JPH0556101A - Communication method - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a communication method capable of improving the efficiency of data communication and increasing the confidentiality of data in a situation where the functions of mutual systems are known. [Structure] When performing full-duplex data communication between a calling modem and a called modem whose mutual communication systems are known, a mutual negotiation sequence for confirming the mutual function of the calling modem and the called modem is set before the start of communication. The data communication 12 is executed by omitting it. Therefore, the time required for the mutual negotiation sequence is shortened, and the data cannot be accessed from the modem of the general protocol that executes the data communication 12 after executing the mutual negotiation sequence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method for performing data communication using various wired and wireless lines, and a mutual system of a calling modem and a called modem is known before the start of communication. It is used in some data communication systems.

[0002]

2. Description of the Related Art An example of full-duplex data communication between a calling modem and a called modem whose mutual communication systems are known is an online system such as a bank. In this communication system, a special handshake sequence is provided to confirm the mutual function of the calling modem and the called modem before the actual data transfer is started. The mutual function mentioned here is a method of data compression / expansion, error correction, or the like, and actual data transfer is started after the handshake sequence is completed.

Conventional CCITT V. Based on the 22bis standard, MNP (Microcom Network Pr)
The communication procedure for executing the protocol is as shown in FIG.

CCITT V. After the 22 bis communication protocol 41 is completed, the handshake protocol 42 for confirming the mutual function is performed, and the MNP communication sequence (data communication period) 43 is executed.

[0005]

In such a special situation (a situation in which the mutual system functions are known before the start of communication), the mutual functions, such as the error correction method and the data compression method, are to be solved. The handshake sequence for method confirmation is virtually unnecessary. However, even in such a special situation, since the above-described special handshake sequence for mutual confirmation already exists, inefficient data communication results. This deterioration in efficiency is fatal when the amount of data to be transmitted and received is small, or when data communication with a large number of systems must be performed within a certain time.

Further, when a general protocol in which a handshake sequence for mutual confirmation is carried out and communication is started in this way is used, there is a possibility that communication will be established even if not a specific partner. Therefore, the confidentiality of data is deteriorated.

An object of the present invention is to provide a communication method capable of improving the efficiency of data communication and increasing the confidentiality of data in a situation where the functions of mutual systems are known.

[0008]

According to a first aspect of the present invention, there is provided a method for full-duplex data communication between a calling modem and a called modem, which communication systems are known to each other, prior to the start of communication. The feature is that the mutual negotiation sequence for confirming the mutual function between the modem and the incoming modem is omitted.

According to a second aspect of the present invention, in full-duplex data communication, an exchange sequence of a code for certifying the system between the calling modem and the called modem is executed before the communication is started, and the comparison result is used. It is characterized in that the mutual negotiation sequence for confirming the mutual function of the calling modem and the called modem is omitted when the mutual communication systems are known.

According to a third aspect of the communication method, data compression /
Microcom network for expansion or error correction
The communication system adopting the protocol is characterized in that the mutual negotiation sequence for confirming the mutual function of the calling modem and the called modem is omitted before the communication is started.

A communication method according to a fourth aspect is data compression /
Microcom network for expansion or error correction
In a communication system adopting the protocol, an exchange sequence of a code for certifying the system is executed between the calling modem and the called modem before the communication is started, and if the mutual communication systems are known from the comparison result, the call is made. The feature is that the mutual negotiation sequence for confirming the mutual function between the modem and the incoming modem is omitted.

[0012]

According to the structure described in claim 1 or 3, the handshake generally used for mutual confirmation is communication such as error detection / correction or data compression / expansion between mutually known systems. Since a special protocol is used to perform the actual data communication by omitting, the communication efficiency can be improved by shortening the communication time and the confidentiality of the data can be improved.

According to the second or fourth aspect of the present invention, when the identification code is confirmed and it is confirmed that the systems are mutually known, a hand generally used for mutual confirmation. Since the special protocol is used to perform the actual data communication by omitting the shake, the confidentiality of the data can be further increased.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The communication method of the present invention will be described below based on specific embodiments. Here, CCITT V. 22bi
s standard based on MNP (MicrocomNetwork)
(k Protocol) will be described as an example.

