ocr: EXAMPLEOF ATMI ADAPTATION LAYER seader Information field: ATM cell AAL = ATM Adaptation Sbytes 48bytes Layer SAR: Segmentation and assembly: POU == Protccol Data Unit SDU: = services Data Unit 4 SN SNP 4 SARPDU payload, 47 bytes SNP G Sequence Pratection Numbor bits (SDU) CSI: SN=! = sequence Convergence Number. bits Sublayer Indication CRC = Cyclic Redundancy Check CSI Sequence CRC control EvCN bit count bits bits parity AAL 1 SAR-PDU header bit Bit 1 2 3 4 5. 6 7 à 8 Figure 3, Each ATM - adaptation layer AAL) has a unique subcell structure. TheAAL-1 exchanges Service Data Units witil upper-l ...
