11 Lightning Protection
162
11.3.2 Post-Power Testing
The Correct Operation is as follows
1. Connect the RJ45 to the PIDU and apply power to the PIDU, the power LED should
illuminate continuously.
2. After 30 seconds, the Ethernet LED should be observed starting with 10 slow flashes.
3. If there is a network connection the Ethernet LED will then show Ethernet activity.
If the system does not operate correctly, refer to the fault finding guide below:
The PIDU Green power LED does not illuminate
Unplug the ODU connection from the PIDU and check the power LED illumination. If the
power LED still does not light then check the power source.
The PIDU Green power LED flashes
A flashing power LED indicates that there is a short circuit on the output of the PIDU. Check
that pins 4&5 and 7&8 are not crossed with pins 1&2 and 3&6 on the RJ45, and also greater
than 100K ohms between pins 1&8
The Ethernet LED flashes ten times but does not show Ethernet activity
Failure of the Ethernet LED to show Ethernet activity can be due to wiring to pins 1&2 and
3&6 being incorrect, for example if the wiring to pins 1 and 3 are crossed.
The Ethernet connection to the network is only 10/100 BaseT, when 1000 BaseT was
expected
It is likely there is a fault with the wiring to pins 4&5 and 7&8.
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