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A/D :
Analog to Digital
A/TT :
Analog Tie Trunk (TIA-646-B)
A0 :
AM Carrier With no Modulation
A2LA :
American Association for Laboratory Accreditation
AAA :
Authentication, Authorization and Accounting
AAC :
Advanced Audio Coding
AACCH :
Auxiliary Analog Control Channel
AAL :
ATM Adaptation Layer
AAL(D) :
Analog PSTN Access Line (Analog PBX Interface, TIA-646-B)
AAL5-CU :
ATM Adaptation Layer 5 Composite User
AAMI :
American Association for Medical Instrumentation
AAO :
Army acquisition objective [Military]
AAR :
Automatic Alternate Routing
AAR :
Association of American Railroads [Military]
AAV :
Authentication Algorithm Version
ABCQ :
Associacão Brasileira de Contréle de Qualidade (Brazilian Association for Quality Control)
ABEP :
Accrediting Body Evaluation Program (NIST) - USA
ABNF :
Augmented Backus-Naur Form
ABNT :
Associação Brasileira de Normas Técnicas (Brazilian Association for Technical Standardization)
ABR :
Available Bit Rate
ABS :
Alternate Billing Services
ACA :
Adaptive Channel Allocation
ACAP :
Army cost analysis paper [Military]
ACAT :
acquisition category [Military]
ACBO :
Automatic Cross Band Operation
ACC :
Analog Control Channel
ACC :
American Certification Corporation
ACCC :
Asociación Colombiana de Control de Calidad (Colombian Association for Quality Control)
ACCH :
Associated Control Channel
ACD :
Automatic Call Distribution
ACE :
Automated Calibration Equipment
ACELP :
Adaptive CELP
ACF :
Access Control Field
ACF :
Authentication Control Function
ACF :
Access Coordination Function
ACF :
Advanced Communications Function
ACG :
Automatic Code Gapping
ACIL :
American Council of Independent Laboratories
ACIL :
Association of Independent Scientific, Engineering and Testing Firms
ACK :
Acknowledgment [Communications]
ACKS :
Acknowledgments [Communications]
ACL :
Advanced CMOS logic [Communications]
ACL :
area calibration laboratory [Military]
ACM :
Address Complete
ACO :
Alarm Cut Off
ACO :
Automatic Cut Off
ACOS :
IEC Advisory Committee on Safety
ACP :
Network Action Point
ACR :
Absolute Category Rating
ACR :
Anonymous Call Rejection
ACRC :
area TMDE calibration and repair center [Military]
ACRE :
Authorization and Call Routing Equipment
ACS :
Automatic Calibration System
ACS :
Automatic Calibration System
ACSB :
Amplitude Compounded Single Side Band
ACSB :
Amplitude Compounded Single Side Band
ACSE :
Association Control Service Element
ACTE :
Approvals Committee for Terminal Equipment
ACTS :
Advanced Communications Technology Satellite
AD-BES :
Administrative Back-End Services
ADA :
Americans with Disabilities Act
ADAAG :
ADA Accessibility Guidelines
ADC :
Analog to Digital Converter
ADCCP :
Advanced Data Communications Control Procedure
ADCR :
Alternate Destination Call Redirection
ADHAG :
Ad Hoc Authentication Group (TR-45.2)
ADL :
All Digital Loop
ADL :
Automatic Determination of Location
ADLC :
Asynchronous Data Link Control
ADLG :
Automatic Determination of Location and Guidance
ADLNB :
Association of Designated Laboratories and Notified Bodies (European)
ADM :
Add/Drop Multiplexer
ADM 3X :
Add-Drop Multiplex (DS3)
ADO :
Additional Call Offering
ADP :
Automated Data Processing
ADPCM :
Adaptive Differential Pulse Code Modulation
ADPE :
automatic data processing equipment [Military]
ADS :
Asynchronous Data
ADSI :
Analog Display Services Interface (Bellcore)
ADSL :
Asymmetrical Digital Subscriber Line
