JPS6370640A - Terminal communication system in packet exchange network - Google Patents

Abstract

PURPOSE:To attain data communication to plural hosts belonging to different network systems by giving a protocol selection function to a nonpacket-shape terminal and providing a control information processing means or the like to a packet assembling/disassembling device. CONSTITUTION:When data communication is executed form the nonpacket-shape terminal 2 to a host device 3a, the terminal 2 uses communication software 21a to select a protocol according to the system A of the host 3a. Then the protocol is used to give a call request to a packet assembling/disassembling device PAD 1 and the PAD 1 uses a protocol identification circuit 12 to detect/ identify the protocol based on the system A used by the terminal 12 thereby selecting a corresponding PAD circuit 10a and a control information processing circuit 11a and realizing the PAD function and control information processing functions corresponding to the protocol. Thus, the terminal 2 stored in the equipment 1 applies data communication with the host 3a via an exchange network 4. Moreover, the data communication between the terminal 2 and the host 3b is attained by similar procedures to attain data communication to plural host of different network systems.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method by which a non-packet type terminal can communicate with multiple network systems with different communication protocols via a packet assembling and disassembling device (hereinafter referred to as a PAD device) and a packet switching network. This relates to a method for communicating data with each host.

[Conventional technology]

FIG. 2 is a block diagram showing a conventional connection form between a non-packet type terminal and a host.

In the figure, la and lb are PAD devices that assemble and disassemble packets and process control information according to the network systems of systems A and B, which have different communication protocols, respectively, and 2a and 2b are PAD devices for each system A and B, respectively. 3a and 3b are hosts of systems A and B, 4 is a packet switching network, and each terminal 2a.

2b exchanges packets via the corresponding PAD devices 1a and lb! ii4, each host 3a, 3b
is directly connected to the packet switching network 4.

Next, the operation will be explained. First, terminal 2a is host 3
A call request is issued to the PAD device 1a in order to perform data communication with the PAD device 1a. When the PAD device 1a receives a request from the terminal 2a, it assembles a calling packet and sends it to the packet switching network 4 addressed to the host 3a. Subsequently, when the call is established in response to a response from the host 3a, the terminal 2a to the host 32
Data communication between the two is now possible. From then on, terminal 2a
When the PAD device 1a sends data that it wants to send to the host 3a, the PAD device 1a packetizes the data from the terminal 2a based on the network system of system A, and sends the data packet to the host 3a. On the other hand, host 3a
The data packet sent from the terminal 2a is decomposed into a data format according to the procedure of the terminal 2a, and is transmitted to the terminal 2a. During this time,
A data packet containing control information based on the network system of system A is processed by the PAD device 1a itself, and may return a response by itself.

Terminal 2b follows the network system of system B.

In the case of the host 1-3b, data communication is similarly performed via the PAD device 1b.

As described above, data communication between a non-packet type terminal and a host is performed by the PAD device realizing a PAD function that is aware of the network system compatible with the system and processing control information.

[Problem that the invention seeks to solve]

The conventional terminal communication method is as described above, and since hosts and terminals cannot communicate with each other unless they are based on the same network system, data can be exchanged with multiple hosts with different network systems. In order to communicate, there are problems such as the need to prepare at least as many terminals and PAD devices as there are posts, each having the same network system as each host.

This invention was made to solve the above problems, and by using one non-packet type terminal and PAD device, it can communicate with multiple hosts with different network systems through a packet switching network. The purpose is to provide a terminal communication method that enables data communication.

[Means for solving problems]

In the terminal communication system according to the present invention, a non-packet type terminal is provided with a protocol selection function by switching software, and a PAD device is provided with a packet assembly/disassembly means and a control information processing means corresponding to each network system, and a protocol selection function is provided in the terminal. The apparatus includes a protocol identifying means for identifying the specified protocol and selecting a corresponding packet assembling and disassembling means and control information processing means.

[Effect]

The terminal according to the present invention supports a protocol based on the network system of the communication partner host by switching software. In addition, the PAD device detects and identifies the protocol used by the terminal, allowing the PAD device to follow communication procedures.
In addition to realizing the AD function, it also realizes processing of control information of the network system based on each protocol.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, numeral 1 indicates a PA that has a protocol detection and identification function from a terminal, realizes a PAD function corresponding to each procedure, and has a control information processing function associated with each network system.
Device D, 2 is a non-packet type terminal that can support protocols based on the network system of the communication partner host by switching software, and 3a and 3b are systems A, respectively.

