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1000BASE-T P
IN
A
SSIGNMENTS
February 2003 © 2003 Foundry Networks, Inc. B-5
1000BASE-T Pin Assignments
The table below shows the 1000BASE-T MDI and MDI-X port
pinouts. These ports require that all four pairs of wires be
connected. Note that for 1000BASE-T operation, all four pairs of
wires are used for both transmit and receive.
Use 100-ohm Category 5 or 5e unshielded twisted-pair (UTP) or
shielded twisted-pair (STP) cable for 1000BASE-T connections.
Also be sure that the length of any twisted-pair connection does
not exceed 100 meters (328 feet).
Pi
n
MDI Signal Name MDI-X Signal Name
1Transmit Data plus
(TD1+)
Transmit Data plus (TD2
+)
2 Receive Data minus
(RD1-)
Receive Data minus
(RD2-)
3Transmit Data plus
(TD2+)
Transmit Data plus
(TD1+)
4Transmit Data plus
(TD3+)
Transmit Data plus
(TD4+)
5 Receive Data minus
(RD3-)
Receive Data minus
(RD4-)
6 Receive Data minus
(RD2-)
Receive Data minus
(RD1-)
7Transmit Data plus
(TD4+)
Receive Data minus
(RD3+)
8 Receive Data minus
(RD4-)
Receive Data minus
(RD3-)