Technical Description
TDM bus
8489
LTU
AAU
MMU
MMU
RAU
MMU
WCDMA
GSM
RAU
RAU
Figure 37 Traffic types
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.
8490
ERICSSON
AAU
Fault
Power
BR
AAU
Figure 38 AAU
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.
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12/221 02-CSH 109 32/1-V1 Uen A 2008-03-14
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