A字彙

A band
A condition
A digit selector
A digit switch
A-B toll method
A-B toll operation
A-board dialling
A-key
A-law companding
A-operator
A-sandwich radome
A-scan
A-to-D conversion
A/D encoder
A/D，multiple threshold A/M(Ampere per Meter)
A/Z ratio

aadvective duct
AAL Parameters
aantenna radiation pattern measurement
AB toll
abandoned call
abbreviation
above ground antenna
ABR(Available Bit Rate)
abridged indication
abruption
ABS(American Bureau of Shtandards)
absentee
absorbability
absorption，hydrogen induced
ABT(ATM Block Transfer)
accentuate
accentuation
accentuator
accept the call
acceptable failure rate
accompanying sound trap
accoustic telegraphy
accumulation distribution unit accumulator
accumulator
acid gas
ack button
ACK(ACKnowledgement)
ACKnow ledgement (ACK)
acknowledge
acknowledged
acknowledgement，negative
ACM(Address Complete Message)
acquittance
ACR(Allowed Cell Rate)
across the line
acrylic acid
activate key
activation of homing
activity address code
actuation time
actuator
actutaing signal
ad hoc committee
adaptation level
adaptvie quantization(AQ)
Adcock array
addition theorem
addressed receiving station
addressee's credit
addressing
address，abnormal
adivsory route
adjectival band designation
adjunct circuit
adjuster
administrative network
ADPCM(Adaptive Differential Pulse Code Modulation)
advenction fog
advise duration and charge call
aeradio guide aerial
aero(aeronautical)
aerodiscone antenna
aerophare
aerophone
aeroplance station
aerospace(aeronautics and space)
affiliates
after payment type public telephone
aging failure
aided range gearing
aim point
airbome audio frequency coder
aircom system
airfield control communication
airframe effect
airwave
Airy function
AIS(Alarm Indication Signal)
alarming apparatus
albedowave
ALC (Automatic Level Control)
alert
ALERT(Alerting Message)
Alford hybrid
algebraic multiple-error correcting code
algebraically independent
algorithm
algorithm， forward-search
algorithm，Euclid's division
algorithm，forwardsearch
algorithm，least-squares(LS)
algorithm，MIT
aliasing
align
alignment，passive direct
alive circuit
allbusy circuit
allocated service
allocator
ALN(Alignment)
ALOHA
alphabet telegraph
alphageometric system
alphamosaic system
alphanumeric(character)
ALT(altitude)
alterroute
alumina
Aluminum Gallium Arsenide (AlGaAs)
ambient noise
ambiguity，phase
Amere's law
Ampere's circuit law
Ampere-Turns(AT)
ampere{=AMP}
amplifer，broad band
amplified phone
amplifiers，degenerate parametric
amplifier{=AMP}
amplifier，backward wave
amplifier，gain of
amplifier，high-impedance
amplifier，low noise
amplifier，modulated pulse
amplifier，monitoring
amplifier，photonic network
amplifier，power
amplifier，signal-to-noise ratio of
amplifier，TWT(Traveling Wave Tube)
analysis，periodogram
ancillary data
anechoic chamber
anenna waveguide section
anerture antennas， radiation equations of
angels
angle，critical
anisotropic dielectric
ANM(Answer Message)
announced retransmission random access protocol
announcer
annual frequency list
anomalous sound propagation in sea water
anomaly of the ionosphere
ANT(Antenna)
antenna，aperture of
antenna，circular hom
antenna，complementary
antenna，conical equiangular spiral
antenna，disk-capacitor
antenna，double reflector
antenna，effective apeture of
antenna，flat plate
antenna，FM transmitting
antenna，geodesic hens
antenna，helical broadand
antenna，low-frequency
antenna，mechanically despun
antenna，medium-frequency broadcast
antenna，microwave-relay
antenna，mode 2 contical spiral
antenna，modified Cassegrain
antenna，movable
antenna，multiple-beam torus
antenna，noresonant
antenna，open Cassegrain
antenna，panel
antenna，parabolic
antenna，parasitic
antenna，patch
antenna，pattern characteristics of
antenna，pencil-beam
antenna，Yagi Uda broadand
antiarmor missile
anticlutter receiver
antijamming{=AJ}
ANTILOG(Antilogarithm)
antinode
antipodal signals
antireflecitive coating
antisideband
antisidetone set
ANVSTAR (Navigation Star) NB (Narrow Band)
anwering circuit
anwswering cord
AP(Assoicated Press)
APD detector
APD(Avalanche Photo-Diode)
apertures coupling coefficients
aperture， Bayliss line source
apex
apiral waveguide
Appleton layer Application Process(AP)
applications
appointment call
approaching target
appropriate route
apread factor table
apreture illumination efficiency
AR process
Archer lens
Archimedian spiral antenna
architecture
area， muisance
Armed Service Electrostandard Agency{=ASESA}
armored cable
ARPA(Advanced Rescarch Projects Agency)
ARQ error control
arrangement of wires
arrester
ARTA(American Radio Telegraphists)
artery
AS(Amateur Station)
ASA(As Soon As Possible)
ascending node
ASCII code
Asian Broadcasting Union
aspect ratio
aspheric lens
assembly code
Assured Data Transfer
astatic microphone
astigmatic ray
astigmatism
asymptotic coding gain
AT&T(American Telephone and Telephone Company)
ATC
ATC(Adaptive Transform Transfer Capability)
atenna，non-directional
atmosphreic interference
ATSI (Time Assignment Speech Interpolation)
ATT(American Telephone and Telegraph Company)
attachment
attack center switchboard
attempted call
attended frontier station
attention display
attenuators
attribute
audibleness
auditory masking threshold
Auger recombination
auroral disturbance
authentication
authenticator
autocar radio installation
autocode
autocoder
autocovariance function
autodial
autodyne reception
autofax
autograph reception
autographic telegraph
autohead
autokeyer
automanual telephone switchboard
automatically tuned shortwave transmitter
autopilot
AutoRregressive(AR) process
AUTOSPEC telegraph equipment
autosync
autotracking
auxiliary{=AUX}
azimuthal error

