Network Technologies 900GV - Manual (Page 64)

Problem Solving Using LEDs
A-6 Problem Solving
Symptom Probable Cause Corrective Action
VNbus Status
LED is off. No connection. Check that the module is properly
attached to one of the backplane
VNbus channels and that the VNbus
is connected by management
software.
VNbus
Activity LED
is off. There is low traffic
activity or no traffic
activity.
The module or any
other unit in the
MultiSwitch 900 may
not be connected to an
active VNbus channel.
If the module is
connected to an active
VNbus and the VNbus
Activity LED is off, the
module is defective.
Ensure that there is traffic activity. If
the VNbus Activity LED fails to turn
on, then turn the module off
momentarily by removing it from the
power supply. Check that the VNbus
Activity LED blinks momentarily
during the LED power–up self–test.
Connect a known active VNbus
channel to any unit in the
MultiSwitch 900.
Replace the module.
LDM Port
Status LED is
off. No link established. Check that a proper link has been
established.
Port Status
LEDs are off. No cable attached or
port is broken. Check cable type.
Port Activity
LEDs are off. There is low or no port
activity.
Ensure that the cable
has activity on it. If the
LED still fails to turn
on, the module is
defective.
Ensure that the port is present. If the
Port Activity LED stills fails to turn
on, then turn the module off
momentarily by removing it from the
power supply. Check that the Port
Activity LEDs blink momentarily
during the LED power-up self-test.
Replace the module.