DICTIONARY

Acronyms and Abbreviations

(OR)
Off Route. According to the provisions 1.34 and 1.37 of Radio Regulations, (OR) means an aeronautical mobile service or aeronautical mobile-satellite service intended for communications, including those relating to flight coordination, primarily outside national or international civil air routes.
(R)
Route. According to provisions 1.33 and 1.36 of the Radio Regulations (R) means an aeronautical mobile service or aeronautical mobile-satellite service reserved for communications relating to safety and regularity of flight, primarily along national or international civil air routes.
A/D
Analog-to-Digital
AARS
Automated Aircraft Reporting System
AAS
(1) Adaptive Antenna System
(2) Advanced Antenna System
Ac-nodeB
Aircraft Node B - radio interface onboard
ACARS
Aircraft Communications Addressing and Reporting System
ACC
Area Control Centre
ACC/L
Area Control Centre/Lower
ACC/U
Area Control Centre/Upper
ACK
Acknowledge
ACP
Aeronautical Communication Panel
ADC
Analog-to-Digital Converter
ADEOS
Advanced Earth Observation Satellite
ADP
Automatic Data Processing
ADPE
Automatic Data Processing Equipment
ADR
Astra Digital Radio
ADS
Automatic Dependant Surveillance (Aeronautical)
ADS-B
Automatic Dependent Surveillance-Broadcast (ADS-B): Aircraft transmitters operating within aeronautical mobile-satellite (R) service. Transmission of aircraft identification and position. (Note: Resolution 425 (WRC-15)).
AES
Aircraft Earth Station
AFA
Adaptive Frequency Agility
AFC
Automatic Frequency Control
AFOS
Automatic Forecasting and Observing System
AGA
Air Ground Air
AGC
Automatic Gain Control
AIC
Air Information Circullars
AIS
Automatic Identification System
AIS-SART
Automatic Identification System - Search And Rescue Transmitter
AL
Aeronautical Radionavigation Land Station
ALC
Automatic Level Control
ALD
Assistive Listening Devices
ALMA
Atacama Large Millimetre/Submillimetre Array
ALS
Airborne Landing System/Aircraft Landing System
AM
(1) Aeronautical Radionavigation Mobile Station
(2) Amplitude Modulation
AM(R)S
Aeronautical Mobile (R) Service
AMC
Asymmetrical Modulation and Coding Scheme
AMDAR
Aircraft Meteorological Data Relay
AMS
Aeronautical Mobile Service
AMS(OR)S
Aeronautical Mobile - Satellite (Off-Route) Service
AMS(R)S
Aeronautical Mobile - Satellite (Route) Service
AMSS
Aeronautical Mobile Satellite Service
AMT
Aeronautical Mobile Telemetry
ANSI
American National Standards Institute
ANSP
Air Navigation Service Provider
AOC
1) Aerodome Obstacle Chart
2) Aeronautical Operational Control
AOM
Acoustic beacons for orientation (Czech abbreviation)
API
Advance Publication Information
APP, App.