Abbe number
Abbe sine condition

abbreviated address
abbreviated call
abbreviated call letters
abbreviated dial system
abbreviated dialling
abbreviated format
abbreviated indication
abbreviated name
abbreviated plain address

abnormal
abnormaL drop
abnormal E layer
abnormal return address

abort
abort light

absolute calibration
absolute code
absolute coding
absolute delay
absolute deviation
absolute efficiency
absolute permeability
absolute phase measurement
absolute power gain
absolute priority
absolute unit
absolute urgency

absorber
absorber circuit

absorbing circuit
absorbing material

absorption
absorption bands
absorption coefficient，photoconductors
absorption fading
absorption frequency
absorption limiting frequency
absorption loss
absorption region
absorption tube keying system

absorptivity
absorptivity wave-meter

abstract code
Abstract Syntax Notation One{=ASN.1}

AC coefficient
ac component of noise
AC interference
AC ringer
AC servo
AC signaling
AC signaling system
AC telegraph circuit
AC telegraph system

acceptance angle
acceptance angle，solid
acceptance cone
acceptance range
acceptance region

accepted limit
accepted to lerance
accepted upper limit

acceptor
acceptor impurity

access
access channel
access circuit
access cycle
Access Delivery Information
access number(network)
access point
access prefix
access speed
access switch
Access Transport
access unit
access-line facilities

accessory
accessory charge
accessory circuit
accessory equipment

acknowledgement bit
acknowledgement frame
acknowledgement indicator
acknowledgement lamp
acknowledgement of receipt
acknowledgement procedure
acknowledgement signal

acoustic frequency
acoustic frequency branch
acoustic frequency generator
acoustic image
acoustic signal
acoustic telegraph
acoustic vibration simulation

acoustical signal
acoustical signaling
acoustical speech power
acoustical telegraphy
acoustical telephony

acousto-optic devices
acousto-optic effect

acquisition
acquisition radar
acquisition range
acquisition time
acquisition tracking subsystem

active alignment
active antenna
active array
active array antennas
active balance return loss
active channel
active circuit
active communication satellite
active filter
active homing
active impedance
active line
active lines per frame
active mode-locking
Active Phase
active relay station
active relaying
active repeater satellite
active return loss
active satellite
active satellite attitude control
active scanning interval
active singing point
active star networks
active system
active transducer

