Avaya Configuring Line Services Manual de usuario Pagina 52

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Configuring Line Services
2-14 115391-A Rev. A
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 (F
igure 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 (F
igure 2-7). You must complete the ring by
connecting all RI and RO ports.
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