
About Line Protocols
114078 Rev. A 2-13
FDDI Hardware
Bay Networks provides FDDI interfaces for multimode or single-mode 100 Mb/s
FDDI LANs, including hybrid FDDI link modules for both single-mode and
multimode fiber interfaces.
All FDDI interfaces support a Class A dual attachment or a dual homing Class B
single attachment. The FDDI link and net modules include two Media Interface
Connector (MIC) plugs as well as one RJ-11 connector for attachment to an
optional external optical bypass unit.
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.
Overview topics in this section include:
• Token Ring Topology
• Data Flow and Media Access Control
The Token Ring/802.5 interface is IEEE 802.5-compatible with IEEE 802.2
Type 1 (connectionless) and Type 2 (connection-oriented) support. You can
configure the interface to operate at 4 or 16 Mb/s to respond to different network
requirements. The interface supports IBM Type 1 and Type 3 cabling.
Token Ring Topology
Stations on a Token Ring network attach to the network using a multistation
access unit (MAU). Although the Token Ring is logically a ring, it is physically a
star, with devices radiating from each MAU
(Figure 2-7).
MAUs connect a limited number of devices, typically two, four, or eight. 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
(Figure 2-7). You must complete the ring by
connecting all RI and RO ports.
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