actual addressee
actual antenna area
actual bandwidth
actual switching point
actual transmission

actuating error signal
actuating ratio
actuating section
actuating system

adapter
adapter-converter

adaptive antenna
adaptive array
adaptive array antennas
adaptive binary arithmetic decoding
adaptive binary arithmetic encoding
adaptive bit allocation
adaptive communication
adaptive control system
adaptive decoder
adaptive deconvolution
Adaptive Delta Modulation{=ADM}
Adaptive Differentail Pulse Code Modulation(ADPCM)
adaptive equalization
adaptive filter
adaptive interference canceling
adaptive lattice predictor
adaptive line enhancer
adaptive linear combiner
adaptive multichannel prediction
adaptive noise allocation
adaptive noise canceling
Adaptive PCM
adaptive postfiltering
adaptive prediction(AP)
adaptive predictive codikng(APC)
adaptive predictor
Adaptive Pulse Code Modulation(APCM)
adaptive recursive filter
adaptive routing
adaptive segmentation
adaptive system
adaptive transform coding(ATC)
adaptive vector quantization

Additional Calling Party Number
Additional Connected Number
additional cost
additional dissemination service
additional expense
additional load
additional radio regulation
additional service

additive
additive white Gaussian noise channel
Additive White Gaussian Noise{=AWGN}

address
address code modulation
address communication system
Address Complete Message
address counter
address decoder
address field
address functional instruction
address incrementing
address indicating group
address mark
address multiplicity factor
address name
address of (the) sender
address of addressee
address parameter
address register
address routing indicator
address search
address selection switch
address selection system
address signal
address table
address winding
address wire
address write wire

adjacent channel
adjacent channel frequency
adjacent channel interference
adjacent exchange
adjacent frequency selectivity
adjacent line
adjacent picture carrier
adjacent region
adjacent satellite interference
adjacent sound carrier
adjacent tone reference PSK
adjacent vision carrier

adjoint differential equation
adjoint operator

adjustable line balance
adjustable short-circuti termination

adjusting key
adjusting range

administration
administration of broadcasting and television
administration of destination
administration of origin administrative
administration of origin administrative communication distribution center

admittance matrix
admittance transformation

advance call
advance-preparation service

advanced control signal processor
Advanced Data Communication Control Procedure{=ADCCP}
advanced feed hole
Advanced Meteorological Satellite
Advanced Research Projects Agency Computer Network{=ARPANET}
Advanced Research Projects Agency(ARPA)

advice of allotment
Advice of Charge

aerial array
aerial attenuator
aerial balance
aerial bare line
aerial cable
aerial cable line
aerial circuit
aerial conductor
aerial construction
aerial input
aerial lead-in
aerial line
aerial network
aerial radio
aerial rotating equipment
aerial switching
aerial system
aerial telegraph conductor
aerial tuning indicator
aerial tuning inductance
aerial wire

aerodrome control radio
aerodrome control radio station

aeronautical advisory station
aeronautical broadcast service
aeronautical broadcast station
aeronautical communication station
Aeronautical Communications Equipment Corporation
Aeronautical Communications satellite(system)
aeronautical fixed station
aeronautical fixed telecommunication network
aeronautical ground radio station
aeronautical marker beacon station
aeronautical mobile radio service
aeronautical mobile-satellite
aeronautical navigational radio service
aeronautical radio
aeronautical radio beacon
aeronautical radio service
aeronautical radio station
aeronautical radionavigation mobile station
aeronautical radionavigation service
aeronautical satellite communication
aeronautical telecommunication
aeronautical telecommunication agency
aeronautical telecommunication service
aeronautical utility landstation
aeronautical utility mobile station

aggregate output
aggregate reversal
aggregate signal
aggregate speed
aggregate telegraph input signal
aggregate telegraph speed

air communications officer
air defense radar
air education
air force coding system
air force communication service
air force communication station
air force communications system
air force radio station
air line
air meteorological observation satellite
air operational communications network
Air Position Indicator{=API}
air telephone
air traffic control radar
AIR Traffic Control(ATC)
air transportable earth station
air wire
air-ground communication network
air-ground control radio station
air-ground liaison code
air-ground patching service
air-ground station
air-supported radome
air-surveillance radar
air-to-air communication
air-to-air missile
air-to-ground code
air-to-ground communication
air-to-ground missile

