Straight-Through Wiring; Crossover Wiring - Nortel BES50GE-12T PWR User Manual

Pin
8
Note: The plus (+) and minus (-) signs represent the polarity of the wires that make up each
wire pair.

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 autonegotiation 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.
Straight-through wiring diagram

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 autonegotiation 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.
Copyright © 2006, Nortel Networks
.
MDI-X signal name
-48V
SMB
Using the Nortel Business Ethernet Switch 50 Series
NN47924-301 01.01 Standard
1.00 October 2006
Twisted-pair cable and pin assignments 159
MDI signal name
-48V feeding power (Negative
Vport)
Nortel Networks Confidential