User manual

Wide Bank 28 DS3 - Release 2.4 July 2004 Glossary-13
Glossary
Terminal
Multiplexer
Terminal Multiplexers provide simple add/drop multiplexing of SONET and standard DS1/
DS3 channels onto a single SONET bearer.
Trap A system event that results in a message being sent to a Network Management System.
Unavailable Seconds UAS. The number of seconds that an interface is unavailable. The DS3 interface is said to
be unavailable from the onset of 10 contiguous PSESs, or the onset of the condition leading
to a failure. If the condition leading to the failure was immediately preceded by one or more
contiguous PSESs, then the DS3 interface unavailability starts from the onset of these
PSESs. Once unavailable, and if no failure is present, the DS3 interface becomes available
at the onset of 10 contiguous seconds with no PSESs. Once unavailable, and if a failure is
present, the DS3 interface becomes available at the onset of 10 contiguous seconds with no
PSESs, if the failure clearing time is less than or equal to 10 seconds. If the failure clearing
time is more than 10 seconds, the DS3 interface becomes available at the onset of 10
contiguous seconds with no Press, on the onset period leading to the successful clearing
condition, whichever occurs later. With respect to the DS3 error counts, all counters are
incremented while the DS3 interface is deemed available. While the interface is deemed
unavailable, the only count that is incremented is UASs.
User Datagram
Protocol
UDP. A transport protocol offering connectionless-mode service within the Internet
protocol suite.
Wideband Services requiring 1.5 to 50 Mb/s transport capacity.