JP3682795B2 - Communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication apparatus such as a facsimile machine, a personal computer, and a modem, and more particularly to a communication apparatus having a function of negotiating communication instruction parameters.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, in a facsimile apparatus, there are the following techniques when the communication parameter to be transmitted does not match the capability declared by the receiver. In Japanese Patent Publication No. 5-31343, the transmission device receives a paper width signal from the reception device, automatically converts the document size of the transmission device to the paper width of the reception device side, and transmits the received document size. A technique for reducing and printing when it is larger than the paper width is disclosed, and similar techniques are also disclosed in Japanese Patent Laid-Open Nos. 4-1595959 and 6-326850. Japanese Patent Application Laid-Open No. 60-64572 discloses a technique for transmitting accumulated encoded data into encoded data that can be restored by the counterpart device, and disclosed in Japanese Patent Application Laid-Open No. 60-182257. A similar technique is disclosed.
[0003]
[Problems to be solved by the invention]
In the conventional communication device as described above, when the communication parameter to be transmitted does not match the capability declared by the receiver, first the reception capability is declared from the reception side, and the transmission side This is a procedure in which the apparatus determines the transmission parameter and performs communication. Therefore, when trying to adopt a protocol in which a parameter to be transmitted is first notified from the transmission side to the reception side and then the reception capability is notified from the reception side, there are the following problems.
[0004]
If the transmitting device has higher capability and the receiving device cannot analyze an instruction exceeding its own capability, for example, the transmitting device instructs a communication speed of 14.4 kbps, but the receiving device has only 9.6 kbps capability. If there is no DCS command and the transmission side capability is to be notified, the 14.4 kbps instruction in the DCS has bit numbers 14, 13, 12, and 11 as (1, 0, 0, 0). However, when the receiving side analyzes only up to 9.6 kbps, only bits 12 and 11 are recognized, and bits 14 and 13 are ignored. In the above case, bits 12 and 11 are (0, 0), which is interpreted as an indication of 2.4 kbps. In other words, even though the sending side has instructed 14.4 kbps, the receiving side recognizes that 2.4 kbps has been instructed, and even though it can communicate at 9.6 kbps, it will be 2.4 kbps. There was a problem.
[0005]
This problem also occurs with regard to resolution. Bits indicating standard resolution (8 × 3.85) and high resolution (8 × 7.7) and bits indicating higher super-resolution are assigned to different positions. For this reason, there is a problem in that if the partner apparatus does not have the ability to interpret the instruction even if the super high resolution is instructed, it cannot be determined whether the partner apparatus has the standard resolution or the high resolution.
[0006]
The object of the present invention is to solve the above-mentioned problems of the prior art, and in the transmission method in which communication parameters are notified from the transmission side device, when the reception side device does not have the capability to correspond to the parameters desired by the transmission side device. However, it is to provide a communication device that can negotiate without problems.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a communication speed. Or resolution including In a communication apparatus having means for setting a communication instruction parameter as a command and transmitting it, one communication instruction parameter Multiple communication capabilities of own device Instruction content As A setting means for setting is provided.
[0008]
According to the present invention, in the transmission method for notifying the communication parameter from the transmission side device, the transmission side can notify all the capabilities of the transmission side to the reception side. Even if there is no capability to interpret the parameters of the part, by selecting the highest capability from the capabilities that can be interpreted, transmission according to the capability of the receiving apparatus can be performed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a system configuration example of a facsimile apparatus to which the present invention is applied. This facsimile apparatus includes a CPU 1 for controlling the entire facsimile apparatus, a RAM 2 as a work area used when executing the control program, an operation display apparatus 3 provided with a display screen and operation switches for operating the facsimile apparatus, and a transmission original. A reading device 4 that prints and outputs received image information and the like, an image processing device 6 that performs image processing such as encoding / decoding / enlargement / reduction, image information to be transmitted or received image information An image storage device 7 to be stored and a ROM 8 storing a program for controlling the entire facsimile apparatus are provided.