ADSL-R :
Asymmetric Digital Subscriber Loop (Remote)
ADSLF :
ADSL Forum
ADT :
Asynchronous Data Teleservice
ADTS :
Automated Digital Terminal Systems
AEA :
American Electronics Association
AEC :
Acoustic Echo Controller
AEC :
Asociación Española para la Calidad (Spanish Association for Quality)
AEC :
Atomic Energy Commission - USA
AECE :
Acoustic Echo Control Equipment
AENOR :
Asociación Española de Normalización y Certificación (Spanish Association for Certification and Standardization)
AF :
Audio Frequency
AF :
Air Force- USA
AFAQ :
Association Française pour l'Assurance de la Qualité (French Association for Quality Assurance)
AFB :
Air Force Base - USA
AFC :
Automatic Frequency Control
AFE :
Analog Front End
AFI :
Authority and Format Identifier
AFLC :
Air Force Logistics Command - USA
AFM :
Air Force Manual - USA
AFMETCAL :
Air Force Metrology and Calibration - USA
AFNOR :
Association Francaise de Normalisation (French Standardization)
AFNOR :
Association Francaise de Normalisation (French Standardization)
AFPS :
Automatic Facility Protection Switching
AFR :
Automatic Flexible Routing
AFR :
Air Force Regulation - USA
AFSK :
Audio-frequency shift keying [Communications]
AFTO :
Air Force Technical Order - USA
AG :
Access Grant
AGA :
American Gas Association
AGC :
Audiographics Conferencing
AGCH :
Access Grant Channel
AGMC :
Aerospace Guidance & Metrology Center - USA
AGNI :
Advisory Group for Network Issues
AHAG :
Ad Hoc Authentication Group (TR-45)
AHDL :
Analog Hardware Discriptive Language
AHES :
Ad Hoc Emergency Services (TR-45.2)
AHG :
Ad Hoc Group
AHMMG :
Ad Hoc Microcell/Microsystems Guidelines
AHPAI :
Ad Hoc PCS Air Interface Joint Group
AHSOG :
Ad Hoc on Self Organization Group
AHWG :
Ad Hoc Working Group
AI :
artificial intelligence
AI :
Air Interface
AI :
Answer Indicator (V.8)
AIAA :
American Institute of Aeronautics and Astronautics [Communications]
AIC :
Advanced Intra Coding
AIC :
Application Identification Code
AID :
Access Identifier
AIG :
Authentication Implementation Guide
AIIM :
Association for Information and Image Management
AIN :
Advanced Intelligent Network
AIOD :
Automatic Identified Outward Dialing
AIS :
Alarm Indication Signal
AIS-L :
Alarm Indication Signal - Line
AIS-P :
Alarm Indication Signal - Path
AIS-V :
Alarm Indication Signal - Virtual (Tributary)
AIU :
Analog Interface Unit
AIV :
Alternative Inter VLC
AK :
Acknowledgement
AL :
Answer List
AL-PDU :
Answer List - Protocol Data Unit
AL-SDU :
Answer List - Service Data Unit
AL1 :
H.223 Adaption Layer 1
ALC :
Automatic Level Control
ALCE :
Automatic Level Control Equipment
ALE :
Automatic Link Establishment Radios
ALI :
Automatic Location Identification
ALIT :
Automatic Line Insulation Test
ALMCD :
Active-Matrix Liquid Crystal Display
ALMP :
Alarm Pattern
ALT :
Automatic Link Transfer
ALU :
Arithmetic Logic Unit
AM :
Amplitude Modulation [Communications]
AMA :
Automatic Message Accounting
AMA :
Adaptive Motion Accuracy
AMA/CDR :
Automatic Message Accounting/Call Detail Recording
AMADN :
Automatic Message Accounting Data Network
AMADNS :
AMA Data Network System
AMC :
U.S. Army Materiel Command [Military]
AMD :
AMenDment
AMDF :
Army master data file [Military]
AMEDD :
U.S. Army Medical Department [Military]
AMI :
Alternate Mark Inversion
AMIM :
Army Modernization Information Memorandum [Military]
AML :
Automatic-modulation-limiting [Communications]
AMPS :
Advanced Mobile Phone Service
AMR :
