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AppendixA
JumboPackets—Jumboframesaredefinedasthosepacketswhoselengthexceedsthestandard
EthernetMTU,whichis1500kbytes.FortheC64x+devices,itisrecommendednottousepackets
exceeding35Kinlength.ThePHYthatyouusecanplaceadditionallimitsontothelengthofthe
packetsthatyoucantransferinasystem.
Link—Thetransmissionpathbetweenanytwoinstancesofgenericcabling.
MulticastMACAddress—AclassofMACaddressthatsendsapackettopotentiallymorethanone
recipient.AgroupaddressisspecifiedbysettingtheLSBofthefirstMACaddressbyte.Thus,
01h-02h-03h-04h-05h-06hisavalidmulticastaddress.Typically,anEthernetMAClooksforonly
certainmulticastaddressesonanetworktoreducetrafficload.Themulticastaddresslistof
acceptablepacketsisspecifiedbytheapplication.
PhysicalLayerandMediaNotation—ToidentifydifferentEthernettechnologies,asimple,three-field,
typenotationisused.ThePhysicalLayertypeusedbytheEthernetisspecifiedbythesefields:
<datarateinMb/s><mediumtype><maximumsegmentlength(×100m)>
Thedefinitionsforthetechnologiesmentionedinthisguideareasfollows:
TableA-1.PhysicalLayerDefinitions
TermDefinition
10Base-TIEEE802.3PhysicalLayerspecificationfora10Mb/sCSMA/CDlocalareanetworkovertwo
pairsoftwisted-pairtelephonewire.
100Base-TIEEE802.3PhysicalLayerspecificationfora100Mb/sCSMA/CDlocalareanetworkovertwo
pairsofCategory5unshieldedtwisted-pair(UTP)orshieldedtwisted-pair(STP)wire.
1000Base-TIEEE802.3PhysicalLayerspecificationfora1000Mb/sCSMA/CDLANusingfourpairsof
Category5balancedcoppercabling.
TwistedpairAcableelementthatconsistsoftwoinsulatedconductorstwistedtogetherinaregularfashionto
formabalancedtransmissionline.
Port—Ethernetdevice.
PromiscuousMode—EMACreceivesframesthatdonotmatchitsaddress.
146GlossarySPRU975B–August2006
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