[0010]
Further, this facsimile apparatus is provided in a first communication control unit 9 constituted by a ROM storing a circuit and a program for controlling communication (G4, etc.) in a digital network (ISDN network, etc.) and an analog network (G3, etc.). A second communication control unit 10 composed of a ROM storing a circuit for controlling communication and a program, a digital network control device 11 for connecting to a digital network, and a plurality of external line interfaces and a plurality of internal units by switching A line switching control device 15 for connecting to a communication circuit is provided, and the above devices are connected to each other by a system bus 14.
[0011]
The first communication control unit 9 is directly connected to the line switching control device 15, and the second communication control unit 10 is connected to the line switching control device 15 via a modem 12 having a low speed mode and a high speed mode. . The line switching control device 15 is further connected to the digital network control device 11 and the analog network control device 13.
[0012]
The facsimile apparatus having the above configuration is connected via a line to a partner machine such as a facsimile apparatus having the same configuration, a facsimile apparatus that can be connected only to an analog network, or a facsimile apparatus that can be connected only to a digital network. When the facsimile apparatus is connected only to the analog network, the first communication control unit 9 and the digital network control apparatus 11 can be omitted. When the facsimile apparatus is connected only to the digital network, the second communication is performed. The control unit 10, the modem 12, and the analog network control device 13 can be omitted.
[0013]
FIGS. 2A, 2B, and 3 are flowcharts showing an example of a transition procedure to a shortening procedure that does not use TCF, which is a premise of the present invention. For example, in the procedure of FIG. 2A, when the transmission side device makes a call and the reception side device responds, the transmission side device detects the response and sends a shortened procedure transition control signal 20. Thereafter, using a high-speed modem, the training signal 21 and the high-speed NSS signal 22 are transmitted at a predetermined speed, for example, 9.6 kbps of V29.
[0014]
FIG. 5 is an explanatory diagram showing a format example of the high-speed NSS signal of the present invention. The NSS signal 30 is transmitted using an HDLC frame, and a code indicating NSS is set in the facsimile control field (FCF) 31 which is the first byte of the information area. In the subsequent FIF 32, specification information such as capability is set in a format unique to each company. In this example, independent 2-bit or 4-bit capability setting areas 33 and 34 are provided for the three modulation standards V27ter, V29, and V17, and the respective transmission capacities can be set independently. .
[0015]
FIG. 4 is a flowchart showing a process for setting speed information in the NSS signal of FIG. In step S201, the transmission speed to be instructed is determined by recognizing the capability of the modem of the own device or referring to past communication history information with the same counterpart device. In steps S202 to S209, the speeds are determined in order of increasing speed, and the process proceeds to any of corresponding steps S210 to S217 depending on the transmission speed to be instructed. It should be noted that if a normal modem has a certain speed capability in the order of steps S202 to S209, it is assumed that all lower capabilities are provided.
[0016]
For example, when V17 is 14.4 kbps, the process proceeds to step S210. In step S210, (1, 0) is set in the area of V17-1 in FIG. Thereafter, the process proceeds to step S212, where (1, 0) is set in the V17-2 area, (1, 0) is set in the V29 area in step S214, and (1, 0) is set in the V27ter area in step S216. Set each. Therefore, on the receiving side, even if there is only capability up to V29 and there is no analysis capability of V17, it is possible to recognize that the capability display of V29 has a capability of (1, 0), that is, 9.6 kbps. Therefore, an appropriate judgment can be made.
[0017]
FIG. 7 is an explanatory diagram showing a second embodiment of the format of the high-speed NSS signal according to the present invention. This example is an example of displaying the capability of the resolution. In FIG. 7, independent 1-bit capability setting areas 35 and 36 are provided for each of a plurality of resolution standards. Therefore, each resolution can be set independently.
[0018]
FIG. 6 is a flowchart showing processing for setting resolution information in the NSS signal of FIG. In step S301, the resolution to be instructed is determined by referring to an instruction from the panel or past communication history information with the same counterpart device. In steps S302 to 309, the resolutions are determined in order of fineness, and the process proceeds to one of steps S310 to 317 corresponding to the resolution to be instructed. Normally, if there is a certain resolution capability in the order of steps S302 to S309, all the capabilities below that are provided. In addition, a bit for identifying whether it is an inch system or a millimeter system exists separately in the signal.
