JPH10271301A - Communication terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid communication errors by preventing the repetition of digital identification signal(DIS) at a response station/CI signal transmission at a call originating station by performing communication in place of ITU-T recommendation T.30, when impossibility in the continuation of communication is judged during communication through a communication procedure based on ITU-T recommendation V.8. SOLUTION: At the call originating station where a non-standard function identification signal (NSF)/DIS signal is received without detecting the reception of deformed response tone (ANSam) signal from the response station, it is judged whether or not the response station has the communication ability of ITU-T recommendation V.8. When it is judged that the response station has the ability, it is judged whether or not the number of times of CI signal transmission in such a case has reached an upper limit value, so that possibility in the continuation of communication procedure based on the ITU-T recommendation V.8 can be judged. When it is judged that this procedure cannot be continued, communication is continued through the ordinary procedure of ITU-T recommendation T.30. Thus, even when the ANSam signal is not detected at the call originating station, no communication error occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device, and more particularly, to ITU-T Recommendation V.3. 8 and T.I. 30
The present invention relates to a communication terminal device capable of performing communication based on a communication procedure conforming to the standard.

[0002] ITU-T stands for International Te
lecommunication Union-Telecommunications Standardi
zation Sector, or Telecommunication Standardization Sector of the International Telecommunication Union.

[0003]

2. Description of the Related Art Conventionally, ITU-T has 3
2 (standard for 2-wire full duplex modems up to 9600 bps)
2880 exceeding 14400 bps
The standard of a two-wire full-duplex modem up to 0 bps is V. 34. Thereafter, the above V.I. ITU-T is a standard that applies to the communication procedures of facsimile machines.
Recommendation T. 30 ANNEXF has been established.

[0004] This ITU-T Recommendation T. In 30ANNEXF,
The answering station that has received the call is a modified answer tone (ANSam signal)
Is transmitted to the calling station for a predetermined time, and the ITU-T Recommendation V. If the communication procedure according to No. 8 is not established, a non-standard function identification signal (NSF signal) / digital identification signal (DIS signal) is transmitted to the calling station after a predetermined silence period. Note that DI
In response to the ITU-T Recommendation V.S. 8 includes information indicating whether or not there is a capability to communicate based on a communication procedure according to V.8 (hereinafter referred to as V.8 capability).

[0005] Upon receiving the DIS signal from the responding station, the calling station sends a V.V. signal to the responding station based on the DIS signal. 8 is determined, and V.8 is determined. If it is determined that the mobile station has eight capabilities, it sends a call indication signal (CI signal) to the answering station.

[0006] Upon receiving this CI signal, the responding station transmits a modified response tone (ANSam signal) to the calling station.
TU-T Recommendation V. It is determined whether communication is possible based on a communication procedure according to ITU-T Recommendation V.34. If it is determined that communication can be performed based on a communication procedure according to No. 34,
Between the calling station and the answering station, ITU-T Recommendation V. The communication shifts to communication based on a communication procedure according to No. 34.

Incidentally, according to ITU-T Recommendation V. In the communication procedure according to No. 8, the calling station has not determined whether or not communication based on the communication procedure can be continued, and determines whether the answering station can continue the communication. Deciding.
In this case, if the answering station determines that the communication cannot be continued, the ITU-T recommendation T.30. The process proceeds to the 30 binary communication procedure, and the DIS signal is transmitted again.
Note that the responding station has V. 8 capability, the retransmitted DIS signal has V.8. Information indicating that the user has eight capabilities is included.

[0008]

However, since the CI station cannot receive the CI signal for some reason (for example, the line condition is bad), the responding station is unable to receive the ITU-T Recommendation V.3. 8
If it is determined that the communication based on the communication procedure according to the above cannot be continued, the responding station transmits the DIS signal to the calling station again. The calling station that has received the DIS signal in this way sends a V.V. signal to the calling station based on the received DIS signal. If it is determined that it has eight capabilities, it transmits the CI signal to the responding station again. Therefore, this CI signal cannot be received again, and the ITU-
T Recommendation V. The responding station that has determined that the communication based on the communication procedure according to No. 8 cannot be continued transmits the DIS signal to the calling station again. Therefore, transmission of the DIS signal by the responding station and transmission of the CI signal by the calling station are repeated.

[0009] Further, the calling station transmits the ANSam from the answering station.
If it cannot receive a DIS signal, it waits for a DIS signal. 8 is determined, and V.8 is determined. If it is determined that it has eight capabilities, it sends a CI signal to the responding station. When the responding station receives the CI signal, it sends an ANSam signal.
If the calling station cannot receive the Sam signal, the
Wait for signal reception. Therefore, transmission of the DIS signal by the responding station and transmission of the CI signal by the calling station are repeated.

As described above, if the state in which the transmission of the DIS signal by the responding station and the transmission of the CI signal by the calling station continue for a predetermined time (time-up), the line is released as a communication error. Therefore, communication cannot be continued.

Further, as described above, ITU-T Recommendation V. It is determined whether communication is possible based on a communication procedure according to ITU-T Recommendation V.34. If it is determined that the communication cannot be performed based on the communication procedure according to No. 34, the above-mentioned DIS signal is transmitted from the responding station. However, this DIS
V. signal 8 includes the information indicating that it has the capability again. It is determined whether or not communication can be performed based on a communication procedure according to 34. Therefore, if this procedure is repeated and continued for a predetermined time (time-up), the line is released as a communication error. Therefore, communication cannot be continued.

[0012] The present invention has been made in view of the above facts, and is described in ITU-T Recommendation V. Communication cannot be continued based on the communication procedure in accordance with ITU-T Recommendation V.8. 8 during communication based on the communication procedure according to ITU-T Recommendation V.8. An object of the present invention is to provide a communication terminal device capable of continuing communication without causing a communication error even when it is determined that it is not possible to shift to a communication procedure conforming to No. 34.

[0013]

In order to achieve the above object, a first method is provided.
The invention of ITU-T Recommendation V. A first communication means for performing communication based on a communication procedure according to the first and second methods, and whether or not communication based on the communication procedure can be continued during communication based on the communication procedure by the first communication means. A determining means for determining, and when the determining means determines that the communication cannot be continued, I is replaced by I
TU-T Recommendation T. And a second communication means for performing communication based on a communication procedure conforming to 30.

