
Crossoverisusedforhubtohub,computertocomputer,wherevertwo‐waycommunication
isnecessary.AllgigabitEthernetequipment,andmostnew10/100Mbequipment,supports
automaticcrossover,meaningthateitherastraight‐throughorcrossovercablemaybeused
foranyconnection.However, olderequipment requirestheuseofa
strai ght‐throughcable
toconnectaswitchtoaclientdevice,andacrossovercabletoconnectaswitchtoaswitch
oraclienttoaclient.
8P8CWiring(T568A)
PinPairWire Color
1 3 1
white/green
2 3 2
green
3 2 1
white/orange
4 1 2
blue
5 1 1
white/blue
6 2 2
orange
7 4 1
white/brown
8 4 2
brown
Pinson8P8Cplugface
Twistedpaircablesareoftenshieldedinattempttopreventelectromagneticinterference.
Becausetheshieldingismadeofmetal,itmayalsoserveasaground.However,usuallya
shieldedorascreenedtwistedpaircablehasaspecialgroundingwireaddedcalledadrain
wire.Thisshieldingcan
beappliedtoindividualpairs,ortothecollectionofpairs.When
shieldingisappliedtothecollectionofpairs,thisisreferredtoasscreening.Theshielding
mustbegroundedfortheshieldingtowork.
8P8CWiring(T568B)
Pin Pair Wire Color
1 2 1
white/orange
2 2 2
orange
3 3 1
white/green
4 1 2
blue
5 1 1
white/blue
6 3 2
green
7 4 1
white/brown
8 4 2
brown
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