JP2949097B2 - Group 3 facsimile machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a group 3 facsimile apparatus capable of reducing the time required for a pre-transmission procedure.

[0002]

2. Description of the Related Art In general, a group 3 facsimile apparatus negotiates a transmission function to be used in image information transmission before actually starting transmission of image information.

Thus, image information can be transmitted by selecting functions that can be used in common between apparatuses of different models.

[0004] Such a pre-transmission procedure is based on CCIT.
Recommendation T.T (International Telegraph and Telephone Advisory Committee) 30.

[0005]

In recent years, the time required for transmitting image information has been shortened with the progress of the technology of each element of the group 3 facsimile apparatus. Therefore, the weight of the time required for the pre-transmission procedure in the image information transmission time between the group 3 facsimile apparatuses has become considerably large.

[0006] The present invention has been made in view of such circumstances, and a group 3 which can reduce the image information transmission time.
It is intended to provide a facsimile machine.

[0007]

According to the present invention, there is provided a storage means for storing, for each destination, the contents of an information field of a non-standard function identification signal and frame check sequence information arranged in the signal frame; The transmission function to be used is determined based on the content of the information field of the non-standard function identification signal stored in the storage means for the specified destination, and information of the non-standard function setting signal for notifying the destination of the determined content. Control means for adding the contents of the frame check sequence information stored in the storage means for the destination to the field and transmitting the same.

For each destination, storage means for storing the contents of the information field of the non-standard function identification signal and the frame check sequence information arranged in the signal frame; When the content of the frame check sequence information included in the information field matches the content of the frame check sequence information of the non-standard function identification signal frame transmitted by the own terminal, the transmission function is performed based on the received non-standard function setting signal. Is provided.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described in detail.

FIG. 1 shows a group 3 facsimile apparatus according to an embodiment of the present invention.

In FIG. 1, a CPU (central processing unit) 1
Is a control process of each part of the facsimile machine, and
The facsimile transmission control procedure is performed.
An M (read only memory) 2 stores a control processing program executed by the CPU 1 and various data necessary for executing the processing program. A RAM (random access memory) 3 stores , CP
The work area U1 is used to store various information unique to the group 3 facsimile apparatus.

The scanner 4 is for reading an original image at a predetermined resolution, the plotter 5 is for recording and outputting an image at a predetermined resolution, and the operation display unit 6 is a facsimile apparatus. To operate,
It consists of various operation keys and various indicators.

The encoding / decoding section 7 encodes and compresses the image signal and decodes the encoded and compressed image information into the original image signal.
This is for storing a large number of image information in a coded and compressed state.

The group 3 facsimile modem 9 performs a modulation / demodulation process for transmitting digital data using a public telephone line network which is an analog line, and the network control device 10 converts the facsimile device into a public telephone line network. It is for connecting to. Also, this network control device 10
Has an automatic transmission / reception function and a telephone 11 for talking.

These CPU1, ROM2, RAM
3, a scanner 4, a plotter 5, an operation display unit 6, an encoding / decoding unit 7, an image storage device 8, a group 3 facsimile modem 9, and a network control device 10.
The exchange of data between these elements is mainly performed through the system bus 12.

Data exchange between the network controller 10 and the group 3 facsimile modem 9 is directly performed.

In the group 3 facsimile apparatus, destination management information as shown in FIG. 2 is formed and stored for each destination having a function of a shortening procedure described later.

The destination management information includes telephone number information TEL indicating a telephone number of the destination, NSF field information FFN indicating information of a field of a non-standard function identification signal frame to which the destination responds, and information used when transmitting image information. The modem speed history information HSS stores the set modem speed for the past m times.

FIG. 3 shows an example of the network control device 10.

In FIG. 1, the common terminals 20ac and 20bc of the two switches 20 are connected to telephone lines, respectively, and the switching connection terminals 20ab and 20bb are connected to signal lines of the telephone 11. Also, the switching connection terminal 20
aa and 20ba are connected to the primary side of the transformer 21.

