
Overview of Line Protocols
1-5
Token Ring Overview
Token Ring is a 4-Mb/s or 16-Mb/s token-passing, baseband LAN that operates in
a ring topology. Token Ring conforms to the IEEE 802.5 standard. A Token Ring
LAN uses shielded or unshielded twisted-pair cable.
Token Ring Topology
Stations on a Token Ring network attach to the network using a Multi-Station
Access Unit (MAU). Although the Token Ring is logically a ring, it is physically a
star, with devices radiating from each MAU (F
igure 1-4).
Figure 1-4. Token Ring LAN
MAUs connect a limited number of devices, typically 2, 4, or 8. You can extend
the token ring by connecting the Ring Out (RO) port of one MAU to the Ring In
(RI) port of the next (r
efer to Figure 1-4). You must complete the ring by
connecting all RI and RO ports.
RI RO
RI RO
MAUs
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