JPH09200289A - Communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten shifting time to an abbreviated protocol and to expand a communicatable range by providing the communication equipment with an abbreviated procedure signal generating means for generating the transmission rate information of an abbreviated procedure shifting signal to be informed of to an opposite machine continuously to the shifting signal. SOLUTION: A communication control part 10 to be a frequency instructing part instructs calling to a network controller 13, and when connection is detected, instructs an abbreviation shifting signal generating part 16 to send an abbreviated procedure shifting signal with frequency corresponding to a transmission rate through the controller 13. The control part 10 receives the abbreviated procedure shifting signal from the receiving side through the controller 13 and a MODEM 12. A specific frequency signal corresponding to the transmission rate of a command signal and a response signal which are mutually exchanged is used as a signal indicating shift to an abbreviated protocol.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device for performing communication in a shortened protocol procedure, and particularly, to notify by including information indicating a transmission rate in a signal notifying a shift to the shortened protocol. The present invention relates to a communication device having a control procedure.

[0002]

2. Description of the Related Art Conventionally, various proposals have been made for shortening protocol time in a communication device such as a facsimile device. In particular, some proposals have been made regarding signals for notifying the transition to the shortened protocol procedure.

For example, in Japanese Unexamined Patent Publication No. 61-98064, the calling side sends a control signal notifying the called side that communication is to be performed in a shortened protocol procedure immediately after detecting the polarity reversal signal of the called side. I am trying to do it.

In Japanese Patent Laid-Open No. 3-68262, the calling side sends a tone after detecting the CED (callee identification signal), and the called side detects the tone and stops the CED. Calling party is C
The length of ED is measured, and if it is smaller than the threshold value, NSS is transmitted at high speed to execute the shortened protocol procedure.

However, these methods are not intended to transmit the other information, merely to inform the other side that the shortened protocol procedure will be performed. Therefore, only one type of signal indicating the shortened protocol procedure must be transmitted, and the other information must be transmitted by another method.

However, if the signal indicating the shortened protocol procedure can include the necessary information without fail, the procedure time can be shortened accordingly, and the apparatus can be simplified. May be realized.

[0007]

[Problems to be Solved by the Invention] As described above,
The conventional method of notifying a shortened protocol procedure in a communication device such as a facsimile machine merely informs the other side that the shortened protocol procedure is to be performed, and is not used for any other purpose.There is room for improvement here. It is left.

Therefore, according to the present invention, the signal indicating the shift to the shortening protocol includes the information indicating the transmission speed of the command and the response to be exchanged each other, thereby ensuring the shift to the shortening protocol. , It is intended to widen the communicable range and simplify the device configuration.

[0009]

In order to achieve the above object, the present invention provides a communication device that uses a plurality of transmission rates and performs communication in a plurality of communication protocol procedures including a shortened protocol procedure. A shortened procedure shift signal generating means for generating the shortened procedure shift signal for notifying the other device of the shift including the information indicating the transmission rate of the procedure signal itself sent following the shortened procedure shift signal is provided. To do.

Here, frequency indicating means for instructing the shortening procedure transition signal generating means a specific frequency corresponding to the transmission rate as the information indicating the transmission rate is provided, and the frequency indicating means is a transmission rate which can be used by the apparatus. It is characterized in that a specific frequency with good line transparency is assigned to the highest speed and the lowest speed.

Further, there is provided frequency instructing means for instructing the shortening procedure transition signal generating means to specify a specific frequency corresponding to the transmission speed as the information indicating the transmission speed, and the frequency instructing means is used in the G3 facsimile procedure. It is characterized in that a specific frequency which is lower than the lowest one of the available frequencies is assigned to each of the transmission rates available to the device.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A facsimile apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a facsimile machine in which the present invention is implemented.