Here, the determining means counts the number of times the call display signal has been transmitted, and determines whether or not the counted value is equal to or greater than a predetermined value until a predetermined time has elapsed since the first digital identification signal was received. It may be configured to count whether or not the deformed response tone is received and the number of times that the digital identification signal is received, and determine whether the counted value is equal to or more than a predetermined value.

The second invention is based on ITU-T Recommendation V.
And a first communication unit that communicates based on a communication procedure according to ITU-T Recommendation V.8 during communication based on the communication procedure by the first communication unit. A determination means for determining whether it is possible to shift to a communication procedure conforming to ITU-T Recommendation V.34. If it is determined that it is not possible to shift to the communication procedure according to ITU-T Rec.
-T Recommendation T. And a second communication means for performing communication based on a communication procedure conforming to 30.

Further, the third invention is based on ITU-T Recommendation V.
Communication means for communicating based on a communication procedure according to 8, and determination means for determining whether communication based on the communication procedure can be continued during communication based on the communication procedure by the communication means, When the determination unit determines that the communication cannot be continued, a transmission unit that transmits information indicating that communication cannot be performed in the communication procedure is provided.

Here, the determining means counts the number of times the call indication signal is received, and determines whether the count value is equal to or greater than a predetermined value, and determines whether the count value is equal to or greater than a predetermined time from when the first modified response tone is transmitted. It may be configured to count whether or not the calling menu signal has been received and the number of times that the digital identification signal has been transmitted, and determine whether one of the counted values is equal to or greater than a predetermined value.

The fourth invention is based on ITU-T Recommendation V.
Communication means for performing communication based on a communication procedure according to the communication method described above, and IT during communication based on the communication procedure by the communication means.
U.T. Recommendation V. Determining means for determining whether or not it is possible to shift to a communication procedure in accordance with ITU-T
Recommendation V. When it is determined that it is not possible to shift to the communication procedure conforming to the communication procedure, transmission means for transmitting information indicating that communication cannot be performed in the communication procedure is provided.

That is, the first communication means according to the first invention is based on ITU-T Recommendation V.3. The communication is performed based on the communication procedure according to No. 8. In addition, a transmission means for transmitting a calling signal is provided,
The first communication means, when the calling signal is transmitted by the transmission means, transmits the ITU-T Recommendation V.3. The communication may be performed based on a communication procedure according to No. 8.

The determining means determines whether the communication based on the communication procedure can be continued during the communication based on the communication procedure by the first communication means. The determining means counts the number of times the call display signal has been transmitted, and determines whether or not the counted value has reached a predetermined value or more, and receives a deformed response tone until a predetermined time has elapsed since the first digital identification signal was received. The number of times the digital identification signal has been received and the number of times the digital identification signal has been received are counted, and it is determined whether or not the counted value has reached a predetermined value or more. In this case, if the result of this determination is affirmative, it is determined that communication based on the communication procedure cannot be continued, and if the result of this determination is negative, communication based on the communication procedure can be continued. to decide.

When the determining means determines that the communication cannot be continued, the second communication means replaces the communication means with the ITU-T Recommendation T.2. Communication is performed based on a communication procedure conforming to No. 30.

As described above, ITU-T Recommendation V. If it is determined that this communication cannot be continued during communication based on the communication procedure according to ITU-T Recommendation V.8. 8 instead of the communication procedure according to ITU-T Recommendation T.8. Communication is performed based on a communication procedure conforming to No. 30. In this case, the ITU-T Recommendation T. In a communication procedure according to ITU-T Recommendation V.30,
V.8, which is specific to a communication procedure according to 8 does not send out a CI signal when a DIS signal containing information indicating that it has the capability is transmitted from the responding station.
No m signal is sent. Therefore, it is possible to prevent the transmission of the DIS signal by the responding station and the transmission of the CI signal by the calling station to be repeated, without causing a communication error, and without causing a communication error. The communication based on the communication procedure according to No. 30 can be continued.

[0023] The first communication means according to the second invention is the IT communication means.
U.T. Recommendation V. The communication is performed based on the communication procedure according to No. 8. During the communication based on the above-mentioned communication procedure by the first communication means, the judging means determines whether the ITU-T Recommendation V. Then, it is determined whether or not it is possible to shift to the communication procedure according to No. 34.

The second communication means is an ITU by the judging means.
-T Recommendation V. If it is determined that it is not possible to shift to a communication procedure according to ITU-T Recommendation T.34, the above communication means is replaced. Communication is performed based on a communication procedure conforming to No. 30.

As described above, ITU-T Recommendation V. 8 during communication based on a communication procedure according to ITU-T Recommendation V.8. 34
If it is determined that it is not possible to transition to a communication procedure that complies with
Instead of the above communication means, ITU-T Recommendation T. Since communication is performed based on a communication procedure conforming to V.30, V.30. 8 even if a DIS signal containing information indicating that the
U.T. Recommendation T. The communication procedure according to ITU-T 30
Recommendation V. Since it is not determined again whether or not it is possible to shift to the communication procedure according to the ITU-T Recommendation T.34, it is possible to prevent a repetition stage of the determination and to prevent a communication error. Communication can be continued according to a communication procedure according to No. 30.

Further, the communication means according to the third invention is characterized in that the communication means is IT
U.T. Recommendation V. The communication is performed based on the communication procedure according to No. 8. It should be noted that the communication means includes an detecting means for detecting the incoming call, and the communication means detects the incoming call when the detecting means detects the incoming call.
-T Recommendation V. The communication may be performed based on a communication procedure according to No. 8.

The determining means determines whether the communication based on the communication procedure can be continued during the communication based on the communication procedure by the communication means. The determining means counts the number of times the call display signal is received, and determines whether the count value is equal to or greater than a predetermined value, and receives the call menu signal until a predetermined time has elapsed since the transmission of the first modified response tone. Then, the number of times of transmitting the digital identification signal is counted, and it is determined whether or not the counted value is equal to or more than a predetermined value. In this case, if the result of this determination is affirmative, it is determined that communication based on the above communication procedure cannot be continued,
If the result of this determination is negative, it is determined that communication based on the above communication procedure can be continued.

When the determining means determines that the communication cannot be continued, the transmitting means transmits information indicating that the communication cannot be performed in the above-described communication procedure.

