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abandoned call 
abbreviated dialing 


delay 
gain 
temperature 
absorption 
absorption band 
absorption coefficient 
absorption index 
absorption loss 
absorption modulation 
 

acceptance angle 

acceptance pattern 

acceptance testing 


access attempt access point 

access time 
accounting management 
accumulator 
accuracy 

ac-dc ringing 
ACK 
acknowledge character (ACK) 
acknowledgement 
acknowledgement delay period 

acoustic coupler 

 

ALU 
AM 
AMA 
amateur-satellite service 
amateur service 
amateur station 
ambient noise level 
ambient temperature 
AME 
American National Standards Institute (ANSI) 
American Standard Code for Information Interchange (ASCII) 
AMI 
AMI violation 
amplifier 
amplitude distortion 
amplitude equalizer 
amplitude hit 
amplitude intensity modulation (AIM) 
amplitude keying 
amplitude modulation (AM) 
amplitude modulation equivalent (AME) 
amplitude-vs.-frequency distortion 
AMPS 
AMTS 
analog computer 
analog data 
analog decoding

alphanumeric character set 

 

 acoustic wave 
acousto-optics 
acquisition 
acquisition time 
active device 
active laser medium 
active satellite 
active sensor 
active star 
activity factor 
ACU 
A-D 
Ada� 
adaptive channel allocation 
adaptive communications 
adaptive differential pulse-code modulation (ADPCM) 
adaptive equalization 
adaptive predictive coding (APC) 
adaptive radio 
adaptive routing 
adaptive system 
ADC 
ADCCP 
added bit 
added block 
adder 
adder-subtracter 
additive white gaussian noise (AWGN) 
add mode 
add-on conference 
address 
addressability 
addressable point 
address field 
address-indicating group (AIG) 
address message 
address message sequencing 
address part 
address pattern 
address resolution protocol (ARP) 
address separator 
ADH 
adjacent-channel interference 
adjunct service point (ASP) 
administration 
administrative management complex (AMC) 

alphanumeric code 
alphanumeric data 
alpha profile 
altazimuth mount 
alternate mark inversion (AMI) signal 
alternate party 
alternate routing 
altitude of the apogee or of the perigee 

radio frequency channel) 
all-silica fiber 
all trunks busy (ATB) 
alphabet 
alphabetic character set 
alphabetic code 
alphabetic string 
alphabetic word 
alphabet translation 
alphabet transliteration 
alphanumeric 

 ADP 
ADPCM 
ADPE 
ADP system 
Advanced Data Communication Control Procedures (ADCCP) 
advanced intelligent network (AIN) 
advanced television (ATV) 
AECS 
aerial cable 
aerial insert 
aeronautical advisory station 
aeronautical broadcast station 
aeronautical Earth station 
Aeronautical Emergency Communications System (AECS) Plan 
aeronautical fixed service 
aeronautical fixed station 
aeronautical mobile (OR) [off-route] service 
aeronautical mobile (R) [route] service 
aeronautical mobile-satellite service 
aeronautical mobile-satellite (OR) [off-route] service 
aeronautical mobile-satellite (R) [route] service 
aeronautical mobile service 
aeronautical multicom service 
aeronautical radionavigation-satellite service 
aeronautical radionavigation service 
aeronautical station 
AF 
AFNOR 
AGC 
AI 
AIM 
AIN 
AIOD 
AIOD leads 
airborne radio relay 
air-conditioning 
aircraft Earth station 
aircraft emergency frequency 
aircraft station 
airdrome control station 
air-ground radiotelephone service 
air-ground worldwide communications system 
air portable 
airport control station 
air sounding 
air terminal 
AIS 
alarm center 
alarm indicator 
alarm sensor 
a-law 
a-law algorithm 
ALE 
algorithmic language 
aligned bundle 
Allan variance 
allcall 
all-glass fiber 
allocation (of a frequency band) 
allotment (of a radio frequency or