Glossary
GL-20 Issue 8.0 July 2002
Synchronous
Refers to network elements that are timed from references traceable to a single timing source.
Synchronous Network
The synchronization of synchronous transmission systems with synchronous payloads to a master
(network clock that can be traced to a single reference clock).
SYSCTL
The System Controller and System Memory circuit packs provide the highest level of system control
for the FT-2000 OC-48 Lightwave System. The System Controller circuit pack provides overall
administrative control of the system.
SYSMEM
The System Memory and System Controller circuit packs provide the highest level of system
control for the FT-2000 OC-48 Lightwave System. The System Memory circuit pack provides
memory support for the SYSCTL circuit pack.
T
T1X1 and T1M1
The
ANSI
committees responsible for telecommunications standards.
TA
Technical Advisory.
TBOS
Telemetry Byte-Oriented Serial (Protocol) — Defines one physical interface for direct connection
between the telemetry remote and the monitored equipment. An EIA-422 port is used to provide
the operations system with enough alarm and status information to localize a problem and deter-
mine the severity.
TBP
Transmit Byte Processor — A device on the OC48 TRMTR and OC48 REGENR circuit packs.
TCA
Threshold-Crossing Alert — A condition set when a counter exceeds a user-selected high or low
threshold. A TCA does not generate an alarm but is available on demand through the CIT.
TEC
Thermo-Electric Cooler.
TG3 (DS1)
The FT-2000 OC-48 Lightwave System Timing Generator, Stratum 3 - DS1 circuit pack gener-
ates clock signals for distribution to the transmit circuits. It operates in the free running, loop timed,
through timed, externally timed, and holdover modes.
Through Timed
Refers to a network element that derives its transmit timing in the east direction (Line 1E) from a
received line signal in the west direction (Line 1W) and the transmit timing in the west direction
(Line 1W) from a received line signal in the east direction (Line 1E).
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