The Start Frame Delimiter (SFD) is the 8-bit (1-byte) value marking the end of the preamble of an Ethernet frame. The SFD is immediately followed by the destination MAC address. It has the value 10101011.
The preamble of an Ethernet frame consists of a 56-bit (7-byte) pattern of alternating 1 and 0 bits, which allows devices on the network to easily detect a new incoming frame. The SFD is designed to break this pattern, and signal the start of the actual frame.
Famous quotes containing the words start and/or frame:
“Gordon: Sure, sure, I got all your copy. Why didn’t you tell me you were going to write it in Greek? I’d start a new department.
Peter: That was free verse, you gashouse palooka!”
—Robert Riskin (1897–1955)
“He drew the curse upon the world, and cracked
The whole frame with his fall.
This made him long for home, as loth to stay
With murmurers and foes;”
—Henry Vaughan (1622–1695)