) on the receiving side, the image information transmitted from the transmitting side after being divided by the frame by the ECM is received. When the reception of the image information is completed, the RCP frame in which the content corresponding to the post message command is set in the facsimile information field is received, and the RC
The contents of the post message command of the P frame are analyzed (step 236 in FIG. 8), and then the process shifts to the respond command waiting phase (reception phase D in FIG. 9).

In the reply command waiting phase (transmission phase D) on the transmission side, when the MCF (message confirmation signal) is received (step 173 in FIG. 6), the contents of the post message command set in the RCP frame of the destination of transmission are changed. Whether to shift to the image information transmission frame (transmission phase C) or transmission phase B at the same time,
It is determined whether to shift to the transmission phase E (step 186 in FIG. 6), and the shift to each transmission phase is performed.

In the receiving command waiting phase (transmission phase D) of the receiving side, MCF (message confirmation signal) is transmitted (step 24 in FIG. 9).
5) Whether to shift to the image information reception frame (reception phase C), reception phase B, or reception phase E according to the contents of the post message command set in the received RCP frame After making a judgment (step 256 in FIG. 9), the process shifts to each reception phase.

Then, on the transmitting side, when the phase shifts to the transmission phase E, DCN (disconnection command signal) is transmitted (step 120 in FIG. 2), and this transmission protocol ends.

On the receiving side, when the phase shifts to the reception phase E, DCN from the transmitting side is received (step 21).
0) Terminate this reception protocol.

FIG. 13 shows a second case of mode transition to the shortened protocol. In this second case, the transmitting side first makes a call, and the storing means of the transmitting side. It is checked whether the shortened protocol receiving capability is stored in the (destination data list of the RAM 32 in FIG. 1) corresponding to the shortened number of the partner device (reception side) (step 102 in FIG. 2), and the shortened protocol receiving capability is present. If it is stored, then it is checked whether the partner device (reception side) is actually measuring the polarity reversal detection function (step 121 in FIG. 3). Check the inversion (step 127, step 130 in FIG. 3), and C before detecting the polarity inversion.
When the ED (called terminal identification signal) is detected (step 131 in FIG. 3), a signal instructing the shift to the shortened protocol is sent (step 141 in FIG. 4) to shift to the shortened protocol and execute the shortened protocol. .

When the partner (reception side) does not actually measure the polarity reversal detection function, CED detection is performed while sending CNG (calling tone) (steps 122 and 123 in FIG. 3) to detect CED. Then, a signal instructing the transition to the shortened protocol is sent (step 1 in FIG. 4).
41) Move to the shortened protocol and execute the shortened protocol.

On the other hand, on the receiving side, when an incoming call is received, CED
It is checked whether or not a signal instructing transition to the shortened protocol has been received from the transmitting side until (called terminal identification signal) transmission (step 203 in FIG. 7), and CED is transmitted without receiving the signal. If it is necessary, CED is transmitted (step 213 in FIG. 7), and while transmitting this CED, it is checked whether a signal instructing the shift to the shortened protocol is received (step 214 in FIG. 7), and the shortened protocol is set. When the signal for instructing the shift is received, the CED transmission is stopped, the shift to the shortened protocol is performed, and the shortened protocol is executed.

The processing after shifting to the shortened protocol is the same as that shown in FIG.

FIG. 14 shows a third case of the mode transition to the shortened protocol. In this third case, the transmitting side first makes a call, and the storing means of the transmitting side. It is checked whether (in the destination data list of the RAM 32 in FIG. 1) is stored with the shortened protocol receiving capability corresponding to the shortened number of the partner device (reception side) (step 102 in FIG. 3), and the shortened protocol receiving capability is not found. If it is stored, CED or command is detected while sending CNG (step 105 in FIG. 2), and when NSF (non-standard function identification signal) is received (step 106 in FIG. 2), this is received. Check whether the NSF is the NSF of its own machine (step 10 in FIG. 2).
7) In the case of NSF of its own machine, it is checked whether or not there is a shortened protocol receiving capability (step 108 in FIG. 2), and if there is a shortened protocol receiving capability, the transmitting side storage means (destination data of RAM 32 in FIG. In the list, it is stored that there is a shortened protocol receiving capability corresponding to the shortened number of the other device (reception side) (step 109 in FIG. 2), and then a signal instructing the shift to the shortened protocol is sent (FIG. 4). Step 141) of step 1) shifts to the shortened protocol and executes the shortened protocol. If the above conditions are not met, transmission is performed using a normal protocol.

