ZERO BIT INSERTION

A bit -stuffing technique used with bit-oriented protocols to ensure that six consecutive "1" bits never appear between the two flags that define the beginning and the ending of a transmission frame . Note: When five consecutive "1" bits occur in any part of the frame other than the beginning and ending flag , the sending station inserts an extra "0" bit. When the receiving station detects five "1" bits followed by a "0" bit, it removes the extra "0" bit, thereby restoring the bit stream to its original value.