The secondary side of the transformer 21 is connected to a 2-wire side connection end of a 2-wire / 4-wire converter 22.
The 4-wire connection end of the wire converter 22 is connected to the group 3 facsimile modem 9.

The ringing / reciprocity detector 23 detects a ringing tone which is a ringing tone from the exchange and detects reversal of the polarity of the DC power supply on the telephone line. Has been output.

The dial pulse generator 24 is for outputting a dial pulse as a selection signal to a line, and operates in accordance with a control signal S2 output from the CPU 1.
Is controlled by

The push button signal generator 25 is for outputting a push button signal as a selection signal to the line.
It is added to the signal input end of the line side connection end. The push button signal generator 25 is controlled by a control signal S3 output from the CPU 1.

The tone signal generator 26 is for outputting a predetermined tone signal TN1 to the line, and the output signal of the tone signal generator 26 is the signal input from the four-wire side connection terminal of the two-wire / 4-wire converter 22. Added to the edge. The tone signal generator 26 is controlled by a control signal S4 output from the CPU 1.

The tone signal detector 27 is for detecting the tone signal TN1 transmitted from the partner terminal via the line, and has an input terminal connected to the 4-wire side of the 2-wire / 4-wire converter 22. The terminal is connected to the signal output terminal. The detection signal S5 is output to the CPU 1.

The operation of the switch 20 is controlled by a control signal S6 output from the CPU 1.

With the above configuration, this group 3 facsimile apparatus, if the above-mentioned destination management information is not stored for the destination specified by the operator, will be described with reference to FIG.
A standard transmission procedure as shown in FIG. The following description is for a case where the number of transmission originals is one.

That is, when the destination telephone number and transmission conditions are specified by the operator, the transmitting device TX calls the receiving device RX (dial).

As a result, the ringing tone is transmitted from the exchange to the receiving device RX, so that the detection signal S1 is output from the ringing / reciprocity detector 23 of the network control device 10, and the ringing detection is notified to the CPU 1, whereby ,
The CPU 1 performs a switching operation of the switch 20 to switch the transformer 21.
Close the DC loop of the line on the primary side (off-hook).

As a result, in the transmitting device TX, the detection signal S1 is output from the ringing / reversion detector 23, and the reversion detection is notified to the CPU1.

When a predetermined time Ta (= approximately 2 seconds) elapses after the receiving apparatus RX goes off-hook, the receiving apparatus RX transmits a called station identification signal CED including a predetermined tone signal for a predetermined time Tb. , A digital identification signal DIS for notifying a standard function provided in the terminal itself and a non-standard function identification signal NSF for notifying a non-standard function
Is sent. Information indicating that a short procedure is provided is included in the non-standard function identification signal NSF.

The transmitting device TX analyzes the received digital identification signal DIS and the non-standard function identification signal NSF,
The device function of the receiving device RX is determined, and an available transmission function is set. Then, the setting contents are notified by the non-standard function setting signal NSS. In order to perform the modem training at the modem speed set at that time, the training is performed with the modem speed of the group 3 facsimile modem 9 set to the set speed. A check signal TCF is transmitted.

At this time, if the received non-standard function identification signal NSF includes the information indicating that there is a shortening procedure, the transmitting device TX forms the above-described destination management information with respect to the receiving device RX, and Number information TEL and N
Non-standard function identification signal NSF in SF field information FFN
Set the fields for

When the receiving state of the training check signal TCF is good, the receiving device RX responds to the receiving preparation confirmation signal CFR and shifts to the preparation for receiving image information.

The transmission device TX receives the reception preparation confirmation signal CFR.
Is received, the image of the transmitted document at that time is
The image signal obtained by the above is encoded and compressed by the encoding / decoding unit 7, and the image information PIX formed thereby is transmitted.
Procedure end signal EOP indicating that there is no subsequent page
Is sent.

