Common Part Convergence Sublayer (CPCS) is one of two AAL sublayers in the ATM layer model
.The CPCS sublayer is service-independent and is divided into the Convergence Sublayer (CS) and the Segmentation and Reassembling
Sublayer (SAR). In CPCS, thedata
isprepared for transport over the ATM network and the 48-byte user data units (payload
) are generated. When the user data passes through CPCS, the header and trailer are added.