Ericsson MINI-LINK TN R4 ETSI Technical Description page 48

Technical Description
Figure 37
3.8.2 ATM Aggregation Unit (AAU)
The main function of the AAU is to aggregate traffic from other plug-in units in
the subrack. It is fitted in an AMM 6p C or D or AMM 20p B.
Figure 38
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 16.
44
WCDMA
GSM
AAU
TDM bus
LTU
Traffic types
AAU
RAU
MMU
MMU MMU
RAU RAU
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8489
AAU
8490