The receiving device RX decodes the received image information PIX into the original image signal by the encoding / decoding unit 7, sequentially transfers the obtained image signals to the plotter 5, and records and outputs the received image. . Then, at the end of the reception of the image information PIX, if the coding / decoding unit 7 has received no more than a predetermined number of code errors and received the image information PIX normally, it responds with a message confirmation signal MCF.

The transmitting device TX transmits the message confirmation signal MC
When F is received, a disconnection command signal DCN is transmitted, the line is restored, and a series of image information transmission operations ends.

The receiving device RX is provided with a disconnection command signal DC.
When N is received, the line is restored, and a series of image information receiving operations is terminated.

Further, when destination management information relating to the destination at that time is stored, the transmitting device TX stores the modem speed used in the image information transmission in the modem speed history information H.
Add to SS.

Now, in the case where the user knows that the destination has the shortening procedure function and stores the destination management information relating to the destination, when calling the same destination, FIG. ) And (c). FIG. 2B shows a case where the line of the receiving device RX is inconsistent at the time of off-hook, and FIG.
The case where the line of the receiving device RX does not conflict when off-hook is shown.

In this case, the transmitting device TX determines whether there is a conflict after calling or whether the called station identification signal CED is detected.

When a reciprocity is detected, a non-standard device setting signal NSS for notifying the transmission function set based on the contents of the NSF field information FNN of the destination management information of the destination is transmitted immediately thereafter. Then, a training check signal TCF is transmitted.

On the other hand, when the receiving device RX receives the non-standard device setting signal NSS during a period from the time when the incoming call is answered and the time Ta for responding to the called station identification signal CED elapses, the received non-standard device RX is received. The transmission function is set based on the setting signal NSS, and the subsequent operation is performed.

Thereafter, the same transmission procedure as the above-described standard transmission procedure is executed, and the image information PIX is transmitted. Also, the transmitting device TX does not detect the reciprocity after calling,
When the non-standard device setting signal NSS is not transmitted, the called device identification signal CED is transmitted from the receiving device RX. Upon receiving the called station identification signal CED, the transmitting device TX
Immediately after the tone signal generator 26 generates the tone signal TN1 from the tone signal generator 26 for a certain short period of time and stops outputting the tone signal TN1, a non-standard device setting signal whose content is determined in the same manner as described above Send NSS.

On the other hand, in the receiving device RX, when the tone signal detector 27 detects the tone signal TN1 while transmitting the called station identification signal CED, the transmission of the called station identification signal CED is terminated at that time. Then, the process proceeds to preparation for receiving the non-standard device setting signal NSS.

Thereafter, the above-described standard transmission procedure is executed between the transmitting device TX and the receiving device RX, and the image information PIX is transmitted.

As described above, in this embodiment, when the transmitting device TX detects the incoming response of the receiving device RX, it starts the phase B of the transmission procedure, so that the time of the pre-transmission procedure is greatly reduced. And the time required for image information transmission can be reduced.

By the way, the function of the receiving device RX is changed, and the NS of the destination management information stored in the transmitting device TX is changed.
If the content of the F-field information FFN is different from the content of the non-standard function identification signal NSF transmitted by the receiving device RX, the following procedure is performed.

That is, when the receiving device RX is connected to a line that is inconsistent when off-hook, as shown in FIG. 5A, the content of the non-standard function setting signal NSS transmitted by the transmitting device TX after off-hook detection is performed. Cannot be used, the receiving device RX then responds with the digital identification signal DIS and the non-standard function identification signal NSF.

The transmitting device TX transmits the non-standard function setting signal NS
Since the training check signal TCF is transmitted after S, the identification signal NSF of the non-standard device cannot be received, and at this time, a correct response signal to the training check signal TCF is received from the receiving device RX. I can't, so I'm waiting in that state.