airborne communication relay station
airborne communicator
airborne data terminal set
Airborne Moving Target Indication radar
Airborne Moving Target Indication{=AMTI}
airborne radio
airborne radio installation
airborne radio station
airborne receiver
airborne receiving equipment
airborne satellite receiving station
airborne station
airborne telemetering station
airborne teletypewriter
airborne transmitter
airborne transmitting cquipment
airborne TV pick-up station

aircraft antenna，annular slot
aircraft antenna，glideslope
aircraft antenna，markerbeacon
aircraft antenna，otch
aircraft antenna，pickax
aircraft antenna，probe
aircraft antenna，tail-cap aircraft echo
aircraft interphone system
aircraft launching satellite
aircraft multiband transmitter
aircraft radio
aircraft radio mechanic
aircraft radio receiver
aircraft radio set
aircraft radio station
aircraft radiotelegraphy station
aircraft station charge
aircraft transmitter-receiver
aircraft wireless control
aircraft-to-satellite link

airway and air communication service
airway station

alarm
alarm circuit
alarm device
Alarm Indication Signal
alarm lamp
alarm message
alarm satellite
alarm signal
alarm system

Alerting
alerting signal

AlGaAs LED
AlGaAs regrowth
AlGaAs/GaAs optical repeater，integrated

alias
alias reduction

alignment
alignment frame
alignment retentio hardware，fusion splicing
alignment retention，point clamping

all band
all numbers calling
all relay automatic telephone system
all trunks-busy cyclic retest
all wave
all zero character signal
all-clear signal lamp
all-day efficiency
all-fiber component birefringence
all-fiber component directional coupler
all-fiber component isolator
all-fiber component polarization controller
all-fiber component wavelength multiplexer
all-numerical dialling
all-over-water propagation
all-pass filter
all-realy dial system
all-relay selector
all-relay system
all-space
all-trunks-busy
all-trunks-busy register
all-wave antenna
all-wave receiver
all-zero filter

allocation domain
allocation scheme

allowable distance between stations
allowable minimum distance

Allowed Cell Rate
allowed frequency

alpha code
alpha one
alpha signal
alpha two

alphabetic signal
alphabetic telegraph signal

alternate binary code
alternate channel
alternate channel interference
alternate circuit route
alternate coding key
alternate communications facility
alternate digital conversion code
alternate frequency
alternate mark inversion
alternate mark inversion code
alternate route
alternate routing
alternate routing code
alternate transmission

alternating bilinear form
alternating current dialling
alternating current selection
Alternating Current/Direct Current{=AC/DC}
alternating disjunctive normal form
alternating quadratic form

alternative frequency
alternative path
alternative route
alternative routing
alternative trunking
alternative voice data

altimeter
altimeter antenna

altitude
altitude date unit
altitude return

AM detector
AM radio receiver
AM transmitter with PWM
AM voice frequency carrier telegraph systme
AM wave
AM-to-FM converter

amateur band
amateur frequency band
amateur operator
amateur portable mobile station
amateur radio
amateur radio communication
Amateur Radio League{=ARL}
amateur radio service
amateur receiver
amateur satellite
amateur station
Amateur Station(AT)
amateur transmitter

ambiguity
ambiguity diagram
ambiguity function

ambiguous
ambiguous situation

American Broadcasting Company(ABC)
American Broadcasting System
American Bureau of Standards(ABS)
American Communication Association
American Institute of Aeronautics and Astronautics{=AIAA}
American Institute of Electrical Engineers{=AIEE}
American Institute of Radio Engineers{=AIRE}
American National Standards Institute{=ANSI}
American Radio Association{=ARA}
American Radio Relay League{=ARRL}
American Radio Telegraphists Association(ARTA)
American Standard Code for Information Interchange{=ASCII}
American Standards Association{=ASA}
American Wire Gauge{=AWG}

amplifier
amplifier bandwidth
amplifier noise
amplifier noise-equivalent circuit

amplitide limiter
amplitide lopper
amplitide taper efficiency
amplitide-modulated signal
amplitide-modulated telegraphy
amplitide-modulated telephony
amplitide-modulated transmitter

