1674 Chapter 48
National Association of Broadcasters NAB
National Association of the Deaf NAD
National Broadcasting Company NBC
National Bureau of Standards NBS
National Electrical Code NEC
National Electrical Contractors Association NECA
National Electrical Manufacturers Association NEMA
National Fire Protection Association NFPA
National Institute Of Occupational Safety And
HealthNIOSHNational Systems Contractors Association NSCA
National Television Standards Committee NTSC
National Television System Committee NTSC
near end cross talk NEXT
near-instantaneous companding NICAM
needed acoustic gain NAG
negative-positive-negative NPN
neper Np
network address translation NAT
network operations center NOC
neutral density filter N/D
newton N
newton meter N·m
newton per square meter N/m^2
no-epoxy/no-polish NENP
noise figure; noise frequency NF
noise reduction coefficient NRC
noise voltage En
noise-operated automatic level adjuster NOALA
nonreturn-to-zero inverted NRZI
normal link pulses NLPs
number of open microphone NOM
numerical aperture NA
oersted Oe
Office de Radiodiffusion Television Francois ORTF
ohm :
on-screen manager OSM¥
open system interconnect OSI
open-circuit voltage Eo
operational transconductance amplifier OTA
operations support systems OSS
opposed current interleaved amplifier OCIA
optical carrier OC
optical time domain reflectometer OTDR
optimized common mode rejection OCMR
optimum power calibration OPCTable 48-9. Recommended Abbreviations
Unit or Term Symbol or
Abbreviationoptimum source impedance OSI
optoelectronic integrated circuit OEIC
organic light emitting diode OLED
orthogonal frequency division multiplexing OFDM
ounce (avoirdupois) oz
outer hair cells OHC
output level in dB Lout
output voltage EOUT
outside diameter OD
oxygen-free, high-conductivity copper OFHC
pan/tilt/zoom PTZ
parametric room impulse response PRIR
pascal Pa
peak amplitude Ap
peak program meter PPM
peak reverse voltage PRV
peak-inverse-voltage piv
peak-reverse-voltage prv
peak-to-peak amplitude Ap-p
percentage of articulation loss for consonants %Alcons
Perfluoroalkoxy PFA
permanent threshold shift PTS
personal listening systems PLS
phase alternation line PAL
phase angle I
phase frequency curve PFC
phase locked loop PLL
phase modulation PM
phonemically balanced PB
physical medium dependent PMD
pickup PU
picoampere pA
picofarad pF
picosecond ps
picowatt pW
picture in picture PIP
pinna acoustic response PAR
pint pt
plain old telephone service POTS
plasma PDP
plastic insulated conductor PIC
plate current Ip
plate efficiency Eff
plate resistance rp
plate voltage Ep
point-to-point protocol PPPTable 48-9. Recommended Abbreviations
Unit or Term Symbol or
Abbreviation