In FIG. 1, reference numeral 1 is a CP for controlling the entire apparatus.
U, 2 are a RAM used as a work area used by the control program, 3 is an operation display device for operating the device, 4 is a reading device for reading a transmission original, 5 is a printing device for recording a received image, and 6 is a code. An image processing device that performs conversion, decoding, enlargement, reduction, etc., 7 is an image storage device that stores image information, 8 is a system control unit including a ROM that stores a program that controls the device, and 9 is suitable for a digital network Communication control units 1 and 10 having a ROM storing a program for controlling communication are communication control units 2 and 1 having a ROM storing a program for controlling communication suitable for an analog network.
Reference numeral 1 is a digital network control device for connecting communication to a digital network, 12 is a modem which is a modulation / demodulation device, 13 is an analog network control device for connecting communication to an analog network, which has an automatic call originating / receiving function, 14 Is a system bus for exchanging data between the functional blocks, 15
Is a line switching control device that connects a plurality of external line interfaces and a plurality of internal communication lines.

The CPU 1 reads a program from the ROM of the system controller 8 when the apparatus is powered on, and sends a control command to each component via the system bus 14 based on this program to control the entire apparatus. .

The RAM 2 operates as a work area for the CPU 1.

The operation display device 3 is composed of a so-called touch panel or the like, and is an input / output means for inputting an instruction to the device by touching the panel and displaying the current state of the device.

The reading device 4 irradiates and scans a transmission document or a copy document with white light, and quantizes the intensity of the reflected light to convert it into a digital image signal.

The printer 5 prints out the received image signal on recording paper.

The image processing device 6 encodes the transmission data and decodes the reception data. Further, the transmission / reception data is enlarged / reduced as necessary.

The image storage device 7 is a storage device that digitally stores the image data of the original read by the reading device 4 and the received image data for each file.

The system control unit 8 is a CP for controlling the device.
It is composed of a ROM that stores a control program for U1, and the program is read by the CPU1 from the ROM when the apparatus is powered on.

The communication control unit 1 (9) is a control circuit for controlling the digital network control device 11 to execute a communication protocol suitable for a digital network, and has a ROM for storing a program for digital communication control therein. Have

The communication control unit 2 (10) is a control circuit for controlling the analog network control device 13 to execute a communication protocol suitable for an analog network, and has a ROM for storing a program for analog communication control inside. Have

The digital network control device 11 is a control device for accessing the digital network to control connection and disconnection of communication with the communication device of the other party, or to detect digital communication data.

The modem 12 converts the analog data detected by the analog network into digital data and inputs the digital data to the device through the line switching device 15. The digital data from the line switching device 15 is converted into analog data for communication control. Plays the role of sending to Part 2 (10).

The analog network control device 13 is a control device for accessing the analog network to control connection and disconnection of communication with the communication device of the other party, or for detecting analog communication data.

The system bus 14 is a bus for transmitting / receiving data between the functional blocks constituting this communication device or for transmitting control commands.

The line switching control device 15 is a switching circuit for selecting and switching which line network, a digital network or an analog network, is to be accessed for communication, and switches. The digital network control device 11 and the analog network control device 13 Is connected and controlled.

This facsimile device is connected to a device similar to this device via a communication network, to a device connectable only to an analog network, or to a device connectable only to a digital network, and facsimile communication is performed between them. I do. When this device is connected only to the analog network, the communication control unit 1 (9) and the digital network control device 11 can be omitted. When this device is connected only to the digital network,
The communication control unit 2 (10), the modem 12, and the analog network control device 13 can be omitted.

FIG. 2 is a control flowchart of the transmission protocol of the transmission operation of the facsimile apparatus having such a configuration.
~ It demonstrates according to FIG.

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 and is stored (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 2 shown in FIG. 2 in correspondence with the partner device, for example, the shortened number. Has been done.

That is, at step 102, the destination data list in the RAM 2 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 the partner machine is stored as having 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 carried out 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, CNG (calling tone) of 1100 Hz is first 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), then it is checked whether or not an NSF (non-standard function identification signal) is received from the partner device (step 106)
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), the destination data list of the RAM 2 shown in FIG. 2 described above is stored as having the shortened protocol reception capability corresponding to the shortened number of the partner machine (step 109), and the process proceeds to step 114 to send phase B. To execute.

