One-Net/DASDEC User Manual
5-119
v3.0 | r1016
Alert Type Priority Selection
Use this interface to configure the associated priority
number for EAS alert codes. The scheme is based upon five EAS groups: Advisories,
Tests, Watches, Warnings, and Emergencies. The exact alerts that fall into each
category are defined on the EAS device at
System > Help > EAS Codes
.
DVS644/SCTE18 provides for 16 priority values (0-15). However, reserved uses for most
values means that in practice, priority values are 0, 3, 7, 11 and 15, with 15 being the
highest priority alerts. The priority of 0 has a special meaning. An alert sent with 0
priority will establish a new set-top box or TV sequence number. The sequence number
is incremented (modulo 32) whenever an alert is sent with updated information. The
EAS device supports this reset mode by allowing an alert to be set to 0 priority. This
setting should only be used for one alert and then changed to 1-15. There is also a field
to extend the alert duration past the default EAS device audio duration. Keep in mind
that the maximum allowed time for a DVS644/SCTE18 message is 120 seconds.
Immediate Start (Alert Start Time)
This check box sets the EAS Alert message start time on the receiving device. When
enabled, the start time of the alert on the receiving device is immediate upon
reception. When disabled (unchecked), the Alert Start Time is set to use a clock-based
start time. The actual time used is the EAS alert UTC.
NPT initial duration 120 secs
When unchecked, the NPT initial duration is 0 – which means this live alert is open-
ended. Once the EOM is reached a second message with a 5 second duration is sent
which ends the NPT alert. By selecting this check box, a fixed duration of 2 minutes is
forwarded within the NPT.
Multiple Language Alert Text
Allows SCTE-18 to send multiple language translations to the SCTE-18 connected
device.
Alert Text Control
This pull-down menu programs when the alert text section of the DVS-644/SCTE18
message is sent, based on alert priority. It allows text to not be sent if the priority
becomes higher than a specified value and allows the STB to omit alert text crawls
when a force tune to a details channel is made based upon alert priority.
Alert Repeat Control
and
Alert Message Repeat Period
The EAS device can be configured to periodically resend the alert message, with the
DVS644/SCTE18 Cable Alert message field
alert_time_remaining
field decremented
automatically. This is controlled using the
Alert Repeat Control
selections.
The options
are based on alert priority, allowing repetition to be invoked for alerts above a given
priority. When repetition is selected, the
Alert Message Repeat Period
field for
entering the time period (in seconds from 6 to 60) is also displayed.
Alert Message Transmission Duplication Count (1-20)
When a forwarded/originated alert is sent to a DVS-644 client at a specific IP address,
the DVS-644/SCTE-18 MPEG-2 system table is generated and sent to the MPEG
multiplexor client. Programming this interface controls the number of times the table is
sent as a duplicate, from 1 - 20 times, to insure downstream reception.
Additional Start Delay Time (seconds)
This check box allows time to be added before the DVS644/SCTE18 Cable Alert
Message is first sent over the network. The formula for the delay time is: Start Delay ==
(Audio Delay if enabled) + Additional Time.
Caution
If a clock time is used,
it is CRITICAL that the
EAS device and the
receiving device be time
synchronized.