[0019]
For example, if it is 300 ppi × 300 ppi, the process proceeds to step S311. In step S311, “1” is set in the area corresponding to 300 ppi × 300 ppi in FIG. In steps S312, 313, and 314, “1” is set in the areas corresponding to 8 dots × 15.4 l / mm, 200 ppi × 400 ppi, 8 dots × 7.7 l / mm, and 8 dots × 3.85 l / mm, respectively. . Therefore, even if the receiving side has only the capability up to 8 dots × 7.7 l / mm, it has the capability of 8 dots × 7.7 l / mm and 8 dots × 3.85 l / mm from the capability display of NSS. Therefore, it is possible to make an appropriate judgment.
[0020]
Hereinafter, details of processing of the transmission side and reception side devices in the shortening procedure to which the present invention is applied will be described. 8 to 12 are flowcharts showing processing on the transmission side. In step S <b> 1 of FIG. 8, a call is made according to the telephone number input from the operation display device 3. When the telephone number is stored in advance in the RAM 2 as an abbreviated dial, the abbreviated number is read to make a call. In Steps S2 and S3, the RAM 2 is searched to determine whether or not the shortened procedure reception capability is stored in the capabilities of the counterpart machine registered in correspondence with the speed dial. The capability of the partner machine can be registered in advance, but can also be registered according to the result of the protocol procedure. The following describes a case where registration is performed based on the result of executing the protocol procedure.
[0021]
In the first communication with the partner apparatus, the determination result in step S3 is negative, and the process proceeds to step S4 to send CNG (ringing sound). While sending CNG, in step S5 it waits for reception of a CED (called station identification) signal or some command. If the command is received, the process proceeds to step S6, and it is determined whether or not NSF (non-standard function signal) is received. If the NSF is received, the process proceeds to step S7, where it is determined whether this NSF is of the same company type as the own machine. If it is determined that it is the same company as the own device, the process proceeds to step S8, where it is determined whether or not there is a reception capability of a shortened procedure (shortened protocol: indicated as “Short Pro” in the figure). Then, information corresponding to “with abbreviated procedure reception capability” is registered in the RAM 2 in correspondence with the speed dial. If the partner function is registered, the process proceeds to the transmission phase B of step S14. Details of the transmission phase B are shown in FIG. Transition case 3 to this shortening procedure corresponds to the procedure diagram of FIG.
[0022]
If NSF is not received, and if NSF is received but is not the same company's NSF, if the partner machine does not have a shortened procedure reception capability, that is, if the determination in steps S6 to S8 is negative Proceeding to S10, “no shortening procedure reception capability” is registered in the RAM 2 in correspondence with the speed dial. If the partner function is registered, the process proceeds to the normal transmission mode in step S11, that is, the transmission mode that is not a shortened procedure.
[0023]
If it is registered that the partner machine has the short procedure reception capability, the determination in step S3 is affirmative and the process proceeds to transmission phase A in step S12. Details of the transmission phase A will be described later with reference to FIG.
[0024]
In step S13, it is determined whether transmission is in the shortened procedure mode or normal transmission. This is determined from the execution result of the transmission phase A (step S12). If it is normal transmission, the process proceeds to step S6. If the transmission is in the shortened procedure mode, the process proceeds to transmission phase B (FIG. 10) in step S14. If the transmission phase B is executed, the process proceeds to step S15, and it is determined again whether or not the transmission is in the shortened procedure mode based on the execution result of the transmission phase B (step S14). If it is the shortened procedure mode, transmission phases C and D are executed in steps S16 and S17, respectively. In step S18 and step S19, based on the execution result of transmission phase D, it is determined whether or not to proceed to transmission phases C and B, respectively. If the process does not proceed to the transmission phase C or B, that is, when the process proceeds to the phase E, the low-speed DCN is transmitted in step S20 to terminate the transmission.
[0025]
Next, the transmission phase A will be described. In FIG. 9, in step S <b> 21, it is determined whether or not the own device has a polarity reversal detection function. If there is a polarity reversal detection function, a CNG transmission start timer is started in step S22, and it is determined whether polarity reversal is detected in step S23. If the polarity reversal is detected, the process proceeds to step S29 to shift to the shortening procedure mode. This transition case 1 corresponds to the procedure diagram of FIG. Polarity reversal is detected until the timer times out (step S24), and if timed out, the process proceeds to step S25 to send CNG (ringing tone).
