Ericsson MINI-LINK TN R4 ETSI Technical Description page 52

Technical Description
3.8.2.1.6 Power
This block interfaces the Power bus and provides secondary voltages for the
unit. All plug-in units have a standard power module providing electronic soft
start and short circuit protection, filter function, low voltage protection, DC/DC
converter and a pre-charge function.
3.8.2.2 Fault Management
The AAU supports the handling of F4/F5 O&M functions for Fault Management
(FM), according to ITU-T I.610. The following FM indications are used:
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The AAU is transparent to Continuity Check (CC) and Loopback (LB) cells,
for monitoring continuity and detection of ATM layer defects in real time.
12/221 02-CSH 109 32/1-V1 Uen A 2008-03-14