The DVB-T/T2 threshold parameters are:
DVB-T/T2 threshold — Edit:
Name: A text field describing the threshold template
Maximum pre Viterbi/LDPC BER:
Threshold level for bit error ratio before Viterbi or LDPC error
correction
Maximum pre RS/BCH BER:
Threshold level for bit error ratio before Reed-Solomon or BCH
error correction
Maximum post BCH FER: Threshold level for bit error ratio after BCH error correction
Minimum MER: Threshold level for calculated modulation error ratio
Minimum signal to noise ratio: Threshold level for signal to noise ratio (dB)
Minimum signal strength:
Threshold level for minimum signal strength. This is a measure
of the stream signal power. It is expressed according to the level
mode selection made in the Setup — ETR view:
dBm: in decibels relative to a reference value of 1mW
dBμV: in decibels relative to a reference value of 1μV
dBmV: in decibels relative to a reference value of 1mV
Maximum signal strength:
Threshold level for maximum signal strength. This is a measure
of the stream signal power. It is expressed according to the level
mode selection made in the Setup — ETR view:
dBm: in decibels relative to a reference value of 1mW
dBμV: in decibels relative to a reference value of 1μV
dBmV: in decibels relative to a reference value of 1mV
Maximum frequency offset: Threshold level for maximum center frequency offset
Frequency offset zero adjust: Allows to define calibration adjustment for frequency offset
Maximum LDPC iterations:
Threshold level for Low-density parity-check iteration counter
(only for DVB-T2)
The impulse response checking threshold values are only relevant when the probe is licensed with the
Advanced RF Option
. Threshold values for each impulse will become visible in the
COFDM — Impulse
response
view as a highlighted box in the impulse response graph. If an impulse peak does not fall
within its box an alarm will be raised. Threshold values for a maximum of ten impulses may be defined.
Impulse response checking:
Impulse detection limit:
The impulse detection limit in dB. Signal peaks with lower level than the
detection limit will be regarded as noise and not considered an impulse.
Enable:
It is possible to enable or disable time location and level check of an
impulse. Mark the ‘Enable’ check-box for the probe to raise alarm if an
impulse peak is not found within the graph box defined by the specified
time and power limits.
Name:
A text string specified by the user to name an impulse. Typically this will
be the name of a transmitter.
VB2xx GigE User’s Manual version 5.4 189
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