KR0149615B1 - Binary data transmitting method in front-end system - Google Patents

Abstract

The present invention is to reduce the session, improve the efficiency of the transmission path and provide transparency of the transmission, when the sender transmits a group of special characters, it is replaced with other characters and the receiver sends it again. In order to return to the original character and transmit a predetermined character further when replacing a group of special characters with another character, the transmission efficiency is improved.

Description

Binary Data Transmission Method in Front End System

1 is a diagram illustrating an existing protocol process.

2 is a diagram illustrating the concept of the present invention.

3 is a flowchart of the side protocol for transmitting binary data.

4 is a flowchart illustrating a flowchart of a side protocol for receiving binary data.

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the transmission of files and data consisting of binary data, and more particularly to transmission in networks employing Transmission Control Protocol / Internet Protocol (TCP / IP). That is, the present invention relates to a front-end system for transferring binary data between a computer and a computer, a computer and a computer, or a computer and a terminal by a multilevel connection.

Conventional Technology and Its Problems

FTP (File Transfer Protocol), a widely used binary data transfer protocol, is a terminal that allows users to telnet to a computer once they have logged in to the computer. It could not be used, but only by setting up a separate session. That is, in FIG. 1 assuming LAN conditions, a user can log in to computer 1 by running telnet at a terminal. This is a telnet session 1 is established between the terminal and the computer 1 and communication between the terminal and the computer 1 through this session. In this situation, if the user wants to receive the binary data in the computer 1 as the terminal, the user must set up a separate session, ie, ftp session 1, to receive the binary data. The reason that the session should be set apart from the existing session is that since telnet uses a group of characters as an escape sequence, sending a binary data by ftp in a telnet session breaks a group of characters in the binary data. This is because transparency of binary data is not guaranteed. Therefore, to ensure the transparency of binary data transmission, a session must be set up separately from the session at login. This deteriorates the efficiency of transmission lines such as LAN (Local Area Network), and wastes bandwidth of the line.

In addition, when a user logs in to Computer 1 at the terminal and then logs in to Computer 2, Telnet Session 2 is required between Computer 1 and Computer 2 separately from the existing Telnet session. In this situation, if the user wants to receive binary data on computer 2, an ftp session 2 is set up between computer 1 and computer 2. In other words, no direct session can be established between the terminal and computer2. This means that the terminal does not directly receive the binary care in Computer 2, but instead receives Computer 1. In other words, it means that the computer 1 receives the binary data of the computer 2 and transmits it back to the terminal. This is a huge waste of time, making binary data transfer difficult. In an environment such as a LAN, especially in an environment where binary data is distributed to multiple computers for distributed processing, waste of time and resources for binary data transmission is very serious.

In addition, the data of the computer is increasingly multimedia, and the existing protocol for text transmission and reception cannot transmit and receive multimedia data. Because multimedia data simultaneously transmits and receives 8-bit binary data as well as ASCII characters used for conventional text transmission and reception, the existing protocol for text transmission and reception cannot guarantee transmission transparency of communication lines.

[Problem to Solve Invention]

Accordingly, the present invention provides an input / output front-end system for ensuring the transparency of binary data transmission and reception while using a telnet session that has already been set up to solve the problems of the existing binary data transmission and reception. In other words, in the existing high-speed communication network environment, the object of the present invention is to enable the transmission and reception of binary data that is impossible at the multi-level connection by simply executing the system at the application layer without modifying the communication protocol TCP / IP. In other words, the main focus is on the input / output front-end system for binary data transmission and reception, which is essential for multimedia data transmission and reception. In other words, it aims to solve the inconvenience of multi-stage transmission and to make transparent binary data transmission even in the telesession.

[Configuration to solve the problem]

In order to solve this problem, the present invention transmits a character of binary data to be transmitted one by one, and the receiving side transmits binary data of a front-end system in which it checks, receives, stores, or transmits the data to another side. When sending a group of special characters, it replaces them with other characters and transmits them, and the receiving side has the structure of returning them back to the original characters.

In addition, when a group of special characters are replaced with other characters and transmitted, a predetermined character is further sent.

[Action]

In the present invention having this feature, the transmitting side first checks each character of binary data to be transmitted one by one to determine whether it is a group of special characters. If it is a special character, replace it with another character and send it along with the character indicating that it is a substituted character. When the receiver receives a character indicating that it is a substituted character, the receiver replaces the character following with the original character.

EXAMPLE

Embodiments of the present invention will be described below using functional block diagrams and flowcharts.

2 is a view showing the concept of the present invention, for example, if there is a group of characters that interfere with the transparency of the transmission if you want to retransmit the binary data transmitted from computer 2 or received from another computer or terminal through the network Convert him to another character and send it. In other words, in the second case, the computer 1 has a structure in which it is reduced to the original character.

The detailed process thereof will be described with reference to FIGS. 3 and 4.

First of all, there is DDLE as a signal required for this protocol, which is used to indicate whether or not to be substituted during transmission and reception.

First of all, if the character used as escape sequence in telnet exists in binary data, the character is not transmitted properly. These characters include 0, 9, 13, 15, 16, 17, 19, 22, 29, 157, 255. DDLE is used as a communication control character in this communication method, so if it is in a file, the file will not be transferred properly. Therefore, the character group including these numbers and DDLE is defined as ESC.

Therefore, when transmitting a character belonging to this ESC, it is necessary to replace it with another character and transmit the original character. If the function for this substitution is defined as F, one example of this substitution function can be defined as follows.

F (0) = '0'

F (9) = '1'

F (13) = '2'

F (15) = '3'

F (16) = '4'

F (17) = '5'

F (19) = '6'

F (22) = '8'

F (29) = '9'

F (157) = 'A'

F (255) = 'B'

F (DDLE) = '8'

Here, the function value of F corresponds to the ASCII value of the character in ''.

Characters, etc. defined above are just one example and may be defined differently depending on the embodiment, and are not related to the nature of the present invention.

Using the above, one embodiment of the present invention will be described according to a flowchart.

3 shows a flowchart of the substitution system on the transmitting side.

When input x is input from the system side of the system, it is checked whether the input character x is a character belonging to the ESC set. If the input character x belongs to the ESC set, the system outputs DDLE and F (x) to the line output. If it doesn't belong, print x.

If the character to be transmitted is a character that hinders the transparency of binary data transmission, it is replaced with another character and transmitted to facilitate the transmission of binary data.

4 shows a flowchart of the reduction system on the receiving side.

When this system is running, first set FLAG to FALSE. When the input x comes from the line input, first check whether FLAG is TRUE. If FLAG is FALSE, it checks whether the input character x is DDLE, sets FLAG to TRUE for DDLE, and outputs x to the system if not.

If FLAG is TRUE, the system outputs F ^-1 (x) on the system side.

As described above, the receiving side guarantees the transparency of the transmission if the received character is replaced with the original character.

[Effects of the Invention]

The present invention enables the transmission and reception of binary data for transmission of multimedia data in a terminal system based on the TCP / IP protocol, and in particular, the transmission of binary data that was impossible in a multi-level connection.

In addition, this method solves all the problems in the file transfer process using the existing modem protocol, and also solves the problem of ftp during the multi-stage transfer process. It can improve the inconsistency of storage time, reduce the waste of computer resources for setting up a separate virtual line, and reduce the time waste caused by multi-stage transmission.

Claims (1)

In the transmission of binary data of the front-end system in which the sender transmits one character of binary data to be transmitted one by one, and the receiver checks, receives and stores it, or transmits it to the other side, when the sender sends a group of special characters, And transmitting a predetermined character indicating that the character has been replaced before replacing the other character and returning the character to the original character.