The communication method of the present invention can be applied to the case where all the systems to be connected to each other are known as shown in FIG. Specifically, in the pre-communication stage, shown in FIG. CCITT
V. After the 22 bis communication protocol 11 is completed, the MNP handshake protocol 42 for confirming the mutual function shown in FIG. 4 is omitted, and the normal MNP data communication 12 is executed.

By thus omitting the MNP handshake protocol 42 and executing the normal MNP data communication 12, the communication time is shortened and the connection from the general modem trying to execute the MNP handshake protocol 32 is achieved. Do not accept. Therefore, it is possible to limit the connection partner and improve the confidentiality.

FIG. 2 shows another specific embodiment. In this embodiment, as a method of minimum confirmation that the mutual systems are known, a secret code exchange sequence is added, and CCITT V. After the 22 bis communication protocol 21 is completed, the mutual function confirmation 42 shown in FIG. 4 is omitted, and a short code exchange sequence 22 is performed to confirm that the mutual systems are known. After that, the normal MNP data communication 23 is executed.

In this way, in addition to the embodiment shown in FIG. 1, the security code exchange sequence 22 is set, and after confirming that the connected system is the expected system, the communication system is started. Figure 1 shows the data security
It is more improved than the communication method shown in.

In the communication method shown in FIG. 2, the PIN code of the incoming modem is confirmed from the calling modem and the PIN code of the calling modem is confirmed from the incoming modem.
In the case of one-way communication in which sales status data of a branch is communicated to the head office such as a POS system, this PIN code confirmation sequence is possible in either case. Further, if it is determined that the connected communication system is not the expected system, it may be forcibly disconnected. As an example of this case, the flow of the calling modem is shown in FIG.
, And the routine 31 represents the disconnection execution. A similar method can be used for an incoming call modem.

Also in the communication method shown in FIG.
If it is determined that the connected communication system is not the expected system, it can be forcibly disconnected.

[0021]

According to the communication method of claim 1 or 3, when performing full-duplex data communication between the calling modem and the called modem, whose communication systems are already known,
Before the start of communication, the actual data communication is performed by omitting the mutual negotiation sequence for confirming the mutual function of the calling modem and the called modem, so that the communication efficiency is improved by shortening the communication time and the confidentiality of the data is improved. You can

According to the second or fourth aspect of the present invention, when the identification code is confirmed and it is confirmed that the systems are mutually known, the hand generally used for mutual confirmation. Since the special protocol is used to perform the actual data communication by omitting the shake, the confidentiality of the data can be further enhanced.

[Brief description of drawings]

FIG. 1 is a timing chart showing a communication method of the present invention.

FIG. 2 is a timing chart showing another embodiment of the communication method of the present invention.

FIG. 3 is a flow chart diagram of a calling modem in the case of disconnecting a line in the case of collation mismatch in the communication method.

FIG. 4 is a timing chart of a conventional communication method.

[Explanation of symbols]

 11,21 CCITT communication protocol 12,23 MNP data communication 22 Security code exchange sequence

Claims (4)

[Claims] 1. When performing full-duplex data communication between a calling modem and a called modem whose mutual communication systems are known, mutual negotiation for confirming mutual function of the calling modem and the called modem before starting communication. A communication method that omits sequences. 2. When performing full-duplex data communication, an exchange sequence of a code for certifying the system is executed between the calling modem and the called modem before the communication is started, and the mutual communication systems are known from the comparison result. A communication method that eliminates the mutual negotiation sequence for confirming the mutual function of the calling modem and the called modem in some cases. 3. A communication method for omitting a mutual negotiation sequence for confirming a mutual function of a calling modem and an incoming modem before starting communication in a communication system adopting a Microcom network protocol for data compression / decompression or error correction. .. 4. In a communication system adopting a Microcom network protocol for data compression / decompression or error correction, a sequence for exchanging a code for certifying the system between a calling modem and a called modem is executed before the start of communication. However, if the mutual communication system is known from the comparison result, the communication method for omitting the mutual negotiation sequence for confirming the mutual function of the calling modem and the called modem.