FDDI Frame Structure ( ~ IEEE 802.5)

• sd = start delimiter & ed = end delimiter

• ac = access control for priority & reservations

• fc = frame control, types of frames

• fcs = frame (error) check sequence, CRC-32

• fs = frame status

sd ac fc dest src data fcs ed fs

1 1 1 2/ 6 2/ 6 var 4 1 1

sd ac ed

=> Token

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