amplitude
amplitude calibration
amplitude comparison monopulse
amplitude distortion
amplitude domain multiple access
amplitude fluctuation
amplitude modulated noise
amplitude modulation carrier telegraph
Amplitude Modulation Phase Modulation{=AM-PM}
Amplitude Modulation phase Shift Keying{=AM-PSK}
Amplitude Modulation/Frequency Modulation{=AM/FM}
Amplitude Modulation{=AM}
amplitude modulation，double sideband
amplitude modulation，sideband
amplitude modulator
amplitude modulator，intensity response of
Amplitude Shift Keying{=ASK}
amplitude stability
amplitude transmitter
amplitude weighting
amplitude-frequency characteristic
amplitude-modulation coding
amplitude-modulation communication system
amplitude-phase representation

analog
analog channel
analog communication
analog companding
analog data
analog decoder
analog Direct Intensity(D-IM)modulation
analog facsimile
analog filter
analog intensity modulation
analog modulation
analog modulation，LED
analog Pulse Amplitude Modulation{=PAM}
analog Pulse Frequency Modulation{=PFM}
analog pulse modulation
analog Pulse Position Modulation (PAM)
analog Pulse Width Modulation (PAM)
analog signal
analog signal modulation
analog signal processing
analog subcarrier double sideband modulation(DSB-IM)
analog subcarrier frequency modulation(FM-IM)
analog subcarrier intensity modulation
analog subcarrier phase modulation(PM-IM)
analog system
analog transmission
analog waveform
Analog-to-Digital Conversion{=A/D conversion}
Analog-to-Digital converter{=ADC}
Analog-to-Digital{=A/D} conversion

analysis filterbank
analysis subband filter

angle discriminant(in tracking loops)
angle diversity
angle fluctuation
angle modulation
angle of diffraction
angle of elevation
angle of incidence
angle of inclination of an orbit
angle of reflection
angle of refraction
angle of scattering
angle resolution
angle tracking
angle-of-arrival

angular acceleration
angular dispersion
angular frequency
angular frequency rate
angular modulation
angular momentum control
angular separation between satellites
angular speed
angular velocity

anisotropy
anisotropy index

answer frequency
Answer Message
answer signal
answer-back unit

answering and completing jack
answering board
answering equipment
answering interval
answering set
answering supervisory lamp
answering-relay set

antenna
antenna absolute-gain measurement
antenna adapter
antenna alignment test set
antenna amplitude pattern measurement
antenna aperture
antenna aperture distribution
antenna aperture efficiency
antenna array
antenna bandwidth
antenna beam
antenna beam shape factor
antenna beam shaping
antenna beams diversity
antenna beamwidth
antenna capture area
antenna control board
antenna control console
antenna control display
antenna coverage
antenna current measurement
antenna depolarization
antenna directivity
antenna directivity diagram
antenna directivity measurement
antenna duplexer
antenna elevation angle
antenna exchanger
antenna feed
antenna follower
antenna foundation
antenna gain
antenna gain measurement
antenna highness
antenna impedance
antenna impedance measurement
antenna input impedance
antenna matching unit
antenna measurement
antenna measurement range
antenna measurement，compact rang for
antenna measurement，corrent
antenna measurement，elevated rang for
antenna measurement，extrapolation method
antenna measurement，free-space range of
antenna measurement，ground-reflection range
antenna measurement，in situation
antenna measurement，polarization-pattern method
antenna measurement，radiation patern
antenna measurement，reflection range for
antenna measurement，slant range for
antenna measurement，tapered chamber
antenna mount
antenna multicopuler
antenna noise
antenna noise temperature
antenna output
antenna output impedance
antenna pattern
antenna phase measurement
antenna platform
antenna pointing loss
antenna polar pattern measurement
antenna polarization
antenna polarization measurement
antenna polarization misalignment
antenna power gain
antenna radiation efficiency measurement
antenna radiation mechanism
antenna radiation pattern
antenna range
antenna rotating equipment
antenna servo
antenna servo system
antenna side lobe
antenna socket
antenna standing wave ratio
antenna support
antenna switch
antenna switching
antenna switching device
antenna temperature
antenna terminal
antenna tower
antenna tracking and stabilization system
antenna travelling wave ratio
antenna tuner
antenna waveguide switch
antenna-spliting device

antenna，paraboloid
antenna，paraboloid reflector

anti jamming
anti-aliasing filters
anti-click circuit
anti-fading antenna
anti-ferromagnetic
anti-interference
anti-interference antenna
anti-jam frequency
anti-jam receiver
anti-logarithm(ANTILOG)
anti-noise circuit
anti-Radiation Missile{=ARM}
anti-satellite
anti-side-tone
anti-side-tone circuit
anti-side-tone device
anti-TR
anti-TR box
anti-TR device
anti-TR switch

