Instruction manual

USB221EXT Instruction Manual
9
Troubleshooting
The following table provides troubleshooting help. The topics are arranged
in the order in which they should be executed in most situations. If you are
unable to resolve the problem after following these instructions, please
contact technical support for further assistance (see page 12).
Symptoms/Cause Remedy
All LEDs on Local unit
and Remote unit are
off.
Cause:
The USB221EXT is not
receiving power from
the adapter
1. Ensure that the power adapter is connected to
the Local unit and Remote unit
2. Check that the adapter is connected to a live
source of electrical power
Link LEDs on Local unit
and Remote unit are
off.
Cause:
There is no connection
between the Local unit
and Remote unit.
1. Ensure that a Category 5 UTP cable with
straight-through conductors is connected
between the Local unit and Remote unit.
2. Connect a short Category 5 patch cord
between the Local unit and Remote unit.
Recheck the operation of the system.
Link LED on Local unit
is on;
Host LED on Local unit
is off.
Cause:
a) The computer is not
functioning.
b) The Local unit is not
connected to the
computer.
c) The computer does
not support USB
hubs.
d) The USB221EXT is
malfunctioning.
1. Disconnect all USB devices from the Remote
unit.
2. Disconnect the Local unit from the computer.
3. Disconnect and then reconnect the power
adapter to the USB221EXT.
4. Reconnect the Local unit to the computer.
5. In the Universal Serial Bus controllers section
of Device Manager, check that the
USB221EXT is recognised as a “Generic USB
Hub”.
6. If the USB221EXT is not recognised, contact
technical support for assistance (see page
12).