dB - Decibel
dBm - Decibels referenced to one milliwatt
dBmV - Decibels referenced to one millivolt
dBµV - Decibels referenced to one microvolt
Delta V/A - Delta Video to Audio -- Calculated by subtracting the (first
if DUAL) audio carrier level from the video carrier level (for analog
TV and DUAL type channels only)
DOCSIS - Data Over Cable Service Interface Specification (DOCSIS is a trademark
or registered trademark of CableLabs in the United States and/or other
countries.)
EVM - Error Vector Magnitude
Headroom (also called Overhead or Margin) - The number of decibels (dB)
by which a measurement exceeds the minimum defined requirements. The benefit
of headroom is that it reduces the bit-error rate (BER), and provides
a performance 'safety net' to help ensure that current and future high
speed applications will run at peak accuracy, efficiency and throughput
regardless of seasonal temperature changes on the HFC distribution system.
kHz - Kilohertz
MER - Modulation Error Ratio
MHz - Megahertz
QAM - Quadrature Amplitude Modulation
QPSK - Quadrature Phase Shift Keying