Zero-bit insertion is a particular type of bit stuffing (in the latter sense) used in some data transmission protocols, such as HDLC, to ensure that the Frame Sync Sequence (FSS) doesn't incidentally appear in a data frame.
Zero-bit insertion is a particular type of bit stuffing (in the latter sense) used in some data transmission protocols. It was popularized by IBM's SDLC (later renamed HDLC), to ensure that the Frame Sync Sequence (FSS) doesn't incidentally appear in a data frame.