Acronyms :: S-Z

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S

S – Second
S+DX – Speech Plus Duplex
S/N – Signal-to-Noise Ratio
SAC – Strategic Air Command (USAF)
SADA – Solar Array Drive Assembly
SADE – Solar Array Drive Electronics
SAE – Society of Automotive Engineers
SAGR – Supergroup Automatic Gain Regulator
S/C – Spacecraft
S/C – Suppressed Carrier
SCC – Satellite Control Center
SCF – Satellite Control Facility
SCPC – Single Channel Per Carrier, PCM/PSK Telecommunications Equipment
SCPDM – Suppressed Clock Pulse Duration Modulation
SCR – Silicon Controlled Rectifier
SCTO – Stalled Call Timed Out
SCU – System Control Signal Unit
SD – Speech Detector
SDCU – Satellite Delay Compensation Unit
SDF – Supergroup Distribution Frame
SDLC – Synchronous Data Link Control
SDMA – Space Division Multiple Access
S+DX – Speech+Duplex (Simultaneous Speech & Telephony in a Voice Channel
SECAM – Sequential Color with Memory – A color television system developed in France using 625 lines and 50 fields with a bandwidth of 6 MHz
SEM – Space Environment Monitor
SEN – SENSE command
SES – Ship Earth Station (Inmarsat)
SES – Standard Earth Station
SET – European Telecommunications Working Group of the CEPT
SG – Secretary General
SGDF – Supergroup Distribution Frame
SHA – Sideral Hour Angle
SHF – Super High Frequency
SHE – Spacecraft Handling Equipment
SHF – Super High Frequency 3,000 – 30,000 MHz
SI – Speech Interpolation
SIMP – Satellite Interface Message Processor
SITA – Societe International des Telecommunications Aeronautiques (International Society of Aeronautical Telecommunications)
SIV – Solar and Interplanetary Variability
SLL – Satellite Line Link
SLS – Side Lobe Suppression
SMA – Semi-Major Access
SMATV – Satellite Master Antenna Television
SMY – Solar Maximum Year
S/N – Signal-to-Noise Ratio
SNA – System Network Architecture
SNG – Satellite News Gathering
SNF – System Noise Figure
SNIAS – Societe Nationale Aerospatiale
SNR – Signal-to-Noise Ratio
SNT – System Noise Temperature
SOC – Satellite Operation Complex
SOCC – Satellite Operations Control Center
SOM – Start of Message
SOM – Space Oblique Mercator
SPACEWARN – World Warning Agency for Rockets and Satellites (UN)
SPADE – SCPC PCM Multiple Access Demand Assigned Equipment
SPARRSO – Space Research and Remote Sensing Organization (Bangladesh)
SPC – Stored Program Control
SPDT – Single Pole Double Throw
SPELDA – Structure Porteuse Extreme Lancement Double Ariane (allows 2 payloads)
SPI – Special Position Identification (Pulse)
SPL – Sound Pressure Level
SPM – Signal Processing Modem
SRARQ – Selective Repeat-Automatic Repeat Request
SRB – Solid Rocket Booster
SRE – Speech Recognition Equipment (or VRE)
SRF – Service Request Flag
SRP – Signal Reference Point
SRTS – Supporting RTE/TSM System
SS – Satellite Switching
SS – Speed Spectrum
SSC – Satellite Switching Center
SS-TDMA – Satellite-Switched Time Division Multiple Access
SSB-SC-AM – Single Sideband Suppressed Carrier Amplitude
SSB-SC-ASK – Single Sideband Suppressed Carrier Amplitude Shift Keyed
SSB-SC-PAM – Single Sideband Suppressed Carrier Pulse Amplitude Modulation
SSC – Satellite Situation Center
SSFC – Sequential Single Frequency Code
SSLO – Solid State Local Oscillator
SSM – Satellite System Monitor
SSP – Signaling and Switching Processor
SSPA – Solid State Power Amplifier
SSRA – Spread Spectrum Random Access
SSSF – Self-Scanner Stop Failure
SS-TDMA – Satellite-Switched TDMA
SST – Satellite-to-Satellite Tracking
SSTM – Station-to-Station Traffic Matrix
SSU – Stratospheric Sounding Unit
SSU – Sequential Shunt Unit
SSU – Secondary Sampling Unit
SSUS – Solid Spinning Upper Stage
ST – “End Pulsing” Command (CCITT format)
ST – Standard Time
STA – Structural Test Article
STAR – Satellite Telecommunications with Automatic Routing (Simple form of SPADE system)
STBY – Standby
STCC – Spacecraft Technical Control Center
STDN – Space Tracking and Data Network
STE – Supergroup Translating Equipment
STE – Spacecraft Test Equipment
STELLA – Satellite Transmission Experiment Linking Laboratories (CNES)
STETS – Solar Terrestrial Energy Transfer Studies
STM – Structural Therman Model
STP – Space Test Program (USAF)
STR – Symbol Timing Recovery
STRIP – Satellite Transmission impairment Program
STS – Space Transportation System (operated by NASA – USA)
STSK – Scandinavian Committee for Satellite Telecommunications
SURVSATCOM – Survivable Communications Satellite
SVC – Secure Voice Communications Service
SW – Switch
SWIFT – Society for Worldwide Interband Financial Telecommunicaiton
SWOF – Switchover Operation Failure
SWR – Standing Wave Radio
SYLDA – System de Lancement Double Ariane (allows 2 payloads)
SYN – Synthesizer

