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You must connect all four wire pairs as shown in the following diagram to support
Gigabit Ethernet connections.
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End A
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1000BASE-T Pin Assignments
All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use
straight-through cables for all network connections to PCs or servers, or to other
switches or hubs.
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, 5e or 6 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).
Pin
MDI Signal Name
1
Bi-directional Pair A Plus (BI_DA+)
2
Bi-directional Pair A Minus (BI_DA-)
3
Bi-directional Pair B Plus (BI_DB+)
4
Bi-directional Pair C Plus (BI_DC+)
5
Bi-directional Pair C Minus (BI_DC-)
6
Bi-directional Pair B Minus (BI_DB-)
7
Bi-directional Pair D Plus (BI_DD+)
8
Bi-directional Pair D Minus (BI_DD-)
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Crossover Cable
White/Orange Stripe
Orange
White/Green Stripe
White/Blue Stripe
White/Brown Stripe
Figure B-3 Crossover Wiring
Table B-2 1000BASE-T MDI and MDI-X Port Pinouts
Twisted-Pair Cable and Pin Assignments
Blue
Green
Brown
MDI-X Signal Name
Bi-directional Pair B Plus (BI_DB+)
Bi-directional Pair B Minus (BI_DB-)
Bi-directional Pair A Plus (BI_DA+)
Bi-directional Pair D Plus (BI_DD+)
Bi-directional Pair D Minus (BI_DD-)
Bi-directional Pair A Minus (BI_DA-)
Bi-directional Pair C Plus (BI_DC+)
Bi-directional Pair C Minus (BI_DC-)
B
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End B
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B-3
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