Boots – shoes – and leggings
Patent
1994-08-22
1997-06-24
Lee, Thomas C.
Boots, shoes, and leggings
39520015, 364229, 36423222, 3642399, 3642423, G06F 300
Patent
active
056424825
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a system for transmission of data between a computer bus and a network. It is more particularly applicable to a fiber distribution data interface (FDDI) type data transmission network whose transmission medium is constituted of fiber optics (standardized by American National Standard Institute, ANSI, under the reference number X3D9-5, and by the International Standards Organization, ISO).
BACKGROUND OF THE INVENTION
Communications networks are constituted by a plurality of terminals or stations linked to one another by a transmission link (whose transmission medium is constituted of fiber optics, in the case of an FDDI-type network). A computer linked to such a network is considered to be a terminal.
Many modern networks are known which function according to the same reference model. The best-known are the Open System Interconnection (OSI) or Transmission Control Protocol/Internet Protocol (TCP/IP) reference models. These models are similar relative to the definition of the architecture of these networks in the form of standardized layers. Thus in the OSI model, there are 7 different activity layers, with the lowest layer (layer 1) corresponding to the physical transmission of signals, while the highest layer corresponds to the functions executed by the application programs and the users of the network in question.
Furthermore, within a network, the information messages emitted by the various stations are constituted by a plurality of frames. Every frame is constituted of usable data framed in time by control characters located at its head and foot.
The trend in technological development of networks, along with the utilization of more and more terminals, leads to developing programmed communications processors whose purpose is to reduce the load on the central processing unit by executing part of the management of its communications with the other stations in the network.
In addition, the extremely rapid development of communications networks and information processing systems leads to connecting computers of different types using different operating systems in the same network.
The object of a communications processor, which is also called a data transmission system, is to adapt the conditions for transmission of information in the bus of the computer to which it is associated, to the transmission conditions in the network, these transmission conditions being totally different. Furthermore, this data transmission system allows the different computer operating systems to dialogue with one another. In particular, it allows the various communications layers of the operating system of a first computer to dialogue with the various communications layers of the operating systems of other computers connected to the same network.
For example, one such communications processor is known, which is also called a data transmission system. Such a processor has the simplified architecture shown in FIG. 1. This type of architecture is described for example in the French Patent Application No. 92 13653 (corresponding to U.S. Ser. No. 08/143,130), filed by the present applicant Nov. 13, 1992 under the title "Outil de simulation d'un code de reseau" ["Tool for simulating a network code"].
Such a communications processor, known as a Network Communication Controller (NCC), makes it possible to assure the management of the data transfer between a computer HOST, equipped with an internal bus PSB and whose operating system is designated by OS, and a network RE, for example of the FDDI type. The bus PSB is for example a bus known as MULTIBUS II (trademark registered by INTEL) which is standardized by IEEE Standard 1296 (Institute of Electrical and Electronic Engineers).
The communications processor NCC comprises the following three essential parts: example the model described in patent application No. 91 08908 (corresponding to U.S. Ser. No. 07/913,477) which BULL S. A. filed on Jul. 15, 1991, under the title "Dispositif universel de couplage d'un bus d'ordinateur a un co
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Bull S.A.
Kim Ki S.
Kondracki Edward J.
Lee Thomas C.
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