Technical Description
FAU1
PFU1
ICF1
+
_
+
_
+
_
+
_
FAU1
PFU1
Power supply with ICF1 Power supply without ICF1
+
_
+
_
External
Power
Supply
48 V DC
External
Power
Supply
48 V DC
10084
Figure 15 Power supply for AMM 20p B
6709
–48 V DC
Fan alarm
P
o
w
e
r
B
R
Fault
Fan
alarm
0V
PFU1
-48V DC
Figure 16 PFU1
PFU1 has one –48 V DC connector for external power supply and one
connector for import of alarms from FAU1, as the FAU1 is not connected to
the subrack backplane.
PFU1 provides input low voltage protection, transient protection, soft start and
electronic fuse to limit surge currents at start-up, or overload currents during
short circuit.
A redundant PFU1 can be extracted or inserted without affecting the power
system.
3.2.3.2 Cooling
Forced air-cooling is provided by FAU1, fitted directly above the subrack. The
air enters through the cable shelf, flows directly past the plug-in units and exits
at the top of the subrack through the air guide plate.
16
12/221 02-CSH 109 32/1-V1 Uen A 2008-03-14
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