Rustecat Good Stuff- EtherNet UTP Wiring
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T568a EtherNet Connector Wiring Standard
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|
Pin
|
Color
|
Pair
|
Signal
|
|
1
|
White/Green
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3
|
RX Data +
|
|
2
|
Green
|
3
|
RX Data -
|
|
3
|
White/Orange
|
2
|
TX Data +
|
|
4
|
Blue
|
1
|
Not Used
|
|
5
|
White/Blue
|
1
|
Not Used
|
|
6
|
Orange
|
2
|
TX Data -
|
|
7
|
White/Brown
|
4
|
Not Used
|
|
8
|
Brown
|
4
|
Not Used
|
|
|
T568a - Mostly found in residential installs, probably because the pair one and pair two
wire positions are identical to standard RJ-11 phone jack wiring (telco USOC wiring standard)
|
T568B EtherNet Connector Wiring Standard
|
|
Pin
|
Color
|
Pair
|
Signal
|
|
1
|
White/Orange
|
2
|
TX Data +
|
|
2
|
Orange
|
2
|
TX Data -
|
|
3
|
White/Green
|
3
|
RX Data +
|
|
4
|
Blue
|
1
|
Not Used
|
|
5
|
White/Blue
|
1
|
Not Used
|
|
6
|
Green
|
3
|
RX Data -
|
|
7
|
White/Brown
|
4
|
Not Used
|
|
8
|
Brown
|
4
|
Not Used
|
|
|
T568B - Used in most commercial installations. The performance of both T568A & T568B
standards is identical; note that for most installations, T568B is prefered and used most often
Straight-Through or Crossover Cable?
In general, patch cords used with ethernet connections are "straight-through" (P1 to P1 on each
cable end). Crossed connections are needed when two ethernet devices (i.e. two computers) are
connected directly together without a hub or switch, or if two hubs are connected together
directly. Then a "crossover" (or "flipped") cable is used, which crosses the transmit and
receive pairs. Crossover cables are wired with one end using the T568A standard and the other
end using the T568B standard.
1509
Page last edited June 24, 2011 @ 12:01 MDT