Glossary
GL-20 Issue 3 June 2000
T1X1 and T1M1
The
ANSI
committees responsible for telecommunications standards.
TA
Telcordia Technologies Technical Advisory
TAB S
Telemetry Asynchronous Byte Serial (Protocol)
TAR P
Target Address Resolution Protocol
TBOS
Telemetry Byte-Oriented Serial (Protocol) — Defines one physical interface for direct connection
between the telemetry remote and the monitored equipment. An RS-422 port is used to provide the
operations system with sufficient alarm and status information to localize a problem to a given
DDM-2000 and to determine the severity of the problem.
TCA
Threshold-Crossing Alert — A condition set when a performance-monitoring counter exceeds a
user-selected threshold. A TCA does not generate an alarm but is available on demand through the
CIT and is shown by TBOS and causes a message to be sent to NMA via the X.25/TL1 interface.
TCVCXO
Temperature-Compensated Voltage-Controlled Crystal Oscillator — A highly stable and accurate
clock source used in the DDM-2000 TGS circuit pack.
TGS
The timing generator circuit pack generates clock signals for distribution to the transmit circuits. It
operates in the free-running, loop-timing, phase-lock, and holdover modes.
TID
Target Identifier — The Telcordia Technologies name for the system name.
TL1
Transaction Language 1 — A Telcordia Technologies machine-to-machine communications lan-
guage that is a subset of ITU-TSS, formerly CCITT's, human-machine language.
TLB
Timing Looped Back — Used in synchronization messaging.
TOP
Task Oriented Practice
TR
Telcordia Technologies Technical Requirement
TSA
Time Slot Assignment
TSI
Time Slot Interchange
TSO
Technical Support Organization — Supports RTAC and the customers.
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