JPH06268758A - Information transferring system - Google Patents

Abstract

PURPOSE:To reduce the time delay of the transmission of conference control information or telewriting information to be transmitted simultaneously with a facsimile original even if the frame length of facsimile original information is not set short. CONSTITUTION:At the time when the conference control information the telewriting information and the facsimile original information are transferred from communication conference terminal equipment 1 to the communication conference terminal equipment 2 by using Q922 (LAPE), if the output request of a conference information frame or a telewriting information frame is confirmed while the facsimile original information frame is being outputted to an ISDN line 28, the communication conference terminal equipment 1 interrupts immediately the output of the facsimile original information frame to the ISDN line 28, and outputs the conference information frame or the telewriting information frame to the ISDN line 28, and in respect of the facsimile original information whose transmission was interrupted, it retransmits it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information transfer system in a communication system for communicating voice, image information or other data.

[Prior art]

FIG. 21 is a diagram showing a configuration example of a communication system capable of performing conference communication and facsimile communication between two communication conference systems. The communication system of FIG. 21 has two communication conference systems SYS1 and SY.
S2 is connected by an ISDN line 28, VIDEO / CRTs 9, 10 are connected by video lines 6, 7 to the communication conference terminal devices 1, 2 of the systems SYS1, SYS2, respectively, and an extension G3 facsimile device 15 , 16 are connected by extension lines 12 and 13, respectively. Here, the ISDN line 28 serves as a basic interface of two B (for information transmission) channels and one D (for signal transmission) channels, for example. At this time, when conference communication is performed between the two communication conference terminal devices 1 and 2, two B channels are used. That is, one B channel is used to perform the exchange of audio information and the other one B channel is used to perform the exchange of video information.

[0003]

In the communication system configured as shown in FIG. 21, Q922 (LAPF) for conference control information, telewriting information, and facsimile manuscript information is transmitted from the communication conference terminal device 1 to the communication conference terminal device 2. Conventionally, when the facsimile original information frame is set to a long length of 2048 bytes when it is used for transfer, one frame of the facsimile original information is transmitted.
Communication transfer speed of MLP information channel is 6.4 kbp
It takes 2.56 seconds when s is set, and 1.14 seconds when the communication transfer speed of the MLP information channel is 14.4 kbps. That is, this is
If the frame length is set as long as 2048 bytes, when the conference control information frame and the telewriting information frame are transmitted at the same time, the communication transfer speed of the MLP information channel is increased for transmitting the conference control information and the telewriting information. There is a 2.56 second delay at 6.4 kbps and M
LP information channel communication transfer speed is 14.4 kbp
It means that a delay of 1.14 seconds occurs in s.

On the other hand, if the length of the facsimile manuscript information frame is set as short as 32 bytes, one frame of the facsimile manuscript information is transmitted by 0.04 when the communication transfer speed of the MLP information channel is 6.4 kbps.
It can be performed in seconds, and is 0.02 when the communication transfer speed of the MLP information channel is 14.4 kbps.
It can be done in seconds. That is, when the conference control information and the telewriting information frame are simultaneously transmitted, if the length of the facsimile manuscript information frame is set to be short, the conference information and the telephony information frame are set to be shorter than those when the frame is set to be long. It is possible to reduce the time delay of the writing information transmission. However, if the length of the facsimile original information frame is set to be short,
There have been problems that the number of times the facsimile document information frame is transmitted increases, the transmission of the facsimile document is delayed, and the load on the system of the communication conference terminal device increases.

The present invention provides an information transfer system capable of reducing the time delay of the transmission of conference control information and telewriting information transmitted at the same time as a facsimile document, without setting the frame length of the facsimile document information short. The purpose is to do.

[0006]

In order to achieve the above object, the invention as set forth in claim 1 provides a conference control information, a telewriting information, a plurality of conference control information among a plurality of communication conference systems.
This is an information transfer system capable of transferring facsimile original information via an ISDN line, and the transmitting side adds a data length as header information to the facsimile original information frame when outputting the facsimile original information frame to the ISDN line. Also, the facsimile manuscript information frame is
When the output request of the conference information frame or the telewriting information frame is confirmed while outputting to the DN line, the transmission side interrupts the output of the facsimile original information frame to the ISDN line and the conference information frame. The frame or telewriting information frame is output to the ISDN line, and the facsimile manuscript information frame whose transmission is interrupted is retransmitted. The receiving side receives the facsimile manuscript information frame from the transmitting side. At this time, the data length added as header information to the facsimile original information frame is compared with the data length of the actually received frame, and if they do not match,
The facsimile manuscript information frame is discarded. As described above, by preferentially handling the conference control information and the telewriting information, even when the facsimile original information frame length is set to be long, the conference control information and the telewriting information transmitted at the same time as the facsimile original information frame are transmitted. It is possible to reduce the occurrence of a situation where the transmission is delayed due to the facsimile document information frame.

The invention according to claim 2 is an information transfer system capable of transferring conference control information, telewriting information, and facsimile manuscript information between a plurality of communication conference systems via an ISDN line. When outputting a facsimile document information frame to an ISDN line, a data length is added as header information to the facsimile document information frame, and the facsimile document information frame is I
When the output request of the conference information frame or the telewriting information frame is confirmed while outputting to the SDN line, the transmitting side interrupts the output of the facsimile original information frame to the ISDN line and the conference information frame. The frame or telewriting information frame is output to the ISDN line, and the facsimile original information frame whose transmission has been interrupted is retransmitted from the interrupted data portion. When the facsimile original information frame is received, the data length added as header information to the facsimile original information frame is compared with the data length of the actually received frame. If they do not match, the received facsimile original information frame Holds the frame once and leaves the rest of the original fax to be retransmitted. In preparation for receiving the information frame, when the remaining facsimile manuscript information frame is retransmitted and received, the facsimile manuscript information frame is reconstructed using the held facsimile manuscript information frame, and the official facsimile manuscript information is reconstructed. It is designed to be received as a frame. As described above, by preferentially handling the conference control information and the telewriting information, even when the facsimile original information frame length is set to be long, the conference control information and the telewriting information transmitted at the same time as the facsimile original information frame are transmitted. It is possible to reduce the situation where the transmission is delayed due to the facsimile manuscript information frame, and since the interrupted frame is received as a formal frame without discarding it, the facsimile manuscript information is more You can send and receive efficiently.

The invention according to claim 3 is an information transfer system capable of transferring conference control information, telewriting information, and facsimile manuscript information between a plurality of communication conference systems via an ISDN line. , When outputting the facsimile manuscript information frame to the ISDN line,
When the output request of the conference information frame or the telewriting information frame is confirmed, the output of the facsimile document information frame to the ISDN line is interrupted, the abort signal is output, and then the abort signal is output. The writing information frame is output to the line, and the facsimile original information frame whose transmission has been interrupted is retransmitted. As described above, by preferentially handling the conference control information and the telewriting information, even when the facsimile original information frame length is set to be long, the conference control information and the telewriting information transmitted at the same time as the facsimile original information frame are transmitted. It is possible to reduce the situation in which the transmission is delayed due to the facsimile original information frame, and to perform the interruption processing of the facsimile original information frame without adding the data length as header information to the facsimile original information frame. Therefore, the facsimile original information can be transmitted and received more efficiently.

