JPH10271302A - Communication terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue communication, even in case of signal reception disability showing the end of call origination menu signal to be sent from a call originating station by moving a communication procedure to a line-probing phase, when carrier down is detected while a common menu signal is sent to the call originating station. SOLUTION: When a response station receives a call origination menu(CM) signal, containing the communication ability information of call originating station from the call originating station, a common menu (JM) signal is sent to the call originating station. Next, when a CM terminator and a CJ signal sent from the call originating station are received, the next line probing is started and communication is performed based on ITU-T recommendation V.34. When the CJ signal sent from the call originating station is not received, the presence/absence of carrier down is discriminated. When there is carrier down, the communication procedure is moved to line probing and communication is performed based on ITU-T recommendation V.34. Therefore, the procedure is moved to line probing by detecting the carrier down of the carrier transmitted from the call originating station, together with the reception confirmation of JM signal and the reception of CJ signal during the transmission of JM signal.

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 specifically, to ITU-T Recommendation V.1. 8 and V.I. The present invention relates to a communication terminal device having a function of performing communication based on a communication procedure according to No. 34.

[0002] ITU-T stands for International Te
lecommunications Union−Telecommunications Standar
dization Sector, meaning the Telecommunication Standardization Sector of the International Telecommunication Union. ITU-T Recommendation V. 8 describes a procedure for starting a session for data transmission in a general exchange telephone network. Numeral 34 denotes a general exchange telephone network and a two-wire point-to-point telephone type dedicated line 28
Standards relating to modems operating at data signal speeds up to 800 bit / s are respectively defined.

In this specification, the following various signals are represented by corresponding abbreviations.

[0004]

[Table 1]

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

[0006] 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.

[0008] The common menu signal (JM signal) is a signal transmitted from the communication terminal apparatus (response station) on the called side.
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 calling indication 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.

[0011]

2. Description of the Related Art Conventionally, in ITU-T, Recommendation V.
As a function extension of 32 (standard of a two-wire full-duplex modem up to 9600 bps), 28 exceeding 14400 bps
Standards for two-wire full-duplex / half-duplex modems up to 800 bps are recommended in V.80. 34. Then ITU
-T Recommendation V. ITU-T Recommendation T.34 is a standard that applies to the communication procedure of facsimile machines. 30 ANNEXF has been established.

[0012]

[Problems to be Solved by the Invention] ITU-T Recommendation T. 3
0 At the start of communication among the communication procedures defined by ANNEXF, network interaction (phase 1) for recognizing the communication function and the like of the partner station is performed. ITU-T
Recommendation T. In 30 ANNEXF, in the network interaction, if the answering station cannot receive the CJ signal to be sent from the calling station while transmitting the JM signal, the calling station and the answering station operate as follows. That is, as shown in FIG. 16, after the line connection, the calling station transmits the CM signal after receiving the ANSam signal from the responding station, and transmits the CJ signal a predetermined number of times after receiving the JM signal from the responding station. After that, it shifts to the next communication procedure, line probing, but since negotiation with the responding station is not established,
It operates to disconnect the connection to the communication line.

[0013] On the other hand, after transmitting the ANSam signal to the calling station, the responding station waits until the time T1 elapses from the time when the call is received.
If the M signal is transmitted and the CJ signal is not received from the calling station during this time, the connection to the communication line is disconnected when the time T1 times out.

As described above, the ITU-T Recommendation T. 30 ANNEX
CJ to be sent from the calling station while transmitting a JM signal at the answering station when communication is performed according to the communication procedure specified in F.
If a signal cannot be received, there is a problem that communication between the calling station and the answering station is interrupted.

The present invention has been made in view of such circumstances, and has been developed in accordance with ITU-T Recommendation V.3. 8 and V.I. In a communication terminal device having a function of performing communication based on a communication procedure conforming to C.34, communication can be continued even when a CJ signal to be sent from a calling station cannot be received during transmission of a JM signal. It is an object to provide a communication terminal device.

[0016]

Means for Solving the Problems To achieve the above object, the invention described in claim 1 is based on ITU-T Recommendation V.3. 8 and V.I. 34. A communication terminal device having a function of performing communication based on a communication procedure according to claim 34, comprising: carrier down detection means for detecting carrier down during communication with a calling station; and sending a common menu signal to the calling station. And control means for shifting a communication procedure to a line probing phase when carrier down is detected by the carrier down detection means.

