Token Ring
Token ring was originally developed by IBM and then became IEEE
standard 802.5. The Token Ring network architecture uses the ring
topology and a token to provide access for workstations. The token
passes around the ring and when a workstation has the token, it can
place data on the ring. Token ring is commonly implemented as a star
with a central concentration device known as a multi-station access
unit or MAU and is technically a star ring. Token ring speeds are
either 4 or 16Mbps.
Fiber Distributed Data Interface (FDDI)
Pronounced "fiddi", FDDI is an ANSI standard and was
developed primarily as a backbone technology to interconnect LANs in a
campus environment. It runs over fiber optic cable and can span many
miles. FDDI uses two rings, one primary and one for backup. It
transmits data at 100Mbps using the token passing access method.
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