Further, the invention according to claim 4 is an information transfer system capable of transferring conference control information, telewriting information, and facsimile manuscript information between a plurality of communication conference systems via an ISDN line, and the transmitting side is When the facsimile original information frame is output to the ISDN line, the data length of the facsimile original information frame is dynamically changed according to the state of the telewriting application program. As a result, even when the conference control information and the telewriting information frame are transmitted at the same time as the facsimile manuscript information frame, these delays can be reduced and the facsimile manuscript information frame length is usually long. Does not need to be shortened.

The invention according to claim 5 is an information transfer system capable of transferring conference control information, telewriting information, and facsimile manuscript information between a plurality of communication conference systems via an ISDN line. CCITT Recommendation H when the data length of the facsimile manuscript information frame is output when the facsimile manuscript information frame is output to the ISDN line.
221 is dynamically changed according to the communication speed of the information channel 221. As a result, even when the conference control information and the telewriting information frame are transmitted at the same time as the facsimile manuscript information frame, these delays can be reduced and the facsimile manuscript information frame length is usually long. Does not need to be shortened.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a communication system according to the present invention. Referring to FIG. 1, the communication system includes 5
The communication conference systems SYS1 to SYS5 are connected to each other via a digital public line network (ISDN) 28. Each teleconference system SYS1, SYS
2 and SYS 3 have the same configuration, and the communication conference terminal devices 1, 2 and 3 are connected to the ISDN 28.

Further, each communication conference terminal device 1, 2, 3 has a function of displaying a moving image or the like via the moving image lines 6, 7, 8 such as displaying a conference material document or a facsimile document or other conference information. Display devices (for example, VIDEO / CRT) 9, 10 and 11 used for displaying the G.sub.3 and G.sub.3 via extension lines 12, 13, and 14, respectively.
Extensions G3 facsimile machines 15, 16 and 17 used for outputting document information received by facsimile communication and G4 facsimile communication, inputting conference material used in conference communication, and outputting other management information are connected, respectively. .

Further, the communication conference system SYS4, SYS
5, the video conference devices 18 and 19 are connected to the ISDN 28, and each of the video conference devices 18 and 19 has an RS2.
Communication conference terminal devices 4 and 5 dedicated to graphic operation are connected via 32C cables 20 and 21, and extension G3 facsimile device 24 is connected to each communication conference terminal device 4 and 5 via extensions 22 and 23. , 25 are connected.

The ISDN line 28 is used for G4 facsimile communication, G3 facsimile communication, conference communication (multimedia communication), etc.
It is the basic interface for the (information transmission) channel and one D (signal transmission) channel. In this case, 2
When conference communication is performed between two communication conference systems, two B channels of the ISDN line 28 are used. That is, one B channel is used to perform the exchange of audio information and the other one B channel is used to perform the exchange of video information.

Further, the communication conference terminal devices 1 to 3 of the systems SYS1 to SYS3 and the communication conference terminal devices 4 and 5 of the systems SYS4 to SYS5 have different functions as described later, but the communication conference terminal devices are different. The same hardware configuration can be used for 1 to 5. FIG. 2 is a schematic hardware configuration diagram of the communication conference terminal device 1, 2, 3, 4, or 5 used in the communication system of FIG. Referring to FIG. 2, a teleconference terminal device, eg, 1
Is a CPU 30 for controlling the whole, a DMA controller 32, an interrupt controller 34, a memory section 36 in which a control program of the CPU 30 and the like are stored, a display such as an LCD for displaying conference materials, facsimile originals, and other documents. Device (display) 37, a graphic controller 38 including, for example, a video RAM (VRAM), a writing pad 40 such as a touch panel used for operation of a communication conference terminal device, telewriting service during a conference, and the like, LAP
B (balanced link access procedure for B channel) unit 41
, The LAPF unit 42, the media multiplexer 43, and the L
APD (D channel link access procedure) unit 44
, ISDN interface 45, hard disk (HD) used for registering document information used in G3 facsimile communication, G4 facsimile communication, conference material used in conference communication, and other management information. ) 4
6, a keyboard 48, a modem 50, an HDLC 51
And an extension interface 52 and an RS23 used to output conference information during the conference to an external device.
2C interface 54, a video interface 58 used as an input / output interface for moving image information from an external device during the conference, a speaker 60 and a microphone 61 used for input / output of audio information during the conference The compression / expansion unit 62 is connected to the system bus 64. In this example, LAPB
Although the unit 41, the LAPF unit 42, and the LAPD unit 44 are configured by hardware, these functions may be configured by software.

In the communication conference terminal devices 1, 2, and 3 used for the systems SYS1, SYS2, and SYS3, a display device (for example, V, etc.) is provided as an external device on the moving image interface 58.
(IDE / CRT) 9, 10, 11 are connected,
In this example, no external device is connected to the RS232C interface 54. In addition, the system SYS4, S
In the communication conference terminal devices 4 and 5 used for the YS5, the RS232C interface 5 is used without connecting an external device such as VIDEO / CRT to the video interface 58.
External devices 18, 19 such as a video conference device are connected to the device 4. In this case, in the communication conference system, the communication conference terminal devices 4 and 5 do not realize media multiplex communication such as moving image information and audio information, and the display device 37 and the writing pad 4 are connected via the RS232C interface 54.
Only the graphic service using 0 is executed.

FIG. 3 is a diagram showing a software configuration example of the communication conference terminal device 1, 2, 3, 4 or 5, that is, a configuration example of a protocol stack on the communication conference terminal device. Referring to FIG. 3, the communication conference terminal device, for example, the protocol stack of 1, is a protocol stack on the D channel, a protocol stack on the B channel, a protocol stack on the extension interface 52, and an RS232.
It is composed of a protocol stack on the C interface 54.

[0018] Here, the protocol stack on the D channel satisfies the I430 layer 1 function of I430.
And a Q921 satisfying the LAP (link access procedure) function of the D channel layer 2 and a Q931 satisfying the function of the layer 3 of the D channel.

The protocol stack on the B channel satisfies the media multiplexing function H221 for realizing media multiplexing on the B channel, H242 for controlling the media multiplexing function H221, and G711 satisfying the voice coding function.
H261 that satisfies the image coding function, X75 that satisfies the layer 2 function on the B channel, Q922 core that satisfies the data multiplex transfer function, and L that conforms to Q921.
Q922 control that satisfies the AP control function, IS8208 that satisfies the layer 3 function on the B channel, and T70 and X22 that satisfies the layer 4 function on the B channel.
4 and T62 satisfying the functions of layer 5 on the B channel
And X225, T72 and X226 that satisfy the layer 6 function on the B channel, T30 that controls the G3 facsimile protocol, C & I as an application that controls the conference protocol, and an application that controls the telewriting protocol. As the application, BULK as an application for transferring information such as still image information and fax information in bulk, and G
It is composed of a G4 FAX as an application for controlling the 4 fax communication and a G3 FAX as an application for controlling the G3 fax communication.

The protocol stack on the extension interface 52 is composed of T30 for controlling the protocol of G3 facsimile and G3 FAX as an application for controlling G3 fax communication.