As described above, ITU-T Recommendation V. If it is determined that the communication based on the communication procedure cannot be continued during the communication based on the communication procedure based on No. 8, information indicating that communication cannot be performed according to the communication procedure is transmitted. In this case, the calling station sends the responding station V.V. Since the calling station does not have the capability, no CI signal is transmitted from the calling station. Therefore, it is possible to prevent the transmission of the DIS signal by the responding station and the transmission of the CI signal by the calling station, which are caused by the receiving station not receiving the CI signal, so that the ITU-T Recommendation T. Communication can be continued according to a communication procedure according to No. 30.

The communication means according to the fourth invention is an ITU-T communication means.
Recommendation V. The communication is performed based on the communication procedure according to No. 8. The determining means determines whether or not the communication is performed by the communication means based on the communication procedure. It is determined whether or not it is possible to shift to a communication procedure in accordance with ITU-T Rec.
-T Recommendation V. If it is determined that it is not possible to shift to the communication procedure conforming to No. 34, information indicating that communication cannot be performed in the above communication procedure is transmitted.

As described above, ITU-T Recommendation V. 8 during communication based on a communication procedure according to ITU-T Recommendation V.8. 3
If it is determined that it is not possible to shift to the communication procedure conforming to ITU-T Recommendation V.4, it is determined that the communication procedure cannot be performed. Communication based on the communication procedure according to No. 8 is not performed. Therefore, ITU-T
Recommendation V. Since it is not determined again whether or not it is possible to shift to the communication procedure conforming to the ITU-T Recommendation T.34, it is possible to prevent the determination from being repeated and without causing a communication error. Communication can be continued according to a communication procedure according to No. 30.

In this specification, the following various signals including the above-mentioned signals are represented by corresponding abbreviations.

[0033]

[Table 1]

Further, among the above signals, ITU-T Recommendation V. 8 will be described.

The modified response tone (ANSam signal) is a cosine signal of 2100 Hz subjected to amplitude modulation. More specifically, the cosine waveform signal of 2100 ± 1 Hz is 450
The phase is inverted at an interval of ± 25 milliseconds, and a further 15 ± 0.
The amplitude is modulated by a cosine waveform of 1 Hz. The amplitude of the envelope of the modulated waveform should have a long-term average amplitude in the range of (0.8 ± 0.01) to (1.2 ± 0.01).

The calling menu signal (CM signal) is a signal transmitted from the communication terminal device (calling station) on the calling side.
Used primarily to indicate the modulation scheme available at the calling station. This CM signal is in accordance with Recommendation V. 21 defined in the low-frequency channel V.21. 300 bp modulated by 21 (L)
s is repeated. More specifically, one CM signal is composed of ten “1s” followed by one “1”.
Beginning with a 0-bit synchronization code, in the first information category in the CM signal, the desired calling function is displayed according to a predetermined calling function category. In addition, the CM signal must include one or more octets indicating the modulation modes available at the calling station.

The common menu signal (JM signal) is a signal transmitted from the called communication terminal device (response station).
It is mainly used to indicate the modulation scheme that can be commonly used by the calling station and the answering station. This JM signal is described in Recommendation V.
21 defined in the high-frequency channel V.21. It is composed of a repetitive bit string of 300 bps modulated by 21 (H). More specifically, one JM signal starts with ten "1s" followed by a 10-bit synchronization code,
In the first information category in the JM signal, the received CM
The same calling function as the signal is displayed. However, if the calling function is unavailable at the answering station, a different calling function may be displayed in the JM signal. Also, the JM signal is C
An octet indicating all the modulation modes available in the answering station among the modulation modes used in connection with the calling function indicated by the CM signal while being the modulation mode indicated by the M signal. Have to be there.

The CM terminator (CJ signal) is a signal indicating confirmation of detection of the JM signal and termination of the CM signal. This CJ signal has a V.P. of 300 bps. It is modulated by 21 (L) and is composed of three consecutive "0" octets including a start bit and a stop bit.

The call indicating signal (CI signal) is a signal transmitted from the calling station to indicate a general communication function, and is transmitted from the calling station at regular ON / OFF intervals. The on-period must include at least three or more CI signals and have a duration of no more than 2.0 seconds. The off period must be between 0.4 seconds and 2.0 seconds in duration. One CI signal is composed of ten "1" s, followed by a 10-bit synchronization code, and a calling function octet. The signal in the ON period is described in Recommendation V. 21 defined in the low-frequency channel V.21. 30 modulated by 21 (L)
It is composed of a repeating bit string of 0 bps.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

[Overall Configuration of Facsimile Apparatus] FIG. 1 shows an overall configuration diagram of a facsimile apparatus 10 as an example of a communication terminal apparatus according to the present invention. The facsimile machine 10 includes a CPU 12 for controlling the entire facsimile machine 10, a RAM 14 as a work area used when executing a control program, an operation display device 16 provided with a display and operation switches for operating the facsimile machine 10, A reading device 18 for reading a transmission original, a printing device 20 for printing and outputting received image information and the like, encoding / decoding /
An image processing device 22 for performing image processing such as enlargement / reduction, an image storage device 24 for storing image information to be transmitted or received, and a system control program including a ROM storing a program for controlling the entire facsimile device 10 A storage unit 28, a digital communication control program storage unit 30 including a ROM storing a program for controlling communication (for example, G4) suitable for a digital network (for example, an ISDN network), and an analog network (for example, G3) An analog communication control program storage unit 32 composed of a ROM storing a program for controlling communication suitable for
A digital network controller 38 for connecting the facsimile machine 10 to a digital network, an analog network controller 40 for connecting the facsimile machine 10 to an analog network, and a plurality of external line interfaces and a plurality of internal communication circuits by switching. Line switching control device 3 for connection
6 which are interconnected by a system bus 26.

The digital communication control program storage unit 30 is interconnected with the direct line switching control unit 36, and the analog communication control program storage unit 32 is a modem (modem / demodulation device) having a low-speed mode and a high-speed mode. 3
4 and is mutually connected to the line switching control device 36. Further, the line switching control device 36 is mutually connected to each of the digital network control device 38 and the analog network control device 40.

