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AppendixA
Link—Thetransmissionpathbetweenanytwoinstancesofgenericcabling.
MulticastMACAddress—AclassofMACaddressthatsendsapackettopotentiallymorethanone
recipient.AgroupaddressisspecifiedbysettingtheLSBofthefirstMACaddressbyteto1.
Thus,01h-02h-03h-04h-05h-06hisavalidmulticastaddress.Typically,anEthernetMAClooks
foronlycertainmulticastaddressesonanetworktoreducetrafficload.Themulticastaddresslist
ofacceptablepacketsisspecifiedbytheapplication.
PhysicalLayerandMediaNotation—ToidentifydifferentEthernettechnologies,asimple,three-field,
typenotationisused.ThePhysicalLayertypeusedbytheEthernetisspecifiedbythesefields:
<datarateinMb/s><mediumtype><maximumsegmentlength(×100m)>
ThedefinitionsforthetechnologiesmentionedinthisdocumentareinTableA-1.
TableA-1.PhysicalLayerDefinitions
TermDefinition
10Base-TIEEE802.3PhysicalLayerspecificationfora10Mb/sCSMA/CDlocalareanetworkovertwopairsof
twisted-pairtelephonewire.
100Base-TIEEE802.3PhysicalLayerspecificationfora100Mb/sCSMA/CDlocalareanetworkovertwopairsof
Category5unshieldedtwisted-pair(UTP)orshieldedtwisted-pair(STP)wire.
TwistedpairAcableelementthatconsistsoftwoinsulatedconductorstwistedtogetherinaregularfashiontoforma
balancedtransmissionline.
Port—Ethernetdevice.
PromiscuousMode—EMACreceivesframesthatdonotmatchitsaddress.
118GlossarySPRU941A–April2007
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