The protocol stack on the RS232C interface 54 has a Q922 core satisfying the data multiplex transfer function, a Q922 control satisfying the same LAP control function as Q921, and a layer 4 function on the B channel. X224 satisfying the above conditions, X225 satisfying the function of layer 5 on the B channel, X226 satisfying the function of layer 6 on the B channel, C & I as an application for controlling the conference protocol, and the telewriting protocol. As an application that controls
W and BULK as an application for transferring information such as still image information and fax information in bulk.

In such a configuration, the teleconference terminal device performs the G4 facsimile communication as shown in FIG.
In the protocol stack shown in, Q on the D channel
921, Q931, X75 on B channel, IS
8208, T70, T62, T72, G4FA
Use the X protocol stack. When executing G3 facsimile communication, in the protocol stack shown in FIG. 3, Q921 and Q93 on the D channel are used.
1, T30 on B channel, and G3 FAX protocol stack.

When inputting or outputting a document from the extension G3 facsimile apparatus, the communication conference terminal apparatus uses T30 on the extension interface and the G3 FAX protocol stack among the protocol stacks shown in FIG. Further, when executing the conference communication, H221 in the protocol stack shown in FIG.
, H242, G711, H261, Q922
, X224, X225, X226, C & I,
Uses TW and BULK protocol stacks.

Further, the communication conference terminal device sends the conference information to the R
When outputting to the S232C interface 54, in the protocol stack shown in FIG. 3, Q922, X224, X225, X226 on RS232C,
It uses the C & I, TW, and BULK protocol stacks. In addition, X226 below C & I application
, X225, X224, and Q922 are used to control overall data transfer during conference communication, and X226, X225, and X224 below the TW application are used.
, Q922 is used when executing the telewriting service during conference communication, and X226, X225, X224, and Q922 below the BULK application are used.
Is used when transferring conference materials during conference communication, transferring still image information, and other digital information.

Now, for example, the communication conference system SYS1
When performing conference communication from the communication conference system SYS2 to the communication conference system SYS2, first, the user of the communication conference terminal device 1 of the communication conference system SYS1 uses the input device such as the writing pad 40 and the keyboard 48 to communicate with the communication conference system SYS2.
The telephone number of the communication conference terminal device 2 is designated and a call is made by conference communication. In the communication conference terminal device 2 of the communication conference system SYS2, when there is an incoming call from the system SYS1,
The user of the communication conference system SYS2 is notified of the incoming call by outputting a ring tone from the speaker 60 or by displaying that there is an incoming call on the display 37. When the user of the communication conference system SYS2 answers the incoming call, the call is connected and the voice is opened.

Thereafter, when the user of the communication conference system SYS1 or the communication conference system SYS2 designates the transfer of the moving image information using the input device such as the writing pad 40 and the keyboard 48, and the call is made by the conference communication, the call is received. In the communication conference system SYS2 or the communication conference system SYS1 described above, for example, an incoming call of a moving image is displayed on the display 37 to automatically connect the call and open the moving image information.
After the above procedure is performed, the voice information and the moving image information are opened, and the conference is held between the users of the communication conference system SYS1 and the communication conference system SYS2.

During the conference communication, the communication conference system SYS1
And the user of the communication conference system SYS2, display 37,
Telewriting communication is performed using the writing pad 40, and the extension G3 facsimile device 15 (or 16) and the communication conference terminal device 1 (or communication conference terminal device 2) of the communication conference system SYS1 (or communication conference system SYS2) are used. Hard disk (HD) 46
It is possible to support the proceeding of the conference by reading the facsimile information or the still image information from the device and transferring it to the communication conference system SYS1 or the communication conference system 2.

For example, when transmitting the conference material from the communication conference system SYS1 to the communication conference system SYS2 during the conference, first, the user of the communication conference system SYS1 sends the extension G3 facsimile device 15 or the communication conference terminal device 1 (or the communication conference). Facsimile information and still image information are read from the hard disk (HD) 46 in the terminal device 2) and an appropriate title name is given to the conference material to be transmitted by using the input device such as the writing pad 40 and the keyboard 48. Then, the teleconference system SYS1
The user of the writing pad 40, keyboard 48
The transmission of the conference material is started by the conference communication to the communication conference system SYS2 using the input device such as. The communication conference system SYS2 stores the received conference material in the hard disk (HD) 46 of the communication conference terminal device 2.

When the conference material is thus transmitted and stored in the hard disk (HD) 46 of the communication conference terminal device 2 of the system SYS2, the communication conference system SYS.
1 and the communication conference system SYS2 have a common title name so that the conference material is displayed on the display 37 of the communication conference system SYS1 and the communication conference system SYS2.
Are displayed at the same time, or by executing a telewriting service, the system SYS1, S
With YS2, you can add and correct at the same time.

4 and 5 are diagrams showing a protocol sequence of conference communication in the communication conference terminal device. Figure 4,
Referring to FIG. 5, in order to conduct conference communication between the communication conference terminal device 1 of the system SYS1 and the communication conference terminal device 2 of the system SYS2, first, a call setting procedure for D channel (CCITT recommendation Q931 standard procedure) Is used to establish a conference communication call between the communication conference terminal device 1 and the communication conference terminal device 2. When a call is established between the communication conference terminal device 1 and the communication conference terminal device 2, the connection of the first channel is established (CCITT Recommendation H242 standard procedure phase A).

Then, the FAS / BAS signal is transmitted on the line using the first channel initialization procedure (CCITT recommendation H242 standard procedure) of the B channel (CCITT recommendation H242).
221 standard procedure), the capability exchange is performed between the communication conference terminal device 1 and the communication conference terminal device 2 (Phase B1). Here, the FAS signal is a signal used for frame synchronization of CCITT recommendation H221, and the BAS signal is a signal for transferring the command and data of CCITT recommendation H221.

Communication conference terminal device 1 and communication conference terminal device 2
In order to perform moving picture information communication between the communication conference terminal device 1 and the communication conference terminal device 2 after completing the initialization procedure of the first channel with the communication channel, first, the call setting procedure of the D channel (CC
A second conference communication call is established between the communication conference terminal device 1 and the communication conference terminal device 2 using the ITT Recommendation Q931 standard procedure). When the second call is established between the communication conference terminal device 1 and the communication conference terminal device 2, the connection of the additional channel (second channel) is established (CCITT recommendation H242 standard procedure phase CA).

Next, the FAS / BAS signal (CCITT recommendation H221 standard signal) is sent out on the line using the B channel additional channel initialization procedure (CCITT recommendation H242 standard procedure) to establish a communication conference with the communication conference terminal device 1. 56 kbps voice, 6.4 kbps ML with terminal device 2
P, set a transmission path for multimedia communication of 62.4 kbps video (Phase CB2). At this point, the communication conference terminal device 1 and the communication conference terminal device 2 have voice information,
The moving image information and the data information can be exchanged, and a conference can be held between the users of the communication conference terminal device 1 and the communication conference terminal device 2 (Phase C). During the conference communication, the users of the communication conference terminal device 1 and the communication conference terminal device 2 perform telewriting communication by using data information transfer,
Perform a fax communication, perform a still image transfer, or transfer other information to proceed with the conference.

