JPH08167985A - Speed-up method of facsimile communication method - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the facsimile communication time. [Constitution] In the communication capability negotiation procedure 1, the calling station 22 obtains a list of its own communication capabilities from the called station 23.
Then, the called station 23 selects the maximum-speed full-duplex communication capability that can be handled in the list and returns it to the calling station 22.
Next, the communication method is established by the communication modem startup procedure 2 determined by the determined communication capability, and the FAX-specific negotiation procedure 3 is performed by the established full-duplex communication method. After that, the CFR 4 and other commands and the image information data 5 and 8 are transmitted and received 12 by full-duplex high-speed communication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile communication method for communicating image information between terminals via a general exchange telephone network.

[0002]

2. Description of the Related Art Conventionally, a facsimile protocol T.20 standardized by the International Telecommunication Union / Telecommunication Standardization (hereinafter referred to as ITU-T) is used. As shown in the sequence of FIG. 4A, a calling station 22 that makes a call by a partner telephone number and sends image information, and a called station 30 that receives an incoming call and receives image information Facsimile communication was provided by sending and receiving control commands and image information data to and from the H.23. Here, a non-standard function (hereinafter referred to as NSF) 13 indicated by a thin arrow in FIG. 4A, a called terminal identification (hereinafter referred to as CSI) 14,
A digital identification signal (hereinafter referred to as DIS) 15, a transmission terminal identification (hereinafter referred to as TSI) 17, a digital command signal (hereinafter referred to as DCS) 18, and other commands are transmitted / received according to the above standard. Half-duplex communication at a communication speed of 300 bps using the channel 2 of 21 is used, and the DIS 15 and the DCS 18 transmit and receive the image information data 5 and 8, the training check 19 and the training 20 and 21 indicated by the thick arrows. Half-duplex communication at a communication speed determined to be communicable between both stations is used in negotiation by transmission and reception.

[0003]

In the above-mentioned conventional facsimile communication method, a command for transmitting a command from the calling station to the called station is sent and then a command for returning a response from the called station to the calling station is sent. When sending the command with the transmission right reversed, the preamble 24 of about 1 second is added to the command of the HDLC frame structure as shown in the format of FIG. 4B in order to establish communication synchronization. Before sending the image information data, it is necessary to check whether or not communication is possible at the communication speed determined by the negotiation.
However, there is a drawback in that the training 20 and 21 are required to establish the communication synchronization.

Further, although the communication modem has been speeded up and the image information data can be transmitted and received at a higher communication speed, the command is transmitted and received at a low communication speed of 300 bps. There is a drawback that the overhead required for switching the communication method cannot be reduced.

It is an object of the present invention to require no preamble or training to establish communication synchronization prior to sending command and image information data, and to introduce overhead for sending and receiving slow commands. It is an object of the present invention to provide a method for increasing the speed of facsimile communication that does not include the above.

[0006]

According to a method of speeding up a facsimile communication method of the present invention, one terminal notifies a partner terminal of a list of communication capabilities of its own terminal, and the other terminal receives the notification of the list. The negotiation procedure that selects the optimal communication capability between terminals by returning the communication capability that can be supported from the inside and the highest communication speed, and the communication capability selected by the negotiation procedure is the existing half-duplex of the facsimile. If only protocol is used, standard facsimile communication procedure for transmitting and receiving commands and image information data using the existing half-duplex protocol, and full-duplex high-speed communication capability selected by the negotiation procedure, Command and image information data for control of the selected full-duplex high-speed communication capability And a non-standard facsimile communication procedure for communicating image information by transmitting and receiving using a communication method and communication speed.

[0007]

[Function] Since commands and image information data are transmitted / received at a high-speed full-duplex communication method and communication speed selected by negotiation, a preamble is added to the command or training is transmitted in order to confirm communication synchronization. In addition, there is no need, and the overhead required for switching the communication system by transmitting / receiving a command at a low communication speed is eliminated, and the command is transmitted / received at a high communication speed, which speeds up communication of image information.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a sequence diagram showing the operating principle of the method for speeding up facsimile communication according to the present invention.

