Data communication system and communication terminal equipment

Details Data communication system and communication terminal equipment Data communication system and communication terminal equipment

1996-09-04

2000-02-29

Hsu, Alpus H.

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

370420, 709245, 711203, H04L 1256, H04L 1228

Patent

active

060318392

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a data communication system in which data communication is performed between communication terminal equipments utilizing unique data communication addresses.


BACKGROUND ART

In a data communication system, each communication terminals has a unique data communication address assigned thereto. For transmitting data from each communication terminal, a destination to which the data are to be transmitted is designated based on the data communication address. In a typical conventional data communication system, such a data communication address is fixed to each communication terminal and a network switching device (i.e., network exchange) determines the destination for the data based solely on the data communication address.
Incidentally, in the data communication system, sometimes a plurality of data terminal equipments are connected to one communication terminal. In this case, since the plurality of data communication terminals are used respectively by plurality of users, the data communication terminals are required to be handled independently. Further, the number of the data communication terminals, which are connected for use respectively to the communication terminal equipments and the data communication addresses for those data communication terminal equipments are changeable in accordance with necessity, taking into consideration convenience of the users of the respective terminals. However, since the conventional data transmission system is operated to control the destination for transmission of data by assigning a specific data communication address to each communication terminal as mentioned above, it apparently lacks versatility to meet such a request.


DISCLOSURE OF INVENTION

The present invention has been accomplished in view of the above situation. It is, therefore, an object of the present invention to provide a data communication system in which a data communication address for a communication terminal can arbitrarily be changed whenever it is used.
First, the subject matter of a first invention resides in a data communication system comprising: least one data communication terminal which is assigned with a unique data communication address so as to perform a data communication, or having at least one unique data communication address and further assigned with a unique identifier; communication terminal equipments and adapted to perform an appropriate switching operation between two communication terminal equipments within a local network or between a communication terminal within the local network and a communication terminal within a remote network, the network switching device using an identifier assigned to a communication terminal equipment when the communication terminal is to be called; and communication terminal to be used for communication and a plurality of data communication addresses; corresponding relation between an identifier of the certain communication terminal and a data communication address during a period of use thereof, in accordance with instructions from the certain communication terminal equipment; respect to a certain data communication address, obtaining an identifier corresponding to the certain data communication address with reference to the database and calling the communication terminal using such an obtained identifier so as to transmit data.
According to this first invention, when a communication terminal is used, a relation between data communication addresses and an identifier of the communication terminal equipment is registered (or stored) in a database and a destination for data is determined based on information stored in the database. Accordingly, there can be obtained such an advantageous effect that a communication terminal to be used can arbitrarily be changed for a certain data communication address.
Similarly, the subject matter of a second invention resides in a data communication system wherein when an access is made to the database, a corresponding relation between an identifier of the communication t

REFERENCES:
patent: 5067123 (1991-11-01), Hyodo et al.
patent: 5276441 (1994-01-01), Katsurada
patent: 5287103 (1994-02-01), Kasprzyk
patent: 5329527 (1994-07-01), Ujihashi et al.
patent: 5740231 (1998-04-01), Cohn

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