FIG. 6 is a diagram showing a protocol sequence in the communication conference terminal device of the conference communication part (Phase C) shown in FIG. In FIG. 5, when the protocol sequence of the conference communication is executed in the communication conference terminal device, the communication conference terminal device 1 and the communication conference terminal device 2 are in the conference communication state. After entering the conference communication state, the communication conference terminal device 1 and the communication conference terminal device 2 generate a protocol stack for conference control and execute the protocol for conference control. Note that, in other words, the conference control protocol is C
& I, X226, X225, X224, Q92
It executes with the protocol stack of 2. Information on the protocol for conference control includes terminal identifier information, conference material information, conference participant information, and the like that prepares a conference environment between communication conference terminal devices.

After exchanging the above information, the start and end of telewriting communication, the start and end of fax communication (bulk transfer), the start and end of still image information (bulk transfer) are controlled. Control (phase D, E, CE).

FIG. 7 is a diagram showing an application protocol sequence for telewriting and fax transfer after the conference control protocol sequence shown in FIG. 6 is executed. After the communication conference terminal device 1 and the communication conference terminal device 2 are in the conference communication state, the conference control protocol sequence shown in FIG. 6 is activated and the conference control protocol is used to perform telewriting communication. When the protocol stack is generated, the teleconference terminal device 1 and the teleconference terminal device 2 perform telewriting communication by TW and X226.
, X225, X224, and Q922 protocol stacks. When the protocol stack for telerating communication and the protocol stack for facilitating communication are also generated by using the conference control protocol, the communication conference terminal device 1 and the communication conference terminal device 2 perform fax communication by BULK, X226, and X225 and X22
4 and Q922 protocol stack.

Conference control protocol and telewriting communication protocol stack and fax communication (bulk transfer)
The protocol stack is protocol-multiplexed at Q922 of the protocol stack shown in FIG. 3, and is transferred by one MLP on the ISDN 28. Further, the priority order of data transfer is set in each protocol stack. Usually, real-time data conference control communication and telewriting communication have a high priority, and bulk data fax communication and still image communication have a low priority. By thus setting the priorities, bulk system data transfer can be executed without disturbing real-time system data transfer.

In the above example, the case where the conference material is transmitted during the conference is described, but the conference material is transferred from the communication conference system 1 to the communication conference system 2 in advance before the conference is held. It is also possible to send.
In this case, first, an appropriate title name is given to the conference material to be transmitted by the same procedure as described above. Thereafter, the user of the communication conference system SYS1 designates the telephone number of the device 2 of the communication conference system SYS2 by using the input device such as the writing pad 40 and the keyboard 48, and makes a call by G4 fax communication. The called communication conference system SYS2 automatically responds to the call, and when the call is connected, the communication conference system SYS1 starts transmitting the conference material. The communication conference system SYS2 receives the transmitted conference material and stores it in a hard disk (H
D) Store in 46. In this way, prior to the holding of the conference meeting, the communication conference system SYS1 and the communication conference system SYS2 can have the conference material with a common title, and the conference material distributed in advance during the conference communication can be stored. Communication conference system SYS1 and communication conference system S
By simultaneously displaying on the display 37 of YS2 or executing a telewriting service, it is possible to simultaneously add and correct.

FIG. 8 is a diagram showing a conference material transmission protocol sequence in G4 facsimile communication in the communication conference terminal device. In order to previously transmit the conference material used in the conference communication between the communication conference terminal device 1 and the communication conference terminal device 2, first, the D channel call setup procedure (CCITT
Recommendation Q931 standard procedure)
When a call is established between the communication conference terminal device 2 and the communication conference terminal device 2, data transfer of the B channel is started. That is, after establishing a call for the D channel, the communication conference terminal device 1 first sends a SABME command to the B channel to request the setting of the link layer. Upon receiving the SABME command, the communication conference terminal device 2 returns a UA response as a response. As a result, the link layer is set.

After setting the link layer, the communication conference terminal device 1
Sends an SQ command to the B channel. Upon receiving the SQ command, the communication conference terminal device 2 returns an SF response as a response. Upon receiving the SF response, the communication conference terminal device 1 sends a CR command to the B channel to request the network layer setting. The communication conference terminal device 2 receives the CR command and returns a CA response as a response. This sets the network layer.

After setting the network layer, the communication conference terminal device 1 sends a TCR command to the B channel to request the setting of the trans layer. Communication conference terminal device 2
Receives a TCR command and returns a TCA response as a response. As a result, the translayer is set. After setting the trans layer, the communication conference terminal device 1
Send a CSS command to the channel to request session layer connection setup. Communication conference terminal device 2
Receives a CSS command and returns an RSSP response as a response. As a result, the session layer connection is set. After setting the connection in the session layer, the reception capability is exchanged between the devices 1 and 2.
That is, it is set that the communication conference terminal device 1 is capable of executing the conference material communication function in order to perform the negotiation of the transmission function used in communication.
Send CL command to B channel. Upon receiving the CDCL command, the communication conference terminal device 2 returns, as a response, the RDCLP response in which it is set that the conference material can be received.

In this way, when the preparation for transmitting the conference material is completed, the communication conference terminal device 1 transmits the CDS command in which the document management information for distinguishing the document to be transmitted is set. Then, the communication conference terminal device 1 transmits the image information of one document sentence by using the CDUI command. The title name of the conference material is set in the document profile in the CDUI command in which the beginning of the document is stored. After transmitting the CDUI command, the communication conference terminal device 1 sends out a CDE command for notifying the end of the document, and finishes transmitting the image information of one document sentence.

Here, the communication conference terminal device 2 is C
The DS command and the CDUI command are received, and the image information of one document sentence is stored in the hard disk (HD) 46. At this time, the communication conference terminal device 2 confirms the title name of the conference material in the document profile in the CDUI command in which the beginning of the document is stored. HD). In this way, when the reception of the CDUI command is completed, the communication conference terminal device 2 confirms the document delivery. That is, the command CDE is received, and RDEP is returned as a response. Thereafter, the upper layer of the B channel is disconnected, the call of the D channel is released, and the session layer connection, network layer and link layer are released. By executing the conference material transmission by the G4 facsimile communication in such a procedure, the communication conference terminal device 1 and the communication conference terminal device 2 can have the conference material having a common title name.

Further, for example, the communication conference system SYS1
In the case where a facsimile original is transmitted from the communication conference system SYS2 to the communication conference system SYS2 (that is, when the conference communication is not being performed), the user of the communication conference system SYS1 first needs the extension G3 facsimile device 15
Alternatively, the facsimile information is read from the hard disk (HD) 46 in the device 1. After that, the telephone number of the communication conference system SYS2 is designated by using the input device such as the writing pad 40 and the keyboard 48, and the system SYS2 is called by the G4 fucksimili communication or the G3 fasimili communication. When there is an incoming call from the system SYS1, the communication conference system SYS2 automatically responds to the call, and when the call is connected, the communication conference system SYS1 starts the transmission of the facsimile document. In the communication conference system SYS2, the received facsimile document is stored in the hard disk (HD) 46, and the system SYS
After the communication with S1 is completed, the communication conference system 2 outputs the received facsimile document to the G3 facsimile device 16.

In the above example, the facsimile original is transmitted and received when the conference communication is not performed.
In the communication system of, the facsimile document can be transmitted from the system SYS1 to the system SYS2 during the conference (that is, when the conference communication is stopped) as follows. That is, the user of the communication conference system SYS1 first causes the extension G3 facsimile device 15 or the hard disk (HD) 46 to read the facsimile information. Thereafter, the communication conference system SYS1 transmits the conference material to the communication conference system SYS2 by conference communication, and the communication conference system SYS2
Then, the received conference material is stored in the hard disk (HD). After the end of this communication, the communication conference system SYS2
Outputs the received facsimile document to the G3 facsimile device 16. In this way, facsimile originals can be transmitted and received together with conference materials.

