Start Delimiter Alerts each station of the arrival of a token (or data/command frame). This field includes signals that distinguish the byte from the rest of the frame by violating the encoding scheme used elsewhere in the frame.
Access-Control Byte Contains the Priority field (the most significant 3 bits) and Reservation field (the least significant 3 bits), as well as a token bit (used to differentiate a token from a data/command frame) and a monitor bit (used by the active monitor to determine whether a frame is circling the ring endlessly).
Frame-Control Bytes Indicates whether the frame contains data or control information. In control frames, this byte specifies the type of control information.
Destination and Source Addresses Two 6-byte address fields identify the destination and source station addresses.
Data Length of field is limited by the ring token holding time, which defines the maximum time a station can hold the token.
Frame-Check Sequence (FCS) Filed by the source station with a calculated value dependent on the frame contents. The destination station recalculates the value to determine whether the frame was damaged in transit. If so, the *ame is discarded.
End Delimiter Signals the end of the token or data/command frame. The end delimiter also contains bits to indicate a damaged frame and identify the frame that is the last in a logical sequence.
Frame Status A 1-byte
field terminating a command/data frame. The Frame Status field includes
the address-recognized indicator and frame-copied indicator.