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SN User's Guide - ESC Home - NASA

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T s<br />

receiving system noise temperature (K) referenced to the antenna output<br />

terminals<br />

TSW TDRSS Scheduling Window<br />

TT&C tracking, telemetry, and command<br />

TTM Time Transfer Message<br />

TURFTS TDRSS User RF Test Set<br />

TUT TDRSS Unscheduled Time<br />

TWTA Traveling Wave Tube Amplifier<br />

Tx transmitter<br />

UAV User Antenna View<br />

UDP User Datagram Protocol<br />

UIFC User Interface Channel<br />

UPD User Performance Data (from NCCDS to MOC)<br />

UQPSK unbalanced quadriphase shift keying<br />

USCCS User Spacecraft Clock Calibration System<br />

USM User Schedule Message (from NCCDS to MOC)<br />

USS User Services Subsystem<br />

UTC Universal Time Coordinated<br />

VCDU Virtual Channel Data Units<br />

VIC Vehicle Identification Code<br />

VID Vehicle Identification<br />

VOIP Voice Over Internet Protocol<br />

VSWR Voltage Standing Wave Ratio<br />

W West<br />

WAN wide area network<br />

WDISC WSC Data Interface Service Capability<br />

WSC White Sands Complex (consists of WSGT and STGT)<br />

WSGT White Sands Ground Terminal<br />

www world wide web<br />

ZOE zone of exclusion<br />

Revision 10 GL-14 450-<strong>SN</strong>UG

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