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trunk up-down
A protocol used in
Asynchronous Transfer Mode (ATM) networks that monitors trunks and detects when
one goes down or comes up. ATM switches send regular test messages from each
trunk port to test trunk line quality. If a trunk misses a given number of
these messages, TUD declares the trunk down. When a trunk comes back up, TUD
recognizes that the trunk is up, declares the trunk up, and returns it to
service. See also trunk.
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