Adaptive MultiRate
AMR-WB :
Adaptive Multi-Rate Wideband
AMSAA :
Army Materiel Systems Analysis Activity [Military]
AN :
Access Network
AN :
Advisory Note
ANAI :
Access Network Architecture and Interfaces
ANC :
Access Network Controller
ANE :
Access Network Element
ANF :
Additional Network Feature
ANI :
Automatic Number Identification
ANM :
ANswer Message, signaling packet that is returned to caller which indicates that the called party is connected
ANOVA :
Analysis of Variance Procedure
ANR :
Automatic Network Routing
ANS :
Answer Tone
ANSI :
American National Standards Institute [Communications]
ANSI :
American National Standards Institute [Military]
ANSam :
Answer Tone, amplitude modulated
ANT :
Access Network Transport (Q1/15)
AOC :
Advice of Charge
AOC :
Advice of Charge
AOC-D :
Advice Of Charge during a call
AOC-E :
Advice Of Charge at the End of a call
AOI :
Automated Optical Inspection
AP :
Advanced Prediction
AP :
Application Protocols
AP :
Action Point
AP-S :
Antennas and Propagation Society [Communications]
APA :
All Points Addressable
APC :
Angle-polished connectors [Communications]
APCM :
Analog PCM
APCO :
Associated Public Safety Communications Officers, Inc.
APD :
Avalanche photodiode [Communications]
APDU :
Application Protocol Data Unit
APE :
Application Protocols Entities
APEC :
Asian Pacific Economic Cooperation
API :
Automated Programming Interface
APIC :
APCO Project 25 Interface Committee
APLAC :
Asian Pacific Laboratory Accreditation Cooperation
APP :
Application Marker
APPC :
Advanced Program to Program Communications
APPN :
Advanced Peer-to-Peer Networking
APR :
Alarm Processing Remote
APS :
Asynchronous Protocol Specification
APS :
Automatic Protection Switching
APSL :
U.S. Army Primary Standards Laboratory [Military]
AQL :
Acceptable Quality Level
ARC :
Adaptive Reception Control
ARCH :
Access Response Channel
ARD :
Automatic Ring Down
ARDC :
U.S. Army Armament Research and Development Center [Military]
ARET :
Accelerated Reliability Enhancement testing
ARIB :
Association of Radio Industries and Businesses (accredited standards setting body in Japan)
ARLP :
Acoustic Reference Level Plan
ARM :
Application Resource Manager
ARNGUS :
Army National Guard of the U.S. [Military]
ARP :
Address Resolution Protocol
ARPA :
Advanced Research Projects Agency
ARQ :
Automatic Repeat Request
ARQ :
Automatic Repeat Query (automatic request)
ARRL :
American Radio Relay League [Communications]
ARSTAF :
Army staff [Military]
ART :
Telecommunications Regulatory Authority (France)
ARTEP :
Army Training and Evaluation Program [Military]
AS :
Administrative System
AS56 :
Accunet(r) Switched 56
ASA :
Assistant Secretary of the Army [Military]
ASARC :
Army Systems Acquisition Review Council [Military]
ASARDA :
Assistant Secretary of the Army for Research, Development, and Acquisition [Military]
ASB :
Application Specific Bits
ASC :
AIN Switch Capabilities
ASCCC :
Asociación Chilean de Control de Calidad (Chilean Association for Quality Control)
ASCII :
American Standard Code for Information Interchange
ASDL :
Asymmetrical Digital Subscriber Line
ASDS :
Accunet(r) Spectrum of Digital Services
ASE :
Application Service Element
ASF :
AT&T Standardized Facilities
ASI :
additional skill identifier [Military]
ASIC :
Application-Specific Integrated Circuit
ASID :
Access, Searching and Indexing of Directories
ASIOE :
associated support items of equipment [Military]
ASK :
