363-206-208
Glossary
Issue 5 June 2000
GL-19
T
T1X1 and T1M1
The ANSI committees responsible for telecommunications standards.
TABS
Telemetry Asynchronous Byte Serial (Protocol).
TARP
TID Address Resolution Protocol. TARP supports multi-vendor operation and allows
partitioning of large subnetworks.
TBOS
Telemetry Byte-Oriented Serial (Protocol) — Defines one physical interface for direct
connection between the telemetry remote and the monitored equipment. An EIA
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. TBOS is not available in OC-12, Release 7 or OC-3, Release 13.
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, 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
TL1
Transaction Language 1 — A machine-to-machine communications language that is a
subset of ITU’S (formerly CCITT) human-machine language.
TMUX
Trans-mux or trans-multiplex. The new TMUX circuit pack (BBG20) provides path termi-
nation functions for an M13 or C-bit parity DS3 signal. It demultiplexes the DS3 into 28
DS1s, performs DS1 PM, maps each DS1 into a VT1.5, and multiplexes the 28 VT1.5s
into an STS-1.
TOP
Task Oriented Practice.
Summary of Contents for DDM-2000 OC-12
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