Vol. VI-B-20 Alcatel-Lucent
Power Detector Temperature
Power detector temperature out of range. This is a warning alarm.
Probable Cause
1. The ODU is faulty due to an overheating problem, or a faulty temperature
sensor.
2. Excessive environmental temperature. The ambient must not exceed 55
o
C
(131
o
F), which is a shaded temperature limit (no solar gain).
Recommended Actions
1. Check for other ODU related over-temperature alarms: IF Temperature and
Transceiver RX Temperature. Also check the PA Current alarm.
2. Use the CT Performance screen to check ODU Temperature and Detected Tx
Power. ODU Temperature should not more than 90°C, and then only in
extreme ambient and maximum Tx power conditions. If Detected Tx Power
is not normal, this may be as a result of general overheating, or a component
failure.
• If there is correlation between other temperature alarms and/or the ODU
Temperature reading, a general overheating of the ODU is indicated. If
this cannot be associated with very high ambient temperatures, a faulty
ODU is indicated. The ODU must be replaced.
• If there are no other alarms, the ODU Temperature is normal, Detected Tx
Power is normal, and the ambient is not high, then a localized alarm
measurement fault is indicated. The ODU should be replaced.
3. Where an environmental temperature problem is suspected, use the CT
Events Browser and History screens to see if there is an alarm pattern
associated with ambient temperature and sun position. If confirmed, a sun
shield should be installed for the ODU.
Additional Information
This temperature output is used to maintain correct PA calibration over
temperature. It is also presented in the CT Performance screen as ODU
temperature.
Solar gain on the ODU can add 10
o
C or more to the internal ODU temperature,
therefore in ambients in excess of 45
o
C (113
o
F), solar gain can result in
over-temperature situations.
Detected Tx Power should be within 2 dB (typically within 1 dB) of the Tx
power setting in a RAC Plug-ins screen when ATPC is disabled. In situations
where ATPC is selected, refer to the commissioning record for guidance on a
normal Tx power indication.
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