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10 Fault Finding
If communication has been lost with the unit at the near end of the link then there may be a
hardware fault with the wiring, network or hardware. Go to the hardware section below. If
communication with the far end of the link is lost then go to the radio section below.
10.1 Hardware
If there are problems suspected with the link hardware the following procedure is recommended.
10.1.1 Power
Check the power LED at each end of the link. If the power lights are illuminated go to the Ethernet
section below. If at either end they are not illuminated then
is illuminated then there is no voltage on the power wires to the ODU.
Check that the mains power is connected and switched on.
Check that the power LED illuminates if the ODU connector is disconnected at the PIDU Plus
(Open the PIDU Plus flap on the left hand side).
If it does illuminate then either the ODU is drawing too much current, or the power wiring to the
ODU is short circuit or the PSU is supplying insufficient power. The likely fault can be determined
by removing the jumper (J906), found inside the removable cover of the PIDU Plus, and measuring
the current taken with an ammeter placed across the 2 jumper pins. This is normally 10mA without
the ODU connected and 300mA to 1A when the ODU is connected.
If it does not illuminate then recheck that power is applied to the PIDU Plus by measuring the
voltage across +55V and 0V pads inside the removable cover in the PIDU Plus. Check that the
PIDU Plus is not short circuit by measuring the impedance across the Power connector. Is the led
faulty?
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.
1. There is no power reaching the ODU because of a wiring fault
2. The ODU is faulty
3. The PIDU Plus is faulty
4. 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.
21
The power indicator LED should be continually illuminated.
Fault Finding
21
check the power source. If neither
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