In the method for speeding up the facsimile communication, first, the calling station 22 makes a call by the telephone number of the other party and the called station 23 detects the incoming call to establish the connection of the general switched telephone network. After that, the communication capability negotiation procedure is performed. That is, the calling station 22 obtains a list of communication capabilities of the communication system and communication speed of the called station 23 from the called station 23.
Then, the called station 23 determines from the received list of communication capabilities of the calling station 22 the full-duplex communication capability that the local station can support and the highest communication speed. Calling station 2
2 is notified (step 1). Here, the notification command for negotiation is performed at a communication speed of 300 bps.

Next, in order to perform synchronization and training between the communication modems determined by the communication capability determined in step 1, the communication modem startup procedure is executed to establish a full-duplex communication method (step 2).

Next, the FAX-specific negotiation procedure is executed by using the full-duplex communication method established in the communication modem start-up procedure in step 2, and the facsimile such as the paper size and the image information data encoding method is performed. A unique negotiation is performed (step 3). Here, the negotiation procedure 3 specific to FAX is performed in step 2
It may be performed using a communication speed of 300 bps before the full-duplex communication method is established by the communication modem startup procedure.

After that, by using the paper size and the image information data coding method determined in the negotiation peculiar to the FAX in step 3, the facsimile protocol T.264 standardized by ITU-T is used. 30 command and image information data reception preparation confirmation (hereinafter referred to as CFR) 4, image information data 5, multi-page signal (hereinafter referred to as MPS) 6, message confirmation (hereinafter referred to as MC
F) 7, image information data 8, procedure end (hereinafter referred to as EOP) 9, MCP 10, and disconnection command (hereinafter referred to as DCN) 10 transmission / reception sequence, and full-duplex communication method established in step 2. And the transmission / reception 12 of the electronic message is performed using the high communication speed. In this speed-up method of the facsimile communication method, the command and the image information data are communicated at the full-duplex communication method and the communication speed decided by the negotiation, so that the full-duplex communication path is established as the communication path. Therefore, preamble and training for making communication possible prior to sending individual messages are not required. Also, since the same communication method is used for command transmission and image information data transmission, the overhead required to switch communication methods can be reduced, and commands can be sent at the same high communication speed as image information data, so high speed is possible. It is possible to realize transmission of various image information.

FIG. 2 is a sequence diagram of the first embodiment of the method for speeding up the facsimile communication method of the present invention.

In this method for speeding up the facsimile communication method, a communication capability negotiation procedure 31 and a FAX-specific negotiation procedure 33 are used as a facsimile protocol T.264 standardized by ITU-T. By the method according to 30,
This is performed as shown in FIG. That is, the called station 23 sends a command NSF13 indicating a non-standard function, a command CSI14 for notifying the identifier of the called terminal, and a command DIS15 indicating the communication capability and the image information data receiving capability. The calling station 22 is provided with the full-duplex communication capability which is provided as a non-standard function of the calling station 22 when the called station 23 does not send the NSF 13 or when the called station 23 receives the NSF 13. If not, the image information is communicated according to the standard sequence shown in FIG. The calling station 22 receives the NSF 13 and receives the calling station 22.
When the called station 23 has the full-duplex communication capability provided as the non-standard function of the non-standard function of the non-standard function, the non-standard function setting (hereinafter referred to as NSS 16) is returned to the called station 23 together with the transmitting terminal identification (TSI) 17 to determine the full-duplex communication method and communication speed at which the communication speed for transmitting and receiving the subsequent command and image information data is the highest. To do. As the negotiation procedure 33 peculiar to the FAX, the paper size, the coding method of the image information data, and the like are performed with the called station 23 as in the case of FIG.
Return to 3. Next, the determined calling station 22 and called station 2
In order to establish synchronization for performing communication at the full-duplex communication method and the communication speed between the three communication modems, the communication modem startup procedure 3 determined by the corresponding communication method and communication speed
To establish a communication-enabled state.

The subsequent sequence of commands and image information data is transmitted / received 12 by a high-speed full-duplex communication method which enables communication in accordance with a standardized facsimile protocol.

