Ericsson MINI-LINK TN R3 ETSI Technical Description page 43

Figure 38
3.7.2 ATM Aggregation Unit (AAU)
The main function of the AAU is to aggregate traffic from other plug-in units in
the AMM. It is fitted in an AMM 6p B, C, D or AMM 20p.
Figure 39
The AAU has no front connectors but interfaces up to 96 E1s in the backplane.
The E1s can be used as single links with G.804 mapping or combined into
IMA groups. Each G.804 link or IMA group corresponds to one internal ATM
interface and the maximum number of ATM interfaces handled by the AAU is 31.
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
WCDMA
GSM
AAU
TDM bus
LTU
Traffic types
AAU
RAU
MMU
MMU MMU
RAU RAU
Basic Node
8489
AAU
8490
37