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Crossover Wiring
If the twisted-pair cable is to join two ports and either both ports are labeled with an
"X" (MDI-X) or neither port is labeled with an "X" (MDI), a crossover must be
implemented in the wiring. (When auto-negotiation is enabled for any RJ-45 port on
this switch, you can use either straight-through or crossover cable to connect to any
device type.)
You must connect all four wire pairs as shown in the following diagram to support
Gigabit Ethernet connections.
1
End A
2
3
4
5
6
7
8
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 Data One Plus (BI_D1+)
2
Bi-directional Data One Minus (BI_D1-)
3
Bi-directional Data Two Plus (BI_D2+)
4
Bi-directional Data Three Plus (BI_D3+)
5
Bi-directional Data Three Minus (BI_D3-)
Twisted-Pair Cable and Pin Assignments
10/100BASE-TX Crossover Cable
White/Orange Stripe
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
Orange
Blue
Green
Brown
MDI-X Signal Name
Bi-directional Data Two Plus (BI_D2+)
Bi-directional Data Two Minus (BI_D2-)
Bi-directional Data One Plus (BI_D1+)
Bi-directional Data Four Plus (BI_D4+)
Bi-directional Data Four Minus (BI_D4-)
B
1
2
End B
3
4
5
6
7
8
B-3
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