BridgeTech VB20 User Manual page 199

The QAM threshold parameters are:
Name: A text field describing the threshold template
Maximum pre FEC
Maximum post FEC
Maximum MER: Threshold level for modulation error ratio (dB)
Minimum signal to
noise ratio:
Minimum signal
strength:
Maximum signal
strength:
Signal strength
offset:
Maximum frequency
offset:
Frequency offset
zero adjust:
Maximum symbol
rate offset:
Maximum symbol
zero adjust:
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QAM threshold - Edit:
Threshold level for bit error ratio before forward error
BER: correction
Threshold level for bit error ratio after forward error
BER: correction
Threshold level for signal to noise ratio (dB)
Minimum threshold level for 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
dBuV: in decibels relative to a reference value of 1µ V
dBmV: in decibels relative to a reference value of 1mV
Maximum threshold level for 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
dBuV: in decibels relative to a reference value of 1µ V
dBmV: in decibels relative to a reference value of 1mV
It is possible to use the signal strength offset adjustment
to calibrate the QAM demodulator. This is achieved by
tuning to a QAM signal of known level and setting this
adjustment accordingly. Only relevant for VB262.
Maximum QAM centre frequency offset. Only relevant for
VB262.
It is possible to use the frequency offset zero adjustment
to calibrate the measurement. This is achieved by
compensating for the frequency offset measurement done
at the time of calibration in order to get a measurement
close to zero. The auto threshold functionality does this
automatically. Only relevant for VB262.
Maximum QAM symbol rate offset. Only relevant for
VB262.
It is possible to use the symbol rate offset zero adjustment
to calibrate the measurement. This is achieved by
compensating for the symbol rate offset measurement
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