In the communication terminal device having the above configuration, during transmission of the common menu signal, transmission of the common menu signal from the calling station together with confirmation of reception of the common menu signal and reception of the CM terminator signal indicating the end of the calling menu signal. A carrier down of the carrier to be performed is detected, and when the carrier down is detected, the communication procedure is shifted to line probing.

According to the first aspect of the present invention, even if the carrier transmitted from the calling station has gone down, the ITU-T Recommendation T.40 has been adopted. Communication can be continued based on 30 ANNEXF.

The invention according to claim 2 is based on ITU-T
Recommendation V. 8 and V.I. 34. A communication terminal device having a function of performing communication based on a communication procedure according to claim 34, comprising: carrier down detection means for detecting carrier down during communication with a calling station; and sending a common menu signal to the calling station. If a carrier down is detected by the carrier down detecting means during the communication, the communication procedure is recommended. And control means for causing the communication procedure to fall back to a communication procedure conforming to 21.

In the communication terminal device having the above-mentioned configuration, during transmission of the common menu signal, transmission of the common menu signal and transmission of the CM terminator signal, which is a signal indicating the end of the calling menu signal, are transmitted from the calling station. The carrier down of the carrier to be performed is detected, and when the carrier down is detected, the communication procedure is recommended. 21 which is a communication procedure conforming to the standard T.21. Move to the 30 binary procedure.

According to the second aspect of the present invention, even when the carrier transmitted from the calling station is down, the recommendation V.1 is applied. 21 which is a communication procedure conforming to the standard T.21. 3
Communication can be continued based on the 0 binary procedure.

The invention according to claim 3 is based on ITU-T
Recommendation V. 8 and V.I. 34. A communication terminal device having a function of performing communication based on a communication procedure according to 34, wherein a line probing signal for detecting a line probing signal transmitted from a calling station when a communication procedure in a line probing phase is started. Detecting means, and control means for shifting a communication procedure to a line probing phase when a line probing signal is detected by the line probing signal detecting means during transmission of a common menu signal to a calling station. I do.

In the communication terminal device having the above configuration, while transmitting the common menu signal, the calling station confirms the reception of the common menu signal and receives the CM terminator signal which is a signal indicating the end of the calling menu signal. When shifting from network interaction to line probing, which is the next communication procedure, a line probing signal sent from the calling station is detected first, and if a line probing signal is detected, the communication procedure is changed to line probing. Migrate.

According to the third aspect of the present invention, even when the CM terminator signal to be transmitted from the calling station cannot be received, the ITU-T Recommendation T.30 is used. Communication can be continued based on 30 ANNEXF.

The invention according to claim 4 is based on ITU-T
Recommendation V. 8 and V.I. 34. A communication terminal device having a function of performing communication based on a communication procedure according to 34, wherein the communication terminal device is activated when a calling menu signal is received from a calling station and specifies a transmission time of a common menu signal by a timeout of a set time. A common menu signal transmission timer for transmitting the communication procedure to the line probing phase when the common menu signal transmission timer times out during transmission of the common menu signal to the calling station. .

In the communication terminal having the above configuration, upon detecting the calling menu signal sent from the calling station, a common menu signal sending timer for defining the sending time of the common menu signal is started, and While the common menu signal is being transmitted, the common menu signal is received, the CM terminator signal indicating the end of the calling menu signal is received, the timeout of the common menu signal transmission timer is monitored, and the common menu signal transmission timer is monitored. When the timeout occurs, the communication procedure is shifted to line probing.

According to the fourth aspect of the present invention, even when the CM terminator signal to be transmitted from the calling station cannot be received, the ITU-T Recommendation T.40 is used. Communication can be continued based on 30 ANNEXF.

Further, the invention according to claim 5 is an ITU-T
Recommendation V. 8 and V.I. 34. A communication terminal device having a function of performing communication based on a communication procedure according to 34, wherein the communication terminal device is activated when a calling menu signal is received from a calling station and specifies a transmission time of a common menu signal by a timeout of a set time. And a communication procedure when the common menu signal transmission timer times out during transmission of the common menu signal to the calling station. And control means for causing the communication procedure to fall back to a communication procedure conforming to 21.