APP = Appendix of the ITU Radio Regulations, App. = Approach Control
APT
Asia-Pacific Telecommunity
APV
Approach and Landing Operations with Vertical Guidance
ARDF
Amateur Radio Direction Finding
ARNS
Aeronautical Radionavigation Service
ARNSS
Aeronautical Radionavigation-Satellite Service
ARPU
Average Revenue Per User
ARS
Amateur Service
ARSS
Amateur-Satellite Service
AS
Amateur-Satellite Service
ASA/LSA
See LSA/ASA
ASCII
American Standard Code for Information Interchange
ASDE
Airport Surface Detection Equipment
ASFCG
Aeronautical Spectrum Frequency Consultation Group
ASMI
Airfield Surface Movement Indicator
ASS
Amateur-Satellite Service
ATC
Air Trafic Control
ATIS
(1) Automatic Terminal Information Service
(2) Automatic Transmitter Identification System
ATM
(1) Air Traffic Management
(2) Asynchronous Transfer Mode
AtoN
Aid to Navigation [Rec. ITU-R M.1371-3]
ATPC
Automatic Transmitter Power Control
ATS
Air Traffic Services
ATSC
Advanced Television Systems Committee
ATU
African Telecommunicatios Union
AVI
Automatic Vehicle Identification [ECA]
AWR
Airborne Weather Radar
B-RNAV
Basic Area Navigation
BAS
Broadcasting Auxiliary Service
BBDR
Broad Band Disaster Relief
BC
Broadcasting station, sound
BEM
Block Edge Mask [ECC Rep 131]
BFWA
Broadband Fixed Wireless Access [ECA]
BLOS
Beyond Line-Of-Sight
BMA
Building Material Analysis
BPL
Broadband over Powerline
BPS, bit/s
Bits per Second
BPSK
Binary Phase-Shift Keying
BR
Bureau des radiocommunications UIT-R
BS
(1) Broadcasting Service
(2) Base Station
BSS
Broadcasting-Satellite Service
BT
Broadcasting station, television
BTS
Base Transceiver Station
BWA
Broadband Wireless Access
C/C
Command and Control
C2
Command and Control
CAP
Common Alerting Protocol
CB
Citizen Band (27 MHz)
CBISS
Communication Committee Broadcasting Issues Subgroup
CCA
Clear channel assessment. CCA is a mechanism in which multiple technologies using unlicensed spectrum can coexist. It includes Carrier sensing and energy detection. In Carrier sensing, you measure received signal strength of valid 802.11 symbol. The thresholds for both carrier sense and energy detection are predefined in the standard. For 802.11a the carrier sensitivity is ­82 dBm and the energy detection threshold is ­62 dBm. If no signal is sensed based on ED threshold, then go ahead with a transmission right away.
CCIR
International Radio Consultative Committee (ITU); french: Comité consultatif international pour la radio. In 1992, the CCIR became the ITU-R.
CCITT
International Telegraph and Telephone Consultative Committee (ITU). Renamed ITU-T in 1993.
CDMA
Code Division Multiple Access
CEPT
European Conference of Postal and Telecommunications Administration
CERP
Comitée Européen de Réglementation Postale
CGC, CGCs
Complementary Ground Components
CHB
Channel Bandwith
CHS
Channel Spacing
CIRAF
International High Frequency Broadcasting Conference
CIRM
International Maritime Radio Association
CISPR
Special International Committee on Radio Interference
CITEL
Conferencia Interamericana des Telecomunicaciones
CNS/ATM
Communication, Navigation, Surveillance/Air Trafic Managment
COCOM
Electronic Communication Comittee
CPC
Cognitive Pilot Channel
CPG
Conference Preparatory Group
CPM
Conference Preparatory Meeting
CRAF
Committee on Radio Astronomy Frequencies, www.craf.eu.
CRS
1) Central Radio Station
2) Cognitive Radio System
CS
(1) Central Station
(2) Carrier Sense
(3) Control Station
CSAT
Carrier Sensing Adaptive Transmission
CSTDMA
Carrier Sense Time Division Multiple Access
CT
Cordless Telephone
ČTÚ
Czech Telecommunication Office
CUS
Collective Use of Spectrum
CV
ITU Convention
CW
Continuous Wave
D-GPS
Differential Global Positioning System
D/A
Digital-to-Analog
DA2GC
Direct-Air-to-Ground Communications
DAA
Detect And Avoid
DAB
Digital Audio Broadcasting
DAB-IP
Digital Audio Broadcasting - Internet Protocol
DB
Direct Broadcast (dB = decibel)
DCS
Digital Communication System
DEC
Decision
DECT
Digital Enhanced Cordless Telecommunication
DFS
Dynamic Frequency Selection
DGNSS
Differential Global Navigation Satellite System
DGPS
See D-GPS
DHM
Digital voice beacons (Czech abbreviation)
DL
Downlink
DLR
Deutsche Zentrum fur Lüft- und Raumfahrt
DLS
Data Link Service
DMB
Digital Multimedia Broadcasting
DME
Distance Measuring Equipment
DMO
Direct Mode Operation
DRM
Digital Radio Mondial
DS-CDMA
Direct Spread Code Division Multiple Access
DSB
Double Side Band
DSC
Digital Selective Calling
DSI
Detailed Spectrum Investigation
DSL
Digital Subscriber Line
DSO
Digital Switchover
DSR
Digital Satellite Radio
DSRC
Dedicated Short-Range Communication
DSSS
Direct Sequence Spread Spectrum
DTE
Data Terminal Equipment
DTH
Direct-to-Home
DTT
Digital Terrestrial Television
DVB-H
Digital Video Broadcasting-Handheld
DVB-SH
Digital Video Broadcasting Satellite services to Handheld devices (SH) below 3 GHz [ETSI BROADCAS TS 102 585 V1.1.1]
DVB-T
Digital Video Broadcasting-Terrestrial
E-GSM
Extended-GSM
E/s
Earth-to-space direction
EACP
European Aeronautical Common Position
EAS
Electronic Article Surveillance
EBU
European Brodcasting Union
EC
European Commission
ECA
European Common Allocation Table. See http://www.erodocdb.dk/docs/doc98/official/pdf/ERCRep025.pdf
ECC
Electronic Communications Committee of the CEPT
eCCA
extended Clear Channel Assessment. If a channel is busy (see CCA), then wait for it to become clear. Once it is clear, wait for a random number of additional CCAs indicating that the channel has remained clear before starting transmission.