By the way, in the present invention, for example, the system SY
When transmitting conference control information and telewriting information from S1 to the system SYS2 at the same time as a facsimile document, time delay of transmission of conference control information and telewriting information without setting the information frame length of the facsimile document short. It is intended to reduce the amount.

FIG. 9 shows the communication conference systems SYS1 and SYS.
The conference control information, the telewriting information, and the facsimile manuscript information are transmitted between the two teleconference terminal devices 1 and 2 of Q922 (L
It is a figure which shows the environment at the time of transferring using APF). Referring to FIG. 9, information transfer between the devices 1 and 2 is as follows.
Basically, the operation of Q922 (LAPF) and the sending side A
The operation of the P (application) and the operation of the receiving AP (application) are required. Where AP
An (application) is a protocol stack of layer 3 or higher located on LAPF, that is, X224, X225, X226 in the software configuration shown in FIG.
Means a protocol stack such as.

In the first to fifth embodiments described below, LAPF is used from the device 1 to the device 2 in the environment as shown in FIG. 9 so that conference control information, telewriting information, and facsimile manuscript information can be displayed. The case of transferring data will be described.

First, in the first embodiment of the present invention, the conference control information is transmitted from the communication conference terminal device 1 to the communication conference terminal device 2.
Q92 for telewriting information and facsimile manuscript information
When the facsimile original information frame is being output to the ISDN line 28 during transfer using 2 (LAPF), and the output request of the conference information frame or the telewriting information frame is confirmed, the communication conference terminal device 1 is the IS of the facsimile manuscript information frame immediately.
The output to the DN line 28 is interrupted and the conference information frame or telewriting information frame is sent to the ISDN line 28.
The facsimile manuscript information frame whose output has been interrupted and whose transmission has been interrupted is retransmitted. The communication conference terminal device 1 adds a data length as header information to the facsimile document information frame when outputting the facsimile document information frame to the ISDN line 28, and the communication conference terminal device 2 uses the facsimile document information frame. When a frame is received, the data length added as header information to the facsimile document information frame is compared with the data length of the actually received frame. If they do not match, the facsimile document information frame is discarded. Has become.

In the first embodiment, the AP protocol stack is not limited to the protocol stack such as X224, X225, X226 in the software configuration shown in FIG. That is, generally X224, T
Since the layer 4 protocol stack such as 70 manages the length of data, a conventional protocol stack may be used, or a non-standard layer program may be used.

Next, the operation of the first embodiment having such a configuration will be described with reference to FIGS. 10 is a flowchart showing the processing operation of the LAPF of the communication conference terminal apparatus 1 as the transmission side apparatus, and FIG. 11 is a flowchart showing the processing operation of the AP of the communication conference terminal apparatus 2 as the reception side apparatus.

First, referring to FIG. 10, in the LAPF section 42 of the communication conference terminal device 1 on the transmitting side, after the line output processing of the LAPF frame is started, it is judged whether or not the frame being line output is a facsimile original information frame. Yes (step S1). If it is not the facsimile manuscript information frame, it waits until the transmission of the LAPF frame is completed (step S7), and after the transmission of the LAPF frame is completed, the line output processing of the LAPF frame is ended. On the other hand, if it is determined in step S1 that the frame being output on the line is the facsimile document information frame, the C & I
During transmission of the facsimile original information frame, it is monitored whether there is an information frame transmission request, a telewriting (TW) information frame transmission request, or whether the LAPF frame transmission is completed (steps S2, S3).
S4). In this monitoring, when the transmission request of the C & I information frame or the telewriting information frame is confirmed, the transmission of the facsimile manuscript information frame is terminated halfway, and the retransmitted interrupted facsimile manuscript information frame is registered in the system. (Step S5). After that, the line output of the C & I information frame or the telewriting information frame is started (step S6), and the LAP
Wait for completion of transmission of F frame (step S
7).

Further, referring to FIG. 11, the AP of the communication conference terminal device 2 first determines whether or not the reception of the facsimile document information frame has ended after the reception of the facsimile document information frame (step S11). If the reception is not completed, the reception of one frame of the facsimile manuscript information is awaited (step S12), and when one frame of the facsimile manuscript information is received, the data length actually added to the facsimile manuscript information frame as header information and The data length of the received frame is compared (step S13). If the result of this comparison is that they do not match, the facsimile manuscript information frame is discarded (step S
14) If they match, the upper frame is notified of the facsimile document information frame (step S15).

FIG. 12 is a diagram showing a specific example of the operation of the first embodiment. Referring to FIG. 12, the communication conference terminal device 1
Uses the 6.4 kbps MLP information channel,
For example, a facsimile original information frame is output to the ISDN line 28 in units of 2048 bytes and sent to the communication conference terminal device 2. The LAPF unit 42 of the communication conference terminal device 1
In this way, while the facsimile manuscript information frames are sequentially output to the line, while the facsimile manuscript information frame FAX 7 is being output, for example, telewriting (T
W) When the output request of the information frame is confirmed, the telewriting (TW) information frame is preferentially transmitted.
Immediately interrupt the line output of the facsimile document information frame FAX7. In the example of FIG. 12, the facsimile original information frame FAX is transmitted when, for example, 1034 bytes are transmitted.
7 is interrupted, and the telewriting (TW) information frame is output to the ISDN line 28. When the transmission of all the telewriting information frames is completed, the communication conference terminal device 1 starts the retransmission of the previously interrupted facsimile original information frame FAX7. That is,
Retransmit FAX 7 from the beginning.

Further, the AP (application) of the communication conference terminal device 1 has a data length as header information in the facsimile document information frame so that the validity of the facsimile document information frame received by the receiving communication conference terminal device 2 can be confirmed. LI, in this case, 2048 bytes are added.

On the other hand, when the AP of the communication conference terminal device 2 receives the facsimile document information frame, the data length LI (2048 bytes) added as header information to the facsimile document information frame and the data of the frame actually received. Compare with the long. In the present case, the data length of the actually received frame of the previously received facsimile original information frame FAX7 is 1034 bytes, which does not match 2048 bytes. Is discarded.

As described above, in the first embodiment, the conference control information and the telewriting information are preferentially handled so that even when the facsimile original information frame length is set as long as 2048 bytes, the facsimile original information frame is set. −
It is possible to reduce a situation in which the transmission of the conference control information and the telewriting information transmitted at the same time as the frame is delayed due to the facsimile document information frame.

In the second embodiment of the present invention, while outputting the facsimile manuscript information frame to the line, the output request of the conference information frame or the telewriting information frame is confirmed and the facsimile manuscript information frame is output to the line. When the processing is interrupted, the processing for the interrupted facsimile document information frame is different from that of the first embodiment. That is, in the second embodiment, when the facsimile document information frame is interrupted during line output, the communication conference terminal device 1 retransmits from the interrupted data portion. Further, the communication conference terminal device 1 is
Similar to the first embodiment, when outputting the facsimile manuscript information frame to the ISDN line 28, a data length is added as header information to the facsimile manuscript information frame, and the communication conference terminal device 2 sets the facsimile manuscript information frame. The data length added to the facsimile original information frame as header information is compared with the data length of the actually received frame. When the comparison result does not match, the communication conference terminal device 2
Stores the received facsimile manuscript information frame in the memory and prepares for reception of the remaining facsimile manuscript information frame to be retransmitted. When the remaining facsimile manuscript information frame is retransmitted and received, the facsimile manuscript information frame is received. The information frame is reconstructed and received as a formal facsimile manuscript information frame.

