Ericsson MINI-LINK TN R3 ETSI Technical Description page 23

3.2.3.1 Power Supply
AMM 20p is power supplied by –48 V DC, connected to the PFU1 or via an
Interface Connection Field (ICF1). The power is distributed from the PFU1 to
the plug-in units, via the power bus in the backplane of the AMM.
The power system is made redundant using two PFU1s, utilizing the redundant
power bus.
The PSU DC/DC kit enables connection to +24 V DC power supply, see Section
7.2 on page 126. The ICF1 is not used in this installation alternative.
Power supply with ICF1
_
External
+
Power
_
Supply
+
–48 V DC
PFU1
Figure 20 Power supply for AMM 20p
Figure 21
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 AMM backplane.
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
ICF1
FAU1
Fan alarm
–48 V DC
PFU1
Power supply without ICF1
_
+
External
_
Power
+
_
Supply
_ +
–48 V DC
+
PFU1
Basic Node
FAU1
6709
17
6708