ECP
European Common Proposal
ECS
Electronic Communications Services
ECTRA
European Committee for Regulatory Telecommunications Affairs
EES
Earth Exploration Satellite
EESS
Earth Exploration-Satellite Service
EFIS
ECO (European) Frequency Information System
EFP
Electronic Field Production
EFTA
European Free Trade Association
EGNOS
European Geostationary Navigation Overlay Service
EHF
Extra High Frequency
EHRI
Extremely High Resolution Imagery
EIRP
Equivalent Isotropically Radiated Power
ELBA
Emergency Location Beacon-Aircraft
ELT
Emergency Locator Transmitter
EMC
Electromagnetic Compatability
EMI
Electromagnetic Interference
ENG/OB
Electronic News Gathering/Outside Broadcasting
ENVISAT
Environmental Satellite
EOS
Earth Observation Satellites
EPFD
Equivalent Power Flux Density
EPG
Electronic Programme Guide
EPIRB
Emergency Position Indicating Radio Beacon
ERC
European Radiocommunications Committee
ERMES
European Radio Messaging System
ERMTS
European Rail Traffic Management System
ERO
European Radiocommunications Office
ERP
Efective Radiated Power
ESA
European Space Agency
ESOMP
The Earth Stations On Mobile Platforms.
ESV
Earth Stations on-board Vessels
ETO
European Telecommunications Office
ETSI
European Telecommunications Standard Institute
EU
(1) European Union
(2) EUropean footnote
EUMETSAT
European Organization for the Exploitation of Meteorological Satellites
EUROCAE
European Organization for Civil Aviation Equipment
EUTELSAT
European Telecommunications Satellite Organisation
EVA
Extra Vehicular Activity
FA
Aeronautical station
FATDMA
Fixed Access Time Division Multiple Access
FB
Base station
FC
Coast station
FCC
Federal Communications Commission
FD
Aeronautical Station in the Aeronautical Mobile (R) Service
FDD
Frequency Division Duplex
FDM
Frequency Division Multiplexing
FEC
Forward Error Correction
FG
Aeronautical station in the aeronautical mobile (OR) service
FHSS
Frequency Hopping Spread Spectrum
FIC
Fast Information Channel
FIFO
First-in, first-out
FL
Land station
FM
Frequency Modulation
FP
Port station
FPLMTS
Future Public Land Mobile Telecommunications System
FS
Fixed Service
FSO
Free Space Optical Communications
FSS
Fixed-Satellite Service
FTP
File Transfer Protocol
FWA
Fixed Wireless Access
FWS
Fixed Wireless System
FX
Fixed station
GBAS
Ground Based Augmentation System
GBSAR
Ground Based Synthetic Aperture Radar
GEO
Geostationary Earth Orbit
GLONASS
Global Orbiting Navigation Satellite System
GMDSS
Global Maritime Distress and Safety System
GMS
Geostationary Meteorological Satellite
GMSK
Gaussian Minimum-Shift Keying
GMT
Greenwich Mean Time
GNSS
Global Navigation Satellite System
GOC
General Operator's Certificate
GOES
Geostationary Operational Environmental Satellite
GOMS
Geostationary Operational Meteorological Satellite
GP
Glide Path
GPR
Ground-Probing Radar
GPRS
General Packet Radio Service
GPS
Global Positioning System
GSM
Global System for Mobile Communications
GSM-R
GSM-Railway
GSMA
GSM Association
GSMOBV
GSM on Board Vessels
GSO
Geostationary Satellite Orbit
HAPS
High Altitude Platform Station
HbbTV
Hybrid Broadcast Broadband TV
HCM
HCM Agreement – Agreement between the Administrations of Austria, Belgium, the Czech Republic, Germany, France, Hungary, the Netherlands, Croatia, Italy, Liechtenstein, Lithuania, Luxembourg, Poland, Romania, the Slovak Republic, Slovenia and Switzerland on the co-ordination of frequencies between 29.7 MHz and 43,5 GHz for the fixed service and the land mobile service.
