JPH04245775A - Method for setting up specific communication in g4 facsimile - Google Patents

Abstract

PURPOSE:To attain a rational communication protocol for a G4 facsimile by offering a method for setting up specific communication such as confidential communication and repeating multi-address communication. CONSTITUTION:In the G4 facsimile specific communication setting method for transmitting image information through an ISDN information channel by using a communication protocol P for successively executing plural layers including a cession layer C, specific communication set data for executing specific communication such as confidential communication are previously allocated to a user area included in cession start command data transmitted at the time of execution of cession layer C and sent from a calling terminal to the called terminal side.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting special communications such as confidential communications and relay broadcast communications in G4 facsimile.

0002

2. Description of the Related Art Recently, one subscriber line has two information channels (B channel) and one signal channel (D channel).
ISDN (Integrated Digital Communication Network) service has been launched, which enables the securing of
G4 facsimile, which uses DN to send and receive image information, has been developed and is now in use. By the way, G
4. The internationally standardized Teletex communication protocol is used as a reference for the communication protocol used in facsimile. Teletex is a service that transmits encoded character signals between terminals via a line network, and its communication protocol is structured using multiple layers, as shown in Figure 2. For example, during transmission, transport connection is established in the transport layer by exchanging a transport connection request block (TCR) and a transport connection acceptance block (TCA) that is the response. Session settings (such as function settings between terminals for communication) are performed in the session layer by exchanging a session start command (CSS) and a session start response (RSSP), which is the response, and then moved to the document layer. Communication is performed by sequentially executing layers defined by a communication protocol, such as transferring documents using a communication protocol. On the other hand, for the communication protocol used in G4 facsimile, a basic configuration in which multiple layers are sequentially executed in a layered structure similar to Teletex was proposed by the ISO (International Organization for Standardization), and each facsimile manufacturer However, the details of the protocol have not yet been established, and each facsimile manufacturer has its own settings.

0003

[Problems to be Solved by the Invention] The present invention proposes a method for configuring special communication settings such as confidential communication and relay broadcast communication in the G4 facsimile communication protocol, thereby creating a rational communication protocol. The purpose of this paper is to provide a special communication setting method for G4 facsimile that can realize the following.

0004

[Means for Solving the Problems] The present invention proposed to achieve the above object utilizes a communication protocol that sequentially executes a plurality of layers including a session layer, and
This is a special communication setting method for G4 facsimile that transmits image information through N information channels, in which confidential communication, etc. Special communication setting data for performing special communication is allocated in advance and sent from the calling terminal to the called terminal.

[0005]

[Operation] In the present invention, when an operation such as confidential communication or relay broadcast communication is performed during facsimile transmission, the user area reserved in the session start command data sent when the session layer is executed in the communication protocol. Special communication setting data is assigned to and,
When the line is connected and each layer is executed sequentially according to the communication protocol, when the session layer is executed, a session start command containing special communication setting data is transmitted from the calling terminal to the called terminal side. Then, the session start command is received and special communication settings requested by the calling terminal are performed.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 is based on the communication protocol P proposed by the ISO (International Organization for Standardization), which has a seven-layer structure: application layer, presentation layer, session layer, transport layer, network layer, data link layer, and physical layer. This shows the method of the present invention, in which data necessary for special communication settings such as confidential communication and relay broadcast communication is transmitted from the calling terminal to the called terminal side using a session start command (CSS) when session layer C is executed. It is something to do.

In the method of the present invention, (1) When special communication such as confidential communication or relay broadcast communication is set during facsimile transmission, the user area (512 bytes) reserved in the session start command (CSS) is The data necessary for special communication settings is written to the area (open to the user). ■When each layer is sequentially executed according to the communication protocol P and the session layer C is executed, a session start command (CSS) containing necessary setting data including special communication setting data is sent to the incoming call via the line. Sent to the terminal side. ■On the called terminal side, the transmitted session start command (CSS)
and performs device settings according to the special communication setting data, as well as necessary device settings other than the special communication settings. ■Once the device settings have been completed, the called terminal sends a session start response (RSSP) back to the calling terminal to notify that the settings have been made as requested by the calling terminal. When communication settings cannot be made, data indicating that settings are not possible is notified to the calling terminal side using a session start response (RSSP). As described above, according to the method of the present invention, it is possible to transmit special communication setting data using the session layer while complying with the communication protocol proposed by ISO.

[0008] Although the above explanation does not refer to the specific contents of the special communication setting data, when setting confidential communication, the control command for instructing confidential communication, and when setting relay broadcast communication, relay synchronization A control command for instructing broadcast communication, data on a plurality of telephone numbers of broadcast destinations, etc. are written in the user area of the session start signal (CSS). In addition to confidential communication and relay broadcast communication, it is also possible to transmit special communication setting data such as time-specified transmission, polling transmission, and polling reception.

[0009]

Effects of the Invention As can be understood from the above explanation, according to the special communication setting method for G4 facsimile of the present invention, the user area reserved for the session start command can be effectively used when executing the session layer of the communication protocol. This makes it possible to efficiently transmit special communication setting data.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a special communication setting method for a G4 facsimile according to the present invention.

FIG. 2 is an explanatory diagram of a conventional Teletex communication protocol.

[Explanation of symbols]

C Session layer P Communication protocol

Claims (1)

[Claims] 1. A special communication setting method for a G4 facsimile that transmits image information via an ISDN information channel by using a communication protocol that sequentially executes a plurality of layers including a session layer, wherein the session layer is executed. Special communication setting data for special communication such as confidential communication is allocated in advance in the user area included in the session start command data sent at the time of the call, and is sent from the calling terminal to the called terminal. A special communication setting method for G4 facsimile, which is characterized by the following.