Revision as of 17:16, 13 December 2007 edit Guy Harris (talk \| contribs) Extended confirmed users 75,661 edits m →Packet yype and multiplexing: Fix typo. ← Previous edit		Revision as of 17:18, 13 December 2007 edit undo Guy Harris (talk \| contribs) Extended confirmed users 75,661 edits Fix redlink. Next edit →
Line 6: Unlike most network frames, which place control information in the [[Header (information technology)\|header]], AAL5 places control information in an 8-octet [[Trailer (information technology)\|trailer]] at the end of the packet. The AAL5 trailer contains a 16-bit length [[Field (computer science)\|field]], a 32-bit [[cyclic redundancy check]] (CRC) and two 8-bit fields labeled ''UU'' and ''CPI'' that are currently unused. Each AAL5 packet is divided into an integral number of ATM cells and reassembled into a packet before delivery to the receiving [[host (~~networking~~network)\|host]]. This process is known as [[Segmentation and Reassembly]] (see below). The last cell contains padding to ensure that the entire packet is a multiple of 48 octets long. The final cell contains up to 40 octets of data, followed by padding bytes and the 8-octet trailer. In other words, AAL5 places the trailer in the last 8 octets of the final cell where it can be found without knowing the length of the packet; the final cell is identified by a bit in the ATM header (see below), and the trailer is always in the last 8 octets of that cell. ==Convergence, segmentation, and reassembly==

ATM Adaptation Layer 5: Difference between revisions