Product Description

Product Description
70 (98) © Nokia Corporation Draft DN991444
Nokia Proprietary and Confidential Issue 3-0 en Draft
6.7 Fan unit (HVMF)
The fan unit is located at the bottom of the cabinet. The master TRX controls the
fan unit via I
2
C-bus according to temperature information from other units. The
cooling is performed by adjusting the rotation speed of the fan. The adjustable
speed also minimises the noise generated by the fan unit. The fan unit has 16
speeds.
One cooling fan unit is available, applicable for all MetroSite TRX variants. The
fan details are given in Table 9 and is shown in Figure 29.
Table 8. Power supply connector types
Power supply
type
Connector type Pin configuration
230 VAC IEC 320 (male) 1 = Ground (E)
2 = Neutral (N)
3 = Live (L)
110 VAC IEC 320 (male) with a
notch
1 = Ground (E)
2 = Live 2 (L2)
3 = Live 1 (L1)
-48 VDC Anderson Power pole 1 = Ground
2 = Positive input, +36 to +60 VDC,
permitted fluctuation ±20% (or positive
input 0 V)
3 = Negative input, 0 V (or negative
input -36 to -60 VDC, permitted
fluctuation ±20%)
4 = spacer
+24 VDC Anderson Power pole 1 = Ground
2 = Positive input, 0 V (or +20 to +28
VDC, permitted fluctuation ±20%)
3 = Negative input, -20 to -28 VDC,
permitted fluctuation ±20% (or negative
input 0 V)
4 = spacer