Ericsson MINI-LINK TN R4 ETSI Technical Description page 21

Basic Node
If the indoor location has other fan units, which provide sufficient cooling
through the subrack, the FAU1 can be omitted. However, air filters should be
present in the cabinet door.
Complete rules for cooling are available in MINI-LINK TN ETSI Product
Specification.
Air Guide Plate
Air out
FAU1
AMM 20p B
Cable Shelf
Air in
10071
Figure 17 Side view of the airflow in AMM 20p B
Pow er A
-48V
Alar m A
Pow er B
Alar m B -48V
Fau lt
Pow er FA N UN IT
Fan alarm
Fan alarm
A B
–48 V DC –48 V DC
A B
6710
Figure 18 FAU1
FAU1 has an automatic fan speed control and houses three internal fans.
FAU1 has two –48 V DC connectors for redundant power supply. Two
connectors are also available for export of alarms to PFU1.
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