The receiving device RX waits for the non-standard function setting signal NSS based on the non-standard function identification signal NSF transmitted first. The signal NSF is transmitted.

When receiving the second non-standard function identification signal NSF, the transmitting device TX determines the content thereof, and when it detects that the short procedure is provided, the non-standard function identification signal NSF is used. The previous information stored in the NSF field information FFN of the corresponding destination management information is rewritten with the contents of the field of the signal NSF.

At the same time, the transmission function to be used is set based on the content of the received non-standard function identification signal NSF, and the non-standard function setting signal NSS corresponding to the set content is set.
Is sent.

After that, the above-described standard transmission procedure is executed, and the transmitting device TX transmits to the receiving device RX.
The image information PIX is transmitted.

Further, a new non-standard function identification signal NSF
If the content containing the shortened procedure is not included, the destination management information on the destination is deleted.

When the receiving device RX is connected to a line that does not conflict when off-hook, a procedure as shown in FIG.

Further, for example, the contents registered in the modem speed history information HSS of the destination management information are all V.V. If the maximum speed of the 29 modem is set to 9600 bps, the state of the line established with the destination is always good.

In such a case, 9600 bp
Since a modem speed of s can be used, a modem speed of 9600 bps can be set with the destination even if the modem training procedure using the training check signal TCF is omitted.

Therefore, as shown in FIGS. 6 (a) and 6 (b), for a destination in which such destination management information is stored, the transmitting device TX uses a non-standard function setting signal NSS to perform modem training. Notifying that the procedure is not performed, the receiving device RX responds with a reception preparation confirmation signal CFR indicating that the procedure can be accepted, and uses a procedure of starting transmission of the image information PIX immediately after that.

FIG. 7A shows a case where the receiving device RX is connected to a line which is inconsistent when off-hook, and FIG. 7B shows a case where the receiving device RX is connected to a line which is not inconsistent when off-hook. Shows the case.

Thus, the time required for the pre-transmission procedure can be further reduced, and the image information transmission time can be greatly reduced.

When the transmitting apparatus TX sets the transmission function to be used with reference to the contents of the NSF field information FFN of the destination management information, if the contents of the underlying NSF field information FFN are different, the receiving apparatus TX Device RX
May not be able to use the function specified by the non-standard function setting signal NSS.

To avoid such a situation, for example, by adding the content of NSF field information FFN to the non-standard function setting signal NSS, the transmission function set by the non-standard function setting signal NSS is set. May be transmitted from the transmitting device TX to the receiving device RX.

As a result, the receiving device RX refers to the NSF field information FFN included in the non-standard function setting signal NSS and, based on the non-standard function identification information NSF, It is determined whether it is the same as the non-standard function identification information NSF used.

By making this determination, the transmitting device TX
Can clearly recognize the information that is the basis of the non-standard function setting signal NSS transmitted by the device, and can surely determine whether image information can be transmitted with the transmitting device TX.

However, the function of the group 3 facsimile apparatus tends to increase, and accordingly, the content to be notified by the non-standard function identification signal NSF tends to increase. The transmission time of the NSF field information FFN is determined, and the burden on the receiving device RX for determining the NSF field information FFN is increased.

Therefore, such inconvenience can be solved.
Next, another embodiment according to the present invention will be described.

First, a procedure signal such as the non-standard function identification signal NSF is carried by a data frame conforming to the HDLC (High Level Data Link / Control) procedure, an example of which is shown in FIG.

That is, this data frame includes a flag sequence F composed of a predetermined bit pattern, an address field A, a control field C, an information field I, a frame check sequence FCS,
The flag sequence F is arranged in this order.

In the information field I, identification information assigned to the procedure signal and, when the procedure signal has an information field, the information field are arranged.

The frame check sequence FCS
Is composed of 16-bit CRC (Cyclic Redundancy Code) data obtained by converting a data sequence from the first bit of the address field A to the last bit of the information field I using a predetermined generator polynomial. The terminal device that has made the determination by referring to the frame check sequence FCS determines whether or not the content of the received data frame includes a data error.