The facsimile apparatus 10 of this embodiment can be connected to either a digital network or an analog network. However, when the facsimile apparatus 10 is connected only to an analog network, the digital communication control program storage unit 30 and the digital network The control device 38 can be omitted, and when only the digital network is connected, the analog communication control program storage section 32, the modem 34, and the analog network control device 40 can be omitted.

[ITU-T Recommendation T. Overview of Basic Communication Procedure of ANNEXF] Next, ITU-T Recommendation T.30 30 A
An outline of a basic communication procedure of NNEXF will be described. FIG. 30 shows a basic communication procedure of ANNEXF, in which a signal transmitted from the calling station to the answering station is on the left side of the center line, and a signal transmitted from the answering station to the calling station is on the right side of the center line. Are shown in chronological order from top to bottom.

FIG. 2 covers a procedure at the start of communication, a procedure at the time of transmitting image information, and a procedure at the end of communication. Among these, the procedure at the start of communication includes network interaction (phase 1) for recognizing the functions and the like of the partner terminal, and a line for grasping the state of the communication line set between the calling station and the answering station. Probing (Phase 2), Primary channel equalizer training (Phase 3) for training the equalizer built in the modem, Modem parameter exchange (Phase 2) for exchanging the performance information of the modem and setting the data signal speed T.4), for exchanging control channel data before transmitting image information. 30 facsimile handshake (phase 5),
Prior to the transmission of the image information, the primary channel is resynchronized. The primary channel is resynchronized (phase 6).

In the network interaction, ITU-T Recommendation V. Communication based on a communication procedure conforming to V.8 (hereinafter referred to as a V.8 communication procedure) is performed, and after the next line probing, V.8 communication is performed. The operation based on the 34 half-duplex operation mode is performed.

[ITU-T Recommendation T. Outline of Binary Communication Procedure] ITU-T Recommendation T.30 Since the 30 binary communication procedure is well known and will not be described in detail, as shown in FIG.
A low-speed (for example, 300 bps) NSF / DIS signal is transmitted to the calling station. As shown in FIG. 4, the DIS signal includes a preamble, a flag F, an address field A, a control field C, a facsimile control field FCF, a facsimile information field FIF,
Frame checking sequence FCS and flag F
It consists of. In addition, the third bit of the first byte of the facsimile information field FIF is transmitted to the responding station by the V.100. 8
0 if not capable; If there are 8 abilities, 1 is set. Therefore, the calling station that has received the DIS signal determines whether the third bit of the first byte of the facsimile information field FIF of the DIS signal is 1 or 0, and notifies the responding station of V.0. It is possible to determine whether or not the user has eight capabilities.

Here, the basic communication procedure of the network interaction (phase 1) will be described in detail with reference to FIGS.

Facsimile apparatus (calling station) according to this embodiment
In step 52 of FIG. 5, a dial tone (call signal) is transmitted (see Calling of FIG. 6). When dialing is completed (step 54; Y), steps 56 and 58 are performed.
Then, it waits for reception of the ANSam signal and the NSF signal / DIS signal.

If it is determined in step 56 that the ANSam signal has been received, the process proceeds to step 80 in which a normal ITU-T Recommendation V. 8 Continue the communication procedure.

If it is determined in step 58 that the NSF signal / DIS signal has been received,
A CI sending counter for counting the number of times the signal has been sent is set to 0. 8. Determine if you have the ability. The response station has 8 If it is determined that there is no ability, step 8
2, the standard ITU-T Recommendation T.2 Perform 30 procedures.

On the other hand, at step 62, the responding station sends the If it is determined that there are eight capabilities, it is determined in step 64 whether or not the value of the CI transmission counter has reached the upper limit of the number of times of transmitting the CI signal. The value of the CI transmission counter is CI
If it is determined that the upper limit of the number of times of signal transmission has been reached, in step 82, a DCS command of 300 bps is transmitted, and the normal ITU-T Recommendation T.30 is transmitted. Perform 30 procedures.

On the other hand, if it is determined that the value of the CI transmission counter has not reached the upper limit of the number of times of transmitting the CI signal, the CI signal is transmitted at step 66, and
At step 8, the CI sending counter is incremented by one, and at step 70, it is determined whether or not the ANSam signal has been received.

In steps 70 and 72, the ANSam signal
The process waits for reception of the NSF signal / DIS signal. Step 7
If it is determined in step 2 that the NSF signal / DIS signal has not been received, the process returns to step 66, and the above processing (steps 66 to 72) is repeated.

If it is determined in step 70 that the ANSam signal has been received from the responding station, the process proceeds to step 80 where normal ITU-T Recommendation V.10 is used. 8 Continue the communication procedure.

In step 72, the NSF signal /
If it is determined that the DIS signal has been received, step 6
2 and the above processing (steps 62 to 7)
Repeat 2).

Next, the normal ITU-T Recommendation V. The continuation of the eight communication procedure will be described with reference to FIG.
As described above, when the ANSam signal is received, the communication capability information of the calling station (for example, V.34 procedure is transmitted to the responding station. This C
The M signal is transmitted a plurality of times up to a predetermined T1 time until a CJ signal described later is transmitted.

After starting the transmission of the CM signal, step 20 is executed.
At 6, the calling station sends a JM signal following the ANSam signal from the answering station.
Receive the signal. The JM signal includes information on the communication capability that can be executed by the response station among the communication capabilities represented by the CM signal, and is transmitted from the response station a plurality of times. By receiving the JM signal, the calling station can recognize a common communication capability between the calling station and the answering station.

When the calling station receives the same JM signal two or more times (step 206; Y), at step 208
A CJ signal indicating the end of the M signal is sent to the responding station. Here, after transmitting the CJ signal by 3 octets (step 210; Y), the calling station follows the silent period of 75 ± 5 milliseconds (step 212), and then in step 214, the V.V.
The process proceeds to the execution phase of 34 procedures (phase after the line probing (phase 2)).

On the other hand, V. After receiving the call (step 302 in FIG. 8), the responding station having eight capabilities transmits an ANSam signal to the calling station (step 306), following a silent period of at least 200 milliseconds (step 304). However, at this point, the T.D. CED signal, preamble, low speed (eg 300 bps) NS according to 30 binary procedure
In some cases, an F / DIS signal is sent to the calling station.

