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Diagnosing and correcting problems 339
Table 153
Corrective actions
Symptom
Probable cause
Corrective action
The switch is not
receiving AC power.
Verify that the AC power cord is fastened
securely at both ends and that power is available
at the AC power outlet.
All LEDs are off.
The fans are not
operating or the airflow
is blocked, causing the
unit to overheat.
Verify that there is sufficient space for
adequate airflow on both sides of the switch.
ATTENTION
Operating temperature for the switch must
not exceed 40
C (104 F). Do not place the
switch in areas where it can be exposed to
direct sunlight or near warm air exhausts or
heaters.
The switch is
experiencing a port
connection problem.
The Activity LED for a
connected port is off or
does not blink (and you
have reason to believe
that traffic is present).
The switch’s link
partner is not
autonegotiating
properly.
See "Port connection problems" (page 339).
Port connection problems
You can usually trace port connection problems to either a poor cable
connection or an improper connection of the port cables at either end of
the link. To remedy these types of problems, make sure that the cable
connections are secure and that the cables connect to the correct ports at
both ends of the link.
Port connection problems are also traceable to the autonegotiation mode
or the port interface.
Autonegotiation modes
Port connection problems can occur when a port (or station) is connected
to another port (or station) that is not operating in a compatible mode (for
example, connecting a full-duplex port on one station to a half-duplex port
on another station).
Nortel Ethernet Routing Switch 2500 Series
Overview — System Configuration
NN47215-500 (323162-B) 02.02 Standard
4.1 19 November 2007
Copyright © 2007, Nortel Networks
.