[0026]
In step S26, it is determined whether polarity reversal has been detected. If the polarity reversal is detected, the process proceeds to step S29 to shift to the shortening procedure mode. If polarity inversion is not detected, the process proceeds to step S27 to determine whether or not CED (called station identification) is received. If the CED has been received, the process proceeds to step S29 and shifts to the shortened procedure mode. This transition case 2 corresponds to the procedure diagram of FIG. If no CED has been received, the process proceeds to step S28 to determine whether or not a low-speed command such as NSF / DIS has been received. If no low-speed command has been received, the process proceeds to step S25. If a low-speed command is received, the process proceeds to step S33 and shifts to the normal transmission mode.
[0027]
On the other hand, if it is determined in step S21 that there is no polarity reversal detection function, the process proceeds to step S30 to send CNG (ringing tone). In step S31, it is determined whether or not CED is received. If the CED has been received, the process proceeds to step S29 to shift to the shortened procedure mode. If no CED has been received, the process proceeds to step S32 to determine whether or not a low speed command has been received. If the CED has been received, the process proceeds to step S33 and shifts to the normal transmission mode. If no CED has been received, the process proceeds to step S30. As described above, in the transmission phase A, when polarity inversion or CED is detected, the mode is immediately shifted to the shortened procedure mode.
[0028]
Next, the transmission phase B will be described. In FIG. 10, it is determined whether or not polling is performed in step S34, and in the case of polling, steps S44 to S52 are executed. If not polling, the process proceeds to step S35, and a predetermined single tone is transmitted. This single tone is a shortened procedure transition signal and has a frequency corresponding to the transmission speed of the high-speed NSS (non-standard function setting) transmitted in step S36. In step S36, for example, a training signal of 9600 bps and a high-speed NSS are transmitted. The high-speed NSS is the training signal 21 and NSS 22 in FIG. 1, and the format is shown in FIG. 5 or FIG. The capability setting process is shown in FIG. 4 or FIG.
[0029]
In step S37, it is determined whether or not there is a response from the counterpart device to NSS. If there is a response, the process proceeds to step S38, and it is determined whether or not the response is a high-speed NSF (non-standard function). If the high-speed NSF is received, the process proceeds to step S39 to shift to the shortened procedure mode. If the high-speed NSF is not received, that is, if it is a low-speed command, the process proceeds to step S40 and shifts to the normal transmission mode.
[0030]
If it is determined in step S37 that no response is received, the process proceeds to step S41 to determine whether polarity reversal is detected. This is because the inversion detection in step S23 or S26 may be a false detection. If polarity inversion is not detected, the process proceeds to step S43, the fallback parameter is set, and the process proceeds to step S35. If polarity inversion is detected, the process proceeds to step S42 to reset the transmission speed to the initial value. Therefore, the speed once reduced by the fallback in step S43 is returned to high speed. Note that when the fallback occurs here, the transmission speed of the image information also becomes the fallback speed.
[0031]
In the case of polling, steps S44 to S52 are executed. Steps S44 to S51 are procedures for reception and have substantially the same contents as steps S34 to S38 and S40 to S43. In step S52, a later-described reception phase B (FIG. 14) is executed.
[0032]
Next, the transmission phase C will be described. In this transmission phase C, the frame is divided into frames by ECM (error correction mode), and in the first frame (frame No. 0), parameters indicating image information of the second and subsequent frames or NSS information are set. Set and send image information after the frame. In FIG. 11, first, in step S53, it is determined whether or not the image information is to be retransmitted. In the case of retransmission, in step S54, image information to be retransmitted is set in a frame and transmitted. In step S55, it is determined whether or not retransmission has ended. If retransmission has ended, the process proceeds to step S59.
[0033]
If it is not retransmission of the image information, that is, if it is the first transmission, the process proceeds to step S56, where the frame No. Set NSS information to 0 and send. The NSS information is finally determined based on the result of negotiation with the partner machine, and may be the content of the NSS sent in step S36 or may be changed according to the result of negotiation. In some cases. Since NSS is sent in step S36, it is sufficient that at least the document size and image quality information are included here.