APC connector
APC system
APC(Adaptive Predictive Coding)
ApC/SBC hybrid coding

aperiodic
aperiodic signal

aperture
aperture antenna
aperture antennas， aperture efficiency of
aperture antennas， beam efficiency of
aperture antennas， field equivalence principle of
aperture antennas， Huygens' principle of
aperture antennas， rectangular
aperture antennas， uniform distribution
aperture area
aperture blockage
aperture coupling for cavities
aperture distortion
aperture distribution
aperture efficiency
aperture efficiency of aperture antenna
aperture field
aperture-field method
aperture-to-medium coupling loss

apertures， amplitude taper efficiency of
apertures， Bayliss circular distribution
apertures， Bayliss line source
apertures， circular distribution
apertures， cosine distribution
apertures， edge condition of
apertures， Gaussian circular distribution
apertures， Hansen distribution
apertures， leaky wave
apertures， linear distributions
apertures， parabolic distribution
apertures， phase error efficiency of
apertures， quadratic phase error of
apertures， random phase error of
apertures， sampled
apertures， scanned
apertures， separable linear
apertures， Taylor circular distribution
apertures， Taylor line source
apertures， triangular distribution
apertures， uniform distribution
apertures， Woodward line source

apogee
Apogee Kick Motor(AKM)

apparent radiometric temperature
apparent temperature

Applegate diagram，reflex klystron
Applegate diagram，two-cavity klystron

application entity
application environment
application layer

applications， civil
applications， public network
applications， submerged systems
applications， television

arc discharge
arc-fusion splicing machine

area and zip code
area code
area communication
area control center
area control frequency
area Moving Targed Indication(MTI)
area MTI
area scattering
area signal center
area signal system

arithmetic code
arithmetic coding
arithmetic decoder
arithmetic encoder

array
array antennas
array antennas， planar
array antennas， sidelooking(SLAR)
array bandwidth
array directivity
array factor
array feed network
array polynomial
array synthesis

array， end-fire(ordinary)
array， Fourier series expansion synthesis of
array， IC
array， pattern multiplication of
array， phased
array， planar
array， progressive phase shift of

arrival angle
arrival bearing
arrival wave

articulation
articulation efficiecy
articulation index
articulation reduction

artificial antenna
artificial black signal
artificial dielectrics
artificial error signal
Artificial Intelligence{=AI}
artificial ionization
artificial line
artificial load
artificial reflection communication
artificial traffic
artificial traffic equipment
artificial transmission line
artificial voice
artificial white signal

assigned chanell
assigned frequency
assigned frequency band

assignment key
assignment of call sign
assignment selector
assignment switch

associated Legendre functions
Associated Press(AP)

association
Association Control Service Element(ACSE)
Association for Computing Machinery{=ACM}
association scheme

astronomical constant
astronomical satellite

asymmetric
asymmetric protocol

asymmetrical coupler
asymmetrical distortion
asymmetrical sideband transmission

asynchronous
Asynchronous Balanced Mode{=ABM}
asynchronous block transmission
asynchronous communication interface adapter
asynchronous communication satellite
asynchronous crypto unit
asynchronous data transmission
asynchronous DS-CDMA
asynchronous interfaces
asynchronous operation
Asynchronous Response Mode(ARM)
asynchronous signaling
asynchronous start-stop， teletypewriter
asynchronous system
asynchronous terminal
Asynchronous Time Division Multiplexer{=ATDM}
asynchronous time division multiplexing
Asynchronous Transfer Mode{=ATM}
asynchronous transmission