In the communication terminal device having the above configuration, upon detecting the calling menu signal sent from the calling station, a common menu signal sending timer for defining the sending time of the common menu signal is started, and the calling station is instructed. While the common menu signal is being transmitted, the common menu signal is received, the CM terminator signal indicating the end of the calling menu signal is received, the timeout of the common menu signal transmission timer is monitored, and the common menu signal transmission timer is monitored. If the communication has timed out, the communication procedure is recommended. 21 which is a communication procedure conforming to the standard T.21. Move to the 30 binary procedure.

According to the fifth aspect of the present invention, even when the CM terminator signal to be transmitted from the calling station cannot be received, the recommendation V.1 is applied. 21 which is a communication procedure conforming to the standard T.21. Communication can be continued based on 30 binary procedures.

[0031]

Embodiments of the present invention will be described below in detail with reference to the drawings.

[Overall Configuration of Facsimile Apparatus] FIG. 1 shows the overall configuration of a facsimile apparatus 10 as an example of a communication terminal apparatus according to an embodiment of 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, a display unit for operating the facsimile machine 10, and an operation display device provided with operation switches and the like. 16, a reading device 18 for reading a transmission original, a printing device 20 for printing and outputting received image information, an image processing device 22 for performing image processing such as encoding / decoding / enlarging / reducing, image information to be transmitted or received Storage unit 24 for storing files and files, a system control program storage unit 28 composed of a ROM storing a program for controlling the entire facsimile machine 10, and a program for controlling communication suitable for an analog network (for example, G3). Communication control program storage unit 30 composed of stored ROM, ITU-T WARNING V. 8, V. 34, V.I. 17,
V. 29, V.S. A modem (modulator / demodulator) 32 having a function of performing communication based on a communication procedure according to 21 and a network controller 34 for connecting the facsimile apparatus 10 to an analog network are provided.

CPU 12, RAM 14, operation display device 1
6, reading device 18, printing device 20, image processing device 22,
The storage device 24, the system control program storage unit 28, and the communication control program storage unit 30 are interconnected by a system bus 26.

The communication control program storage unit 30 stores
It is interconnected with a network controller 34 via a modem (modulator / demodulator) 32.

In each of the embodiments of the present invention, the facsimile apparatus 10 as a responding station is connected to a partner station by ITU-T Recommendation V.3.
8 and V.I. When communication is performed based on a communication procedure according to 34, a T1 timer that measures the time from the time of receiving a call until the time T1 elapses, and the transmission of a JM signal from the time of receiving a CM signal from the calling station. The timer function of the JM signal transmission timer for measuring the time T until the processing ends (the time T is set to a time shorter than the time T1, for example, 15 seconds) is provided in each embodiment of the present invention. Although implemented as a soft timer by a program stored in the unit 30, the present invention is not limited to this, and may be implemented by hardware.

Further, in each embodiment of the present invention, the facsimile apparatus 10 as a responding station has the functions of carrier down detecting means for detecting carrier down from a calling station and line probing signal detecting means for detecting a line probing signal. Although it is realized by executing a program stored in the communication control program storage unit 30 using the function of the modem 32, it may be realized by hardware.

[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 the procedure at the start of communication, the procedure at the time of transmitting image information, and the 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 line probing (phase 2),
First, signals INFO0a and INFO indicating modem capability and the like.
0c is transmitted from the answering station and the calling station, respectively.

It should be noted that, of the network interaction, V. 8 is performed, and after the next line probing, V.8 is performed. The operation based on the 34 half-duplex operation mode is performed.

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

After calling (step 102 in FIG. 3), the calling station waits for a signal from the answering station (step 10).
4). If the received signal is an ANSam signal (if affirmative in step 106), a silence period of Te seconds (0.5 seconds or more) defined in advance (step 108)
Then, a CM signal including the communication capability information of the calling station (for example, whether or not the calling station has the capability of executing the V.34 procedure) is transmitted to the answering station (step 110). The CM signal is transmitted a plurality of times, with a predetermined T1 time as an upper limit, until a CJ signal described later is transmitted.

