Glossary - Andrew 8212 User Manual

GLOSSARY

adapter the card installed in a PC which allows the PC to access the
token ring network.
ARL adjusted ring length. This is the total length of the cable connecting
MAUs in a single token ring, minus the shortest inter-MAU segment.
attaching device
Examples: a PC, a midrange computer such as an IBM AS/400, and a
front end processor for a mainframe computer.
backup path in a normal configuration, there is an unused pair of wires
in the twisted pair cable used in the network. This extra pair of wires,
used in conjunction with a backup circuit inside the MAUs, is called
the backup path. It can be used to provide an alternate path if part of
the ring is inoperative. See Section 3.1, Installation Background.
category 5 cable defined by the EIA/TIA for data applications up to 100
Mbps. See cable specifications in Section 2.4, Cable Specifications.
frame when an attaching device appends data to the network token, the
token becomes a frame.
LAU Lobe Access Unit. This unit allows additional attaching devices to
be connected to a network over a single MAU lobe access cable.
lobe the cable between an MAU and an attaching device.
loopback cable used with RJ45-equipped MAUs when there is only one
MAU for a ring. It connects ring in to ring out.
main ring the cable between the MAUs in a ring.
MAU Multistation Access Unit. This is the wiring concentrator in a
token ring network.
each device directly connected to the token ring.
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