Frame Control (1 byte) (FDDI)

Protocol: FDDI FDDI PCI

Field: frame control

Length: 1 byte

Contents: access and frame control.

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a

C = synchronous / asynchronous

L = address length (16 bits / 48 bits)

FF = LLC frame / MAC frame / reserved frame

ZZZZ = frame contents (SMT etc.)

Frame Type Codes

C-L-FF-ZZZZ = 0-L-00-0000 = void

C-L-FF-ZZZZ = 1-0-00-0000 = non-restricted token

(synchronous / non-restricted asynchronous)

C-L-FF-ZZZZ = 1-1-00-0000 = restricted token

(synchronous / restricted asynchronous)

MAC Frames

C-L-FF-ZZZZ = 1-L-00-0001 to

1-L-00-1111 = MAC Control Frames

C-L-FF-ZZZZ = 1-L-00-0010 = Beacon

C-L-FF-ZZZZ = 1-L-00-0011 = Claim Token

Station Management (SMT) Frames

C-L-FF-ZZZZ = 0-L-00-0001 to

0-L-00-1111 = Station Management (SMT) Frames

C-L-FF-ZZZZ = 0-L-00-1111 = next station addressing

LLC Frames

C-L-FF-ZZZZ = 0-L-01-rPPP = asynchronuous transmission / priority PPP

C-L-FF-ZZZZ = 0-L-01-rrrr = synchronuous transmission

Reserved Frames

C-L-FF-ZZZZ = C-L-10-r000 to

C-L-10-r111 = reserved for certain implementations

C-L-FF-ZZZZ = C-L-11-rrrr = reserved for future standards

FDDI: Token Passing Ring