HDFS
High Density Fixed Service
HDFSS
High Density Fixed Satellite Service
HDTV
High Definition TV
HEO
Highly Eliptical Orbit
HEST
High e.i.r.p. Satellite Terminals
HF
High Frequency
HFBC
High Frequency BroadCasting
HFCC
High Frequency Coordination Conference
HIO
Highly Inclined Orbits
HIPERLAN
High Performance Radio Local Area Networks
HRS
Trunk networks
HS
Handportable Station
HSDPA
High-Speed Downlink Packet Access
HSPA
High Speed Packet Access
HSUPA
High-Speed Uplink Packet Access
Htx
Transmitter Height
IALA
International Association of Lighthouse Authorities
IARU
International Amateur Radio Union
IATA
International Air Transport Association
ICAO
International Civil Aviation Organisation
ICT
Information and Communication Technologies
IDWM
ITU Digitized World Map
IEC
International Electrotechnical Commission
IEEE
Institute of Electrical and Electronics Engineers
IFF
Identification Friend or Foe
IFIC
International Frequency Information Circular
IFL
International Frequency List
IHO
International Hydrographic Organization
ILS
Instrument Landing System
ILS-GP
Instrument Landing System – Glide Path
IMO
International Maritime Organisation
IMSO
International Mobile Satellite Organisation
IMT
International Mobile Telecommunications. See ITU Res. 56-1. IMT encompasses IMT-2000, IMT-Advanced and IMT-2020.
IMT-2000
International Mobile Telecommunications-2000
IMT-2020
5th generation of IMT. The term “IMT-2020” is applied to those systems, system components and related aspects that include new radio interface(s) which support the new capabilities of systems beyond IMT-2000 and IMT-Advanced (ITU Res. 56-2).
IMT-Advanced
International Mobile Telecommunications-Advanced
INMARSAT
International Maritime Satellite Organisation
INTELSAT
International Telecommunication Satellite Organisation
Intersputnik
International Organisation of Space Communication
IoT
Internet of Things.
IP
Internet Protocol
IPR
Intellectual Property Rights
IRT-2000
Integrated Rural Telephony
ISM
Industrial, Scientific and Medical Applications
ISO
International Organization for Standardization
ISP
Internet Service Provider
ISS
(1) Inter-Satellite Service
(2) International Space Station
ITS
Intelligent Transport Systems
ITSO
International Telecommunication Satellite Organisation
ITU
International Telecommunication Union
ITU-D
International Telecommunication Union - Development
ITU-R
International Telecommunication Union - Radiocommunication
ITU-T
International Telecommunication Union - Telecommunication
JTG
Joint Task Group
JTIDS
Joint Tactical Information and Distribution System
KBPS, kbit/s
Kilobits per Second
Klíčovací poměr
A duty cycle is the percentage of one period in which a signal or system is active.
KSC
Kennedy Space Center
LAN
Local Area Network
LBT
Listen Before Talk
LDC
Low Duty Cycle
LEO
Low Earth Orbit
LEOP
Launch and Early Operations Phase
LEST
Low E.i.r.p. Satellite Terminals
LF
Low Frequency
LIDAR
Light Detection and Ranging
LLZ
Localizer
LMS
Land Mobile Service
LMSS
Land Mobile-Satellite Service
LOS
Line of Sight
LP-AMI
Low Power-Active Medical Implant
LPD
Low Power Device
LPR
Level Probing Radar
LR
Radiolocation Land Station
LRIT
Long-Range Identification and Tracking
LSA/ASA
Licensed/Authorised Shared Access
LSDI
Large Screen Digital Imagery
LT2
Location Tracking Applications Type 2
LTE
Long Term Evolution of the 3GPP radio technology
LTE-A
LTE Advanced
M2M
Machine-to-Machine. Non-personal communication, part of the Internet of Things (IoT).