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 ( In step 108, NO) stores in the destination data list of the RAM 2 shown in FIG. 2 that there is no shortening protocol receiving capability in correspondence with the shortened number of the partner machine (step 110) and performs normal transmission (step 111). ), End this transmission protocol.

When it is determined in step 113 that the transmission to the shortened protocol transmission has not 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 2 shown in FIG. 2 in correspondence with, for example, the shortened number of the partner machine.

That is, in step 121, the destination data list of the RAM 2 is searched based on the abbreviated number of the called party to see if the called party has the polarity reversal detection function.

If the partner machine has a 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). As will be described in detail later, the detection of the polarity reversal is also determined by whether or not the number of polarity reversals has reached the number of polarity determinations learned during the previous communication with the partner device. Then, when the polarity reversal is detected, that is, when the number of polarity reversals reaches the number of polarity determinations learned in the previous communication with this partner device (YES in step 130), the shortened protocol (short professional) transmission (Step 133).

If the polarity reversal is not detected in step 130, that is, if the number of polarity reversals does not reach the number of polarity determinations learned during the previous communication with this partner device (NO in step 130), then CED It is checked whether (the called terminal identification signal) has been received (step 131),
When the CED is received (YES in step 131),
Shift to shortened protocol (short professional) transmission (Step 1
33).

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).

When it is determined in step 121 that the partner machine 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 the transmission phase B, first, it is checked whether polling is performed (step 141). If not polled, signal transmission for instructing transition to shortened protocol (step 142), high-speed NSS (non-standard function setting signal) transmission (Step 143) is performed, and then it is checked whether a response has been received from the partner machine (step 144).

If a response is received from the partner device (YES in step 144), then the high speed NSF is performed.
It is checked whether (non-standard function identification signal) is received (step 148), and if high-speed NSF is received (step 14).
If YES, the process proceeds to shortened protocol (short professional) transmission (step 150).

If the high speed NSF is not received in step 148, that is, if the low speed command such as NSF / DIS is received (N in step 148).
O), and shifts to normal transmission (step 149).

When the response from the partner machine is not received in step 144 (N in step 144).
O), it is checked whether polarity reversal is detected (step 14).
5).

As will be described later in detail, the detection of the polarity reversal here is also 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 machine.

If the polarity reversal is not detected in step 145 (NO in step 145), the fallback parameter is set (step 146), the process returns to step 142, and a signal for instructing the shift to the shortening protocol is sent again (step 146). 142), high-speed NSS (non-standard function identification signal) is transmitted (step 143).

If polarity reversal is detected in step 147 (YES in step 147), the communication speed of the initial value is reset (step 147), and step 14
Returning to step 2, the signal transmission for instructing the shift to the shortened protocol (step 142) and the high speed NSS (non-standard function identification signal) are transmitted again (step 143).

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.

If polling is determined in step 141 (YES in step 141), a signal for instructing the shift to the shortened protocol is sent (step 15).
1), high-speed NSC (non-standard function command signal) is transmitted (step 152), and then it is checked whether a response is received from the partner machine (step 153).

Here, when the response is received from the partner device (YES in step 153), the next high speed NSS is performed.
It is checked whether (non-standard function setting signal) is received (step 157), and if the high speed NSS is received (step 15)
7), the process proceeds to the reception phase B described later with reference to FIG. 8 (step 159).

If the high speed NSS is not received in step 157, that is, if the low speed command such as NSS / DIS is received (N in step 157).
O), and shifts to normal transmission (step 158).

If no response is received from the other device in step 153 (N in step 153)
O), it is checked whether polarity reversal is detected (step 15).
4).

As will be described later in detail, the detection of the polarity reversal here is also 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 machine.

