User`s guide

D-20
Glossary
opposed to those automatically “learned” by the bridge).
STP (spanning tree protocol)
A protocol which ensures that only one path will be used between
two devices; prevents active loops (multiple paths to devices) by
closing certain paths. With STP operating, a redundant link serves
as a backup link only if a normal path fails.
symbol
The smallest signaling element used by the MAC sublayer. Each
symbol corresponds to a specific sequence of code bits to be
transmitted by the physical layer.
synchronous transmission
A transmission technique in which an uninterrupted block of data
is transmitted, using no redundant information such as stop and
start bits to identify the beginning and end of a unit of data.
TCP/IP (transmission control protocol/Internet protocol)
Internetworking protocols sometimes referred to as the Internet
suite of protocols.
THT (token holding timer)
A timer that controls the amount of time a station on a token
passing network may hold the token in order to transmit data.
token
A unique symbols that circulates around a network ring following
a data transmission. The token lets stations know when they can