After the start of the transmission of the CM signal, the calling station receives a JM signal following the ANSam signal from the answering station. 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 twice or more (Yes at step 112), the calling station sends a CJ signal indicating the end of the CM signal to the answering station (step 11).
4). Here, after transmitting the CJ signal by 3 octets (affirmed in step 116), the calling station follows the silent period of 75 ± 5 milliseconds (step 118), and then sets the V.V. 34
It shifts to the execution phase of the procedure (phase after the line probing (phase 2)) (step 120).

If the signal received in step 104 is a signal other than the ANSam signal (for example, a CED signal or preamble) (that is, if the result is negative in step 106), the low speed signal transmitted thereafter (for example, 30
0 bps) NSF / DIS signal is received and analyzed (step 122). Here, V.V.
8 based on a predetermined bit indicating the presence or absence of the capability. 8 (step 1).
24).

Here, if the responding station is V. 8 if you do not have the ability. Move to 30 binary procedure (Step 1)
30). On the other hand, if the answering station is If it has eight capabilities, after transmitting the CI signal to the responding station (step 126), it waits for the reception of the ANSam signal again (step 12).
8). When the ANSam signal is received, the process proceeds to step 108, and thereafter, the same procedure as described above is executed.

After receiving the call (step 202 in FIG. 4), the answering station sends an ANSam signal to the calling station (step 206) following a silent period of at least 200 milliseconds (step 204). However, at this point, the T.D. In some cases, a CED signal, a preamble, and a low-speed (for example, 300 bps) NSF / DIS signal are transmitted to the calling station according to a 30-binary procedure.

Thereafter, reception of a CM signal or a CI signal from the calling station is waited for (steps 208 and 220). When the responding station receives the same CM signal two or more times (Yes at step 210), it sends a JM signal to the responding station (step 212). 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 transmission of the JM signal, the responding station waits for reception of the CJ signal following the CM signal from the calling station (step 214). Here, when the CJ signal is received by 3 octets (Yes at step 214), the responding station receives the CJ signal.
Following a silence period of ± 5 ms (step 216),
V. Move to the execution phase of 34 procedures (phase after line probing (phase 2)) (step 21)
8).

In steps 208 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 determination in step 224 is affirmative), T . The process proceeds to a 30 binary procedure (step 226).

However, when a CI signal is received, ANSa
m signal is transmitted again (step 222), and step 20 is executed.
Then, the process returns to waiting for the reception of the CM signal No. 8.

Next, a communication procedure in a network interaction of the communication terminal apparatus according to the first embodiment of the present invention will be described with reference to FIGS. As shown in the sequence diagram of FIG. 6, the communication terminal apparatus according to the first embodiment of the present invention confirms that a JM signal to be sent from a calling station has been received while a JM signal is being sent by a responding station. Upon receiving the CJ signal, which is a signal indicating the end of the CM signal, detecting the carrier down of the carrier transmitted from the calling station, and shifting the communication procedure to line probing when the carrier down is detected. I have. Hereinafter, a specific description will be given with reference to the flowchart of FIG. In the figure, when the facsimile apparatus 10 as a response station receives a call (step 302), it activates a T1 timer (step 304) and sends an ANSam signal to the calling station (step 306).

C from the calling station including communication capability information of the calling station
When the M signal is received (step 308), a JM signal is sent to the calling station (step 310). Next, when the CJ signal transmitted from the calling station is received, that is, when "Yes" is determined in step 312, the process proceeds to the next line probing, and the ITU-T Recommendation T.30 is used. 30AN
Based on NEXF, i.e. ITU-T Recommendation V. Communication is performed on the basis of No. 34 (steps 314, 316).

If the CJ signal transmitted from the calling station is not received, that is, if “No” is determined in step 312, it is determined in step 318 whether or not carrier down is detected. If carrier down is detected in step 318, the communication procedure shifts to line probing, and the ITU-T Recommendation T.30 is used. Communication is performed based on 30 ANNEXF (steps 314, 316).

If carrier down is not detected in step 318, it is determined in step 320 whether or not the time T1 has elapsed since the start of the T1 timer. If the time T1 has elapsed, the communication is terminated. (Step 32
2) If the time T1 has not elapsed, step 310
Then, the communication procedure from step 310 described above is performed.

