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bit stuffing

Inserting bits in data in order to break up a bit pattern that may cause the transmission to go out of synchronization. For example, in T1 lines, timing is maintained by detecting a change from 0 to 1. If too many zero bits are transmitted consecutively, the receiving end may lose synchronization because too much time has passed without sensing voltage. Therefore, in long strings of zeros, a set of bits that begins with a 1 and functions as a timing signal is "stuffed" into the stream of zeros at certain intervals.

When bits are added to fill out the remainder of a field or frame, it is known as "bit padding." See padding.



padding

Bits or characters that fill up unused portions of a data structure, such as a field, packet or frame. Typically, padding is done at the end of the structure to fill it up with data, with the padding usually consisting of 1 bits, blank characters or null characters. See null and bit stuffing.



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