MA
Aircraft Station
MARS
Maritime Mobile Access and Retrieval System
MB/s
Megabytes per second
MBANS
Medical Body Area Network Systems
Mbit/s
Megabits per second
MCA
Mobile Communication on board Aircraft
MCV
Mobile Communication on board Vessel
MediaFLO
Terrestrial Mobile Multimedia Multicast-Forward Link Only
MEO
Medium Earth Orbit
MES
Mobile Earth Station
MetAids
Meteorological Aids Service
MetSat
Meteorological-Satellite Service
MF
Medium Frequency
MFN
Multi Frequency Network
MHP
Multimedia Home Platform
MID
Maritime Identification Digits
MIDS
Multifunctional Information Distribution System
MIFR
Master International Frequency Register
ML
Land mobile station
Mobile Link (Mobile station transmits)
MLM
Multilateral Meeting
MLS
Microwave Landing System
MMDS
Microwave Multipoint Distribution System
MMS
Maritime Mobile Service
MMSI
Maritime Mobile Service Identity
MMSS
Maritime Mobile-Satellite Service
MO
Mobile station
MOB
Man over Board
MoU
Memorandum of Understanding
MP
Point-to-Multipoint
MPEG
Moving Pictures Experts Group
MPR
Multipurpose Radar
MR
Radiolocation Mobile Station
MRNS
Maritime Radionavigation Service
MRNSS
Maritime Radionavigation-Satellite Service
MRVA
Minimum Radar Vectoring Altitude
MS
1) Mobile Service
2) Member States
3) Ship station
MSA
Minimum Sector Altitude
MSI
Maritime Safety Information
MSK
Minimum-shift keing
MSS
1) Mobile Satellite Service
2) Mobile Satellite Services
MUF
Maximum Usable Frequency
MVDS
Multipoint Video Distribution Service
MWA
Mobile Wireless Access
MWARA
Major World Air Route Area
MWS
Multimedia Wireless System
NASA
National Aeronautics and Space Administration
NATO
North Atlantic Treaty Organisation
NAVTEX
1) Navigational Text Messages
2) Narrow-band direct-printing telegraphy system for transmission of navigational and meteorological warnings and urgent information to ships
NBDP
Narrow Band Direct Printing
NCU
Network Control Unit
NDB
Non-Directional Radio Beacon
NF
Noise Figure
NFC
Near Field Communication
NGMN
Next Generation Mobile Networks
NJFA
NATO Joint Civil/Military Frequency Agreement
NL
Maritime radionavigation land station
NLOS
Non Line of Sight
NMT
Nordic Mobile Telephone
NOAA
1) National Oceanic and Atmospheric Administration
2) Polar METSAT
Non-GSO
Non Geostationary Orbit
NR
Radionavigation mobile station
NTFA
National Table of Frequency Allocations
NTSC
National Television Systems Committee
NVIS
Near Vertical Incidence Skywave
NWA
Nomadic Wireless Access
NWP
Numerical Weather Prediction
OB
Outside Broadcasting
OBU
On-Board Unit
OD
Oceanographic Data Station
ODC
Object Discrimination and Characterization
OE
Oceanographic data interrogation station
OFDM
Orthogonal Frequency Division Multiplexing
OFDMA
Orthogonal Frequency Division Multiple Access
OIRT
The International Radio and Television Organisation
OOB
Out-of-Band
ORM
Operator Review Meetings
OW
Optical Wireless
P-MP
Point-to-Multipoint
P-P
1) Point-to-Point
2) Peak-to-Peak
P-RNAV
Precision Area Navigation
PAD
Programme Associated Data
PAL
Phase Alternate Line (Colour TV standard)
PAMR
Public Access Mobile Radio
PAR
Precision Approach Radar
PCM
Pulse Code Modulation
PCN
Personal Communication Network
PDA
PreDetermined Arc
pfd, PFD
Power Flux Density
PLB
Personal Locator Beacon
PLC
Powerline Communications
PM
Phase Modulation
PMR
Professional Mobile Radio/Private Mobile Radio
PMSE
Programme Making and Special Events services
PP
Plenipotentiary Conference
PPDR
Public Protection and Disaster Relief
PSK
Phase Shift Keying
PSR
Primary Surveillance Radar
PT
Project Team
PWAP
Private Wide Area Paging
PWMS
Professional Wireless Microphone Systems
QAM
Quadrature Amplitude Modulation
QoS
Quality of Service
QPSK
Quadrature Phase Shift Keying
R&TTE
Radio&Telecommunications Terminal Equipment
RA
(1) Radiocommunication Assembly
(2) Radio Astronomy
(3) Radar Altimeter
Racon
Radio Beacon
RAG
Radiocommunication Advisory Group
RAS
Radio Astronomy Service. See also CRAF.