Amplitude-shift keying [Communications]
ASL :
Active Speech Level
ASL :
authorized stockage list [Military]
ASM :
American Society for Metals (now ASM International)
ASME :
American Society of Mechanical Engineers
ASMO :
Arab Organization for Standardization and Metrology
ASMW :
Amt für Standardisierung Messwesen und Warenprüfung (Office for Standardization, Measurements, and Product Testing) - Germany
ASN :
Abstract Symbol Notation
ASN :
AT&T Switched Network
ASN.1 :
Abstract Syntax Notation One
ASO :
Arbitrary Slice Ordering
ASP :
ammunition supply point [Military]
ASQ :
American Society for Quality
ASQC :
American Society of Quality Control
ASR :
Automatic Speech Recognition
ASR :
Access Service Request
ASR :
Answer Seizure Ratio
ASSP :
Application-specific standard products [Communications]
ASTM :
American Society for Testing and Materials
ASVD :
Analog SVD
AT :
Asynchronous Terminal
AT :
Access Tandem
ATA :
Analog Terminal and Access Project
ATAAB :
Analog Technical Ad hoc Advisory Board
ATAc :
ATA's Conventional Technology WG
ATAe :
ATA's Enhanced Technology WG
ATBCB :
Architectural and Transportation Barriers Compliance Board
ATC :
Analog Traffic Channel
ATD :
Asynchrounous Time Division
ATE :
Automatic Test Equipment
ATE :
automatic (or automated) test equipment [Military]
ATF :
Administrative Task Force
ATG :
Automatic Test Generation
ATIS :
Alliance for Telecommunications Industry Solutions
ATM :
see Asynchronous Transfer Mode
ATM-Utopia :
Universal Test and Operations Physical Layer Interface for ATM
ATMF :
ATM Forum
ATMOVE :
Adaptive-Template Movement
ATO :
Analog Tandem Office (TIA-646-B)
ATPG :
Automatic Test Pattern Generator
ATS :
Abstract Test Suite
ATS :
Assigned Time Slot
ATSE :
Advanced Television Systems Committee [Communications]
ATSS :
Automatic Test Support Systems Program [Military]
ATST :
area TMDE support team [Military]
ATU-C :
ADSL Transceiver Unit-Central office end
ATU-R :
ADSL Transceiver Unit-Remote terminal end
ATV :
Advanced Television
AU :
Access Unit
AUI :
Attachment Unit Interface
AURS :
Automated Unit Reference Sheet [Military]
AUSTROLAB :
Austrian Organization of Accredited Testing Laboratories
AV :
AudioVisual
AVC :
Audio Visual Coding
AVC :
Audiovisual Conferencing
AVD :
Alternating Voice Data
AVI :
Interactive Audiovisual Services
AVIM :
aviation intermediate maintenance [Military]
AVIS :
Audio Visual Information Systems
AVMMS :
AudioVisual and MultiMedia Services
AVS :
American Vacuum Society
AVT :
Audio/Visual Transport
AVUM :
aviation unit maintenance [Military]
AWG :
American Wire Gauge
AWG :
Arbitrary Waveform Generator
AWGN :
Additive white Gaussian noise [Communications]
AWI :
Alert With Info [Communications]
Abnormal Failure :
An artificially induced failure of a component, usually as a result of "abnormals" testing for regulatory agency safety compliance. active filter
Absorption :
Due to impurities in the glass of an optical fiber, the resultant loss of light.
Active Filter :
An electronic filter combining resistors and capacitors with active circuit devices such as operational amplifiers. Normally active filters match ideal filters more so than passive filters do.
Adapter :
A device which is often known as a coupling or interconnect sleeve, that is designed to align and join fiber optic connectors.
Admittance (Y) :
The reciprocal of impedance. A complex quantity given by Y=G +iB where G is the conductance and B the susceptance.
