Specifications

B.1 The Dual Ring
B–2 FDDI Overview
All FDDI networks operate as logical token rings, where the right to transmit is
granted by the possession of a token. There is one token per ring, and it is passed
from station to station, according to a set of rules known as the timed token protocol.
A station wishing to transmit on the ring first captures the token. It then transmits
frames for a period of time determined by the timed token rules, and then releases the
token immediately after completing its transmission.
A transmitting station is also responsible for removing the frames it transmitted from
the ring, once they have circled the ring and returned to the station. This process is
called frame stripping.