Considering the frame check sequence FCS, for example, the non-standard function identification signal NSF
Then, if the content of the information field is different, the content is always different.

That is, for each non-standard function identification signal NSF, one frame check sequence F
CS will respond.

Therefore, as shown in FIG. 8, the contents of the frame check sequence FCS arranged in the data frame of the non-standard function setting signal NSF are stored in the learning information LRN.
To the destination management information.

Then, the transmitting device TX adds the content of the learning information LRN to the information field of the non-standard function setting signal NSS and transmits the information (see FIG. 7B).

In the receiving device RX, the non-standard function setting signal N
When the SS is received, the learning information LRN included in the SS is received.
Is the non-standard function identification signal NSF sent by the terminal itself.
Is determined to be the same as the frame check sequence FCS included in the data frame, and if it is determined to be the same, the shortening procedure described above is executed.

As a result, the length of the non-standard function setting signal NSS is shortened, the transmission time is shortened, and the load of the determination process performed by the receiving device RX is reduced.

FIG. 9 shows a processing example at the time of transmission. Note that, in this processing example, details other than the part of the pre-transmission procedure directly related to the present invention are omitted.

First, when the operator performs an operation for transmission preparation, a process for a transmission operation is performed until a start key (not shown) or the like of the operation display unit 6 is operated to input a command to start transmission (processing). 101, NO loop of decision 102).

When transmission is instructed and the result of determination 102 is YES, it is checked whether destination management information having the same telephone number information TEL as the telephone number of the destination specified at that time is stored. It is checked whether the destination is already registered (decision 104).

When the result of determination 104 is YES, the above-described shortening procedure is performed.

That is, a destination is called (step 10
4) Wait until the called station identification signal CED is transmitted from the destination or the network control device 10 detects a reciprocity (NO loop of determinations 105 and 106).

Detecting the called station identification signal CED and determining 1
When the result of step 05 becomes YES, the tone signal TN1 is transmitted from the network controller 10 (step 106). The contents of the modem speed history information HSS in the destination management information of the destination are checked (step 108).

At this time, if the contents of the modem speed history information HSS are all the same speed (decision 109
Is YES), it is checked whether the speed is 9600 bps (judgment 110), and the result of the judgment 110 is YE
When S, the modem training procedure is set to be omitted (process 111), and the transmission function to be used is determined by referring to the NSF field information FFN stored in the destination management information. A non-standard function setting signal NSS for setting is formed and transmitted (process 112). At this time, if the destination management information includes the learning information LRN, the learning information LR is used.
N is added to the information field of the non-standard function setting signal NSS. The same applies to the contents of the non-standard function setting signal NSS.

When the result of determination 110 is NO,
Since there is a possibility that a modem speed of 9600 bps can be used, the modem speed is set to 9600 bps, the transmission function to be used is determined by referring to the NSF field information FFN stored in the destination management information, and the transmission function is determined. A non-standard function setting signal NSS for setting is formed and transmitted (process 113), and a modem training procedure is executed (process 114).

Further, the contents of the modem speed history information HSS are not all the same, and the result of the judgment 109 is NO.
, The modem speed that is the highest among the elements of the modem speed history information HSS is selected and set to the modem speed to be used (process 115), and the NSF field information stored in the destination management information is processed. The transmission function to be used is determined with reference to the FFN, a non-standard function setting signal NSS for setting the transmission function is formed and transmitted (process 116), and the modem training procedure is executed (process 117).

When the pre-transmission procedure is performed as described above, it is determined whether a predetermined response signal has been received from the receiving device RX at that time (decision 118), and the result of the decision 118 is Y
When it becomes ES, the transmission image information at that time is transmitted (step 119), and the post-transmission procedure is executed (step 12).
0).