On the other hand, on the receiving side, when an incoming call is received, CED
It is checked whether or not a signal instructing transition to the shortened protocol has been received from the transmitting side until (called terminal identification signal) transmission (step 203 in FIG. 7), and CED is transmitted without receiving the signal. If it is necessary, CED is transmitted (step 213 in FIG. 7), and while transmitting this CED, it is checked whether or not a signal instructing the shift to the shortened protocol is received (step 214 in FIG. 7). When the CED transmission is completed without receiving, the NSF and DIS indicating that the shortened protocol reception capability is available (and CI if necessary)
S) is transmitted (step 217 in FIG. 7), and it is further checked whether or not a signal instructing transition to the shortened protocol has been received (step 218 in FIG. 7). Perform a shortened protocol.
If the above conditions are not met, reception is performed using a normal protocol.

The processing after shifting to the shortened protocol is the same as that shown in FIG.

As described above, according to the facsimile apparatus of this embodiment, 1) While the connection is being executed by a procedure other than the transmission control procedure by the T.30, for example, the procedure by the shortened protocol, the signal of this procedure cannot be obtained on the receiving side. When the low-speed NSF of the transmission control procedure according to 30 is transmitted, the procedure of the shortened protocol can be tried until the sender receives the low-speed NSF for a predetermined number of times set in advance. Becomes higher.

2) T. If the actual communication speed becomes considerably low after the connection is made by a procedure other than the transmission control procedure by the T.30, for example, a procedure by the shortening protocol, for example, T.50. If the transmission speed becomes slower than the transmission speed in the transmission control procedure by T. It is possible to prevent the communication time from becoming long by returning to the communication speed in the transmission control procedure by 30.

3) T. The communication speed determined by a procedure other than the transmission control procedure by T.30 is T.30. Even if the communication speed is lower than the communication speed in the transmission control procedure by 30, the communication speed can be changed to a higher communication speed.

[0102]

As described above, according to the first aspect of the present invention, the transfer instruction signal for instructing the other device to transfer from the standard transmission control procedure to the predetermined shortened transmission control procedure is transmitted. After that, a high-speed non-standard function setting signal for setting the non-standard function is sent to the partner machine, and in response to this, when a high-speed non-standard function identification signal is received from the partner machine, a predetermined shortened transmission is performed. In the transmission control procedure control method in the image communication apparatus that executes the control procedure, when the low speed non-standard function identification signal is received from the partner device, the low speed non-standard function identification signal is counted, and the low speed non-standard function identification signal is counted. Until the count value of reaches a preset number of times, the transition instruction signal, the high-speed non-standard function setting signal is retransmitted to the partner device to attempt the transition to the shortened transmission control procedure, When the count value of the speed non-standard function identification signal reaches a preset number of times, it is configured to shift to the standard transmission control procedure, so that the other device has the ability to execute the shortened transmission control procedure. If so, the control is performed so that the shortened transmission control procedure can be executed as much as possible, and thus the probability of executing the shortened transmission control procedure can be increased.

