2-5
Troubleshooting
T
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LED Operation
The tables on the following pages list the hub’s LEDs, their possible states,
and diagnostic tips to resolve any error conditions.
LED patterns indicating problems
Diagnostic Tips
Power
Coll
Port LED
Fault
ON
*
OFF
*
Check cabling on the indicated port all the way
out to the device attached to that port. Faulty
wiring or a bad connection could exist
somewhere in that connection.
The end node or hub attached to the port is off.
The port may be disabled. Use the ASCII
console or management application to enable
the port.
If Port 1, check the position of the
MDI/MDI-X switch. See the figure in chapter 1
that details the MDI/MDI-X switch.
ON
ON
*
*
Very frequent collisions are occurring, which
could indicate a network fault or improperly
terminated cable.
ON
*
Slow
Flash
Slow
Flash
The port has been auto-partitioned because of
an excessive collision condition. Check cable
connections and status of attached network
devices for causes of the excess collisions. The
hub will automatically recover after certain IEEE
802.3 criteria are successfully met.
ON
*
Fast
Flash
*
Network management security violation
occurred. See Port Security in Browser
Interface or ASCII Console Interface.
ON
*
*
ON
The hub has failed its self-test. Power-cycle the
hub. If this condition persists, call your HP-
authorized LAN dealer or HP representative for
assistance.
*This LED is not important for the diagnosis.
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