Ross Opengear UDC-8625A Series, Руководство пользователя, Страница: 74 / 174

5–6 • Ancillary Data UDC-8625A Series User Manual (Iss. 11)
• Do Nothing — The card ignores the OP-47 missing packet and does not insert
anything in its place.
• Duplicate Last Packet — The card replaces the missing packet with the last valid
OP-47 packet detected.
To enable OP-42 Cleardown control
1.
From the Device View , select the ANC tab.
2.
Locate the OP-42 Cleardown Control area on the ANC tab.
ANC Tab — OP-42 Cleardown Control Options
3. Select the Auto Cleardown box to allow the UDC-8625A series card to insert a blank
page with a clear down signal when no OP-42 subtitles are detected on Line 21 (or the
value specified in the
OP-42 Encode/Decode Line menu). This button is used in
conjunction with the Auto Cleardown Delay duration.
4. Use the Auto Cleardown Delay field to specify the amount of time that an absence of
data occurs before the card inserts the blank page with a clear down signal. The default
setting is 10 seconds.
5. Click the Force Cleardown Now button to immediately insert a blank page with a
clear down signal.