Labels:text | screenshot | display | font | number OCR: EXAMPLE OF ATM ADAPTATION LAYER ATM cell Header. Information field AAL = ATM Adaptation. 5 bytes 18 liftes Layer SAR = Segmentation and Assembly POU = Protocol Data Unit SDU = Services Data Unit SN SNP SAR POU payload, 47 bytes SNP # Sequence Number 4 Protection bits :01ts (SDU) SN = Sequence Number CSI = Convergence Sublayer Indication CRC = Cyclic Redundancy Check CSI Sequence CRC control Even count bits bits parity AAL 1 SAR-PDU header BitŮ 12 3 4 5 6 Figure 3. Each ATM adaptation layer (AAL) has a unique subcell structure. The AAL-I exchanges Service Data Units with upper-layer protocols and applications. It also transmits upper-layer service characteristics that indi- cate transmission errors.