[0034]
In step S57, the second and subsequent frames, that is, the frame No. The image information is set after 1 and transmitted. In step S58, it is determined whether or not transmission of all image information has been completed. If it is determined that transmission has ended, the process proceeds to step S59. In step S59, the content of the post message command is set in the FIF of the RCP frame 24 of FIG. 2A and transmitted, and the process proceeds to the response command reception waiting phase (transmission phase D).
[0035]
Next, the transmission phase D will be described. In FIG. 12, it is determined in step S60 whether or not a response has been received. If no response is received, the process proceeds to step S61, and a low-speed post message command (PPS • Q or PPS • Pri-Q) is transmitted. If a response is detected, the process proceeds to step S62, and it is determined whether or not the content of the response is a low-speed MCF (message confirmation signal). When the low-speed MCF is received, the process proceeds to step S76. On the other hand, if the response is not a low-speed MCF, the process proceeds to step S63 to determine whether or not the response is a low-speed PPR (partial page request). If this determination is negative, the process proceeds to step S64, and it is determined whether or not the response is a low-speed PIP (Yes in procedure interruption). If PIP is detected, the line hold procedure is executed in step S65, and the process proceeds to step S76. If the response is not any of low-speed MCF, PPR, and PIP, it is determined as an error, and the process proceeds to step S66 to perform error processing.
[0036]
If a low-speed PPR is received, the process proceeds from step S63 to step S67 to determine whether or not CTC (continuation of correction) needs to be transmitted. If necessary, the process proceeds to step S68 to send a low-speed CTC. This is performed until a low-speed CTR (correction continuation response) is received in step S69. Then, if a low-speed CTR is received, the process proceeds to phase C.
[0037]
If it is determined in step S67 that CTC transmission is unnecessary, it is determined in step S71 whether transmission of EOR (retransmission end) is necessary. If it is not necessary to send EOR, the process proceeds to step S76. If it is necessary to send EOR, the process proceeds to step S72, and a low-speed EOR is sent. In step S73, it is determined whether or not a low-speed ERR (retransmission end response) has been received. If a low-speed ERR has been received, the process proceeds to step S76. If the low-speed ERR is not received, it is determined whether or not a low-speed PIN (procedure interruption negative) has been received. This determination is based on the ITU-T recommendation T.30. When the EOR is transmitted three times and the T4 timer times out as defined in the procedure of 30, DCN (line disconnection command) is transmitted to disconnect the line. If a low-speed PIN is received, the process proceeds to step S75 to perform a line hold procedure.
[0038]
In step S76, based on the post message command sent in step S59 (transmission phase C), the phase to be transferred next is determined. Based on this determination, the process proceeds to one of steps S77, S78, and S79, and shifts to any of phases C, D, and E.
[0039]
Next, the reception protocol will be described with reference to FIGS. First, in FIG. 13, it is determined whether or not there is an incoming call in step S80. If there is an incoming call, the process proceeds to step S81 and a 1.8 second timer is started. This timer is an ITU-Recommended T.264 standard. 30. In step S82, it is determined whether or not a signal for instructing the transition to the shortened procedure mode, that is, the reception of a single tone indicating the high NSS transmission rate is received. When the signal is received, the mode shifts to the shortened procedure mode (transition case 1: FIG. 2A). In step S83, the reception phase B (FIG. 14) is executed. Subsequent to the reception phase B, the reception phase C (FIG. 15) in step S84 is executed, and in step S85, the reception phase D (FIG. 16) is executed. In step S86, it is determined whether to proceed to phase C, and in step S87, it is determined whether to proceed to phase B. If the determination in step S86 is affirmative, the process proceeds to step S84. If the determination in step S87 is affirmative, the process proceeds to step S83. If neither phase C nor B is entered, the process proceeds to step S88 where low-speed DCN is received and communication is terminated.
[0040]
If no signal is received in step S82, it is determined in step S89 whether CNG is received. If CNG cannot be received, the determinations in steps S82 and S89 are repeated until it is determined in step S90 that a timeout has occurred. When CNG is received or when a time-out occurs, the process proceeds to step S91 to send CED. In step S92, it is determined whether or not a signal instructing transition to the shortened procedure mode is received. If a signal instructing the transition to the shortened procedure mode is received, the process proceeds to step S93 to stop sending the CED, transition to the shortened procedure mode (transition case 2: FIG. 2B), and proceed to step S83. .