AlGaAs :
Aluminum gallium arsenide [Communications]
Algorithm :
A set of rules consisting of a finite number of steps used for solving a problem.
Alias Frequency :
A false lower-frequency component that occurs in analog data that is sampled from data that is originally digitized at too low a frequency.
Aliasing :
In a sampled data system, the analog input must be sampled at a rate of at least twice the bandwidth of the signal in order to avoid loss of data (Nyquist Theorem). Adhering to the Nyquist Theorem prevents in-band "alias" signals, which are beat frequenc
Ambient Level :
The values of signals and noise that exist at a test location when the device under test is not active.
Ambient Noise Level :
The level of acoustic noise existing at a given location, such as in a room, in a compartment, or at a place out of doors. Note 1
Amplitude Modulation (AM) :
Modulation in which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal.
Analog :
The transmittal of information which incorporates a continuous physical variable such as voltage amplitude or frequency variations.
Analog-to-Digital Conversion :
The process that changes an analog signal into a digital magnitude value.
Analog-to-Digital Converter (ADC) :
A device that converts an analog signal to a digital signal that represents equivalent information). Synonyms are analog-to-digital (A-D) coder, analog-to-digital (A-D) encoder.
Anechoic Chamber :
An enclosure especially designed with walls that absorb sound or radiation, creating an essentially free-field environment for testing.
Antenna :
A device used for radiating and receiving radio waves. It accomplishes this by changing electrical currents into electromagnetic radio waves and vice versa.
Antenna Array :
An arrangement of two or more antennas whose spacing and connections are such that they are in phase and their combined effects are additive.
Antenna Gain :
How much radiated and/or received power, in a given direction, increases when an antenna is in use as compared to the power radiated in the same direction by a standard omni-directional antenna.
Antenna Polarization :
The orientation of the radiated electric field in relation to the earth's surface.
Anti-Alias Filter :
A filter that attenuates noise and high-frequency components of an analog signal prior to its conversion into a digital value.
Area Analysis :
An technique of image-analysis used to find the area in an image that falls within a specific area of gray levels.
Array :
1. An arrangement of elements in one or more dimensions. 2. In a programming language, an aggregate that consists of data objects with identical attributes, each of which may be uniquely referenced by subscription.
Aspect Ratio :
In facsimile or television, the ratio of the width to the height of a picture, document, or scanning field.
Assembler :
A computer program that is used to assemble. Synonym assembly program.
Asynchronous :
Any type of action or event which takes place at an arbitrary time, irregardless of any coincidence with a reference timer or clock.
Asynchronous Transfer Mode (ATM) :
A high-speed multiplexing and switching method utilizing fixed-length cells of 53 octets to support multiple types of traffic. Note
Attenuation :
The decrease in intensity of a signal, beam, or wave as a result of absorption of energy and of scattering out of the path to the detector, but not including the reduction due to geometric spreading.
Attenuation Coefficient :
The rate of optical power loss relative to the distance along the fiber.
Auto Frequency Control :
(AFC) (As regards antennas) A circuit that gives a receiver the capability to "lock on" to a transmitter's signal, and thereby allows it to follow any deviations that happen to occur in the transmitter's frequency.
Autopolarity :
The ability of an instrument to measure and display an input of either polarity without switching the input leads.
Autoranging :
The ability of an instrument to switch among ranges automatically. The ranges are usually in decade steps.
Autoranging Time :
For instruments with autoranging capability, the time interval between application of a step input signal and its display, including the time for determining and changing to the correct range.
Auxiliary Power Unit :
(APU) A machine or device, the purpose of, to supply power, normally electrical, when their is an interruption or failure of the main source.
Avalanche Breakdown :
A breakdown that is caused by the cumulative multiplication of charge carriers through field-induced impact ionization.
Averaging :
In mathematics, distributing the results of various measurements by adding the number of measurements and then dividing by said result.
ac :
alternating current
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