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Screen Service SDT 200UB – SDT 500UB ARK-1 ATSC Operations
July, 2009 v 1.0 Page 3 - 56
3.7.5 Modes switching rules
Four switching rules are provided in order to cover different requirements:
• Manual: switch between mode A and mode B by selecting one mode using the
Manual Selector. The selected mode is always enabled until the user selects the
other one.
• Auto: switch between mode A and mode B using the rules shown in the following
table. One mode is enabled until at least one of the alarms associated to the
enabled automatic switch rules is raised, then a countdown starts and, if the
parameter doesn’t regain a normal status during the timeout, the device switches
to the other mode.
Table 10. Auto-switch rules
Mode Autoswitch rules
ITU 470
modulator
Not implemented
ATSC
modulator
No RF: video carrier not locked by the DVB-T receiver. It is associated to
the No RF Input alarm. (Not implemented)
Input Squelch: Received signal level under the squelch threshold. It is
associated to the RF Input Squelch alarm. (Not implemented)
Tuner BER: Bit Error Rate after demodulator over the BER threshold. It
is associated to the RF Digital BER Alarm alarm. (Not implemented)
Tuner S/N: Signal to Noise ratio under the S/N threshold. It is associated
to the S/N Level alarm. (Not implemented)
No TS Input: selected TS input not locked. TS input Alarm should be
enabled in the RF Off alarms mask. It is associated to the No Input alarm.
• Opto: switch between mode A and mode B by selecting one mode using the Opto
2 input with the following rules:
o 1 – Open: Mode A.
o 0 – Closed: Mode B.
• Time: switch from mode A to mode B at a specified Date and Time (Switching
Time). Switching will happen only one time from A to B. In order to set the
Switching Time, select hours, minutes, seconds, days, months and years, and
click on up/down arrows to increase/decrease them.
3.7.6 Tuner management
These commands allow the setting of BER alarm threshold and monitoring of RF input
status.
The following table shows all the commands and indicators available.