If the polarity reversal is not detected in step 154 (NO in step 154), the fallback parameter is set (step 155), the flow returns to step 151, and a signal for instructing the shift to the shortening protocol is sent again (step 155). 151), high speed NSC (non-standard function setting signal) is transmitted (step 152).

When the polarity reversal is detected in step 154 (YES in step 154), the communication speed of the initial value is reset (step 156), and step 15
Returning to step 1, the signal transmission for instructing the shift to the shortened protocol is again transmitted (step 151) and the high speed NSC (non-standard function setting signal) is transmitted (step 152).

FIG. 5 shows 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 transmitted (NO in step 177), it is then checked whether EOR (retransmission end signal) needs to be transmitted (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 P
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 control flow chart of the receiving protocol shown in FIGS.

FIG. 7 is a control flow chart 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), the reception phase B is first executed. Details of the reception phase B will be described later with reference to FIG.

When the reception phase B is completed, next, 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 phase shifts to the reception phase C (step 207). Here, in the case of transition to the reception phase C (YES in step 207), step 205
If it is not the shift to the reception phase C (NO in step 207), next, in the reception phase D, it is checked whether or not the shift to the reception phase B is performed (step 208). YE in step 208
S) Return to step 204, and if it is not the transition to the reception phase B (NO in step 208), it is the transition to the reception phase E, so the low speed DCN (disconnection command signal) is received (step 209), and this reception Terminate the protocol.

If it is not determined in step 203 that the signal instructing the shift to the shortened protocol is not received (NO in step 203), it is checked whether or not CNG (calling tone) is received (step 210), and CN
When not receiving G (NO in step 210), 1.8
Check if the seconds timer has timed out (step 21
1) If there is no timeout (N in step 211)
O), the process returns to step 203, and if the time is out (YES in step 211), CED (callee terminal identification signal) is transmitted (step 212).

When it is judged that the CNG is received in step 210, the process proceeds to step 212, and CED (callee terminal identification signal) is transmitted.

When CED is transmitted in step 212, it is checked again whether or not a signal instructing the shift to the shortened protocol is received (step 213). Here, when it is determined that the signal for instructing the shift to the shortened protocol is received (step 2
If YES at 13, the CED transmission is stopped (step 21).
4) The reception phase B of step 204 is executed.

If it is determined in step 213 that the signal not instructing the shift to the shortened protocol has not been received,
Next, it is checked whether or not the CED transmission is completed (step 215), and the CE
If the D transmission has not ended (NO in step 215), the process returns to step 212. If it is determined that the CED transmission has ended (YES in step 215), NSF / DIS is transmitted (step 216), and the protocol is further shortened. It is checked whether or not a signal for instructing the shift of is received (step 217).
Here, if it is determined that the signal is an instruction to shift to the shortened protocol (YES in step 217),
In step 204, the reception phase B is executed.

If it is determined in step 217 that the signal for instructing the shift to the shortened protocol has not been received (NO in step 217), normal reception is performed (step 218), and this reception protocol ends.

FIG. 8 shows details of the processing in the reception phase B of step 204 shown in FIG.
In the reception phase B, it is first checked whether or not the high-speed NSS (non-standard function setting signal) is received (step 21).
1). If a high speed NSS is received here (step 211)
If YES, the high speed NSF (non-standard function identification signal) is transmitted (step 222) and the process returns.

If the high speed NSS is not received in step 211 (NO in step 211), the next high speed NSC
It is checked whether (non-standard function command signal) is received (step 22).
3). If the high speed NSC is not received (NO in step 223), the process returns to step 221. If the high speed NSC is received (YES in step 223), it is checked whether polled is OK (step 224). Here, in the case of polled OK (YES in step 224), the process proceeds to the transmission phase B shown in FIG. 5 (step 225), and in the case of not polled OK (NO in step 224), a predetermined error process is executed (step S225). Step 226).

