BridgeTech VB20 User Manual page 144

Tuning duration The time (in seconds) the probe will stay tuned to a
(s): frequency/multicast during the round-robin loop.
For setting the tuning duration, use the following expression:
max_table_rep*2+10
Use the maximum table repetition, multiply by 2 and then add
10 seconds. E.g. with TDT table repetition set to 30 seconds,
use 30*2+10=70 seconds tuning duration.
In order to speed up the tuning process tables should be
transmitted more frequently. For instance if TDT, which is
usually the least frequently transmitted table, is sent every 10
seconds, a tuning duration of 30 seconds may be used. For
signals without TDT (common in SPTS) the TDT check can be
disabled and the tuning duration may be reduced.
If only RF measurements are performed, the minimum
recommended tuning duration is 30 seconds.
If the tuning duration is set too low the checks for tables with
long table repetition periods will still be in an unknown state
as the probe does not have enough measurements to
determine the state for these. Tuning duration should never be
set to less than 10 seconds for Ethernet streams and 15
seconds for all other streams. Default value: 70 s
Sync loss tuning The time (in seconds) the probe will stay tuned to a
duration (s): frequency/multicast with TS Sync loss during the round-robin
tuning process. Usually there is no need to stay tuned to a
frequency/multicast once the probe has established that there
is no signal on the tuning setup. When monitoring a tuning
setup with signal loss, the probe will use the lowest value of
'Tuning duration' and 'Sync loss tuning duration', e.g. if the
former is set to 60 seconds and the latter to 1000 seconds, 60
seconds will be used. Default value: 15 s
Minimum section The minimum gap between transmission of two consecutive
gap (ms): sections with the same table ID. If the sections are transmitted
too rapidly the STB may not be able to process the data in
time and various problems can occur. However newer STBs
can normally handle lower section gaps than the default value
of 25ms.
The section gap time is measured as the time between
reception of the last TS packet of two consecutive (complete)
sections.
This section gap setting is used for PAT, PMT, CAT, NIT, RST,
TDT, MGT, VCT, PIM/PNM, RRT, ATSC EIT, ETT and STT. There
are separate gap settings for SDT and EIT. Default value: 25
ms
PROBE USERS' MANUAL VERSION 5.0
2014 © BRIDGE Technologies Co AS - Bentsebrugata 20 - N-0476 Oslo, Norway - tel: +47 22 38 51 00 -
www.bridgetech.tv
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