In the second embodiment, the AP protocol stack is a non-standard layer program, which is LAPF.
And the one located between X224 and X224 is used. However, X
224 or more may be omitted.

Next, the operation of the second embodiment having such a configuration will be described with reference to FIG. 13. FIG. 13 is a flowchart showing the processing operation of the AP of the communication conference terminal device 2 as the receiving side device.

Referring to FIG. 13, the communication conference terminal device 2
After the start of receiving the facsimile manuscript information frame,
It is determined whether or not the reception of the facsimile manuscript information frame is completed (step S21). If the reception is not completed, the reception of one frame of the facsimile manuscript information is awaited (step S22), and when one frame of the facsimile manuscript information is received, the data length actually added to the facsimile manuscript information frame as header information and The data length of the received frame is compared (step S2).
3). If the result of this comparison is that they do not match, the facsimile manuscript information frame is stored in the AP (step S24), and the reception of the remaining one frame of facsimile manuscript information is awaited (step S25). When one frame of the remaining facsimile manuscript information is received, the facsimile manuscript information frame is reconstructed, and the sum of the data length of the previously received facsimile manuscript information frame and the received data length of the remaining facsimile manuscript information frame is the header. It is determined whether or not it matches the data length added to the information (step S26). As a result, if they match, the facsimile document information frame is notified to the upper layer (step S2).
7). If they do not match, the facsimile document information frame is stored in the AP, and the reception of the remaining one frame of facsimile document information is waited until the data lengths match (steps S25 and S26).

FIG. 14 is a diagram showing a specific example of the operation of the second embodiment. Referring to FIG. 14, the communication conference terminal device 1
Uses the 6.4 kbps MLP information channel,
For example, a facsimile original information frame is output to the ISDN line 28 in units of 2048 bytes and sent to the communication conference terminal device 2. The LAPF unit 42 of the communication conference terminal device 1
When the facsimile original information frame FAX7 is being output and the output request of the telewriting (TW) information frame is confirmed while the facsimile original information frames are sequentially output to the line, the telewriting (TW) information frame is given priority. The line output of the facsimile manuscript information frame is immediately interrupted because it is sent to the. In the example of FIG. 14, the transmission of the facsimile document information frame FAX7 is interrupted at the time when, for example, 1034 bytes are transmitted, and the telewriting (TW) information frame is output to the ISDN line 28. When the transmission of all the telewriting information frames is completed, at that point, the communication conference terminal device 1 starts the retransmission of the previously interrupted facsimile document information frame FAX7 from the interrupted data portion. That is, the transmission of the remaining 1014 bytes of FAX 7 is started.

Further, the AP (application) of the communication conference terminal device 1 uses header information in the facsimile document information frame as header information so that the validity of the received facsimile document information frame can be confirmed in the receiving communication conference terminal device 2. Data length LI (in this case, 2048
Byte) is added. When receiving the facsimile document information frame, the AP of the communication conference terminal device 2 compares the data length LI (2049 bytes) added as header information to the facsimile document information frame with the data length of the actually received frame. . In the present case, the data length of the first received frame is 1034 bytes,
Since it does not match 2048 bytes, device 2
A 34-byte facsimile document information frame is stored in the AP to prepare for reception of the remaining facsimile document information frame to be retransmitted. The remaining 1 from the teleconference terminal device 1
When the 014-byte facsimile manuscript information frame is retransmitted and is received, the AP of the communication conference terminal device 2 is sent.
Reconstructs the facsimile manuscript information frame with the previously received 1034 byte frame and the now received 1014 byte frame, and receives it as a 2048 byte official facsimile manuscript information frame.

As described above, in the second embodiment, by preferentially handling the conference control information and the telewriting information, even when the facsimile original information frame length is set as long as 2048 bytes, the facsimile original information frame is set. It is possible to reduce the occurrence of a situation in which the transmission of conference control information and telewriting information transmitted at the same time as the frame is delayed due to the facsimile manuscript information frame.
Since the interrupted frame is received as a formal frame without discarding it, the facsimile original information can be transmitted and received more efficiently.

In the third embodiment of the present invention, the data length L is used as header information in the facsimile document information frame.
The process of interrupting the facsimile document information frame is performed without adding I. That is, in the third embodiment, when the communication conference terminal device 1 confirms the output request of the conference information frame or the telewriting information frame while outputting the facsimile document information frame to the ISDN line 28, Immediately, the output of the facsimile document information frame to the ISDN line 28 is interrupted to output an ABORT signal. After outputting the ABORT signal, the conference information frame or the telewriting information frame is output. The facsimile manuscript information frame output to the line and the transmission of which is interrupted is retransmitted.

Next, the operation of the third embodiment having such a configuration will be described with reference to FIG. Note that FIG. 15 is a flowchart showing the processing operation of the LAPF unit 42 of the communication conference terminal device 1 as the transmission side device.

Referring to FIG. 15, the LAPF unit 42 of the communication conference terminal device 1 on the transmitting side, after starting the line output processing of the LAPF frame, determines whether or not the frame being line-output is a facsimile document information frame ( Step S3
1). L if not a facsimile manuscript information frame
Wait until the transmission of the APF frame is completed (step S
37), after the LAPF frame transmission is completed, the line output processing of the LAPF frame is ended. On the other hand, step S
If it is determined in 31 that the frame being output on the line is the facsimile manuscript information frame, a telewriting (T
W) Whether or not there is a request to send an information frame or whether the LAPF frame has been sent is monitored while sending the facsimile document information frame (steps S32, S33,
S34). In this monitoring, when the transmission request of the C & I information frame or the telewriting information frame is confirmed, the transmission of the facsimile manuscript information frame is terminated halfway and an abort signal is sent to the ISDN line 28 to interrupt the facsimile manuscript. The retransmission of the information frame is registered in the system (step S35). Then C
The line output of the & I information frame or the telewriting information frame is started (step S36), and the completion of the transmission of the LAPF frame is awaited.

FIG. 16 is a diagram showing a specific example of the operation of the third embodiment. Referring to FIG. 16, the communication conference terminal device 1
Uses the 6.4 kbps MLP information channel,
For example, a facsimile original information frame is output to the ISDN line 28 in units of 2048 bytes and sent to the communication conference terminal device 2. The LAPF unit 42 of the communication conference terminal device 1
When the facsimile original information frame FAX7 is being output and the output request of the telewriting (TW) information frame is confirmed while the facsimile original information frames are sequentially output to the line, the telewriting (TW) information frame is given priority. In this case, the line output of the facsimile manuscript information frame is immediately interrupted and the abort (A
BORT) signal is transmitted. In the example of FIG. 16, 1034
When the byte is sent out, the abort signal is sent and the telewriting (TW) information frame is output to the line. The teleconference terminal device 1 uses the telewriting (T
W) When the transmission of all the information frames has been completed, the retransmission of the facsimile original document information frame FAX7, which was suspended previously, is started. That is, FAX 7 is transmitted again from the beginning.

