SMC Networks 6128L2, Installation Manual

Page: 59 / 84

T
WISTED
-P
AIR
C
ABLE AND
P
IN
A
SSIGNMENTS
B-3
Straight-Through Wiring
If the twisted-pair cable is to join two ports and only one of the ports has
an internal crossover (MDI-X), the two pairs of wires must be
straight-through. (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 B-2 Straight-through Wiring
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.
White/Orange Stripe
Orange
White/Green Stripe
Green
1
2
3
4
5
6
7
8 1
2
3
4
5
6
7
8
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Straight-through Cable
E nd A
E nd B
Blue
White/Blue Stripe
Brown
White/Brown Stripe