Ross Opengear UDC-8625A Series, User Manual, Page: 71 / 174

UDC-8625A Series User Manual (Iss. 11) Ancillary Data • 5–3
HANC Pass Through or VANC Pass Through
The HANC Pass Through and VANC Pass Through settings only apply when the output and
the input have the same format. If the input is not synchronous to the output, entire frames of data
are duplicated or dropped as part of the frame sync behavior. This feature will pass the entire
HANC and/or VANC region without modification except for very limited error correction to keep
the video stream within specification (values of 0x000 or 0x3FF will be clipped if not part of a
packet header, and EDH is re-generated).
To enable the card to pass through HANC or VANC
1. From the Device View in DashBoard, select the ANC tab.
ANC Tab
2. Toggle the HANC Pass Through and/or VANC Pass Through button(s) as outlined
in Table 9.14 on page 9-18.
3. If you selected Disabled , proceed to the section “ Specific ANC Processing ” on
page 5-4 to specify how the HANC and/or VANC data is processed.
Note
— If this feature is enabled, and the input format changes, there will be a
discontinuity that can cause errors such as the audio to click, audio CRC errors, or
closed captioning errors.
Operating Tip
— If you notice that the HANC or VANC is not passed after toggling
the HANC Pass Through or VANC Pass Through buttons to Enabled , verify that
the card input and output formats match.