An alternate method used by older T carrier equipment to locate ATM cell boundaries. This method has recently been moved to an informative appendix of the ATM DS3 specification and has been replaced by the HEC method.

Physical Layer Convergence Procedure which maps the frames to the medium.

physical layer convergence protocol. Protocol defined for use with Switched Megabit Data Service. Used on DS3 ATM trunks in the BPX switch.