On the other hand, the LAPF unit 4 of the communication conference terminal device 2
When the abort signal is detected during the reception of the facsimile original information frame, the reference numeral 2 discards the facsimile original information frame. In the present case, 103 sent earlier
Since the abort signal was transmitted when the 4-byte facsimile original information frame was interrupted, this 1034
The facsimile original information frame FAX7 of bytes is discarded. As described above, in the third embodiment, the conference control information and the telewriting information are preferentially handled, so that even when the facsimile original information frame length is set as long as 2048 bytes, the facsimile original information frame and the facsimile original information frame are set. It is possible to reduce a situation in which the transmission of the conference control information and the telewriting information transmitted at the same time is delayed due to the facsimile document information frame.
Since the interruption processing of the facsimile original information frame can be performed without adding the data length LI as the header information to the facsimile original information frame, the facsimile original information can be transmitted and received more efficiently.

Further, in the fourth embodiment of the present invention, the conference control information is transmitted from the communication conference terminal device 1 to the communication conference terminal device 2.
Q92 for telewriting information and facsimile manuscript information
2 (LAPF), the data length of the facsimile document information frame is dynamically changed in the communication conference terminal device 1 according to the state of the telewriting application program. ing. Specifically, when the telewriting application program is started, the telewriting writing program is started, or a program expected to be written is started, the facsimile original information frame If the telewriting application program ends or the telewriting writing program ends while the data length is set to a short length, or if the writing expected program ends, the facsimile original The data length of the information frame is set to be long.

Next, the operation of the fourth embodiment having such a configuration will be described with reference to FIG. Note that FIG. 17 is a flowchart showing the processing operation of the LAPF unit 42 of the communication conference terminal device 1 which is the transmission side device.

Referring to FIG. 17, the communication conference terminal device 1
Is a telewriting (TW) application program (AP) after the LAPF FAX information transfer process is started.
Is started (steps S41, S
42). As a result, the application program (A
If P) is active, the data length of the facsimile document information frame is set to 256 bytes (step S4).
3) LA output request for facsimile manuscript information frame
It is issued to the PF unit 42 (step S45). On the other hand, when the telewriting application program is not activated, the data length of the facsimile manuscript information frame is set to 2048 bytes (step S4).
4) LA request for output of facsimile manuscript information frame
It is issued to the PF unit 42 (step S45).

FIG. 18 is a diagram showing a specific example of the operation of the fourth embodiment. Referring to FIG. 18, the communication conference terminal device 1
Uses the 6.4 kbps MLP information channel,
For example, the facsimile manuscript information frame is output to the ISDN line 28 in units of 2048 bytes and sent to the communication conference terminal device 2. LAPF unit 42 of communication conference terminal device 1
Is the fax original information frame when the telewriting application program is not running.
The FAX 1 to FAX 6 are transmitted to the line with a data length of 2048 bytes. At this time, when the telewriting (TW) application program is activated, the apparatus 1 dynamically changes the data length of the facsimile manuscript information frame from 2048 bytes to 256 bytes, and the telewriting (TW) information frame. Transmission of facsimile and facsimile manuscript information frame FAX7 with a data length of 256 bytes
The FAX 9 transmission is executed at the same time. After that, when the telewriting application program ends in the communication conference terminal device 1, the data length of the facsimile document information frame is dynamically changed from 256 bytes to 2048 bytes.

As described above, in the fourth embodiment, the data length of the facsimile document information frame is dynamically changed according to the state of the telewriting application program. Even when the conference control information and the telewriting information frame are transmitted at the same time as the frame, these delays can be reduced, and normally the facsimile original information frame length need not be shortened.

Further, in the fifth embodiment of the present invention, the conference control information is transmitted from the communication conference terminal device 1 to the communication conference terminal device 2.
Q92 for telewriting information and facsimile manuscript information
2 (LAPF), the data length of the facsimile manuscript information frame in the communication conference terminal device 1 is set to the information channel (MLP, HSD, LS) of H221.
It is adapted to be dynamically changed according to the communication speed of D). Specifically, when the communication speed of the H221 information channels (MLP, HSD, LSD) is fast, the data length of the facsimile original information frame is set to be long, and the H221 information channels (MLP, HSD, L
When the communication speed of SD) is slow, the facsimile document information frame length is set to be short.

FIG. 19 is a flow chart showing the operation of the FAX application of the transmission side communication conference terminal device 1 in the fifth embodiment. Referring to FIG. 19, the communication conference terminal device 1 starts the LAPF FAX information transfer process,
For example, the data length of the facsimile manuscript information frame is determined based on the communication speed of the MLP information channel (steps S51 and S52). Facsimile manuscript information frame
When the data length of the frame is determined, an output request for the facsimile document information frame is issued to LAPF (step S5).
3).

FIG. 20 is a diagram showing a specific example of the operation of the fifth embodiment. Referring to FIG. 20, the communication conference terminal device 1
Uses the 6.4 kbps MLP information channel,
For example, the facsimile manuscript information frame is output to the ISDN line 28 in units of 2048 bytes and sent to the communication conference terminal device 2. LAPF unit 42 of communication conference terminal device 1
If the communication transfer speed of the MLP information channel becomes slow due to transmission of telewriting information during transmission of the facsimile manuscript information frame over the line, the data length of the facsimile manuscript information frame is changed from 2048 bytes to 25 bytes.
Dynamically changing to 6 bytes, the transmission of the telewriting information frame and the transmission of the 256-byte facsimile manuscript information frame are simultaneously executed. When the transmission of the telewriting information frame is completed, the communication transfer speed of the MLP information channel becomes faster, so the communication conference terminal device 1 dynamically changes the facsimile original information frame length from 256 bytes to 2048 bytes.

As described above, in the fifth embodiment, the data length of the facsimile original information frame is dynamically changed according to the passing speed of the information channel of H221. Therefore, the facsimile original information frame is changed. At the same time, even when the conference control information and the telewriting information frame are transmitted, these delays can be reduced, and normally the facsimile original information frame length does not have to be shortened.

In the fourth and fifth embodiments, the data length of the facsimile manuscript information frame does not indicate the maximum packet size of layer 3 or the maximum transport block size. It is assumed that the maximum packet size and the maximum transport block size are negotiated with 2048 bytes or more so as not to affect the facsimile original information frame length shown in the present invention. Therefore, the facsimile document information frame shown in the present invention is
The data length of the system can be variably set within 2048 bytes depending on the application.

[0080]

As described above, according to the invention described in claim 1, even when the facsimile original information frame length is set long by preferentially handling the conference control information and the telewriting information, Facsimile manuscript information frame
It is possible to reduce a situation in which the transmission of the conference control information and the telewriting information transmitted at the same time as the frame is delayed due to the facsimile document information frame.

According to the second aspect of the present invention, by preferentially handling the conference control information and the telewriting information, even when the facsimile original information frame length is set to be long, the facsimile original information frame and the facsimile original information frame are set. It is possible to reduce a situation in which the transmission of the conference control information and the telewriting information transmitted at the same time is delayed by the facsimile original information frame, and it is possible to use the formalized frame without discarding the interrupted frame. Since it is received as a frame, the facsimile original information can be transmitted and received more efficiently.

