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Chapter 8: Troubleshooting
Testing link end hardware
This section describes how to test the link end hardware when it fails on startup or during
operation.
Before testing link end hardware, confirm that all outdoor drop cables, that is those that connect
the ODU to equipment inside the building, are of the supported type, as defined in
Cat5e Ethernet cable
on page 2-21.
AC Power Injector LED sequence
When the AC Power Injector is connected to the AC mains, the Power (green) LED should
illuminate within 5 seconds of connection. If this does not happen, the AC injector is either not
receiving power from the AC mains or there is a fault on the drop cable causing the power injector
to sense an over current condition on the ODU output connector.
Action: Remove the ODU cable from the PSU and observe the effect on the power LED:
•
If the power LED does not illuminate, confirm that the mains supply is working, for example
check the plug and fuse (if fitted). If the power supply is working, report a suspected PSU fault
to Cambium Networks.
•
If the Power LED does illuminate, perform
AC+DC Enhanced power injector LED sequence
For the AC+DC Enhanced power injector, the expected power-up LED sequence is:
•
The Power (green) LED illuminates steadily.
•
After about 45 seconds, the Ethernet (yellow) LED blinks slowly 10 times.
•
The Ethernet (yellow) LED illuminates steadily, then blinks randomly to show Ethernet activity.
If this sequence does not occur, take appropriate action depending on the LED states:
•
Power LED is off
on page
•
Power LED is blinking
•
Ethernet LED did not blink 10 times
•
Ethernet LED blinks ten times then stays off
•
Ethernet LED blinks irregularly
•
Power LED is on, Ethernet LED blinks randomly
If a fault is suspected in the ODU-PSU drop cable, perform
page 5-20.
Test resistance in the drop cable
8-3
on page
8-3
on page
8-3
on page
on page
8-5
(for example a short blink followed by a long blink)
Page
8-4
on page
8-5
Test resistance in the drop cable
8-2
Testing link end hardware
Outdoor copper
on page 5-20.
on
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