ATM Adaptation Layer 2
(AAL2)
•Variable bit rate traffic
•i.e.
•Compressed audio
Figure 20.13
Information
CS Sub-Layer
Header
Payload
Trailer
1 45                   2    bytes
SAR Sub-layer
- -  - - - -  -
CSI
SC
IT
1 bit       3 bits       4 bits                                       6 bit       10 bits
Payload
LI
FEC
Cell header
Payload
ATM Layer
Cell Header
Payload