In the method for speeding up the facsimile communication according to the present embodiment, since the message after the start-up procedure of the communication modem is executed is transmitted / received at the high-speed full-duplex communication speed, the overhead is reduced and the facsimile communication time is shortened. To be done. Also, the communication capability negotiation method is FA
Since the X-specific negotiation is also based on the standard facsimile protocol, it is possible to communicate with the existing facsimile apparatus. FIG. 3 is a sequence diagram of the second embodiment of the method for speeding up the facsimile communication method of the present invention.

In this method for speeding up the facsimile communication method, first, as a procedure corresponding to step 1 in FIG. 1, V.V. which is a standard of a communication modem for data communication. The communication capability is negotiated according to the standard of No. 8 to determine the maximum speed full-duplex communication method and the communication speed between the calling station 22 and the called station 23 (step 41). Next, in order to perform synchronization and training between the communication modems determined by the communication method determined in step 41, the communication modem startup procedure 2 is executed to establish a high-speed full-duplex communication method. Then, the FAX-specific negotiation 43 is executed according to the standard facsimile protocol. At this time, the negotiation items regarding the communication method are ignored, and the negotiation is performed only regarding the negotiation items specific to the facsimile such as the paper size and the encoding method of the image information data.

After that, a command and image information data transmission / reception sequence determined by the standard facsimile protocol is used to transmit / receive a message 1 using the high-speed full-duplex communication method established in the startup procedure 2 of the communication modem.
2 to communicate image information.

In the method for increasing the speed of the facsimile communication method of this embodiment, a high-speed communication modem for data communication, which is available at a lower cost than the conventional technique, is used for the facsimile communication.
Since the telegrams after executing the communication modem start-up procedure can be transmitted and received at full-duplex high-speed communication without adding the dedicated function for the protocol, the facsimile communication time can be shortened and it is cheap and high-speed. It is possible to use it without modifying the communication modem.

[0021]

As described above, the present invention establishes communication synchronization by transmitting and receiving commands and image information data with the full-duplex communication capability of the highest communication speed capable of communicating between terminals. There is no need to add a preamble to the command format or perform training, and since the command is sent and received in the same communication method as the image information data, there is no overhead for switching the method, and The communication time of the facsimile information is carried out at a high speed together with the image information data, so that the communication time of the facsimile information is significantly shortened.

[Brief description of drawings]

FIG. 1 is a sequence diagram showing an operating principle of a method for speeding up a facsimile communication method of the present invention.

FIG. 2 is a sequence diagram of a first embodiment of a method for speeding up a facsimile communication method of the present invention.

FIG. 3 is a sequence diagram of a second embodiment of the method for speeding up the facsimile communication method of the present invention.

FIG. 4 is a sequence diagram of a conventional example of a facsimile communication method.

[Explanation of symbols]

 1, 31, 41 Communication system negotiation procedure 2 Communication modem startup procedure 3, 33 FAX specific negotiation procedure 4 CFR 5, 8 Image information data 6 MPS 7 MCF 9 EOP 10 MCF 11 DON 12 Transmission / reception 13 NSF 14 CSI 15 DIS 16 NSS 17 TSI 18 DCS 19 Training check 20, 21 Training 22 Calling station 23 Called station 24 Preamble

Claims (1)

[Claims] 1. A facsimile communication method for communicating image information between terminals via a general switched telephone network, wherein one terminal notifies a partner terminal of a list of communication capabilities of the terminal, and the partner terminal notifies A negotiation procedure for selecting the optimal communication capability between terminals by returning the communication capability with the highest communication speed that can be handled from the received list, and the communication capability selected by the negotiation procedure is that of the facsimile. When only the existing half-duplex protocol is used, a standard facsimile communication procedure for transmitting and receiving commands and image information data using the existing half-duplex protocol and a full-duplex high-speed communication capability are selected by the negotiation procedure. If so, the command and image information data for the subsequent control are sent to the selected all A method for speeding up a facsimile communication method, comprising: a non-standard facsimile communication procedure for performing communication of image information by transmitting and receiving using a communication method having a dual high-speed communication capability and a communication speed.