Host structure for adaptors for terminals belonging to a distrib

Details Host structure for adaptors for terminals belonging to a distrib Host structure for adaptors for terminals belonging to a distrib

1992-08-19

1994-08-16

Donovan, Lincoln

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

361752, 361753, 361797, H05K 714, H05K 500

Patent

active

053392205

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a host structure for terminal adaptors belonging to a distributed information processing architecture. More particularly, it applies to an architecture that uses a local area network of the type known as Carrier Sense Multiple Access with Collision Detection (often called by its acronym, CSMA/CD). The invention applies more especially to local area networks of the Ethernet or Cheapernet type. In the ensuing text, such networks will be referred to by the general name of Ethernet networks.
Communications networks are constituted of a plurality of units, generally known as data terminal equipment, or DTE. For linguistic simplicity, they are also known as terminals or stations. A computer connected to a network is considered to be a terminal. The terminals communicate with one another via a transmission medium, which may be a coaxial cable, for example, in the case of the Ethernet networks.
Local area networks (LAN) are networks limited to one geographic location of limited area, where the distances between the various stations are on the order of a few meters to a few tens of meters, or may even be as much as several kilometers.
Local area networks of the CSMA/CD type are frequently used by now. They are standardized by the IEEE Committee of the Institute of Electrical and Electronic Engineers, in the form of a standard, 802.3 (adopted by ISO, the International Standards Organization, in the form of ISO Standard 8802.3).
The Ethernet networks have a data transmission rate of 10 Mbits per second, and their standardized transmission medium is a coaxial cable with a characteristic impedance of 50 Ohms.
A computer is known to comprise one or more central processing units, input/output processors, random access memories and read only memories associated with all of these processors, and input/output controllers, on the one hand, and on the other hand, various peripherals such as disk memories or input/output peripherals (terminals with a screen, printers, etc.) that enable the exchange of data with the outside, these peripherals being associated with peripheral controllers.
All of the constituent elements listed above (except for the peripherals) are disposed on a set of boards of standardized dimensions.
The trend in networks in industry, which is to use increasingly more numerous terminals, leads to the development of programmed communications servers at the level of the computers; their role is to reduce the load on the central processing unit of the computer by performing some of the management, on the one hand, of the messages sent by the various constituent elements of the computer to the telecommunications network to which the computer is connected, and, on the other hand, of messages originating in other terminals in the network.
The extremely rapid increase in the power and processing capacity of computer central processing units makes it possible to have an increasingly large number of input/output terminals communicate with the central processing units of the computer. These input/output peripherals are synchronous or asynchronous terminals that communicate with their external environment by way of transmission lines with rates that may range from 300 bits/s to 64 kbits/s. These input/output terminals of a computer communicate with the outside by way of a wide diversity of equipment known as modems (a contraction of the words modulator-demodulator), whose function is to adapt the electrical signal furnished by the input/output terminal to the transmission medium that connects the terminal with its external environment. These modems are defined by CCITT (Comite Consultatif International Telegraphique et Telephonique) notices V-24, V-28, V-11, V-35, and V-36, for example. These various notices also define the modes of transmission and the protocols in the corresponding transmission links. These links are carried physically by transmission media, which in fact have many separate cables or sets of wires.
Large modern information processing systems, accordingly made up of a c

REFERENCES:
patent: 4899254 (1990-02-01), Ferchau et al.
patent: 5027254 (1991-06-01), Corfits et al.
patent: 5103378 (1992-04-01), Stowers et al.
IBM Disclosure Bulletin "Method For Increasing Volume of Logic Book" vol. 33 No. 6A Nov. 1990.

Affiliated with

Also associated with

Rating

Host structure for adaptors for terminals belonging to a distrib does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Host structure for adaptors for terminals belonging to a distrib, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Host structure for adaptors for terminals belonging to a distrib will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-957461