Then, the modem speed history information HSS is updated with the modem speed used at that time (process 121), the line is restored (process 122), and a series of transmission operations is completed.

In the process 121, if there is an empty area in the modem speed history information HSS, the modem speed information is newly registered at the head of the empty area. The content of the first item of the history information HSS is changed to the content of the modem speed information to be registered.

On the other hand, if the destination management information of the specified destination is not registered and the result of the judgment 103 is NO,
Perform the normal procedure.

That is, the destination designated at that time is called (step 123), and the digital identification signal DIS and the non-standard function identification signal NSF sent from the receiving device RX are sent.
Is received (process 124).

Then, the received non-standard function identification signal NS
It is checked whether or not F includes information indicating that there is a shortened procedure (decision 125). If the result of decision 125 is YES, a destination management table is newly formed (process 12).
6), telephone number information TEL, NSF field information FF
N and learning information LRN when there is learning information LRN
Is stored in the newly formed destination management table (process 1).
27).

Then, the NSF field information FFN
The transmission function is set on the basis of the contents of step (1), the process proceeds to step 113, and the subsequent processes are executed.

If the destination does not have a shortening procedure and the result of determination 125 is NO, the transmission function to be used is determined by referring to the contents of the information field of the non-standard function identification signal NSF, A non-standard function setting signal NSS for setting the transmission function is formed and transmitted (process 128), and the modem training procedure is executed (process 1).
29).

Then, the transmission image information at that time is transmitted (step 130), and the post-transmission procedure is executed (step 131).
After the line is restored (process 132), a series of transmission operations ends.

During execution of the shortening procedure, if a response signal to be received in the pre-transmission procedure cannot be received and the result of determination 118 is NO, the process shifts to step 124 to execute the subsequent procedure processing. I do.

FIG. 10 shows an example of processing at the time of reception.

First, it is monitored that an incoming call is detected (NO loop in decision 201).
0 and the result of decision 201 is YES,
Until the time Ta elapses, the non-standard function setting signal NS
It is monitored whether or not S is received (decisions 202 and 203).
NO loop).

If the non-standard function setting signal NSS is transmitted from the transmitting device TX until the time Ta elapses, and the result of the determination 202 is YES, the shortening procedure is executed. That is, first, the contents of the non-standard function setting signal NSS are analyzed (step 204), and it is determined whether the set transmission function matches the function that can be used by the terminal itself (step 205). At this time, when it is notified that the learning information LRN is added, the contents of the learning information LRN and the frame check sequence FCS included in the data frame of the non-standard function identification signal NSF transmitted by the terminal itself are provided. Check if are the same.

If the result of decision 205 is YES, it is checked whether or not the setting for not performing the modem training procedure is made (decision 206). If the result of decision 206 is YES, a reception preparation confirmation signal CFR is returned. Then, if the result of the determination 206 is NO, a predetermined modem training procedure is performed (process 208). In this way, when reception preparation is completed, predetermined image information reception processing is performed to receive image information (step 20).
9) When the image information reception ends, the post-transmission procedure is executed (process 210), the line is restored (process 211), and a series of image information reception operations ends.

On the other hand, even if the time Ta has elapsed since the detection of the incoming call, the non-standard function setting signal NSS is not received, and if the result of the judgment 203 is YES, the called station identification signal CED is transmitted. Meanwhile, it is monitored whether or not the tone signal TN1 is detected before the transmission time Tb elapses (step 212, NO loop of the determinations 213 and 214).

Here, before the transmission time Tb of the called station identification signal CED elapses, the tone signal TN1 is detected, and when the result of the judgment 214 becomes YES, the shortening procedure is executed. After receiving the non-standard function setting signal NSS transmitted from the transmitting device TX (Step 21)
5) The process shifts to the process 204 to execute the subsequent processes.

