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IC401A User Manual
Chapter 4: Troubleshooting
4. Troubleshooting
Table 4-1 provides troubleshooting tips. 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, contact Black Box Technical Support at
724-746-5500 or info@blackbox.com.
4.1 Troubleshooting Tips
Table 4-1. Problems/Causes/Solutions.
Problem Cause Solution
All LEDs on LEX
unit are off.
The LEX unit is not
receiving enough power
from the USB port or the
(optional) LEX AC adapter.
1. Ensure that the USB connection between the LEX and
host computer is properly installed.
2. Move the USB connector to another USB port on the
host computer.
All LEDs on REX
unit are off.
The REX unit is not
receiving enough power
from the AC adapter.
1. Ensure that the AC power adapter is properly connected
to the REX unit.
2. Check that the AC adapter is connected to a live source
of electrical power. Check that the REX power LED is
illuminated.
Link LEDs on LEX
unit and REX unit
are off.
There is no connection
between the LEX unit and
the REX unit.
1. Ensure CAT5 cable is connected between the LEX unit
and the REX unit. Use CAT5 or better cable, UTP with a
straight-through connector and no crossovers, and 8-pin
RJ-45 connectors at both ends.
2. Connect a short CAT5 patch cord between the LEX unit
and the REX unit to determine if the original CAT5 cable
is defective.
Extender units
were working, but
the Host LED on
the LEX/REX units
are suddenly
blinking.
The REX unit is in suspend
mode. The operating
system may put the
extender in suspend mode
when the computer is put
into a Suspend/Standby
state or when no USB
devices are attached.
1. Recover/Resume the operating system from Suspend/
Standby mode (see your operating system’s
documentation).
2. Attach a USB device to the extender.