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T

T – Tera (1,000,000,000)
T CARRIER – A hierarchy of Bell digital systems (T1, T2, etc.)
TH – Telemetry
T/R – Transmit/Receiver
T/V – Thermal Vacuum
TA – Transistor Amplifier
TASI – Time Assignment Speech Interpolation
TASO – Television Allocations Study
TAT – Transatlantic Telephone (USA/Europe) Cable
TB – Trunk Buffer
TBBF – Top Baseband Frequency
TBU – Transmit Baseband Unit
TC – Trunk Circuit
TC – Telecommand
TCC – Telephone Coordinating Circuit
TCD – Department of Technical Cooperation for Development (UN)
TC AND R – Telemetry Command and Ranging
TCE – Telemetry and Command Equipment
TCS – Thermal Control Subsystem
TCM – Trajectory Correction Maneuvers
TCXO – Temperature-Compensated Crystal Oscillator
TDA – Terminal Diode Amplifier
TDB – Traffic Data Base
TDF – Telediffusion de France
TDG – Transmit Data Gate
TDM – Time Division Multiplex
TDMA – Time Division Multiple Access
TDRSS – Tracking and Data Relay Satellite System
TE – Threshold Extension
TED – Threshold Extension Demodulator
TEL – Telephone
TEM – Traverse Electromagnetic
TERA – A trillion
TERM – Termination
TES – Transportable Earth Station
TETTO – Toroidal Beam Telemetry Antenna
TFC – Traffic
TFT – Thin Film Transistor
TFU – Timing and Frequency Unit
TG – Telegraph
TGF – Through Group Filter
TIROS – Meteorological Satellite (USA)
TIRS – Thermal Infrared Scanner
TIU – Terrestrial Interface Unit
TIUPIL – Typical Information Use Per Individual
TLP — Transmission Level Point
TM – Telemetry
TNIP – Terrestrial Network Interface Processor
TOC – Television Operating Center
TOCC – Technical and Operational Control Center
TOIRS – Transfer Orbit Infrared Earth Sensor
TOPS – Telemetry Operations
TOS – Transfer Orbit Stage
TOSSA – Transfer Orbit Sun Sensor Assembly
TOT – Time of Transmission
TP – Test to Point
TPD – Time Pulse Delay
TP – Transmission Point Level
TPP – Telecommunications Preparatory Programme
TPS – Therman Protection System
TPT – Transmission Path Translator
TRAD – Directional Telemetry Antenna
TRANSIT – Navy Navigational Satellite (USA)
TRM – Transmit-Receive Module
TRMA – Time Random Multiple Access
TRMS – TDMA Reference and Monitor Station Services
TRU – Transponder Right of Use
TS – Telegraph Service Circuit (CCITT)
TSC – Technical Services Contractor
TSESC – Telegraph Engineering Service Circuit
TSF – Through Supergroup Filter
TSM – Telephony Signaling Module
TSP – Transmit Shift Pulse
TSS – Tethered Satellite System
TSU – Terminating Signal Unit
TT AND C – Tracking, Telemetry, and Command
TTB – Trunk Test Buffer
TTC AND M — Tracking, Telemetry, Command and Monitoring Station
TTL – Transistor – Transistor Logic
TTP – Trunk Test Panel
TTPB – Trunk Test Panel Buffer
TTS – TDMA Terminal Simulation
TV – Television (video and assigned audio)
TVC – Thrust Vector Control
TVEC – Total Vertical Electron Content
TVRO – TV Receive Only
TWT – Traveling Wave Tube
TWTA – Traveling Wave Tube Amplifier
TX – Transmit