Thereafter, reception of a CM signal or a CI signal from the calling station is waited for (steps 308 and 220). When the responding station receives the same CM signal two or more times (Yes in step 310), it sends a JM signal to the responding station (step 312). The JM signal is transmitted a plurality of times, with a predetermined T1 time as an upper limit, until a CJ signal described later is received by 3 octets.

After starting the transmission of the JM signal, the responding station waits for the reception of the CJ signal following the CM signal from the calling station (step 314). Here, when the CJ signal is received by 3 octets (Yes at step 314), the responding station sets the 75
Following a silence period of ± 5 ms (step 316),
V. Move to execution phase of 34 procedure (phase after line probing (phase 2)) (step 31)
8).

In steps 308 and 220,
If neither the CM signal nor the CI signal can be received within a predetermined time (for example, the allowable ANSam signal transmission time Tr seconds (specifically, 5 ± 1 seconds)) (that is, if the result of step 324 is YES), T . The process proceeds to the 30 binary procedure (step 326).

However, when a CI signal is received, ANSa
m signal is transmitted again (step 322), and step 30 is executed.
Then, the process returns to waiting for the reception of the CM signal No. 8.

As described above, the calling station which cannot detect the reception of the ANSam signal and receives the NSF signal / DIS signal transmits the V.223 signal to the answering station. 8 is determined whether or not the response station has the V.8 capability. 8 is determined by determining whether or not the number of times of transmission of the CI signal to be transmitted when the capability is determined to have reached the upper limit. 8 to determine whether the communication procedure can be continued. If it is determined that the communication procedure cannot be continued, the normal ITU-T Recommendation T.8 is used. Since the communication is continued according to the T.30 procedure, even if the ANSam signal is not detected at the calling station, a communication error does not occur and the normal ITU-T Recommendation T.30 is used. Communication can be continued by 30 communication procedures.

In the above-described embodiment, the case where the calling station cannot detect the reception of the ANSam signal from the answering station has been described as an example. However, the present invention is not limited to this. Responds to the ANS from the responding station when the time is up due to failure to receive the CI signal from the calling station.
The same applies to the case where the am signal is not transmitted.

Next, a second embodiment of the present invention will be described. This embodiment has a configuration similar to that of the above-described first embodiment, and a description thereof will be omitted.

Next, the operation of the present embodiment will be described with reference to FIGS. 9 and 10. The operation of the present embodiment is substantially the same as the operation of the above-described first embodiment. Are denoted by the same reference numerals, description thereof will be omitted, and only different portions will be described.

Facsimile apparatus (calling station) according to this embodiment
10 executes the control routine shown in FIG. 9. If it is determined in step 58 that the NSF signal / DIS signal has been received from the responding station, in step 86, a CI transmission timer is started. In the next step 62, the responding station sends the V.V. If it is determined that there is eight capabilities, at step 88, it is determined whether or not the CI transmission timer matches the CI transmission upper limit time, and it is determined whether or not the timeout has occurred. If the CI transmission timer has not timed out, step 6
6, 70 and 72 are sequentially executed, and if the CI transmission timer has timed out, the routine proceeds to step 82, where 300b
ps. DCS command is transmitted, and the normal ITU-T Recommendation T. Perform 30 procedures.

As described above, as shown in FIG.
The calling station that cannot detect the reception of the Sam signal and receives the NSF signal / DIS signal transmits the V.Sam signal to the responding station. 8 is determined whether or not the response station has the V.8 capability. When it is determined that the V.8 capability is available, it is determined whether the CI transmission timer started when the DIS signal is first received has timed out. 8 to determine whether the communication procedure can be continued. If it is determined that the communication procedure cannot be continued, the normal ITU-T Recommendation T.8 is used. Since the communication is continued according to the T.30 procedure, even if the ANSam signal is not detected at the calling station, a communication error does not occur and the normal ITU-T Recommendation T.30 is used. Communication can be continued by 30 communication procedures.

In the above-described embodiment, the case where the calling station cannot detect the reception of the ANSam signal from the answering station has been described as an example. However, the present invention is not limited to this. Responds to the ANS from the responding station when the time is up due to failure to receive the CI signal from the calling station.
The same applies to the case where the am signal is not transmitted.

Next, a third embodiment of the present invention will be described. This embodiment has a configuration similar to that of the above-described first embodiment, and a description thereof will be omitted.

Next, the operation of the present embodiment will be described with reference to FIGS.
The operation of the present embodiment will be described with reference to the first embodiment.
Since the operation is substantially the same as that of the embodiment, the same portions are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described.

Facsimile apparatus (calling station) according to this embodiment
10 executes the control routine shown in FIG. 11, and if it is determined in step 54 that dialing has been completed, step 90 is executed.
Then, a DIS reception counter for counting the number of times the DIS signal is received is set to 0. Also, in step 58,
If it is determined that the NSF signal / DIS signal has been received from the responding station, at step 92, the DIS reception counter is incremented by one. Further, in step 62, the responding station sends V. If it is determined that the user has eight capabilities, step 94
Then, it is determined whether or not the DIS reception counter has reached the upper limit of the number of times of receiving the DIS signal. If it is determined that the DIS reception counter has not reached the upper limit of the number of times the DIS signal is received, steps 66, 70, and 72 are sequentially executed to set the upper limit of the number of times the DIS reception counter receives the DIS signal. If it is determined that the time has arrived, the process proceeds to step 82, where a DCS command of 300 bps is transmitted, and the normal ITU-T Recommendation T.30 is sent. Perform 30 procedures.

As described above, as shown in FIG.
By not detecting the reception of the Sam signal and determining whether the number of times of receiving the DIS signal (DIS reception counter) has reached the upper limit of the number of times of receiving the DIS signal,
V. 8 to determine whether the communication procedure can be continued. If it is determined that the communication procedure cannot be continued, the normal ITU-T Recommendation T.8 is used. Since the communication is continued according to the T.30 procedure, even if the ANSam signal is not detected at the calling station, a communication error does not occur and the normal ITU-T Recommendation T.30 is used. Communication can be continued by 30 communication procedures.

In the above-described embodiment, the case where the calling station cannot detect the reception of the ANSam signal from the answering station has been described as an example. However, the present invention is not limited to this. Responds to the ANS from the responding station when the time is up due to failure to receive the CI signal from the calling station.
The same applies to the case where the am signal is not transmitted.

