Patent
1996-06-10
1998-08-11
Kim, Kenneth S.
39520053, 3952006, 3952008, 395500, G06F 15177
Patent
active
057939586
DESCRIPTION:
BRIEF SUMMARY
This application is a national stage application of PCT/FR94/01275 filed Nov. 4, 1994, claiming the priority of French Application No. 93.13282, filed Nov. 8, 1993.
BACKGROUND OF THE INVENTION
The present invention relates to a system for communicating with a network which implements a communication code belonging to a plurality of open systems interconnection models, which system includes a package for administrating the various layers of the code. It is applicable to all types of networks, particularly the FDDI type standardized through the ANSI under the reference number X3T9-5 and through the ISO (International Organization for Standardization).
Modern networks operate according to a plurality of reference models which are similar when it comes to the definition of their architecture being in the form of standardized layers. Among these models, the best known are the OSI (English acronym for Open Systems Interconnection), ISO/DSA, and IPS (English acronym for Internet Protocol Suite) models (it will be recalled that the IPS model includes, under the same name, the submodels TCP, UDP, IP, and ICMP in particular). Thus, in the OSI model, there are seven different layers of activities, with the lowest layer (layer 1) corresponding to the physical transmission of the signals and the highest 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.
In current practice, systems for communicating with a network are constituted by the association of a computer, called a host system, and a communications processor. The purpose of the communications processor is to carry out part of the management of communications with the other terminals in the network. In this capacity, the communication processor takes care of the management of the lower layers of each of the reference models.
A communications system of this type is described, for example, in French patent application No. 93 02902, filed on Mar. 12, 1993 by the assignee of the instant application under the title "System for communicating with a network" or in French patent application No. 93 08968, filed by the assignee of the instant application on Jul. 21, 1993 under the title "System for communicating with a network and protocol for access to the transport provider belonging to this system." These two patent applications describe the software structure of a communications system of this type in greater detail and are hereby incorporated by reference herein. Moreover, a description of the hardware structure of such a system can be found in French patent application No. 92 15521, the title of which is "System for transmitting data between a computer bus and a network" filed on Dec. 22, 1992 by the instant assignee, and incorporated hereby by reference.
The general structure of a communications system of this type, which includes at least one communications processor (such a communications system can contain several communications processors which can communicate with several networks of different types), is shown in extremely simplified form in FIGS. 1a and 1b.
A communications system of this type, here called SCI, implements, using the host system HOST, the upper layers CH of any one of the reference models OSI, ISO/DSA, IPS (the latter of which can be supported just as well by a connection-mode network service as by a connectionless-mode network service; the connection mode, which is designated by the sign CONS, the English acronym for Connection Oriented Network Service, and the connectionless mode, which is designated by the sign CNLS, the English acronym for Connectionless Network Service, are based on the ISO standards 98787 and 8208 for the first and 8473 and 9542 for the second, which standards define the associated routing mechanisms and protocols).
Refer to FIGS. 1a and 1b, in which the three upper layers C5 through C7 of the OSI model are shown by way of example. The layers CH communicate with the lower layers CB, namely C4 through C2 of th
REFERENCES:
patent: 5473608 (1995-12-01), Gagne et al.
patent: 5491822 (1996-02-01), Allen et al.
patent: 5613100 (1997-03-01), Anezaki
IEEE Network: The Magazine of Computer Communications, vol. 2, No. 2, Mar. 1988, NY, US, pp. 20-29; S.M. Klerer "The OSI Management Architecture: An Overview".
Clement Valerie
Mouret Regis
Saint Paul Nathalie
Bull S.A.
Kim Kenneth S.
Kondracki Edward J.
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