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Table 155 Corrective actions
Symptom
All LEDs are off.
The Activity LED for a
connected port is off or
does not blink (and you
have reason to believe
that traffic is present).
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).
The Ethernet Switch 325/425 negotiates port speeds according to the IEEE 802.3u
autonegotiating standard. The switch adjusts (autonegotiates) its port speed and
duplex mode to match the best service provided by the connected station, up to
100 Mb/s in full-duplex mode as follows:
Probable cause
The switch is not receiving AC
power.
The fans are not operating or
the airflow is blocked, causing
the unit to overheat.
The switch is experiencing a
port connection problem.
The switch's link partner is not
autonegotiating properly.
Chapter 13 Troubleshooting
Corrective action
Verify that the AC power cord is fastened securely
at both ends and that power is available at the AC
power outlet.
Verify that there is sufficient space for adequate
airflow on both sides of the switch.
Note: 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.
See
"Port connection
problems".
System Configuration Guide
407
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