Vol. VI-B-34 Alcatel-Lucent
3. If BER alarms coincide with low RSL and just one end of the link is affected,
a remote RAC or ODU equipment problem is indicated. Check remote
Detected Forward Power and Tx alarms.
Additional Information
Rain fade is the likely cause of fade for links 13 GHz and higher. Diffraction and
multipath/ducting for links 11 GHz and lower. If these alarms are persistent,
there could be a problem with the link design or original installation.
Check that all other link health indicators are normal before investigating an
interference problem. Then check for any new link installations in the same
geographical area, on the same frequency band, which coincide with the onset of
BER alarms. Confirming interference may require use of a spectrum analyzer.
XPIC Cable Unplugged
No signal is detected at the XPIC input connector. This is a warning alarm.
Probable Cause
Cable unplugged or equipment malfunction.
Recommended Actions
Check the cables.
Replace the RAC 40.
ODU PA Current
ODU PA current out of tolerance. This is a warning alarm.
Probable Cause
Equipment malfunction.
Recommended Actions
Replace the ODU.
Additional Information
A fault condition is more likely to be raised on the PA current-high alarm limit
rather than current-low, in which case correlation may be found with one or more
of the ODU temperature alarms and/or an abnormal Forward Power
measurement. Noise and errors may also be introduced on the transmitted signal,
which may show as abnormal BER and ES figures at the remote end.
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