According to the second aspect of the present invention, the non-standard function is set after the signal for instructing the other device to shift from the standard transmission control procedure to the predetermined shortened transmission control procedure is sent. When the high-speed non-standard function setting signal of is sent to the partner machine and the response from the partner machine is not received, the communication speed fallback is performed to change the transition instruction signal and the high-speed non-standard function set signal. In a transmission control procedure control method in an image communication device, which performs a predetermined shortened transmission control procedure when a high-speed non-standard function identification signal is received from the partner device, the communication speed is preset to a predetermined communication rate. If the response from the partner device is not received even after falling back to, it is configured to shift to the standard transmission control procedure, and according to the invention of claim 3, the invention of claim 2 When the standard transmission control procedure is entered, the communication rate is set to the communication rate of the standard transmission control procedure, so that the communication rate falls back to the standard transmission control procedure due to fallback of the communication rate. Even if it becomes slower than the communication speed, it is possible to shift to the standard transmission control procedure, and it is possible to perform communication at the communication speed of the standard transmission control procedure, so that communication can be performed as fast as possible while using the standard transmission control procedure. Has the effect that it becomes possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a facsimile apparatus configured by applying a transmission control procedure control method in an image communication apparatus according to the present invention.

FIG. 2 is a control flowchart showing a transmission protocol of the facsimile apparatus shown in FIG.

FIG. 3 is a flowchart showing details of processing in transmission phase A shown in FIG.

4 is a flowchart showing details of processing in a transmission phase B shown in FIG.

5 is a flowchart showing details of processing in a transmission phase C shown in FIG.

6 is a flowchart showing details of processing in a transmission phase D shown in FIG.

7 is a control flowchart showing a transmission protocol of the facsimile apparatus shown in FIG.

8 is a flowchart showing details of processing in a reception phase C shown in FIG.

9 is a flowchart showing details of processing in the reception phase D shown in FIG.

10 is a sequence chart showing a first case of mode transition to a shortened protocol in the facsimile apparatus shown in FIG.

11 is a sequence chart showing a second case of mode transition to a shortened protocol in the facsimile apparatus shown in FIG.

12 is a sequence chart showing a third case of mode transition to a shortened protocol in the facsimile apparatus shown in FIG.

[Explanation of symbols]

31 ... CPU (central processing unit), 32 ... RAM (random access memory), 33 ... Operation display device, 34 ...
Reading device, 35 ... Printing device, 36 ... Image processing device, 37
Image storage device 38 System control unit 39 Communication control unit 40 Communication control unit 41 Modem 42 Line switching control device 43 Digital network control device 44
Analog network controller, 45 ... System bus

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirotaka Kawabata 3-7-1 Fuchu, Iwatsuki City, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Office

Claims (3)

[Claims] 1. A high-speed non-standard function setting signal for setting a non-standard function after transmitting a transfer instruction signal for instructing a partner device to transfer from a standard transmission control procedure to a predetermined shortened transmission control procedure. To the partner device, and in response thereto, when receiving a high-speed non-standard function identification signal from the partner device, a transmission control procedure control method in an image communication device for executing a predetermined shortened transmission control procedure, When a low-speed non-standard function identification signal is received from the other device, the low-speed non-standard function identification signal is counted, and the transition instruction is given until the count value of the low-speed non-standard function identification signal reaches a preset number of times. Signal, the high-speed non-standard function setting signal is retransmitted to the partner device to try to shift to the shortened transmission control procedure, and the count value of the low-speed non-standard function identification signal is set to a predetermined value. Transmission control procedure control method when it reaches the number of the image communication apparatus, characterized in that the process proceeds to the normal transmission control procedure. 2. A high-speed non-standard function setting signal for setting a non-standard function is sent after transmitting a signal instructing the other device to shift from the standard transmission control procedure to a predetermined shortened transmission control procedure. When sending to the partner device and not receiving a response from the partner device, communication speed fallback is performed to retransmit the transition instruction signal and the high-speed non-standard function setting signal, and the In a transmission control procedure control method in an image communication apparatus, which executes a predetermined shortened transmission control procedure when receiving a high-speed non-standard function identification signal, in the other device even if the communication speed falls back to a predetermined communication speed set in advance. A transmission control procedure control method in an image communication device, characterized in that when a response from the device is not received, the procedure shifts to the standard transmission control procedure. 3. The transmission control procedure control in an image communication apparatus according to claim 2, wherein when the standard transmission control procedure is entered, the communication rate is reset to the communication rate of the standard transmission control procedure. method.