Also, the transmission time T of the called station identification signal CED
If the result of the determination 213 is YES without detecting the tone signal TN1 before the time elapses, the digital identification signal DIS and the non-standard function identification signal NSF are transmitted in the same manner as in the normal transmission procedure. After processing (processing 21
6) Receive the non-standard function setting signal NSS (or digital command signal DCS) sent from the transmitting device TX, determine the transmission function to be used at that time (process 217), and execute the modem training procedure (step 217). Processing 218) and processing proceed to 209, where image information is received using the transmission function set at that time.

In the above description, when the image information is transmitted using the shortening procedure, when the modem speed is set, the modem speed stored most in the modem speed history information HSS of the destination management information is set. However, other setting methods can be used.

Further, the destination management information may include contents other than those of the above-described embodiment.

[0107]

As described above, according to the present invention,
For each destination, the modem speed history storage means for storing the history of the used modem speed, and at the time of transmission, read the modem speed history for the specified destination from the modem speed history storage means, and Control means for judging the modem speed to be used based on the history and judging whether or not to execute the modem training procedure and notifying the receiving device of the judgment is provided, so that the optimum modem speed for each destination is provided. The modem training procedure can be performed in a state where is determined, and an unnecessary downshift of the modem speed does not occur, whereby the time required for the pre-transmission procedure can be shortened.

For each destination, the contents of the information field of the non-standard function identification signal frame and the frame check sequence information are stored, and upon calling, based on the stored contents before receiving the non-standard function identification signal. In addition to setting the transmission function to be used, the frame check sequence information is added to form a non-standard function setting signal, which is transmitted, so that the time for exchanging the non-standard function identification signal can be reduced, As a result, the effect that the time of the pre-transmission procedure can be shortened is also obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a group 3 facsimile apparatus according to one embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of destination management information.

FIG. 3 is a block diagram illustrating an example of a network control device.

FIG. 4 is a time chart exemplifying a normal procedure, a shortening procedure when the receiving apparatus is connected to a line that is inconsistent when off-hook, and a shortening procedure when the receiving apparatus is connected to a line that is not inconsistent when off-hook.

FIG. 5 shows a procedure for shifting from the shortened procedure to the normal procedure when the receiving apparatus is connected to a line that is inconsistent when off-hook, and a procedure from the shortened procedure when the receiving apparatus is connected to a line that is not inconsistent when off-hook. The time chart which illustrated each procedure to shift to.

FIG. 6 illustrates a procedure for omitting a modem training procedure when the receiving apparatus is connected to a line that is inconsistent when off-hook, and a procedure for omitting the modem training procedure when the receiving apparatus is connected to a line that is not inconsistent when off-hook. FIG.

FIG. 7 is a schematic diagram illustrating an example of a non-standard function identification signal NSF and a non-standard function setting signal NSS.

FIG. 8 is a schematic diagram showing another example of the destination management information.

FIG. 9 is a flowchart illustrating a processing example at the time of transmission.

FIG. 10 is a flowchart illustrating a processing example at the time of reception.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 CPU (central processing unit) 2 ROM (read only memory) 3 RAM (random access memory) 10 network controller 20 switch 23 ringing / reciprocity detector 26 tone signal generator 27 tone signal detector

Claims (2)

(57) [Claims] 1. A storage means for storing, for each destination, the contents of an information field of a non-standard function identification signal and frame check sequence information arranged in a signal frame thereof; The transmission function to be used is determined based on the contents of the information field of the non-standard function identification signal stored in the information field of the non-standard function setting signal for notifying the determined contents to the destination. A group 3 facsimile apparatus, further comprising control means for adding and transmitting the contents of the frame check sequence information stored in the means. 2. A storage means for storing, for each destination, the contents of an information field of a non-standard function identification signal and frame check sequence information arranged in the signal frame; When the content of the frame check sequence information included in the information field matches the content of the frame check sequence information of the non-standard function identification signal frame transmitted by the own terminal, the transmission function is performed based on the received non-standard function setting signal. A group 3 facsimile apparatus comprising a control means for setting