Ethernet The most popular LAN technology Open Standard

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Ethernet The most popular LAN technology Open Standard Open and wide market

Ethernet 1970: Xerox in PARC, Robert M. Metcalfe, David Boggs, Charles Thacker, Butler Lampson Experimental Ethernet, 3Mbps 1979: Formal specifications DIX (DEC- Intel-Xerox). 10Mbps 1985: “IEEE 802.3 CSMA/CD” is published It has included new technologies periodically

Operation Stations connected to a SHARED MEDIUM No main controller Serial transmission to the medium, Manchester CSMA/CD Colissions

Shared Medium

BUS

Transmission in the BUS

Colission

Persistence and Non persistence 9

CSMA/CD Station ready for transmission Sense the Wait a random channel time (BEB)‏ Busy Free Transmit listening Stop transmission and Start jam signal Collision End of transmission

MTU Maximum Transfer Unit Big frames are not good for multiplexing Big delays in “conversations” More collisions

Importance of 2tp ~ 2tp tp ~ tp Lmin(t) = 2tp

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