A concept, defined in ANSI standards, for an
optical-fiber-based
token-
ring network, featuring (a) dual counter-rotating logical rings, each with a
data transmission capacity of 100 Mb/s, (b) reliable data
transfer, (c) active
link monitoring, (d) station management, and (e)
survivability features.
Note 1: The four standards are (a) ANSI X3T9.5, containing Physical Media Dependent (PMD) specifications, (b) ANSI X3T9.5, containing the Physical (PHY) specifications, (c) ANSI X3.139, containing Media Access Control (MAC) specifications, and (d) ANSI X39.5, containing the Station Management (SMT) specifications.
Note 2: The data rate of an FDDI ring may be doubled to 200 Mb/s, with loss of
redundancy.
Note 3: FDDI-2, a second-generation FDDI network
standard, is under development.
FIBER DIGITAL DEVICE INTERFACE. FIBER DISTRIBUTED DATA INTERFACE. FDDI