Next, a fourth embodiment of the present invention will be described. This embodiment has a configuration similar to that of the above-described third embodiment, and a description thereof will be omitted.

Next, the operation of the present embodiment will be described with reference to FIGS.
The operation of the present embodiment will be described with reference to the third embodiment.
Since the operation is substantially the same as that of the embodiment, the same portions are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described.

Facsimile apparatus (calling station) according to this embodiment
10 executes the control routine shown in FIG. 13. If it is determined in step 58 that the NSF signal / DIS signal has been received from the responding station, in step 100, the above-described processing (steps 92 to 72 ( 11) is executed.

At step 56, it is determined that the ANSam signal has been received from the responding station. If it is determined that the eight communication procedures can be continued, in step 102, a CM signal is sent to the responding station. Note that, as described above, the CM signal is transmitted a plurality of times up to a predetermined T1 time until a CJ signal described later is transmitted.

After starting the transmission of the CM signal, the calling station receives a JM signal following the ANSam signal from the answering station (step 104; Y). The JM signal includes information on the communication capability that can be executed by the response station among the communication capabilities represented by the CM signal, and is transmitted from the response station a plurality of times. By receiving the JM signal, the calling station can recognize a common communication capability between the calling station and the answering station.

When the same JM signal is received twice or more, in the next step 106, a CJ signal indicating the end of the CM signal is transmitted to the 3-octet responding station.

Then, at step 108, the CM signal, J
Negotiation is performed with the M signal. As a result of the negotiation, If the communication is possible by the communication procedure of the I.T.T. Shift to the communication procedure of 30ANNEXF. If the communication is not possible in the communication procedure of step S34, step 82 is performed.
Perform 30 procedures.

As described above, V.I. 8 As a result of negotiation with the CM signal and the JM signal during communication based on the communication procedure,
V. If communication is not possible in the communication procedure of V.34, 8 based on the ITU-T Recommendation T.8. 30 procedures are performed. So, after that,
Even if a DIS signal is received from a responding station (having V.8 communication capability), the above negotiation is not performed again, and a communication error does not occur. Communication can be continued by 30 communication procedures.

In step 100, step 92
Step 72 instead of Step 72 (see FIG. 11)
Steps 72 to 72 (see FIG. 5) or steps 86 to 72 (see FIG. 9) may be executed. In this case, the process of step 90 is omitted.

Next, a fifth embodiment of the present invention will be described. This embodiment has a configuration similar to that of the above-described first embodiment, and a description thereof will be omitted.

Next, the operation of the present embodiment will be described with reference to FIGS.
This will be described with reference to FIG. The facsimile apparatus (response station) 10 according to the present embodiment receives a call in response to the dial dial tone of the calling station (step 112; Y, FIG. 16).
Thereafter, at step 114, a CI reception counter for counting the number of times the CI signal is received is set to 0, and at step 116, the ANSam signal is transmitted.

At the next step 118, it is determined whether or not a CM signal has been received. If a CM signal has been received, at step 130, the normal ITU-T Recommendation V.10 is used. Continuation of communication procedure 8 (steps 310 to 318, see FIG. 8)
I do.

As shown in FIG. 16, if the ANSam signal is not detected by the calling station and no CM signal is transmitted from the calling station, it is determined in step 118 that no CM signal has been received. Is the NSF / DI in step 120
Send the S signal to the calling station. In addition, the DIS signal includes V.V. 8 Include information that indicates ability.

In the next step 122, it is determined whether or not the preamble has been received. If the preamble has been received, in a step 134, the normal ITU-T Recommendation T.30 is used. 30
Communication procedure.

If it is determined in step 122 that the preamble has not been received, in step 124, the CI
It is determined whether a signal has been received. If it is determined that no CI signal has been received, the process returns to step 120 and
The above processing (steps 120 to 124) is executed.

If it is determined in step 124 that the CI signal has been received, it is determined in step 126 whether the value of the CI reception counter has reached the upper limit of the number of times of receiving the CI signal. When it is determined in step 126 that the value of the CI reception counter has not reached the upper limit of the number of times of receiving the CI signal, in step 128, the CI reception counter is incremented by 1 and the process returns to step. On the other hand, when it is determined in step 126 that the value of the CI reception counter has reached the upper limit of the number of times of receiving the CI signal, in step 136, the NSF / DIS signal is transmitted to the calling station. In this case, the DIS signal includes V.V. 8 Include information that indicates no capability. Thus, the calling station determines that the answering station is V. 8 Judge that you have no ability. Therefore, between the calling station and the answering station, a normal ITU-
Recommendation T. Communication is continued by the communication procedure of No. 30 (step 138).

As described above, as shown in FIG. 16, whether the transmitted ANSam signal is not detected by the calling station, the CI signal is received instead of the CM signal, and whether the number of times of reception of the CI signal has reached the upper limit value or not. By determining whether or not V.V. 8 to determine whether the communication procedure can be continued. If it is determined that the communication procedure cannot be continued, the responding station sends the V.8 communication procedure to the responding station. 8 by transmitting a DIS signal including information indicating that there is no capability to the calling station. 3
Since the communication is continued in the communication procedure of the ITU-T Recommendation T.0, no communication error occurs even if the transmitted ANSam signal is not detected by the calling station. Communication can be continued by 30 communication procedures.

Next, a sixth embodiment of the present invention will be described. This embodiment has a configuration similar to that of the above-described fifth embodiment, and a description thereof will not be repeated.

Next, the operation of the present embodiment will be described with reference to FIGS.
The operation of the present embodiment will be described with reference to FIG.
Since the operation is substantially the same as that of the embodiment, the same portions are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described.

Facsimile apparatus (response station) according to this embodiment
10 executes the control routine shown in FIG. 17, and after step 112, executes step 116. Step 1
If it is determined in step 18 that the CM signal has not been received, the DIS transmission timer is started in the next step 140. In step 142, it is determined whether or not the DIS transmission timer has expired. If it is determined that the timer has expired, the process proceeds to step 136.

On the other hand, if it is determined in step 142 that the DIS sending timer has not expired, steps 120 to 124 are executed, and
If it is determined that the CI signal has been received, the ANSam signal is transmitted in step 144, and the
It is determined whether a CM signal has been received. If a CM signal has been received, in step 130, a normal ITU-
T Recommendation V. The communication procedure of step 8 is continued, and if a CM signal has not been received, the process returns to step 142.

