protocol A protocol which guarantees the receiver of

synchronous data can recover the sender's clock. When the

data stream sent contains a large number of adjacent bits

which cause no transition of the signal, the receiver cannot

adjust its clock to maintain proper synchronised reception.

To eliminate the possibility of such a pathological case, when

a preset number of transitionless bits have been transmitted,

a bit which does cause a transition is "stuffed" (transmitted)

by the sender. The receiver follows the same protocol and

removes the stuffed bit after the specified number of

transitionless bits, but can use the stuffed bit to recover

the sender's clock.