Abbreviations and Technical Terms
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NsMargin
(
Noise Margin
) Reserve of the signal to the noise level (up to the "fall of
the cliff effect" with digital signals)
OMI
Optical modulation index
PER
The
Packet Error Ratio
indicates the number of incompletely received data
packets as a proportion of all transmitted packets (after Viterbi).
QEF
(
Quasi Error Free
) Bit error rate equal to 2.00e-4
Noise level
Sum of noise factor and thermal background noise. Noise is caused by
physically induced molecular motion in electrical conductors.
RMS
(
Root Mean Square
) Method for quadratic averaging
S/N
(
Signal to Noise
) Difference between desired signal and noise level in dB;
S/N ≈ C/N + 1.5; see also
C/N
SPTS
Single Program Transport Stream
TSID
(
Transport Stream ID
) Transponder/multiplex ID
VBR
(
Variable Bit Rate
) Used in measurements on SPTS signals, see
CBR
VPID
(
Video Packet Identifier
) Video reception parameters in the MPEG data
stream