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| Item | AAl 1 | AAL 2 | AAl 3/4 | AAL 5 |
|---|---|---|---|---|
| Service class | A | B | C/D | C/D |
| Multiplexing | No | No | Yes | Yes |
| Message delimiting | None | None | Btag/Etag | Bit in PTI |
| Advance buffer allocation | No | No | Yes | No |
| User byte available | 0 | 0 | 0 | 1 |
| CS Padding | 0 | 0 | 32-Bit word | 0-47 Bytes |
| CS protocol overhead (bytes) | 0 | 0 | 8 | 8 |
| CS checksum | None | None | None | 32-Bits |
| SAR Payload bytes | 46-47 | 45 | 44 | 48 |
| SAR protocol Overhead (Bytes) | 1-2 | 3 | 4 | 0 |
| SAR checksum | None | None | 10 bits | None |