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segmentation and reassembly
One
of the two sublayers of the ATM adaptation layer (AAL) common part convergence
sublayer (CPCS), responsible for dividing (at the source) and reassembling (at
the destination) the protocol data units (PDUs) passed from the CS. The SAR
sublayer takes the PDUs processed by the CS and, after dividing them into
48-byte pieces of payload data, passes them to the ATM layer for further
processing. See also AAL, ATM layer, CPCS, CS, and
SSCS.
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