Chapter 8: Troubleshooting
Testing link end hardware
Power LED is off
Meaning: Either the PSU is not receiving power from the AC/DC outlet, or there is a wiring fault in
the ODU cable.
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 power 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
Test resistance in the drop cable
Power LED is blinking
Meaning: The PSU is sensing there is an overload on the ODU port; this could be caused by a
wiring error on the drop cable or a faulty ODU.
Action: Remove the ODU cable from the PSU. Check that pins 4&5 and 7&8 are not crossed with
pins 1&2 and 3&6. Check that the resistance between pins 1&8 is greater than 100K ohms. If either
check fails, replace or repair the ODU cable.
Ethernet LED did not blink 10 times
Meaning: The ODU flashes the LED on the AC+DC Enhanced Power Injector 10 times to show that
the ODU is powered and booted correctly.
Action:
1
Remove the ODU cable from the PSU. Examine it for signs of damage. Check that the ODU
cable resistances are correct, as specified in
Test resistance in the drop cable
the ODU cable is suspect, replace it.
2
Use the LPU (if installed) to check that power is available on the cable to the ODU. Access the
connections by rotating the LPU lid as shown (slacken the lid nut but do not remove it):
Page
8-3
