The Point to Point Interface MIB module. This MIB manages the generic objects for Serial link or SONET/SDH like point to point network interfaces with the encapsulations of PPP (Point to Point Protocol), HDLC (High Level Data Link Control) or cHDLC (CIsco extension to High Level Data Link Control) framing. Acronyms and terms: FCS - Frame Check Sequence. The frame check sequence is used to ensure that the data received is actually the data sent. CRC - Cyclic Redundancy Check. The transmitting system processes the frame check sequence portion of the frame through an algorithm called a CRC (Cyclic Redundancy Check). One of the usages of CRC is in the following PPP/HLDC over SONET/SDH example. +----+ | PPP| FCS Bit SONET/SDH |HDLC|=> Generation => Stuffing => Scrambling => Framing +----+ CRC 16,32