In the communication terminal device according to the first embodiment of the present invention, while transmitting the JM signal, the communication terminal device confirms the reception of the JM signal and receives the CJ signal which is a signal indicating the end of the CM signal. When the carrier down of the carrier transmitted from the station is detected and the carrier down is detected, the communication procedure is shifted to the line probing, so that the carrier transmitted from the calling station is carrier down. Even in ITU-T Recommendation T. Communication can be continued based on 30 ANNEXF.

Next, a communication procedure in a network interaction of the communication terminal device according to the second embodiment of the present invention will be described with reference to FIGS. As shown in the sequence diagram of FIG. 7, the communication terminal apparatus according to the second embodiment of the present invention confirms reception of a JM signal to be sent from a calling station while transmitting a JM signal at a responding station. Along with the reception of the CJ signal indicating the end of the CM signal, a carrier down of the carrier transmitted from the calling station is detected. When the carrier down is detected, the communication procedure is described in ITU-T Recommendation V.3. 21 (the preamble and the DIS signal indicating that the called terminal has the receiving function of the ITU-T standard are transmitted to shift to the normal T.30 binary procedure).

Hereinafter, a specific description will be given with reference to the flowchart of FIG. In the figure, after the facsimile apparatus 10 as a response station receives a call, the ITU-T Recommendation T.30 is used.
The communication terminal according to the first embodiment shown in FIG. 11 performs the processing of steps 302 to 316 in which the communication procedure based on 30ANNEXF is normally performed and ends and the steps 320 and 322 of terminating the communication when the T1 timer times out. Since it is the same as the case of the device, duplicate description will be omitted. In FIG. 12, after receiving the CM signal transmitted from the calling station, a JM signal is transmitted to the calling station, and a signal indicating that the JM signal to be transmitted from the calling station has been received and indicating the end of the CM signal. If the CJ signal is not received (steps 308 to 312), it is determined in step 318 whether carrier down of the carrier transmitted from the calling station is detected. The detection of carrier down of the carrier transmitted from the calling station is performed together with the reception of the CJ signal while the facsimile apparatus 10 as the responding station is transmitting the JM signal. If carrier down is detected in step 318, a DIS signal indicating that the called terminal has an ITU-T standard receiving function is transmitted together with the preamble, and
21 mode normal T. The process proceeds to the 30 binary procedure (steps 424, 426).

If no carrier down is detected in step 318, the flow shifts to step 320 to perform the same processing as in the first embodiment shown in FIG. 11 (steps 320, 322, 310). In the communication terminal device according to the second embodiment of the present invention, J
While transmitting the M signal, together with the confirmation of the detection of the JM signal and the reception of the CJ signal indicating the end of the CM signal, the carrier down of the carrier transmitted from the calling station is detected,
If carrier down is detected, the communication procedure is recommended. 21 which is a communication procedure conforming to the standard T.21. 30 binary procedure, even if the carrier transmitted from the calling station is down, the recommendation V.30 is used. 21 which is a communication procedure conforming to the standard T.21. Communication can be continued based on 30 binary procedures.

Next, a communication procedure in a network interaction of a communication terminal device according to a third embodiment of the present invention will be described with reference to FIGS. As shown in the sequence diagram of FIG. 8, the communication terminal apparatus according to the third embodiment of the present invention confirms that a JM signal to be sent from a calling station has been received while a responding station is sending a JM signal. Upon receiving the CJ signal, which is a signal indicating the end of the CM signal, when the calling station shifts from the network interaction to line probing, which is the next communication procedure, the line probing signal I, which is first transmitted from the calling station, is transmitted.
The NFO00 signal is detected, and when a line probing signal is detected, the communication procedure is shifted to line probing.