ATM Adaptation Layer{=AAL}
ATM Block Transfer
ATM Protocol Data Unit
ATM Transfer Capability(ATC)
ATM-PDU(ATM Protocol Data Unit)

atmospheric absorption
atmospheric attenuation
atmospheric backscatter
atmospheric clutter
atmospheric composition satellite
atmospheric disturbance
atmospheric duct
atmospheric ducting
atmospheric emission
atmospheric loss
atmospheric noise
atmospheric path loss
atmospheric refraction
atmospheric transmission
atmospheric turbulence
atmospheric window

ATR box
ATR switch
ATR tube
ATR(Anti-Transmitter Receiver)

attendant
attendant board
attendant's desk

attenuation
attenuation coefficient
attenuation cutoff wavelength
attenuation distortion
attenuation drawing effect
attenuation measurement of absorption loss in fiber
attenuation measurement， portable test set for
attenuation measurement， potical time domain reflectrometry(OTDR) for
attenuation of 1.55 μm transmission
attenuation pad
attenuation reduction

attenuation， adjacent-channel
attenuation， connectors
attenuation， end-face quality extrinsic
attenuation， ferrule-to-ferrule alignment mechanism
attenuation， free-space
attenuation， hydrogen and radiation induced losses
attenuation， hydrometer
attenuation， lightwave communicatins system
attenuation， microwave radiation
attenuation， multimode fibers
attenuation， Rayleight scattering
attenuation， single-mode fibers splicing
attenuation， stability

attenuator， precision
attenuator， variable

attitude
attitude control error

audible beat
audible busy signal
audible call
audible ring
audible ringing signal
audible signal
audible signal panel
audible test
audible tone

audio
audio access unit
audio amplifier
audio band
audio bandwidth
audio buffer
audio coder
audio communication system
audio compressor-expander
audio connecting equipment
audio data
audio decade oscillator
audio frame
audio frequency
audio frequency aggregate signal
Audio Frequency Amplifier{=AFA}
audio frequency band
audio frequency shift keying
audio frequency telegraph
audio frequency tone
Audio Frequency{=AF}
audio gain
audio input frequency tolerance
audio line
audio modulation
audio modulation detector
audio oscillator
audio playback unit
audio programmelink transmitter
audio repeater
audio sequence
audio track
audio-frequency coder
audio-frequency peak limiter
audio-frequency point
audio-frequency transformer

aurora
aurora backscatter

auto transit
auto transit telex facility
auto-alarm receiver
auto-coding
auto-command signal
auto-distress signal apparatus
auto-dyne radio
auto-dyne receiver
auto-manual switch
auto-munual exchange
auto-stop mechanism

