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:
“Christianity came into existence to lighten the heart, but now it needs to burden the heart to start with so it can lighten it afterwards. Consequently, it will perish.”
—Friedrich Nietzsche (1844–1900)
“It would be nice to travel if you knew where you were going and where you would live at the end or do we ever know, do we ever live where we live, we’re always in other places, lost, like sheep.”
—Janet Frame (b. 1924)