[0041]
If the signal could not be received in step S92, the process proceeds to step S94, and it is determined whether CED transmission has been completed. When the sending of CED is completed, the process proceeds to step S95, and NSF / DIS is sent. In step S96, it is determined whether or not a signal instructing transition to the shortened procedure mode has been received. If a signal instructing the transition to the shortened procedure mode is received, the procedure proceeds to the shortened procedure mode (shift case 3: FIG. 3) and proceeds to step S83. If the signal is not received, the procedure proceeds to step S97. To shift to normal reception mode.
[0042]
Next, the reception phase B will be described. In FIG. 14, it is determined in step S98 whether or not a high-speed NSS has been received. If the high-speed NSS is received, the process proceeds to step S99, the speed and the like are determined with reference to the contents of the NSS, and the high-speed NSF is transmitted. When the high speed NSS is not received from the transmitter, the process proceeds to step S100 to determine whether or not the high speed NSC is received. This is to determine whether or not to perform polling in a shortened procedure. Steps S98 and S100 are repeated until high speed NSS or high speed NSC is received in this way. If the determination in step S100 is affirmative, it is determined in step S101 whether or not polling preparation is complete. If ready, the process proceeds to step S102, and a transmission phase B (FIG. 10) is executed to transmit the document. If polling preparation is not completed, a predetermined error procedure is executed in step S103, and the process ends.
[0043]
Next, the reception phase C will be described. In this reception phase C, image information transmitted by being divided into ECM frames is received. In the frame configuration, a parameter indicating image information is set in the first frame (frame No. 0), and image information is set in the second and subsequent frames.
[0044]
In FIG. 15, in step S104, it is determined whether or not an FCD (facsimile encoded data) frame, that is, an image information frame has been received. If this determination is affirmative, the process proceeds to step S105, where the frame No. It is determined whether 0, that is, whether the first frame NSS has been received or not. If the first frame is received, the determination in step S105 is affirmative, and the NSS is analyzed in step S106. If the first frame has not been received, it is determined that the second and subsequent frames, that is, the frame of the image information has been received, the process proceeds to step S107, and the received image information is stored in the image storage device 7. In step S108, it is determined whether or not the reception of the frame is completed, and the process proceeds to step S104 until this determination becomes affirmative. If the reception of the FCD frame is completed without affirmative in step S108, it is a case where there is an RCP frame in the last frame, and the process proceeds to step S109 to analyze the RCP frame post message command. When the analysis of the post message command or the reception of the frame is completed, the reception phase C is exited.
[0045]
Next, the reception phase D will be described. In step S110, it is determined whether or not RCP is received. If the phase D is not received without receiving the RCP, the process proceeds to step S111 to wait for a low speed command. If RCP has been received or if a low-speed command has been received, the process proceeds to step S112 to determine whether or not there is an error in the received FCD frame. If there is no error in the FCD frame, the process proceeds to step S113, where it is determined whether or not the line is held. If this determination is affirmative, a line hold procedure is executed in step S114. If it is not line hold, the process proceeds to step S115 to send the low-speed MCF, and the process proceeds to step S124.
[0046]
If there is an error in the FCD frame, the process proceeds to step S116 to send a low-speed PPR (partial page request). In step S117, it is determined whether or not a CTC has been received. If CTC is received, it will progress to step S118 and will transmit low-speed CTR. If no CTC has been received, the process advances to step S119 to determine whether an EOR has been received. If EOR is not received, the process proceeds to phase C. If EOR is received, the process proceeds to step S121, where it is determined whether or not the line is held. If this determination is affirmative, the line hold procedure is performed in step S122. Execute. If it is not the line hold, the process proceeds to step S123, the low speed ERR is transmitted, and the process proceeds to step S124. In step S124, based on the received post message command, a phase to be transferred next is determined. Based on this determination, the process proceeds to one of steps S125, S126, and S127, and shifts to one of phases C, D, and E.