RCC
Rescue Coordination Center
Regional Commonwealth in the Field of Communications
RDARA
Regional And Domestic Air Route Area
RDS
1) Radiodetermination Service
2) Radio Data Service nebo Radio Data System
RDSS
Radiodetermination-Satellite Service
REC, Rec.
Recommendation
Rep.
report
RES, Res.
Resolution
RF
Radio Frequency
RFID
Radio Frequency Identification Device
RIS
River Information System
RISC
Railway Interoperability and Safety Committee
RLAN
Radio Local Area Network
RLS
Radiolocation Service
RLSS
Radiolocation-Satellite Service
RM
Maritime radionavigation mobile station
RN
Radionavigation land station
RNAV
Area Navigation
RNS
RadioNavigation Service
RNSS
RadioNavigation Satellite Service
ROC
Restricted Operator's Certificate
ROES
Receive Only Earth Stations
RoP
Rules of Procedure
RPA
Remotely Piloted Aircraft
RPC
Remote Piloting Centre
rr/RR
RR = Radio Regulations
RRB
Radio Regulations Board
RSBN
Radiolocation System for Short Range Navigation
RSC
Radio Spectrum Committee
RSM
Radio Speed Meter
RSMS
Radar Sensing and Measurement System
RSP
Responder Beacon
RSPG
Radio Spectrum Policy Group
RSR
en-Route Surveillance Radar
RSSI
Received Signal Strength Indication
RSU
Road Side Unit
RTCA
Radio Technical Commission for Aeronautics
RTTT
Road Transport and Traffic Telematics
Rx
Receiver [Rec. ITU-R M.1371-3]
S-DAB
Satellite Digital Audio Broadcasting
S-PCS
Satellite Personal Communication System
s/E
Space-to-Earth direction
S/N
Signal-to-Noise ratio
SA
Meteorological aids mobile station
SAA, S&A
Sense and Avoid
SAB
Service Ancillary for Broadcasting
SAB/SAP
Service Ancillary for Broadcasting/Service Ancillary for Program
SAP
Service Ancillary for Program
SAR
1) Search and Rescue
2) Synthetic Aperture Radar
SARPs
Standards And Recommended Practices
SARSAT
Search and Rescue Satellite Aided Tracking (see COSPAS)
SART
Search and Rescue Transponder
SATCOM
Satellite Communications
SBAS
Satellite Based Augmentation System
SBR
Surface-Based Radar
SC
Special Committee on regulatory/procedural matters
SDR
1) Satellite Digital Radio
2) Software Defined Radio
SECAM
Séquentiel Couleur á Mémoire
SES
Single European Sky
SESAR
Single European Sky ATM Research Programme
SFCG
Space Frequency Coordination Group
SFN
Single Frequency Network
SG
Study Group
SG-RFC
Steering Group on Radio Frequency Coordination
SHF
Super High Frequency
SINR
Signal to Interference and Noise Ratio
SIT
Satellite Interactive Terminal
SM
Meteorological aids land station
SMOS
Soil Moisture and Ocean Salinity
SMR
Surface Movement Radar
SNG
Satellite News Gathering
SNR
Signal to Noise Ratio
SOL
Safety of Life
SOLAS
International Convention for the Safety of Life at Sea
SOS
Space Operation Service
SOTDMA
Self-Organized Time Division Multiple Access
SRD
Short Range Device
SRR
Automotive Short Range Radar
SRS
Space Research Service
SS
Standard frequency and time signal station
SSAS
Ship Security and Alerting Systems
SSB
Single Side Band
SSR
Secondary Surveillance Radar
STB
Set-top-box
SUT
Satellite User Terminal
T-DAB
Terrestrial-Digital Audio Broadcasting
T-DMB
Terrestrial Digital Multimedia Broadcasting
T&C
Telemetry and Command
TACAN
Tactical Aeronautical Navigation
TACS
Total Access Communication System
TAPS
TETRA Advanced Packed Data Service
TCAM
Telecommunication Conformity Assesment and Market Surveillance Committee