Hereinafter, a specific description will be given with reference to the flowchart of FIG. In the figure, after the facsimile apparatus 10 as a response station receives a call, the ITU-T Recommendation T.30 is used.
The communication terminal according to the first embodiment shown in FIG. 11 performs the processing of steps 302 to 316 in which the communication procedure based on 30ANNEXF is normally performed and ends and the steps 320 and 322 of terminating the communication when the T1 timer times out. Since it is the same as the case of the device, duplicate description will be omitted. In FIG. 13, after receiving the CM signal transmitted from the calling station, a JM signal is transmitted to the calling station, a signal indicating that the JM signal to be transmitted from the calling station has been received and a signal indicating the end of the CM signal. If the CJ signal is not received (steps 308 to 312), it is first transmitted from the calling station when the calling station shifts from network interaction to line probing, which is the next communication procedure, in step 428. It is determined whether the line probing signal INFO00 is detected. Here, the line probing signal INFO00 is, as shown in FIG. 30 In the communication procedure based on ANNEXF, INFO0c from the calling station and INFO0 from the answering station in line probing.
The signal a is first transmitted to the communication line as a.

If the line probing signal INFO00 (corresponding to INFO0c) is detected in step 428, the communication procedure shifts to line probing, and I
TU-T Recommendation T. Communication is performed based on 30 ANNEXF (steps 314, 316).

If the line probing signal INFO00 (corresponding to INFO0c) is not detected in step 428, the flow shifts to step 320, and the processing described above is performed in the same manner as in the first embodiment shown in FIG. (Steps 320, 322, 310) In the communication terminal device according to the third embodiment of the present invention, J
While transmitting the M signal, together with the confirmation of the reception of the JM signal and the reception of the CJ signal indicating the end of the CM signal, when the calling station shifts from network interaction to the next communication procedure, line probing, the first The line probing signal sent from the calling station is detected and the communication procedure is shifted to line probing when the line probing signal is detected. Can not be received even if ITU-T Rec. Communication can be continued based on 30 ANNEXF.

Next, a communication procedure in network interaction of a communication terminal device according to the fourth embodiment of the present invention will be described with reference to FIGS. The communication terminal apparatus according to the fourth embodiment of the present invention, as shown in the sequence diagram of FIG. 9, defines a transmission time of a JM signal when a CM signal transmitted from a calling station is received.
Activate the signal transmission timer, confirm the reception of the JM signal during the transmission of the JM signal to the calling station, receive the CJ signal indicating the end of the CM signal, and monitor the timeout of the JM signal transmission timer, When the JM signal transmission timer times out, the communication procedure is shifted to line probing.

Hereinafter, a specific description will be given with reference to the flowchart of FIG. In the figure, after the facsimile apparatus 10 as a response station receives a call, the ITU-T Recommendation T.30 is used.
The processing of steps 302 to 316 (excluding step 430) in which a communication procedure based on 30ANNEXF is normally performed and terminated, and steps 320 and 322 in which communication is terminated when the T1 timer times out, is the first embodiment shown in FIG. Since it is the same as the case of the communication terminal device according to the embodiment, repeated description is omitted except for necessary parts.

In FIG. 14, C transmitted from the calling station
When the M signal is received (step 308), the JM signal transmission timer is started (step 430). Here, the set time T2 of the JM signal transmission timer that defines the transmission time of the JM signal transmitted from the answering station is the set time T of the T1 timer.
It is set to a time shorter than 1 (for example, 15 seconds).

After the JM signal sending timer is started, a JM signal is sent to the calling station, and the JM signal to be sent from the calling station is sent.
It is determined whether the CJ signal, which is a signal indicating that the M signal has been received and the end of the CM signal, has been received (steps 310 and 312). When the CJ signal is received, the process shifts to line probing, and the ITU-T Recommendation T.30 is used. 30AN
Based on NEXF, i.e. ITU-T Recommendation V. Communication is performed on the basis of No. 34 (steps 314, 316).

On the other hand, if it is determined in step 312 that the CJ signal has not been received, it is determined in step 432 whether or not the JM signal transmission timer has timed out. J
If the M signal transmission timer times out, the communication procedure shifts to line probing, and the ITU-T Recommendation T.M.
Communication is performed based on 30 ANNEXF (step 31)
4, 316).

If the JM signal transmission timer has not timed out in step 432, the above-described processing is performed depending on whether or not the T1 timer has timed out (steps 320, 322, 310).

