10 Fault Finding
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10.1.2 Ethernet
The Ethernet LED is driven from the ODU processor and thus is capable of informing you of
many conditions using different flash sequences. If the Ethernet indicator does not illuminate
at all there are four possible conditions.
• There is no power reaching the ODU because of a wiring fault
• The ODU is faulty
• The PIDU Plus is faulty
• The Ethernet network side is faulty
Look at the following table to check the LED response for power up, disconnect the power
and reapply and note what happens.
Differentiating between 1-3 and 4 can be achieved by removing the power for 1 second.
Watch the Ethernet indicator for 1 minute while power is removed, if it never flashes then the
problem is 1-3. Take the jumper (J905) out of the PIDU Plus and check the current taken by
the ODU. This should be 300mA to 1A when starting to run normally.
If the Ethernet indicator flashes to begin with but then stops flashing, the ODU is powered and
software loaded but Ethernet connectivity has been lost between the ODU and the users
connected equipment. All Ethernet connections should be rechecked.
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