User guide

Connecting to the web management interface Chapter 8: Troubleshooting
8-2
phn-2513_004v000 (Oct 2012)
Connecting to the web management interface
Perform this task if any problems are encountered when connecting to the PTP 800 web
interface.
Check the CMU power indicator
The CMU power indicator shows the presence of the DC supply within the CMU.
Check the state of the CMU power indicator and take action as described in Table 263.
Table 263 CMU power indicator checks
CMU power
indicator state
Likely cause and action
Green steady Continue at Check the CMU status indicator on page 8-3.
Off The DC supply may be absent or the CMU may be faulty. Continue
at Check the DC supply to the CMU on page 8-2.
Check the DC supply to the CMU
Check the DC supply at the CMU using a suitable voltmeter and take action as described
in Table 264.
Table 264 DC supply checks when CMU power indicator is off
DC supply state Likely cause and action
Absent or less than
–40.5 V
Check the AC supply, power converters, wiring, circuit
breakers and fuses as appropriate.
Reversed polarity The CMU has been damaged. Return the CMU to
Cambium for repair.
Correct polarity and
within the range –40.5 V
to –60 V.
The CMU has an internal power supply fault. Return the
CMU to Cambium for repair.