Patent
1995-09-11
1998-06-09
Lee, Thomas C.
39520057, 39520067, G06F 1300
Patent
active
057648948
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a system for communicating with a network. The invention is particularly applicable to a network of the FDDI type in which the transmission medium is constituted by fiber optics, a network which is standardized by ANSI under the reference number X3T9-5, and by ISO, the International Standards Organization.
It is known that networks are constituted by a plurality of terminals or stations linked to one another by a transmission link (in the case of an FDDI-type network, the corresponding transmission medium is constituted by fiber optics). A computer linked to a network is considered a terminal.
Numerous modern networks operate in accordance with the same reference model. The most widely known are the OSI or TCP-IP reference models. These models are similar with regard to the definition of their architecture in the form of standardized layers. Thus, in the OSI model, there are seven different activity layers, the bottom layer (layer 1) corresponding to the physical transmission of signals, and the top layer (layer 7) corresponding to the functions carried out by the application programs (more simply called applications) and the users of the network in question.
The trend in the technological development of networks and the utilization of greater and greater numbers of terminals is leading to the development of communication processors, which are most often associated with a computer for the purpose of reducing the load on its central processor by carrying out part of the management of its communications with the other terminals in the network. In a given network, computers of different types using different operating systems can be made to communicate.
The association of a computer and a communication processor constitutes what may be called a system for communicating with a network.
In this association, the role of the communication processor (which can also be called a data transmission system) is to adapt the conditions for transmitting information through the bus of the computer to which it is connected to the conditions for transmitting through the network, which are totally different. A communication processor of this type allows applications which are supported by several operating systems in various computers to communicate with one another. In particular, it allows the various communication layers of the operating system of a first computer to communicate with the various communication layers of the operating systems of other computers which are directly or indirectly connected to this same network. For example, a communication processor of this type is known which has the simplified architecture shown in FIG. 1, and which is described, for example, either in the French patent application No. 9213653 filed Nov. 13, 1992 by the Applicant under the title "Tool for Simulating a Network Code," or in the French patent application No. 9215521 with the title "System for Transmitting Data between a Computer Bus and a Network," filed Dec. 22, 1992 by the instant Applicant.
A communication processor of this type, designated NCC, makes it possible to assure the management of data transfers between a computer HOST, which is equipped with an internal bus PSB and whose operating system is designated SE.sub.1, and a network RE, which is an FDDI-type network, for example. The bus PSB is, for example, a bus of the MULTIBUSII type (a trademark registered by the Intel Corporation) standardized according to IEEE (Institute of Electrical and Electronic Engineers) standard 1296.
A processor NCC of this type includes the following three essential parts: for example, the model described in French patent application No. 9108908 filed Jul. 15, 1991 by BULL S. A., under the title "Universal Device for Coupling a Computer Bus to a Controller of a Group of Peripherals". This part is equipped with an operating system, for example a system of the type described in French patent application No. 9108907 filed the same day as the above, by the same applicant, under the ti
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6TH Mediterranean Electrotechnical Conference 22 May 1991 Ljubljana, Slovenie pp. 1025-1028 Veiga et Jepsen "SESTA: A Personal Computer FTAM and VT System" see the whole document.
Proceedings Computer Networking Symposium 17 Nov. 1986 Washington D.C., ETATS-UNIS pp. 205-213 Amirfaiz "Design and Implementation of a Generic Gateway" see pp. 209, left column, paragraph 3--right column, paragraph 2.
Boucher Gerard
Gillon Jean-Marc
Perrin Robert
Ravaux Paul
Bull S.A.
Kondracki Edward J.
Lee Thomas C.
Ton David
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