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echo line 
echoplex 
echo return loss 
echo sounding 
echo suppressor 
ECM 
edge busyness 
edge-emitting LED 
EDI 
EDTV 
effective antenna gain contour (of a steerable satellite beam) 
effective boresight area (of a steerable satellite beam) 
effective data transfer rate 
effective Earth radius 
effective height 
effective input noise temperature 
effective isotropically radiated power (e.i.r.p.) 
effective mode volume 
effective monopole radiated power (e.m.r.p.) 
effective power 
effective radiated power (e.r.p.) (in a given direction) 
effective speed of transmission 
effective transmission rate 
efficiency factor 
EHF 
EIA 
EIA Class IVa fiber 
EIA Class IVb fiber 
EIA interface 
eight-hundred (800) service 
elastic buffer 
E layer 
electrical length 
electrically powered telephone 
electric field 
electrochemical recording 
electrographic recording 
electroluminescence 
electrolytic recording 
electromagnetic compatibility (EMC) 
electromagnetic emission control 
electromagnetic environment (EME) 
electromagnetic interference (EMI) 
electromagnetic interference (EMI) control 
electromagnetic intrusion 
electromagnetic pulse (EMP) 
electromagnetic radiation (EMR) 
electromagnetic radiation hazards (RADHAZ or EMR hazards) 
electromagnetic spectrum 
electromagnetic survivability 
electromagnetic vulnerability (EMV) 
electromagnetic wave (EMW) 
electromechanical recording 
electronically controlled coupling (ECC) 
electronic classroom 
electronic commerce 
electronic counter-countermeasures (ECCM) 
electronic countermeasures (ECM) 
electronic deception 
electronic emission security 
electronic jamming 
electronic line of sight 
electronic line scanning 
electronic mail (E-mail) 
electronic message system (EMS) 
electronic reconnaissance 
electronics intelligence (ELINT) 
electronics security (ELSEC) 
electronic switching system (ESS) 
electronic warfare (EW) 
electronic warfare support measures (ESM) 
electro-optical intelligence (ELECTRO-OPTINT) 		 ELSEC 
E-mail 
emanations security (EMSEC) 
embedded base equipment 
embedded customer-premises equipment 
embedded processor 
EMC 
EMC analysis 
EMCON 
EMD 
EME 
Emergency Broadcast System (EBS) 
emergency locator transmitter (ELT) 
emergency position-indicating radiobeacon station 
EMI 
emission 
emission control (EMCON) 
emission security 
emission spectrum 
emissivity 
EMP 
emphasis 
EMR 
EMR hazards 
e.m.r.p. 
EMS 
EMSEC 
emulate 
EMV 
enabling signal 
en-bloc signaling 
encapsulation 
encipher 
encode 
encoder 
encoding 
encoding law 
encrypt 
end distortion 
end exchange 
end finish 
end instrument 
end office (EO) 
end-of-medium character 
end-of-message function 
end-of-selection character 
end-of-text character (ETX) 
end-of-transmission-block character (ETB) 
end-of-transmission character (EOT) 
endpoint node 
end system (ES) 
end-to-end encryption 
end-to-end security 
endurability 
endurable operation 
end user 
engineering channel 
engineering orderwire (EOW) 
enhanced-quality television 
enhanced service 
ENQ 
enquiry character (ENQ) 
E / N ratio 
entrance facility 
entrance point 
entrance room 
envelope 
envelope delay distortion 
environmental control 
environmental security 
EO 
EOT 

electrophotographic recording 
electrosensitive recording 
electrostatic recording 
electrothermal recording 
elemental area 
elementary signaling element 
elevated duct 
ELF 
ELINT 
elliptical polarization 

EOW 
E-plane bend 
epoch date 
equal gain combiner 
equalization 
equal-length code 
equal-level patch bay 
equatorial orbit 
equilibrium coupling length 
equilibrium length 
equilibrium mode distribution (EMD) 
equilibrium mode distribution length 
equilibrium mode power distribution 
equilibrium mode simulator 
equipment clock 
equipment intermodulation noise 
equipment room 
equipment side 
equipotential ground plane 
equivalent network 
equivalent noise resistance 
equivalent noise temperature 
equivalent pulse code modulation (PCM) noise 
equivalent satellite link noise temperature 
erase 
erect position 
E region 
erlang 
erroneous block 
error 
error blocks 
error budget 
error burst 
error control 
error-correcting code 
error-correcting system 
error-detecting-and-feedback system 
error-detecting code 
error-detecting system 
error message 
error rate 
error ratio 
error signal 
e.r.p. [ or ERP] 
ES 
ESC 
escape character (ESC) 
ESF 
ESM 
ESS 
essential service 
ETB 
Ethernet 
ETX 
evanescent field 
evanescent mode 
even parity 
event 
EW 
exalted-carrier reception 
exception condition 
excess insertion loss 
exchange 
exchange access 
exchange area 
exchange facilities 
executive program 
exempted addressee 
existing quality television 
expander 
expansion 
expansion capability 
expedited data unit 
experimental station 
expert system (ES) 
express orderwire

electro-optic detector 
electro-optic effect 
electro-optic modulator 
electro-optics 
ELECTRO-OPTINT