Operation Manual

Nokia MetroSite GSM Base Station, Requirements for Installation and Operation
26 (38) © Nokia Networks Oy Internal Copy DN9913471
Issue 1 en DRAFT 2 Draft
3.6.2 Acoustic sound power
The fan unit of the Nokia MetroSite GSM BTS generates acoustic noise. The
level of acoustic sound power is dependent on the following factors:
• Ambient temperature
• Rate of the temperature change
• Ouput power
The acoustic sound power level is higher when the ambient temperature is
changing rapidly. Refer to Figure 5 for the range of acoustic sound power level in
different ambient temperatures.
Figure 5. Range of acoustic sound power generated by Nokia MetroSite
GSM BTS
TAmb
Acoustic sound power
30
35
40
45
50
55
Fan off
-50 -40 -30 -20 -10 0 +10 +20 +30 +40 +50 +60
o
F
+32
+68
+122
+14
-40
-22
-4
+50
+104
+140
+86
o
C
-58
60
dB(A)
outdoor
indoor