FIG. 9 shows details of the processing in the reception phase C of step 205 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. 10 shows details of the processing in the reception phase D of step 206 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). If the RCP frame is received (YES in step 241), step 2
Proceed to 43. 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.

If it is determined in step 243 that the FCD frame is not OK (step 243 returns N
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) has been received (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 set (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).

The part relating to the mode transition from the above basic protocol procedure to the shortened protocol will be described in more detail with reference to the sequence charts shown in FIGS. 11 to 13. Here, FIGS. 11 to 13 show basic transmission / reception protocol procedures in three cases of mode transition to the shortened protocol.

First, the transmitting side will be described.

FIG. 11 shows a first case of mode transition to the shortened protocol. In this first 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 RAM 2 in FIG. 1) corresponding to the shortened number of the partner device (reception side) (step 103 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) has the polarity reversal detection function (step 121 in FIG. 3). If it has the polarity reversal detection function, the polarity is detected. 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 transmitted (step 142 in FIG. 4). It moves to the protocol, to perform 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.

After shifting to the shortened protocol, the transmitting side
First, a signal indicating the communication speed of the high speed command (a signal instructing the transition to the shortened protocol) is followed by a high speed NSS.
(Non-standard function setting signal) is transmitted (step 14 in FIG. 4).
3) 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 148 in FIG. 4), the process proceeds to the image information transmission phase (transmission phase C shown in FIG. 5).

Further, 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 221 in FIG. 8). ), The high-speed NSF is transmitted (step 222 in FIG. 8), and the process proceeds to the image information reception phase (reception phase C shown in FIG. 9).

In the transmission side image information transmission phase (transmission phase C), 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 respond command waiting phase (transmission phase D shown in FIG. 6)
Move to.

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 ECM frame 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. 9), and the process shifts to the respond command waiting phase (reception phase D shown in FIG. 10).

In the reply command waiting phase (transmission phase D) on the transmitting side, when the MCF (message confirmation signal) is received (step 173 in FIG. 6), the contents of the post message command set in the destination RCP frame are sent. 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), the MCF (message confirmation signal) is transmitted (step 24 in FIG. 10).
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. 10), 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 receiving phase E, when the DCN from the transmitting side is received, this receiving protocol is terminated.

FIG. 12 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 RAM 2 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) has the polarity reversal detection function (step 121 in FIG. 3). If it has the polarity reversal detection function, the polarity is detected. Check the inversion (step 127, step 130 in FIG. 3), and C before detecting the polarity inversion.
When the ED (callee identification signal) is detected (step 131 in FIG. 3), a signal instructing the shift to the shortened protocol is sent (step 142 in FIG. 4) to shift to the shortened protocol and execute the shortened protocol. .

If the opposite device (reception side) does not have 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).
42) 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 212 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 213 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. 13 shows a third case of 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 2 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. 2), 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 107 in FIG. 2),
In the case of the NSF of its own machine, it is checked whether or not there is a shortened protocol receiving capability (step 108 in FIG. 2). The shortened protocol reception capability is stored in correspondence with the shortened number of the partner device (reception side) (step 109 in FIG. 2), and then a signal instructing the shift to the shortened protocol is sent (step 14 in FIG. 4).
2) Move to the shortened protocol and execute 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 a shift to the shortened protocol has been received from the transmitting side until (called terminal identification signal) is sent (step 203 in FIG. 7), and CED is sent without receiving the signal. If it is necessary, the CED is transmitted (step 212 in FIG. 7), and it is checked whether or not the signal instructing the shift to the shortened protocol is received while transmitting the CED (step 213 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 sent (step 216 in FIG. 7), and it is further checked whether or not a signal instructing the shift to the shortened protocol has been received (step 217 in FIG. 7). When the signal is received, the shortened protocol is shifted to, 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, 3 related to the shift to the shortened protocol
The basic part of one protocol procedure was explained, but other procedures (eg ECM frame retransmission procedure)
2 to 10, ITU-T Recommendation T.264. It operates according to 30.