Therefore, as shown in FIG. 18, the DI signal started when the transmitted ANSam signal was not detected by the calling station and it was initially determined that the CM signal was not received.
By determining whether the S transmission timer has timed out, the V.S. 8 to determine whether the communication procedure can be continued. If it is determined that the communication procedure cannot be continued, the responding station sends the V.8 communication procedure to the responding station. 8 By sending a DIS signal to the calling station containing information indicating that there is no capability,
ITU-T Recommendation T. Since the communication is continued in the communication procedure of the ITU-T Recommendation T.30 even if the transmitted ANSam signal is not detected by the calling station, no communication error occurs. Communication can be continued by 30 communication procedures.

Next, a seventh embodiment of the present invention will be described. This embodiment has a configuration similar to that of the above-described sixth embodiment, and a description thereof will be omitted.

Next, the operation of this embodiment will be described with reference to FIGS.
The operation of the present embodiment will be described with reference to FIG.
Since the operation is substantially the same as that of the embodiment, the same portions are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described.

Facsimile apparatus (response station) according to this embodiment
10 executes the control routine shown in FIG. 19, and if it is determined in step 118 that the CM signal has not been received, in step 152, a DIS transmission counter for counting the number of times of transmission of the DIS signal is set to 0, Step 1
At 54, it is determined whether or not the value of the DIS sending counter has reached the upper limit of the number of times of sending the DIS signal. DIS
If the value of the sending counter has not reached the upper limit value of the number of times of sending the DIS signal, after executing step 120, in step 156, the DIS sending counter is incremented by 1 and steps 122 to 146 are executed. I do. On the other hand, if the value of the DIS sending counter has reached the upper limit of the number of times of sending the DIS signal, step 1 is executed.
Proceed to 36, 138.

Therefore, as shown in FIG. 20, when the transmitted ANSam signal is not detected by the calling station and the CM signal is not received, the DIS transmission counter which increments each time the DIS signal is transmitted is determined. By determining whether the upper limit has been reached, V.V. 8 to determine whether the communication procedure can be continued. If it is determined that the communication procedure cannot be continued, the responding station sends the V.8 communication procedure to the responding station. 8 by transmitting a DIS signal including information indicating that there is no capability to the calling station. Since the communication is continued by the communication procedure of No. 30, the transmitted ANS
am signal is not detected by the calling station, no communication error occurs and the normal ITU-T Recommendation T.30 is used. Communication can be continued by 30 communication procedures.

Next, an eighth embodiment of the present invention will be described. This embodiment has a configuration similar to that of the above-described seventh embodiment, and a description thereof will be omitted.

Next, the operation of the present embodiment will be described with reference to FIGS.
The operation of the present embodiment will be described with reference to FIG.
Since the operation is substantially the same as that of the embodiment, the same portions are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described.

Facsimile apparatus (calling station) according to this embodiment
10 executes the control routine shown in FIG. 21. If it is determined in step 118 that the CM signal has not been received, in step 160, the above-described processing (step 15) is performed.
2 to step 146 (see FIG. 19)).

At step 118, it is determined that the CM signal has been received, If it is determined that it is possible to shift to the 8 communication procedure, a JM signal is sent to the responding station in step 162. The JM signal is transmitted a plurality of times, with a predetermined T1 time as an upper limit, until a CJ signal described later is received by 3 octets.

After the start of the transmission of the JM signal, step 16
At 4, the receiving station waits for reception of the CJ signal following the CM signal. Here, when the CJ signal is received for 3 octets, the affirmative determination is made in step 164, and in step 166, the CM
Negotiation is performed with the signal and the JM signal. As a result of the negotiation, If the communication can be performed according to the communication procedure of I.34, in step 168, the normal ITU-T Recommendation T.34 is used. 30
Shift to ANNEXF communication procedure. If communication is not possible in the communication procedure of step 34, the process proceeds to steps 136 and 138.

As described above, V.V. 8 As a result of negotiation with the CM signal and the JM signal during communication based on the communication procedure,
V. If the communication is not possible in the communication procedure of No. 34, V.34 Since the DIS signal including the information indicating that there is no capability is transmitted to the calling station, the above-mentioned negotiation is not performed again, no communication error occurs, and the normal ITU-R
Recommendation T. Communication can be continued by 30 communication procedures.

In step 160, step 15
Steps 120 to 128 (see FIG. 15) may be executed instead of steps 2 to 146 (see FIG. 19). In this case, step 114 is performed between step 112 and step 116. Or
Steps 140 to 146 (see FIG. 17) may be executed.

[0110]

As described above, the present invention provides an ITU-
T Recommendation V. If it is determined that this communication cannot be continued during communication based on the communication procedure in accordance with ITU-8,
-T Recommendation V. 8 instead of the communication procedure according to ITU-T Recommendation T.8. In order to communicate based on the communication procedure according to 30,
ITU-T Recommendation T. In a communication procedure according to V.30, V.30 is used. 8
Since the CI signal is not transmitted even if the DIS signal including the information indicating the capability is received, the DIS
Signal transmission and the transmission of the CI signal by the calling station can be prevented from being repeated. There is an effect that communication can be continued in a communication procedure conforming to No. 30.

In the present invention, according to ITU-T Recommendation V. 8
During communication based on a communication procedure according to ITU-T Recommendation V. If it is determined that it is not possible to shift to a communication procedure according to ITU-T Recommendation T.34, the above communication means is replaced. 30
Since communication is performed based on a communication procedure according to 8 even if a DIS signal including information indicating that it has the capability is received. In the communication procedure based on I.30, I
TU-T Recommendation V. Since it is not determined again whether or not it is possible to shift to the communication procedure according to the ITU-T Recommendation T.34, it is possible to prevent a repetition stage of the determination, and without causing a communication error. 3
There is an effect that communication can be continued in a communication procedure according to 0.

Further, according to ITU-T Recommendation V. If it is determined that the communication based on the communication procedure cannot be continued during the communication based on the communication procedure based on the communication procedure 8, information indicating that the communication based on the communication procedure cannot be performed is transmitted. Since the CI signal is not transmitted from the station, it is possible to prevent the transmission of the DIS signal by the responding station and the transmission of the CI signal by the calling station to be repeated. There is an effect that communication can be continued in a communication procedure conforming to No. 30.

