ATM adaptation layer 2
- Concept introduced by Ericsson on ISS-95 (1995)
- Bandwidth efficient transmission of low rate, short and variable length packets in delay sensitive applications
- Several (up to 248) AAL2 user information streams are multiplexed on the same ATM connection.
- Standardized in ITU-T I.366, I.363, Q.2630
- Ericsson owns the “AAL2 patent”
- Inventor: Lars-Göran Petersen
- Cello supports:
- node internal AAL2 connections
- network wide AAL2 connections
- Cello may also act as a pure AAL2 switch
- CPS is implemented on ET as AAL2 multiplexor/demultiplexor
- SSSAR is implemented on SPM (or application device)
- AAL2U is the interface between CPS and SSSAR
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