802.3 MAC Layer Frame

Preamble

Start of Frame Delimiter

Destination Address

Source Address

Length

Data

Pad

Frame Check Sequence

In asynchronous transmission, each byte is sent separately, in a 10-bit frame.

In 802.3 MAC Layer frames, transmission is synchronous.

Many data bytes are sent in each frame of variable length.

Frames must be between 64 octets and 1518 octets long, divided into groups of bits called fields.

Field lengths are measured in “octets”, eight bits.

“Octet” is a synonym for “byte”