In the communication terminal apparatus according to the fourth embodiment of the present invention, when a CM signal transmitted from a calling station is received, a JM signal transmission timer for defining a transmission time of a JM signal is started, and a transmission is started. When the JM signal is received during the transmission of the JM signal to the calling station, the CJ signal indicating the end of the CM signal is received, and the timeout of the JM signal transmission timer is monitored, and the JM signal transmission timer times out. Since the communication procedure is shifted to line probing, even if the CJ signal to be transmitted from the calling station cannot be received, the ITU-T Recommendation T.3. 30 ANNEX
The communication can be continued based on F.

Next, a communication procedure in a network interaction of a communication terminal according to a fifth embodiment of the present invention will be described with reference to FIGS. The communication terminal device according to the fifth embodiment of the present invention has the configuration shown in FIG.
As shown in the sequence diagram of FIG.
When the M signal is detected, a JM signal transmission timer for stipulating the transmission time of the JM signal is started, and a signal indicating that the JM signal has been received during the transmission of the JM signal and the end of the CM signal is transmitted to the calling station. The JM signal transmission timer monitors the timeout of the JM signal transmission timer while receiving the signal. 21.

Hereinafter, a specific description will be given with reference to the flowchart of FIG. In the figure, after the facsimile apparatus 10 as a response station receives a call, the ITU-T Recommendation T.30 is used.
The processing of steps 302 to 316 (excluding step 430) in which a communication procedure based on 30ANNEXF is normally performed and terminated, and steps 320 and 322 in which communication is terminated when the T1 timer times out, is the first embodiment shown in FIG. Since it is the same as the case of the communication terminal device according to the embodiment, repeated description is omitted except for necessary parts.

In FIG. 15, C transmitted from the calling station
When the M signal is received (step 308), the JM signal transmission timer is started (step 430). Here, the set time T of the JM signal transmission timer that defines the transmission time of the JM signal transmitted from the response station is the set time T1 of the T1 timer.
A shorter time (for example, 15 seconds) is set.

After the JM signal sending timer is started, a JM signal is sent to the calling station, and the JM signal to be sent from the calling station is sent.
It is determined whether the CJ signal, which is a signal indicating that the M signal has been received and the end of the CM signal, has been received (steps 310 and 312). If the CJ signal is received, the communication procedure shifts to line probing, and the ITU-T Recommendation T.30 is used. Communication is performed based on 30 ANNEXF (steps 314, 316).

On the other hand, if it is determined in step 312 that the CJ signal has not been received, it is determined in step 432 whether the JM signal transmission timer has timed out. J
If the timer for transmitting the M signal has timed out, the called terminal transmits a DIS signal indicating that the called terminal has the reception function of the ITU-T standard together with the preamble, and outputs the V.M signal. 21 mode normal T. Move to 30 binary procedure (step 42)
4, 426).

If the JM signal transmission timer has not timed out in step 432, the above-described processing is performed depending on whether or not the T1 timer has timed out (steps 320, 322, 310).

In the communication terminal device according to the fifth embodiment of the present invention, when a CM signal transmitted from a calling station is detected, a JM signal transmission timer for defining a transmission time of a JM signal is started, and a transmission is started. When the JM signal is received during the transmission of the JM signal to the calling station, the CJ signal indicating the end of the CM signal is received, and the timeout of the JM signal transmission timer is monitored, and the JM signal transmission timer times out. To V. 21 mode normal T. 30 binary procedure, so that even if a CJ signal to be transmitted from the calling station cannot be received, V.30 is used.
21 mode normal T. Communication can be continued based on 30 binary procedures.

[0078]

According to the present invention as described above,
ITU-T Recommendation V. 8 and V.I. In a communication terminal device having a function of performing communication based on a communication procedure conforming to No. 34, communication is continued even when a CM terminator signal to be sent from a calling station cannot be received during transmission of a common menu signal. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a facsimile apparatus to which the present invention is applied.

FIG. 2 shows ITU-T Recommendation V. 8 and V.I. FIG. 34 is a sequence diagram showing a basic communication procedure according to No. 34.

3 is a flowchart showing a basic communication procedure on the calling station side in a network interaction phase in the communication procedure shown in FIG. 2;

FIG. 4 is a flowchart showing a basic communication procedure on the responding station side in a network interaction phase in the communication procedure shown in FIG. 2;

FIG. 21 mode normal T. FIG. 7 is a sequence diagram showing the contents of a 30 binary procedure.