TDD
Time Division Duplex
TDM
Time Division Multiplexing
TDMA
Time Division Multiple Access
TEDS
TETRA Enhanced Data Services
TES
Transportable Earth Stations
TETRA
Terrestrial Trunked Radio
TFTS
Terrestrial Flight Telecommunication System
TG
Task Group. See also JTG
TIG
Time-invariant Gain
TLPR
Tank Level Probing Radar
TPC
Transmit Power Control
TRA-ECS
Terrestrial Radio Applications Capable of Providing Electronic Communications Services
TRR
Tactical Radio Relays
TS
Terminal Station
TSB
Telecommunication Standardization Bureau
TT&C
Telemetry, Tracking and Commands
TTT
Transport and traffic telematics
TV
Television
TVG
Time-Variant Gain
TVOB
Television Outside Broadcast
TVWS
TV White Spaces
TWIM
Terrestrial Wireless Interactive Multimedia
Tx
Transmitter
UA
Unmanned Aircraft
UAC
Urban Area Coverage
UACS
Unmanned Aircraft Control Station
UAS
Unmanned Aircraft Systems
UAT
Universal Access Transceiver
UAV
Unmanned Air Vehicle
UDF
Ultra High Frequency Direction-Finding Station
UHF
Ultra High Frequency
UIC
Iternational Railways Union
UL
Uplink
ULP-AID
Ultra Low Power Animal Implant Devices
ULP-AMI
Ultra Low Power Active Medical Implants
ULP-MMI
Ultra Low Power Medical Membrane Implants
UMTS
Universal Mobile Terrestrial System/Universal Mobile Telecommunications System
USB
Universal Serial Bus
UTRA
UMTS Terrestrial Radio Access
UWB
Ultra Wide Band
VDF
Very High Frequency Direction-Finding Station
VDL
VHF Data Link
VGE
Voluntary Group of Experts
VHF
Very High Frequency
VLBI
Very Long Baseline Interferometry
VLF
Very Low Frequency
VoIP
Voice over Internet Protocol
VOR
VHF Omnidirectional Radio Range
VORTAC
VOR and TACAN combination
VOX
Voice Activation Exchange
VR
Vehicle Radar
VSAT
Very Small Aperture Terminal
VTS
(1) Vessel traffic services
(2) Vessel Traffic System (radar)
WAIC
Wireless Avionic Intra-Aircraft Communications
WAPECS
Wireless Access Policy for Electronic Communications Services
WARC
World Administrative Radio Conference
WAS/RLAN
Wireless Access Systems/Radio Local Area Network
WCDMA
Wideband Code Division Multiple Access
WG
Working Group
WGFM
Working Group Frequency Management
WGS
World Geodetic System
WGSE
Working Group Spectrum Engineering. EPT group developing technical guidelines for the use of the frequency spectrum by various radiocommunication services, sharing criteria for the use of the same band, compatibility criteria for the use of different bands.
WiMax
Worldwide Interoperability for Microwave Access
WLAM
Wideband Low Activity Mode
WLAN
Wireless LAN
WLL
Wireless Local Loop
WMO
World Meteorological Organization
WP
Working Party
WPAN
Wireless Personal Area Network
WPR
Wall-Probing Radar
WRC
World Radiocommunication Conference
WRC-03
World Radiocommunication Conference 2003
WRC-07
World Radiocommunication Conference 2007
WRC-12
World Radiocommunication Conference 2012
WRC-2000
World Radiocommunication Conference 2000
WSD
White Space Devices
WSIS
World Summit on the Information Society
WTDC
World Telecommunication Development Conference; note: Telecommunication Development Sector (ITU-D)
WTO
World Trade Organisation
WTSA
World Telecommnication Standardization Assembly
WWW
1) World Wide Web
2) World Weather Watch
X-QAM
Quadrature Amplitude Modulation (X states)

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