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U

U – Unidirectional
U/C – Up-converter
UARTO – United Arab Republic Telecommunication Organization
UBK – Unblock
UDC – Universal Data Classification
UDTS – Universal Data Transfer Service
UER – Union Europeene Radiodiffusion (European Broadcasting Union)
UFB – Unfit for Broadcast
UHF – Ultra-High Frequency 300-3,000 MHz
UIT – Union Internacional de Telcommunicaiones (ITU)
UITP – International Union of Public Transport
UL OR U/L – Uplink
UNCTAD – Conference on Trade and Development (UN)
UNEP – Environment Programme (UN)
UNESCO – Educational, Scientific and Cultural Organization (UN)
UNICODEC – Universal Code/Decoder (TV Service)
UNIPEDE – International Union of Producers and Distribution of Electrical Energy
UPS – Uninterrupted Power Supply
URSI – International Union of Radio Science
USB – United S-Band
USISC – International Service Carriers (USA)
UTC – Universal Time Clock

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V

V – Volt
VA – Volt Ampere
VAN – Value Added Network
VAR – Variation (Magnetic)
VAS – Value Added Service (or VAN)
VAS II – VideoCipher II
VDC – Valve Coil Driver
VCO – Voltage Controlled Oscillator
VDA – Volume Discount Agreement
VDDA – Variable Destination Demand Assignment
VDU – Visual Data Unit
VELCOR – Velocity Correction
VF – Voice Frequency
VFO – Variable Frequency Oscillator
VFT – Voice Frequency Telegraph
VHF – Very High Frequency
VHRR – Very High Resolution Radiometer
VIEWDATA – Generic name for a home information system
VISSR – Visible-Infrared Spin Scan Radiometer
VITEAC – Video Transmission Engineering Advisory Committee (USA)
VITS – Verification International Test Signal
VLF – Very Low Frequency
VLR – Very Low Range
VLSL – Very Large Scale Integrations
VOW – Voice Order Wire
VOR – VLF Omnidirectional Radio Range
VOX – Intersyllabic Voice Activated Carrier
VPD – Variable Power Divider
VPF – Vertical Processing Facility (KSC)
VRE – Voice Recognition Equipment
VSB – Vestigial Sideband
VSDM – Variable Slope Delta Encoding
VSM – Vestigial Sideband Modulation
VSWR – Voltage Standing-Wave Ratio
VTF – Via Terrestrial Facilities
VTR – Video Tape Recording
VU – Volume Unit

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W

W – Watt
WAN – Wide area Network
W/G – Waveguide
WARC/MR – World Administrative Radio Conference on Maritime Mobile Telecommunications
WARC/ST – World Administrative Radio Conference on Space Telecommunications
WATS – Wide Area Telephone Service
WB – Wideband
WBD – Wide Band Data (Channel)
WBEAF – Wide Band Earth Station Antenna Feed
WBPA – Wideband Power Amplifier
WDC – World Data Center (Rockets and Satellites)
WF – Weighting Function
WG – Waveguide
WISI – World Index of Space Imagery
WMO – World Meteorological Organization (UN)
WMS – World Magnetic Survey
WT – Wireless Telegraphy
WWW – World Weather Watch

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X

X – Combined Services (CCITT)
X-BAND – Used loosely to refer to satellites operating in the 8/7 GHz range
XPD – Cross-polarization Discrimination
XPNDR – Transponder
X-POL – Cross-Polarized
XMIT – Transmit
XPI – Cross Polar Interference
XSSF – Scanner Sync Failure

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Z

ZT – Zone Time