FIG. 6 is a sequence diagram showing a main part of a communication operation of the communication terminal device according to the first embodiment of the present invention.

FIG. 7 is a sequence diagram showing a main part of a communication operation of the communication terminal device according to the second embodiment of the present invention.

FIG. 8 is a sequence diagram showing a main part of a communication operation of the communication terminal device according to the third embodiment of the present invention.

FIG. 9 is a sequence diagram showing a main part of a communication operation of a communication terminal device according to a fourth embodiment of the present invention.

FIG. 10 is a sequence diagram showing a main part of a communication operation of a communication terminal device according to a fifth embodiment of the present invention.

FIG. 11 is a flowchart showing the contents of a communication operation of the communication terminal device according to the first embodiment of the present invention.

FIG. 12 is a flowchart showing the contents of a communication operation of the communication terminal device according to the second embodiment of the present invention.

FIG. 13 is a flowchart showing the contents of a communication operation of the communication terminal device according to the third embodiment of the present invention.

FIG. 14 is a flowchart showing the contents of the communication operation of the communication terminal device according to the fourth embodiment of the present invention.

FIG. 15 is a flowchart showing the contents of a communication operation of the communication terminal device according to the fifth embodiment of the present invention.

FIG. 16 is a sequence diagram showing the contents of a communication operation of a conventional communication terminal device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 facsimile device 12 CPU 14 RAM 16 operation display device 18 reading device 20 printing device 22 image processing device 24 storage device 26 system lot 28 system control program storage unit 30 communication control program storage unit 32 modem 34 network control unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirotaka Kawabata 3-7-1, Fuuchi, Iwatsuki-shi, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Office (72) Inventor Hiroaki Sakaki 3-7-1, Fuuchi, Iwatsuki-shi, Saitama Prefecture 1 Fuji Xerox Co., Ltd. Iwatsuki Office (72) Inventor Masahiro Mochizuki 3-7-1 Fuchu, Iwatsuki City, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Office (72) Inventor Yoshihiro Maui In Iwatsuki City, Saitama Prefecture 3-7-1, Fuji Xerox Co., Ltd. Iwatsuki Office

Claims (5)

[Claims] 1. An ITU-T Recommendation V. 8 and V.I. 34. A communication terminal device having a function of performing communication based on a communication procedure according to claim 34, comprising: carrier down detecting means for detecting carrier down during communication with a calling station; and sending a common menu signal to the calling station. Control means for shifting a communication procedure to a line probing phase when a carrier down is detected by the carrier down detection means during the communication terminal apparatus. 2. An ITU-T Recommendation V. 8 and V.I. 34. A communication terminal device having a function of performing communication based on a communication procedure according to claim 34, comprising: carrier down detecting means for detecting carrier down during communication with a calling station; and sending a common menu signal to the calling station. If a carrier down is detected by the carrier down detecting means during the communication, the communication procedure is recommended. Control means for causing a fall back to a communication procedure according to claim 21. 3. The method according to ITU-T Recommendation V.3. 8 and V.I. 34. A communication terminal device having a function of performing communication based on a communication procedure according to 34, wherein a line probing signal for detecting a line probing signal transmitted from a calling station when a communication procedure of a line probing phase is started. Detection means, and control means for shifting a communication procedure to a line probing phase when a line probing signal is detected by the line probing signal detection means during transmission of a common menu signal to a calling station. Communication terminal device. 4. ITU-T Recommendation V. 8 and V.I. 34. A communication terminal device having a function of performing communication based on a communication procedure according to 34, wherein the communication terminal device is activated when a calling menu signal is received from a calling station and specifies a transmission time of a common menu signal by a timeout of a set time. And a control means for shifting a communication procedure to a line probing phase when the common menu signal transmission timer times out during transmission of the common menu signal to the calling station. Communication terminal device. 5. The method according to ITU-T Recommendation V.5. 8 and V.I. 34. A communication terminal device having a function of performing communication based on a communication procedure according to 34, wherein the communication terminal device is activated when a calling menu signal is received from a calling station and specifies a transmission time of a common menu signal by a timeout of a set time. And a communication procedure when the common menu signal transmission timer times out during transmission of the common menu signal to the calling station. Control means for causing a fall-back to a communication procedure according to claim 21.