B is a host having a network system, and 4 is a packet switching network. In the PAD device 1, 10a, 10
b is a PAD circuit that realizes a PAD function for systems A and B, respectively, and lla.

11b is a control information processing circuit that implements a control information processing function according to a protocol from a terminal; 12 is a PAD circuit 10a or 1 that detects and identifies a protocol from a terminal;
0b and the control information processing circuit 11a or llb, and these constitute each means of the present application. On the other hand, 21a and 21b of the terminal 2 are communication software based on each network system that can be selected corresponding to the systems A and B.

Next, the operation will be explained. First, terminal 2 is host 1-3a
A case in which data communication is performed with 6-1 will be explained below. Terminal 2 uses the host 3a's network 1-work system.

Here, system A is recognized and the protocol that follows system A is selected by switching the software to 21a. Subsequently, a call request is issued to the PAD device 1 using the procedure according to the protocol. When the PAD device 1 receives a request, the protocol identification circuit 12 detects and identifies the protocol based on system A used by the terminal 2, selects the corresponding PAD circuit] Oa and control information processing circuit 11a, and executes the PAD according to the protocol. Function and system A
Realizes control information processing functions. From now on, terminal 2 and PA
Since the D device 1 realizes the network system of the communication partner host 3a, here the network system of the system A, the terminal 2 accommodated in the PAD device 1 performs data communication with the post 3a via the packet switching network 4. be able to.

On the other hand, when terminal 2 performs data communication with post 3b, terminal 2 recognizes the network system corresponding to system B, switches software, and selects 21b. P
AD device 1 detects the network system of system B with protocol identification circuit 12 in response to a request from terminal 2, and identifies the network system of system B.
2, selects the corresponding PAD circuit 10b and control information processing circuit 11b, and realizes data communication with the host 3b in the same manner as above.

〔Effect of the invention〕

As described above, according to the present invention, a non-packet type terminal is provided with a protocol selection function by switching software, and a PAD device is provided with a packet assembly and disassembly means and a control information processing means corresponding to each network system. and a protocol identification means for identifying the protocol selected by the terminal and selecting the corresponding packet assembly/disassembly means and control information processing means, so if these are used to join the packet switching network, one device can From the terminal of -・P
This has the advantage that the AD device can be used to realize data communication with multiple hosts with different network systems.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example. 1... PAD device, 2... Non-packet type terminal, 3
a, 3b... host, 4... packet switching network, 10
a, 10b...PAD circuit (packet assembly and disassembly means)
, lla, llb... Control information processing circuit (control information processing means), 12... Protocol identification circuit (protocol identification means), 21a, 21b... Communication software,
A, B...Systems with different network systems. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa (two idiots)
J2 Procedural Amendment M) Showa June 9th, July-9th, Mr. Commissioner of the Patent Office
Country 1, Indication of the incident Patent application 1986-2154.48
No. 2, Name of the invention Terminal communication method in a packet switching network 3, Relationship with the case of the person making the amendment Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Representative of Mitsubishi Electric Corporation Moriya Shiki 4, Agent Address 5, Mitsubishi Electric Corporation, 2-2-3 Marunouchi, Chiyoda-ku, Tokyo, Japan Detailed description of the invention subject to amendment. 6. Contents of the amendment (1) The following sentence will be added after "is carried out." on page 3, line 19 of the specification. ``In this case, the processing contents of the PAD devices 1a and lb are different depending on the system.'' (2) In the second line of page 8 of the same book, ``Identification], 2L,'' is replaced with ``Identification, ” he corrected. that's all

Claims (1)

[Claims] Software switching to a non-packet type terminal in a terminal communication system in a packet-switched network in which a non-packet type terminal performs data communication with hosts of multiple network systems with different communication protocols via a packet assembly/disassembly device and a packet-switched network. In addition, the packet assembling and disassembling device is equipped with a packet assembling and disassembling means and control information processing means corresponding to each network system, and a packet assembling and disassembling means and control information that identify and correspond to the protocol selected by the terminal. 1. A terminal communication system in a packet switching network, comprising: a protocol identifying means for selecting a processing means.