become visible in the graph as highlighted boxes defining minimum and maximum values for impulse
time and power for each enabled impulse. Threshold templates are defined in the
COFDM — COFDM
threshold
view. A DVB-T/T2 threshold template is assigned to a DVB-T/T2 stream in the
COFDM —
Tuning setup view.
Impulse time and power are listed at the right hand side of the impulse response graph. Power peaks
that are lower than the impulse detection limit are not listed. The impulse detection limit is displayed in
the graph as a bold light grey grid line.
If an impulse peak does not fall within its threshold limit box, the box color will change to red and an alarm
is raised. Note that ‘SFN measurements’ must be enabled in the ETR thresholds template associated
with a DVB-T/T2 stream for impulse check alarming to be active. ETR threshold templates are defined
in the
ETR 290 — ETR thr.
view. An ETR threshold template is assigned to a DVB-T/T2 stream in the
COFDM — Tuning setup view.
6.12.5 COFDM — RF overview
The RF parameters and measurements list gives a status overview of all monitored DVB-T/T2 frequencies
from the selected RF input. The parameters and measurements in this list refer to the last completed
monitoring period or, for a stream currently monitored, the current monitoring period.
List of RF parameters and measurements:
Frequency: The stream frequency that the associated parameters apply to
Trans. System: The transmission system: DVB-T or DVB-T2
Channel spacing: The channel bandwidth
TS sync: Transport stream sync: yes or no
Min level: The minimum RF signal level
Max level: The maximum RF signal level
Min SNR: The minimum signal to noise ratio
Min MER: The minimum calculated modulation error ratio
Max pre FB: The maximum bit error rate before Viterbi or LDPC error correction
Max post FB: The maximum bit error rate before BCH error correction
Max post BF: The maximum bit error rate after BCH error correction
1 PPS lock: An indication of reference signal lock. The value may be ‘Locked’ or ‘No lock’.
Max SFN drift: The maximum SFN drift (in µs) detected during the monitoring period
VB2xx GigE User’s Manual version 5.4 191
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