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

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Presentation transcript:

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 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

Application Presentation Session Transport Network Datalink Physical Medium Physical Medium MAC LLC OSIIEEE 802 Upper Layers 802

Sublayers of IEEE 802 Logical Link Control –802.2 –SAPs to the upper layer –Assembly/Reassembly of frames –Addresses and fields for error detection Medium Access Control –802.3, 802.4, 802.5, , –Arbitrar el acceso al medio físico –Varias MACs para una sola LLC

Transmission in the BUS

Colission

Ethernet 10 Mbps Medium Access Control (MAC) Ethernet 10Base5 Thick coaxial 10Base5 Thick coaxial 10Base2 Thin Coaxial 10Base2 Thin Coaxial 10BaseT Twisted Pair 10BaseT Twisted Pair 10BaseF Fiber Optic 10BaseF Fiber Optic 10Broad36 Coaxial 10Broad36 Coaxial

10Base5

10Base2

10BaseT

Switches Filter frames –With MAC destination address –damaged (CRC) –incomplet Self learning of addresses/port –Based on source MAC address Switching made by hardware Store-and-forward y cut-through

HUB

SWITCH

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

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

Importance of 2t p tptp ~ t p ~ 2t p L min (t) = 2t p