rings), and Intraring TSI (within rings).
TIRKS
Trunks Integrated Records Keeping System
TL1
Transaction Language 1
TR
Telcordia Technologies Technical Requirement
Transaction Language One (TL1)
A machine-to-machine communications language that is a subset of ITU’s human-machine
language.
Tributary
A path-level unit of bandwidth within a port, or the constituent signal(s) being carried in this
unit of bandwidth, for example, an STS-1 tributary within an OC-N port.
TSA
Time Slot Assignment
TSI
Time Slot Interchange
TSO
Technical Support Organization
....................................................................................................................................................................................................................................
U
UAS
Unavailable Seconds
Unavailable Seconds (UAS)
In performance monitoring, the count of seconds in which a signal is declared failed or in
which 10 consecutively severely errored seconds (SES) occurred, until the time when 10
consecutive non-SES occur.
Unidirectional Path-Switched Ring (UPSR)
Path-Switched rings employ redundant fiber optic transmission facilities in a pair configuration,
with one fiber transmitting in one direction (for example, East) and the backup fiber
transmitting in the other direction (for example, West). If the primary ring fails, then the
protection ring takes over.
UPD/INIT
Update/Intialize
....................................................................................................................................................................................................................................
365-372-333 R2.1
Issue 4, June 2005
Lucent Technologies
G L O S S A R Y
G L - 2 7