In the present invention, according to ITU-T Recommendation V. 8
During communication based on a communication procedure according to ITU-T Recommendation V. If it is determined that it is not possible to shift to a communication procedure according to ITU-T Recommendation V.34, information indicating that communication is not possible in the above communication procedure is transmitted. Communication based on a communication procedure according to ITU-T Recommendation V.8 is not performed. Since it is not determined again whether or not it is possible to shift to the communication procedure according to the ITU-T Recommendation T.34, it is possible to prevent the determination from being repeated and without causing a communication error. There is an effect that communication can be continued in a communication procedure conforming to No. 30.

[Brief description of the drawings]

FIG. 1 is a block diagram of a facsimile apparatus according to a first embodiment.

FIG. It is the figure which showed the basic communication procedure of 30 ANNEXF.

FIG. It is the figure which showed the 30 binary communication procedure.

FIG. 4 is a diagram showing a configuration of a DIS signal.

FIG. 5 is a flowchart showing a control routine of the facsimile apparatus (calling station) according to the first embodiment.

FIG. 6 is a diagram showing a protocol procedure of the facsimile apparatus (calling station) according to the first embodiment.

FIG. 7 is a flowchart showing a subroutine of step 80 in FIG. 5;

FIG. 9 is a flowchart showing a control routine of a response station having eight capabilities.

FIG. 9 is a flowchart showing a control routine of a facsimile apparatus (calling station) according to the second embodiment.

FIG. 10 is a diagram showing a protocol procedure of a facsimile apparatus (calling station) according to the second embodiment.

FIG. 11 is a flowchart showing a control routine of a facsimile apparatus (calling station) according to the third embodiment.

FIG. 12 is a diagram showing a protocol procedure of a facsimile apparatus (calling station) according to the third embodiment.

FIG. 13 is a flowchart showing a control routine of a facsimile apparatus (calling station) according to a fourth embodiment.

FIG. 14 is a diagram showing a protocol procedure of a facsimile apparatus (calling station) according to a fourth embodiment.

FIG. 15 is a flowchart illustrating a control routine of a facsimile apparatus (response station) according to a fifth embodiment.

FIG. 16 is a diagram showing a protocol procedure of a facsimile apparatus (response station) according to a fifth embodiment.

FIG. 17 is a flowchart showing a control routine of a facsimile apparatus (response station) according to the sixth embodiment.

FIG. 18 is a diagram showing a protocol procedure of the facsimile apparatus (response station) according to the sixth embodiment.

FIG. 19 is a flowchart showing a control routine of a facsimile apparatus (response station) according to the seventh embodiment.

FIG. 20 is a diagram showing a protocol procedure of the facsimile apparatus (response station) according to the seventh embodiment.

FIG. 21 is a flowchart showing a control routine of a facsimile apparatus (response station) according to the eighth embodiment.

FIG. 22 is a diagram showing a protocol procedure of the facsimile apparatus (response station) according to the eighth embodiment.

[Explanation of symbols]

 38 Digital Network Controller

Continued on the front page (72) Inventor Hiroaki Sakaki 3-7-1 Funai, Iwatsuki City, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Office (72) Inventor Nobuyuki Kudo 3-7-1 Fuchu, Iwatsuki City, Saitama Fuji Xerox Co., Ltd. Iwatsuki Office (72) Inventor Yoshihiro Mae 3-7-1, Funai, Iwatsuki City, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Office (72) Inventor Hirotaka Kawabata 3-chome, Iwatsuki City, Saitama Prefecture No. 1 Fuji Xerox Co., Ltd. Iwatsuki Office

Claims (6)

[Claims] 1. An ITU-T Recommendation V. A first communication unit that performs communication based on a communication procedure based on a communication procedure according to claim 8, and whether or not communication based on the communication procedure can be continued during communication based on the communication procedure by the first communication unit. Determining means for determining, and when it is determined that the communication cannot be continued by the determining means, the ITU-T Recommendation T. is replaced with the communication means. And a second communication means for performing communication based on a communication procedure conforming to No. 30. 2. The method according to claim 1, wherein the determining unit counts the number of times the call display signal is transmitted, and determines whether the count value is equal to or greater than a predetermined value, and determines whether the count value is equal to or greater than a predetermined time from when the first digital identification signal is received. 2. The communication terminal device according to claim 1, wherein the communication terminal device counts whether a response tone has been received and the number of times the digital identification signal has been received, and determines whether one of the count values has exceeded a predetermined value. 3. The method according to ITU-T Recommendation V.3. And a first communication unit that performs communication based on a communication procedure according to ITU-T Recommendation V.8. A determination unit for determining whether it is possible to shift to a communication procedure in accordance with ITU-T Recommendation V.34. If it is determined that it is not possible to shift to the communication procedure in accordance with ITU-T Recommendation T.34, the communication operation is not possible. And a second communication means for performing communication based on a communication procedure conforming to No. 30. 4. ITU-T Recommendation V. Communication means for communicating based on a communication procedure according to 8, determination means for determining whether or not communication based on the communication procedure can be continued during communication based on the communication procedure by the communication means; A communication terminal device comprising: a transmitting unit that transmits information indicating that communication cannot be performed in the communication procedure when the determining unit determines that the communication cannot be continued. 5. The determination means counts the number of times the call indication signal is received, determines whether the count value is equal to or greater than a predetermined value, and determines whether the count value is equal to or greater than a predetermined time after transmission of the first modified response tone. 5. The communication terminal device according to claim 4, wherein the communication terminal device counts whether or not the call menu signal has been received and the number of times of transmitting the digital identification signal, and determines whether or not the counted value is equal to or more than a predetermined value. 6. ITU-T Recommendation V. Communication means for performing communication based on a communication procedure according to claim 8, and
TU-T Recommendation V. A determination unit for determining whether it is possible to shift to a communication procedure in accordance with ITU-T Recommendation V.34. 34. A communication terminal device comprising: sending means for sending information indicating that communication cannot be performed in the communication procedure when it is determined that it is not possible to shift to a communication procedure in accordance with the communication procedure.