Enterasys Networks 3000 10/100BASE-TX Pin Assignments, Straight-Through Wiring

Twisted-Pair Cable Assignments
C-2 Cables and Pin-outs
10/100BASE-TX Pin Assignments
Useunshieldedtwisted‐pair(UTP)orshieldedtwisted‐pair(STP)cableforRJ‐45connections:100‐
ohmCategory3orbettercablefor10Mbpsconnections,or100‐ohmCategory5orbettercablefor
100Mbpsconnections.Alsobesure
thatthelengthofanytwisted‐pairconnectiondoesnotexceed
100meters(328feet).
TheRJ‐45portontheaccesspointiswiredwithMDIpinouts.Thismeansthatyoumustuse
crossovercablesforconnectionstoPCsorservers,andstraight‐throughcableforconnectionsto
switchesorhubs.However,whenconnectingtodevicesthatsupportautomaticMDI/MDI‐X
pinoutconfiguration,youcanuseeitherstraight‐throughorcrossovercable.
Straight-Through Wiring
Becausethe10/100MbpsportontheaccesspointusesanMDIpinconfiguration,youmustuse
“straight‐through”cablefornetworkconnectionstohubsorswitchesthatonlyhaveMDI‐Xports.
However,ifthedevicetowhichyouareconnectingsupportsauto‐MDIXoperation,youcanuse
either“straight‐through”or“crossover”cable.
Figure C-2 10/100 BASE-TX Straight-through Cable
10/100BASE-TX MDI and MDI-X Port Pinouts
Pin MDI-X Signal Name MDI Signal Name
1 Receive Data plus (RD+) Transmit Data plus (TD+)
2 Receive Data minus (RD-) Transmit Data minus (TD-)
3 Transmit Data plus (TD+) Receive Data plus (RD+)
6 Transmit Data minus (TD-) Receive Data minus (RD-)
4,5,7,8 Not used Not used
Note: The “+” and “-” signs represent the polarity of the wires that make up each wire pair.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
White/Orange Stripe
Orange
White/Green Stripe
Green
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
End A End B
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Straight-through Cable