By the way, in the case of FIG. 11, when the polarity reversal is detected, a signal instructing the shift to the shortened protocol is sent to shift to the shortened protocol, and the shortened protocol is executed. In the case of FIG. 12, when CED is detected, a signal instructing the shift to the shortened protocol is sent to shift to the shortened protocol, and the shortened protocol is executed. Further, in the case of FIG. 13, when NSF is received after CED, a signal instructing the shift to the shortened protocol is sent to shift to the shortened protocol, and the shortened protocol is executed.

In any case, the signal instructing the shift to the shortened protocol is output at the initial stage of communication. The signal instructing the shift to the shortened protocol includes the information of the subsequent communication speed and is transmitted.

Specifically, the signal instructing the shift to the shortening protocol is a signal of a specific frequency selected from a plurality of frequencies, and each of the plurality of frequencies is assigned to each transmission rate that can be used by the device. .

Now, four transmission rates [9600 bps,
7200 bps, 4800 bps, 2400 bps].

For example, in the shortened protocol procedure shown in FIG. 11, since the command and the response are exchanged at any one of the four transmission rates suddenly, in order to convey the transmission rate to the partner device, A "signal for notifying the shift to the shortened procedure" that corresponds to the transmission speed and can be identified is required. Here, "signals for notifying the shift to the shortening procedure" corresponding to each transmission rate are created at different frequencies, and A (Hz) and B are sequentially arranged from the lowest frequency.
(Hz), C (Hz), and D (Hz). (A <
B <C <D) FIG. 14 shows the first part of the shortened protocol procedure shown in FIG.
(Hz), B (Hz), C (Hz), or D (Hz) signal is used.

By the way, the communication device has a so-called "fallback function" for selecting an optimum transmission rate for a change in signal level.

When setting this fallback characteristic, it is necessary to satisfy two different conditions. One is to make the communication range as wide as possible, and the other is to reliably transmit a signal notifying the transition to the shortening procedure.

By the way, the receiving side starts the fallback operation peculiar to the shortening procedure by detecting the signal notifying the shift to the shortening procedure. Therefore, in this procedure, the first signal, that is, the shortened procedure transition signal of 9600 bps needs to be reliably transmitted. At the same time, even in the worst case, communication cannot be established unless the signal indicating 2400 bps is transmitted.

Generally, the signal level of a signal is attenuated by passing through the line. Further, the amount of attenuation increases as the length of the line increases, and increases with the frequency of the signal per unit line length. On the other hand, the lower the communication speed, the better the resistance against the line quality.

Therefore, it is preferable to allocate the high frequency having the widest detection range to the minimum and maximum transmission rates which are most important in the fallback setting.

Therefore, the frequency of the signal indicating 2400 bps has the highest frequency and therefore the frequency D (H
z) is assigned to the signal indicating 9600 bps, respectively, with the frequency C (Hz) having the next highest frequency and thus the widest detection range. Furthermore, 7 is added to the signal indicating 7200 bps.
Frequency A (Hz) that satisfies the operating range of 200 bps,
Similarly, B (Hz) that satisfies the operating range is assigned to the signal indicating 4800 bps.

FIG. 15 shows the signal detection characteristics of each frequency and the fallback of each transmission rate with respect to the detection range.

By the way, these signals A (Hz) to D
(Hz) increases or decreases depending on the type of transmission speed of the device. Also, because it is necessary to detect separately from other signals,
It is assumed that a frequency lower than the lowest frequency signal (CNG: 1100 Hz) used in the G3 facsimile procedure is used. This allows a single low-pass filter to separate the signal notifying the transition to the shortening procedure.

FIG. 16 is a flow chart showing the transmission control of the signal notifying the shift to the shortening procedure on the transmitting side.

At the transmitting side, first, the network controller is instructed to make a call (step 301). Next, it waits for connection detection on the receiving side (step 302). When the connection is detected, the command transmission rate is determined (step 303). Usually try from maximum speed.

