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1、思科第一册第九章（CISCO,Volume1,ninth）ThedifferencebetweenthestandardEthernet,fastEthernet,GigabitEthernetandGigabitEthernetisusuallycalledEthernetphysicallayer,PHY.ComplywiththeIEEEstandard802.3ethernet.Nowthroughthecableandtwistedpaircableoperationdefinesfourdatarate:10-Mbps10Base
2、-TEthernet100-MbpsFastEthernet1000-GigabitEthernetMbps10-GigabitEthernetGbpsAlthoughthesedifferentdataratewillachievemanydifferentEthernet,buthereonlyintroducemorecommonlyusedEthernetimplementationmethod.ThepictureshowssomefeaturesofEthernetPHY.ThissectionwilldiscusstheEthe
3、rnetphysicallayeroperationofthefirstpart,startingfrom10Base-T,andthendiscussthevariant10Gbps.10MbpsEthernetmainlyinclude:Theuseofcoaxialcablediameter10BASE5Theuseofcoaxialthinnet10BASE2Theuseof3kindsof/5unshieldedtwistedpaircable10BASE-TEarly10BASE5and10BASE2usingEthernetCo
4、axialCableinthephysicalbus.Themethodisnolongerusednowadays,thenew802.3standardwillnolongersupportthem.10-10BASE-TMbpsEthernet10BASE-TusesManchesterencoding,throughtwoUTPcabletransmission.Theearlyuseof10BASE-T3cable.Cablebutnowgenerallyuse5orhigherspecification.10MbpsEtherne
5、tisconsideredtraditionalEthernet,usingphysicalstartopology.Ethernetlinklengthof10BASE-Tdonotneedahuborrepeaterwithin100meters.Twoofthecablefourlinewith10BASE-T,andineachterminalwith8pinRJ-45connectorterminal.Connectedtopins1and2onthelinefortransmitting,connectedtopins3and6o
6、nthelineforreceiving.Thepictureshowsfor10BASE-TEthernetRJ45pin.ThenewLANgenerallydonotchoose10BASE-T.ButtherearestillmanyEthernet10BASE-T.Thehubinthe10BASE-Tnetworktoreplacetheswitch,greatlyincreasethethroughputofthenetwork,prolongthelifeoftraditionalethernet.Connecttothe10
7、BASE-Tlinkswitchsupportshalfduplexorfullduplexoperation.100-MbpsFastEthernetInthelate1990sestablishedseveralnew802.3StandardSpecificationformediumwith100MbpsthroughtheEthernetdatatransmissionspeed.Thesestandardsusedifferentencodingrequirementstoachievehigherdatarate.100Mbps
8、EthernetalsoknownasfastEthernet,canbeimplementedusingtwistedpaircopperorfibermedia
