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This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (December 2009) Segmentation and Reassembly refers to the process used to fragment and reassemble packets so as to allow them to be transported across Asynchronous Transfer Mode networks. Since ATM's payload is only 48 bytes, nearly every packet from any other protocol has to be processed in this way. Thus, it is an essential process for any ATM node. It is usually handled by a dedicated chip, called the SAR. The process is conceptually simple: an incoming packet from another protocol to be transmitted across the ATM network is chopped up into segments that fit into 48-byte chunks carried as ATM cell payloads. At the far end, these chunks are fitted back together to reconstitute the original packet. The process is analogous to the fragmentation of IP packets on reaching an interface with a Maximum Transmit Unit (MTU) size less than the packet size and the subsequent reassembly of the original packet once the fragments have reached the original packet's destination. Since different types of data are encapsulated in different ways, the details of the segmentation process vary according to the type of data being handled. There are several different schemes, referred to as ATM Adaptation Layers (AAL). The schemes are: AAL0 - Raw cells with no special format AAL1 - Constant bitrate, circuit emulation (T1, E1, etc.) AAL2 - Variable bitrate synchronous traffic, e.g. voice data AAL3/4 - Variable bitrate asynchronous traffic, e.g. Frame Relay transport AAL5 - Used for most data traffic, such as IP See also Packet segmentation Packet aggregation