Next, a frequency coefficient corresponding to the transmission speed is set in the shortening procedure transition signal generator. Then, the shortening procedure shift signal generator outputs the shortening procedure shift signal of the set frequency (step 304). Then, it instructs the modem to send a command. The modem now sends a command (step 305).

Next, the signal for shortening procedure transition from the receiving side is waited (step 306), the modem receives the response from the receiving side, and receives the response from the modem (step 307). After that, the request and the other party's ability are adjusted, the communication speed of the image information is determined, and the image information is transmitted.

FIG. 17 is a functional block diagram around the communication control unit 10 and the network control device 13 of the embodiment shown in the flowchart of FIG.

As shown in the figure, the communication control unit 10 which is also a frequency instructing unit instructs the network control unit 13 to make a call, and when a connection is detected, it instructs the shortening transition signal generating unit 16 to correspond to the transmission rate. The frequency shortening procedure shift signal is transmitted via the network control device 13. The communication control unit 10 receives the shortened procedure transition signal from the receiving side by the network control device 13 and receives it via the modem 12.

[0141]

As described above, in the present invention, a specific frequency signal corresponding to the transmission speed of the command signal and the response signal which are to be exchanged with each other is used as the signal indicating the shift to the shortening protocol. . This time,
Allocate low frequency signals with good line transparency to the lowest and highest transmission rates.

As a result, the shift to the shortening procedure can be made more reliable, the communicable range can be made wider, the device configuration can be simplified, and the time required to shift to the shortened protocol can be shortened.

[Brief description of drawings]

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

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

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

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

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

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

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

8 is a flowchart showing details of processing in a reception phase B in the reception protocol shown in FIG.

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

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

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

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

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

14 is a diagram showing an improvement of the shortened protocol transition signal at the beginning of the sequence chart shown in FIG.

FIG. 15 is an explanatory diagram showing a transmission speed fallback characteristic and a frequency signal detection characteristic corresponding to the fallback characteristic.

16 is a flowchart for sending a shortened procedure transition signal corresponding to the sequence chart of FIG.

17 is a functional block diagram of a signal input / output unit that executes the flowchart of FIG.

[Explanation of symbols]

 1 CPU 2 RAM 3 Operation Display Device 4 Reading Device 5 Printing Device 6 Image Processing Device 7 Image Storage Device 8 System Control Unit 9 Communication Control Unit 1 10 Communication Control Unit 21 11 Digital Network Control Device 12 Modem 13 Analog Network Control Device 14 System Bus 15 Line switching control device 16 Shortening procedure transition signal generator

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[Procedure amendment]

[Submission date] February 1, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 14

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

[Procedure 3]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 16

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

Front page continuation (72) Inventor Hirotaka Kawabata 3-7-1 Fuchu, Iwatsuki City, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Office

Claims (3)

[Claims] 1. A communication device that uses a plurality of transmission speeds and communicates in a plurality of communication protocol procedures including a shortened protocol procedure, wherein the shortened procedure transition signal for notifying a partner device of the transition to the shortened protocol procedure is shortened. A communication device comprising a shortened procedure shift signal generating means for generating information including a transmission rate of a procedure signal itself sent subsequent to the procedure shift signal. 2. A frequency instructing means for instructing the shortening procedure transition signal generating means of a specific frequency corresponding to the transmission speed as the information indicating the transmission speed is provided, and the frequency instructing means indicates the transmission speed that the device can use. 2. The communication device according to claim 1, wherein specific frequencies having good line transparency are respectively assigned to the highest speed and the lowest speed. 3. A frequency instructing means for instructing the shortening procedure transition signal generating means of a specific frequency corresponding to the transmission speed as the information indicating the transmission speed is provided, and the frequency instructing means is used in a G3 facsimile procedure. 2. The communication device according to claim 1, wherein a specific frequency that is lower than the lowest frequency among the available frequencies is assigned to each of the transmission rates available to the device.