According to the third aspect of the present invention, by preferentially handling the conference control information and the telewriting information, even when the facsimile original information frame length is set to be long, the facsimile original information frame and the facsimile original information frame are set. It is possible to reduce the situation where the transmission of the conference control information and the telewriting information transmitted at the same time is delayed by the facsimile manuscript information frame, and the data length is not added to the facsimile manuscript information frame as header information. Since the facsimile original information frame can be interrupted, the facsimile original information can be transmitted and received more efficiently.

According to the invention described in claim 4, even when the conference control information or the telewriting information frame is transmitted at the same time as the facsimile document information frame, these delays can be reduced. In addition, it is usually not necessary to shorten the length of the facsimile document information frame.

According to the fifth aspect of the invention, even when the conference control information and the telewriting information frame are transmitted at the same time as the facsimile document information frame, these delays can be reduced. In addition, it is usually not necessary to shorten the length of the facsimile document information frame.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a communication system according to the present invention.

FIG. 2 is a schematic hardware configuration diagram of a communication conference terminal device used in the communication system of FIG.

FIG. 3 is a diagram showing a software configuration example of a communication conference terminal device used in the communication system of FIG.

FIG. 4 is a diagram showing a protocol sequence of conference communication in a communication conference terminal device.

FIG. 5 is a diagram showing a protocol sequence of conference communication in the communication conference terminal device.

FIG. 6 is a diagram showing a conference control protocol sequence in the communication conference terminal device.

FIG. 7 is a diagram showing an application protocol sequence after the conference control protocol sequence shown in FIG. 6 is executed.

FIG. 8 is a diagram showing a conference material transmission protocol in G4 facsimile communication in a communication conference terminal device.

FIG. 9 is a diagram showing an environment in which conference control information, telewriting information, and facsimile manuscript information are transferred between communication conference terminal devices of two communication conference systems using Q922 (LAPF).

FIG. 10 is a LAP of the transmission side apparatus according to the first embodiment of this invention.
It is a flowchart which shows the processing operation of F.

FIG. 11 is a flowchart showing an AP processing operation of the transmission-side apparatus according to the first embodiment of this invention.

FIG. 12 is a diagram showing a specific example of the operation of the first exemplary embodiment of the present invention.

FIG. 13 is a flowchart showing a processing operation of the AP according to the second embodiment of the present invention.

FIG. 14 is a diagram showing a specific example of the operation of the second exemplary embodiment of the present invention.

FIG. 15 is a LAP of a transmitting side apparatus according to a third embodiment of the present invention.
8 is a flowchart showing the processing operation of F.

FIG. 16 is a diagram showing a specific example of the operation of the third exemplary embodiment of the present invention.

FIG. 17 is a LAP of the transmission side apparatus according to the fourth embodiment of the present invention.
8 is a flowchart showing the processing operation of F.

FIG. 18 is a diagram showing a specific example of the operation of the fourth exemplary embodiment of the present invention.

FIG. 19 is a flowchart showing the FAX application operation of the communication conference terminal device on the transmitting side in the fifth embodiment of the present invention.

FIG. 20 is a diagram showing a specific example of the operation of the fifth exemplary embodiment of the present invention.

FIG. 21 is a diagram for explaining a conventional communication system.

[Explanation of symbols]

1, 2, 3, 4, 5 Communication conference terminal device 6, 7, 8 Video line 9, 10, 11 Display device 12, 13, 14, 22, 23 Extension 15, 16, 17, 24, 25 Extension facsimile device 18 , 19 Video conferencing equipment 20, 21 RS232C case
Bull 26, 27, 29 External facsimile 28 ISDN line 30 CPU 32 DMA controller
La 34 interrupt controller 36 memory unit 37 display unit 38 graphic controller 40 writing pad 41 LABP unit 42 LAPF unit 43 media multiplexer 44 LAPD unit 45 ISDN interface
Face 46 Hard Disk (HD) 48 Keyboard 50 Modem 51 HDLC 52 Extension Interface 54 RS232C Interface 58 Video Interface 60 Speaker 61 Microphone 62 Compression / decompression unit 64 System bus SYS1 to SYS5 Communication conference system

Claims (5)

[Claims] 1. An information transfer system capable of transferring conference control information, telewriting information, and facsimile manuscript information between a plurality of communication conferencing systems via an ISDN line.
Facsimile manuscript information frame when outputting to N line
When a request is made to output a conference information frame or a telewriting information frame while the facsimile original information frame is being output to the ISDN line, the sender side The output of the facsimile original information frame to the ISDN line is interrupted, the conference information frame or the telewriting information frame is output to the ISDN line, and the facsimile original information frame whose transmission is interrupted is retransmitted. When the facsimile document information frame from the transmitting side is received, the receiving side compares the data length added as header information in the facsimile document information frame with the data length of the actually received frame, and the two match. If not, discard the facsimile manuscript information frame. Information transfer system, characterized that it is so. 2. An information transfer system capable of transferring conference control information, telewriting information, and facsimile manuscript information between a plurality of communication conference systems via an ISDN line.
The transmitting side adds a data length as header information to the facsimile manuscript information frame when outputting the facsimile manuscript information frame to the ISDN line, and the conference information frame or the conference information frame when the facsimile manuscript information frame is output to the ISDN line. When the output request of the telewriting information frame is confirmed, the transmission side interrupts the output of the facsimile manuscript information frame to the ISDN line, outputs the conference information frame or the telewriting information frame to the ISDN line, and transmits. The interrupted facsimile original information frame is retransmitted from the interrupted data portion, and when the receiving side receives the facsimile original information frame from the transmitting side, the facsimile original information frame is received. Attached as header information to The received data length is compared with the data length of the actually received frame, and if they do not match, the received fax document information frame is once held and the remaining fax document information frame to be retransmitted is stored. In preparation for reception, when the remaining facsimile manuscript information frame is retransmitted and received, the facsimile manuscript information frame is reconstructed using the held facsimile manuscript information frame and received as a formal facsimile manuscript information frame. An information transfer method characterized by being adapted to do so. 3. An information transfer system capable of transferring conference control information, telewriting information, and facsimile manuscript information between a plurality of communication conference systems via an ISDN line.
If the transmission side confirms the output request of the conference information frame or the telewriting information frame while outputting the facsimile manuscript information frame to the ISDN line, it suspends the output of the facsimile manuscript information frame to the ISDN line. To output the abort signal, output the abort signal, then output the conference information frame or the telewriting information frame to the line, and retransmit the facsimile manuscript information frame whose transmission has been interrupted. An information transfer method characterized in that 4. An information transfer system capable of transferring conference control information, telewriting information, and facsimile manuscript information between a plurality of communication conference systems via an ISDN line,
The transmitting side is to dynamically change the data length of the facsimile document information frame when outputting the facsimile document information frame to the ISDN line according to the state of the telewriting application program. Information transfer method characterized by. 5. An information transfer system capable of transferring conference control information, telewriting information, and facsimile manuscript information between a plurality of communication conference systems via an ISDN line,
The sender side dynamically changes the data length of the facsimile document information frame according to the communication speed of the information channel of CCITT Recommendation H221 when outputting the facsimile document information frame to the ISDN line. Information transfer method characterized in that