autocorrelation
autocorrelation function

Automatic Addressing System{=AAS}
automatic air-ground communication system
automatic alarm receiver
automatic alternate route
automatic alternate voice/data
automatic alternative routing
automatic answer trunk
automatic antenna tuner
automatic antijam circuit
Automatic Audio Switching system{=AAS}
automatic bandwidth control
automatic bass compensation
automatic bias control
automatic binary data link
automatic block system
automatic call distribution
automatic call distributor
automatic call simulator
automatic call unit
automatic calling and answering equipment
automatic circuit breaker
automatic circuit exchange
automatic clearing apparatus
automatic clearing key
automatic code
automatic code machine
automatic code translation
automatic communication monitor
automatic computer telex servie
automatic computer telex system
automatic concentrator
Automatic Congestion Level
automatic data exchange system
automatic data interchange system
automatic data link
automatic data processor
automatic data rate changer
automatic data reducer
automatic data service center
automatic data translator
automatic dial
automatic dial service
automatic dialing system
automatic digital data acquisition and recording
automatic digital encoding system
automatic digital message switch
automatic digital message switching center
automatic digital network
automatic direct connection system
Automatic Direction Finding{=ADF}
automatic distribution phonogram equipment
automatic diversion
automatic docket-printing facility
automatic dot keyer
automatic drop
automatic electronic switching center
automatic equalizer
automatic error correction
automatic error correction device
automatic error correction system
automatic error detection
automatic error detection and retransmission
automatic error indication
automatic error-correcting code
automatic exchange
automatic exchange operation
automatic exchange technique
automatic fine tuning
automatic frequency control generator
automatic frequency control receiver
Automatic Frequency Control{=AFC}
automatic frequency correction
automatic frequency stabilization
automatic frequency tuner
automatic gain controlled bipolar amplifier
automatic gain controlled undersea amplifier
automatic gain controller
Automatic Gain Control{=AGC}
Automatic Gain Control{=AGC}Receiver
automatic gain stabiliztion
automatic gimbaled-antenna vectoring equipment
automatic group-busying facility
automatic handling system
automatic holding
automatic hunting
automatic inspection
automatic intercept
automatic international exchange
automatic key
automatic leased teletype write switching
automatic level control
automatic line switching
automatic listening
automatic local frequency control
automatic low data rate input
Automatic Message Accounting{=AMA}
automatic message address routing system
automatic message distribution system
automatic message exchange system
automatic message handling system
automatic message processing system
automatic message processng center
automatic message switching center
automatic message switching network
automatic message-switching system
automatic monitoring
automatic Morse code operation
automatic multi-media exchange
automatic multiple address relay system
automatic national trunk network
automatic number identification
automatic number identification equipment
automatic numbering equipment
automatic numbering machine
automatic outgoing international equipment
Automatic Phase Control system
automatic picture transmission system
automatic plexicoder
automatic power control
automatic processing equipment
automatic queuing phonogram equipment
automatic radio direction finding system
automatic radio monitor
automatic re-routing
Automatic Repeat reQuest{=ARQ}
automatic reperforator switching
automatic repetition
automatic repetition system
automatic reporting
automatic request
automatic request for repetition
automatic request system
automatic response query(message)
automatic retransmission
automatic ringing
automatic routing
automatic routing apparatus
automatic secure voice communication
automatic selection
automatic selection of balance network
automatic sender-receiver
automatic sensitivity control
automatic signaling
automatic spectrum occupancy
automatic storage and retransmission equipment
automatic storage equipment
automatic subscriber dialing
automatic subscriber line testing equipment
automatic supervisory control
automatic switch
automatic switchboard
automatic switched channel
automatic switched telegraph equipment
automatic switching
automatic switching center
automatic switching network
automatic switching system
automatic switchover
automatic synchronizer
automatic synchronizing system
automatic tandem networking
automatic telegraph transmission
automatic telephone
automatic telephone call
automatic telephone exchange
automatic telephone set
automatic telephone switchboard
automatic telephone system
automatic teletypewriter switching equipment
automatic test and checkout equipment
Automatic Test Equipment{=ATE}
automatic test-phrase transmitter
automatic time element compensator
automatic timing corrector
automatic toll dialling
automatic toll switching system
automatic toll ticketing
automatic tone correction
Automatic Track While Scanning{=ATWS}
automatic tracking
automatic traffic
automatic traffic distributor
automatic transit telex network
automatic transmission
automatic trunk exchange
automatic trunk service
automatic tuning
automatic typewriter
automatic voice link
automatic voice network
automatic voice relay
Automatic Volume Control{=AVC}
automatic-alarm-signal keying device
automatic-answer back unit
automatic-frequency-control system

autotune
autotune transmitter

auxiliary antenna
auxiliary channel
auxiliary circuit
auxiliary conditions
auxiliary connection
auxiliary data processing equipment
auxiliary data translator unit
auxiliary equipment
auxiliary frequency
auxiliary interphone equipment
auxiliary line
auxiliary network
auxiliary potential functions
auxiliary receiver
auxiliary return
auxiliary route
auxiliary selector
auxiliary station
auxiliary telex route
auxiliary transmitter

Available Bit Rate
available channel
available circuit
available input signal power
available line time
available output signal power
available power
available power gain

avalanche buildup time
avalanche excess noise
avalanche excess noise factor
avalanche multiplication
avalanche photodetector bandwidth
Avalanche PhotoDiode(APD)

average calling rate
average daily calling rate
average daily load
average delay
average effective inputnoise temperature
average grade of service
average handling time
average holding time
average information
average line load
average message length
average mutual information
average peak-hour line loading
average picture level
average power
average repeater section attenuation
average room noise
average service rate
average talker volume
average traffic flow
average traffic per working day

aviation radio
aviation radio communication

axial defocusing
axial propagation constant
axial ratio

azimuth angle
azimuth compression
azimuth followup system
Azimuth Speed Indicator{=ASI}
azimuth tracking accuracy
azimuth-elevation axis mount

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