Basic Node
3.2.2.1 Power Supply
AMM 6p B is power supplied by –48 V DC, connected to the PFU3. AMM 6p
C/D is power supplied by –48 V DC or +24 V DC, connected to the PFU3 B.
The power is distributed from the PFU3 or PFU3 B to the other units, via the
power bus in the backplane of the AMM.
The power system is made redundant using either two PFU3 or PFU3 Bs,
utilizing the redundant power bus.
Using the PSU DC/DC kit enables connection to a +24 V DC power supply,
see Section 7.2 on page 126.
+
_
+
_
PFU3 or PFU3 B
External Power Supply
9712
PFU3: –48V DC
PFU3 B: –48V DC or +24V DC
Figure 17 Power supply for AMM 6p B, C or D
PFU3/PFU3 B 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.
3.2.2.2 Cooling
Forced air-cooling is always required and provided by FAU2, which holds two
internal fans.
Air out
9707
Air in
07/NPU
06
05
04
03
02
08/FAU2
01/PFU3
00/PFU3
PFU3
PFU3
FAU2
MMU2 E 155
MMU2 F 155
NPU3
E1/DS1
E1/DS1
LTU3 12 1
E1/DS1
Figure 18 Airflow in AMM 6p
The air enters at the front on the right hand side of the AMM and exits at the
rear on the left hand side of the AMM.
15
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
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