Crossover Wiring; 1000Base-T Pin Assignments - SMC Networks E21011 User Manual

| Cables and Pinouts
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PPENDIX
Twisted-Pair Cable Assignments
C W
ROSSOVER IRING
1000BASE-T P
IN
A
SSIGNMENTS
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.
Figure 69: Crossover Wiring
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Crossover Cable
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End A 2
3
4
5
6
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8
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,
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).
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White/Orange Stripe
Orange
White/Green Stripe
Blue
White/Blue Stripe
Green
White/Brown Stripe
Brown
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End B
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