When we refer to Ethernet, we usually mean the CSMA/CD Ethernet 19 in Objective-C

Creator Data Matrix ECC200 in Objective-C When we refer to Ethernet, we usually mean the CSMA/CD Ethernet 19

18 When we refer to Ethernet, we usually mean the CSMA/CD Ethernet 19
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At the time, existing protocols such as the ALOHA system developed at the University of Hawaii, had distinctly limited efficiency, mainly due to a higher collision rate 20 In essence, each computer waits for a different amount of time prior before attempting to retransmit
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In 1976, Dr Metcalfe, along with David Boggs, published this research in a landmark paper entitled, Ethernet: Distributed Packet Switching for Local Computer Networks in the Communications of the Association for Computing Machinery (ACM) [8] And on December 13, 1977, US Patent number 4,063,220, Multipoint Data Communications System with Collision Detection, was issued to Xerox Corporation, Dr Metcalfe s employer, formalizing the advent of Ethernet The benefits of CSMA/CD Ethernet soon became obvious, and in 1979, Digital Equipment Corporation (DEC) and Intel partnered with Xerox to commercialize the technology with DEC building the hardware (the Network Interface Cards) and Intel providing the semiconductor chips They were, however, persuaded by Dr Metcalfe and his associates, to make the technology publicly available and, therefore, avoid an Ethernet monopoly To their credit, the three companies agreed to this enlightened21 proposal and published the DIX standard,22 the first Ethernet specifications for 10 Mbps transmission based on the CSMA/CD protocol; a second version of this specification was published in 1982 In the meantime, Dr Metcalfe and others were also working with the nonprofit Institute of Electrical and Electronic Engineers (IEEE) to develop an open industry standard In 1983, the IEEE released the first truly open industry standard for Ethernet, IEEE 8023 Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications Developed by the 8023 working group of the 802 committee, the standard was pretty much the same as the DIX standard23 except for a few changes Subsequently, the International Standards Organization (ISO) also approved the Ethernet standard as the 88023, catapulting it into use worldwide
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Any reference to Ethernet today usually means the IEEE 8023 standards-based Ethernet [1] The CSMA/CD is hardly used anymore, except in half-duplex, shared media environments; instead sophisticated switches and other equipment are used in a full-duplex fashion in star-topologies where the issue of collisions is moot24
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The Development of Ethernet
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Several advances were made to the initial IEEE 8023 standard Over the past twentyodd years Ethernet has, in fact, seen considerable innovation and subsequent standardization The Ethernet standard has thus far focused on improvements across several dimensions:
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Distance Extended the physical distance more than 100 and up to approximately 2000 miles
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Enlightened because the companies forewent the short-term revenue prospects in favor of something that would ultimately be good for the entire industry 22 DIX stood for Digital Equipment Corportion, Intel, and Xerox 23 Hardware based on either standard can, in fact, interoperate 24 In typical enterprise LAN Ethernets these days, each workstation is connected over a dedicated point-topoint link to a switch in a hub/star topology and communicates (usually in a full-duplex manner) over this link Hence, the issue of colliding with frames from another workstation on theLAN simply does not arise
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Ethernet: From LAN to the WAN
Speed/Bandwidth Increased line speed to 10 Gb/s and higher (a thousand-fold increase from the initial 10M bandwidth) Media Enabled transmission over a host of wired and wireless media Added new capabilities to identify, separate, prioritize, and secure Processing data
Scale Continually made it more robust and operationally efficient to deploy and manage large Ethernets
These and other key developments in the Ethernet standard are listed in Table 11 and illustrate the continuous improvements that Ethernet continues to undergo Two IEEE25 working groups, 8023 and 8021, were particularly active in extending Ethernet to operate beyond the LAN A detailed discussion of these standards is beyond the scope of this book, but they are actively referenced wherever necessary
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