In digital transmission, bit slip is the loss of a bit or bits, caused by clock drift – variations in the respective clock rates of the transmitting and receiving devices.
One cause of bit slippage is overflow of a receive buffer that occurs when the transmitter's clock rate exceeds that of the receiver. This causes one or more bits to be dropped for lack of storage capacity.
One way to maintain timing between transmitting and receiving devices is to employ an asynchronous protocol such as start-stop. Alternatively, bit slip can be prevented by using a self-clocking signal (such as a signal modulated using OQPSK) or using a line coding such as Manchester encoding.
Another cause is "losing count", as on a hard drive: if a hard drive encounters a long string of 0s, without any 1s (or a string of 1s without 0s), it may lose track of the frame between fields, and suffer bit slip. Thus one prevents long strings without change via such devices as run length limited codes.
Famous quotes containing the words bit and/or slip:
“We must not leap to the fatalistic conclusion that we are stuck with the conceptual scheme that we grew up in. We can change it, bit by bit, plank by plank, though meanwhile there is nothing to carry us along but the evolving conceptual scheme itself. The philosopher’s task was well compared by Neurath to that of a mariner who must rebuild his ship on the open sea.”
—Willard Van Orman Quine (b. 1908)
“All generous minds have a horror of what are commonly called “facts.” They are the brute beasts of the intellectual domain. Who does not know fellows that always have an ill-conditioned fact or two that they lead after them into decent company like so many bull-dogs, ready to let them slip at every ingenious suggestion, or convenient generalization, or pleasant fancy? I allow no “facts” at this table.”
—Oliver Wendell Holmes, Sr. (1809–1894)