[0047]
2 and 3 are flowcharts of the protocol procedure described above. FIG. 2A shows a procedure in the case where the polarity reversal is detected and the mode shifts to the shortened procedure mode (transfer case 1). In the figure, “Signal” is a signal indicating the transition to the shortened procedure mode, and the RCP frame (PPS / MPS) 24 indicates that the PPS / MPS of the post message command is set in the RCP frame. PPS · EOP) indicates that the PPS · EOP of the post message command is set in the RCP frame. The FCD frame (PIX) indicates that image information PIX is set in the FCD frame. 27ter, V.I. 29 (option), V.I. An echo protection tone which is an unmodulated carrier signal defined in 17 etc. is shown.
[0048]
FIG. 2B shows a procedure when the CED is detected before the polarity reversal is detected and the mode is shifted to the shortened procedure mode (transition case 2). FIG. 3 shows a case in which the reception capability of the shortened procedure mode is not stored in the registered contents of the capability of the counterpart machine, and the shift to the abbreviated procedure mode is made after judging the reception capability of the shortcut procedure by the NSF command from the counterpart machine. The procedure for doing this is shown below. 2 and 3, the procedure after the transition to the shortened procedure mode, that is, the step after sending the “signal” from the transmitting side is common to each other.
[0049]
【The invention's effect】
As described above, in the present invention, in a communication apparatus having means for setting a communication instruction parameter such as a communication speed and resolution as a command and transmitting it, a setting for setting a plurality of instruction contents for one communication instruction parameter Since the means is provided, all the capabilities of the transmission side can be notified to the reception side. Therefore, even if the receiving side has a lower capability than the transmitting side and does not have the ability to interpret some parameters, by selecting the highest interpretable capability, transmission that matches the capability of the receiving side device can be performed. There is an effect that it becomes possible.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration example of a facsimile apparatus according to the present invention.
FIG. 2 is a procedure diagram 1 illustrating an example of a transition procedure to a shortening procedure.
FIG. 3 is a procedure diagram 2 showing an example of a procedure for shifting to a shortening procedure.
FIG. 4 is a flowchart showing processing for setting speed information in the NSS.
FIG. 5 is an explanatory diagram showing a format example of a high-speed NSS signal according to the present invention.
FIG. 6 is a flowchart showing a process for setting the resolution in the NSS.
FIG. 7 is an explanatory diagram showing a second embodiment of the NSS format of the present invention.
FIG. 8 is a flowchart 1 showing processing on the transmission side.
FIG. 9 is a flowchart 2 showing processing on the transmission side.
FIG. 10 is a flowchart 3 showing processing on the transmission side.
FIG. 11 is a flowchart 4 showing processing on the transmission side.
FIG. 12 is a flowchart 5 showing processing on the transmission side.
FIG. 13 is a flowchart 1 showing processing on the reception side.
FIG. 14 is a flowchart 2 showing processing on the reception side.
FIG. 15 is a flowchart 3 showing processing on the reception side.
FIG. 16 is a flowchart 4 showing processing on the reception side.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... CPU, 2 ... RAM, 3 ... Operation display apparatus, 4 ... Reading apparatus, 5 ... Printing apparatus, 6 ... Image processing apparatus, 7 ... Image storage apparatus, 8 ... ROM, 9 ... Communication control part 1, 10 ... Communication Control unit 2, 11 ... Digital network control device, 12 ... Modem, 13 ... Analog network control device, 14 ... System bus, 15 ... Line switching control device

Claims (3)

In a communication apparatus having means for transmitting a communication instruction parameter including a communication speed or resolution as a command,
A communication apparatus comprising setting means for setting, as instruction contents , a plurality of communication capabilities of the own apparatus for one communication instruction parameter. In a communication apparatus having means for transmitting a communication instruction parameter including a communication speed by setting a command,
A setting means for setting, as instruction contents, a plurality of communication capabilities of the own apparatus for one communication instruction parameter;
The command for setting the communication instruction parameter has an independent setting area for each communication speed or communication standard,
The setting means, characterized in that independently of the instruction parameters of the plurality of communication speed for each transmission speed is set to the command communication device. In a communication apparatus having means for transmitting a communication instruction parameter including resolution as a command,
A setting means for setting, as instruction contents, a plurality of communication capabilities of the own apparatus for one communication instruction parameter;
The command for setting the communication instruction parameter has an independent setting area for each resolution,
The setting means, communication device you characterized in that independently of the instruction parameters of the plurality of resolutions for each resolution is set to the command.

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