DE285 HD Caption Decoder/VANC Monitor
Alarm Name
Description
Video Frame Error
Sets an alarm that goes off when there is an
error involving the video signal.
Caption Error
Sets an alarm that goes off when a caption
error is detected. A complete list of caption
errors can be found after this table.
XDS Error
Sets an alarm that goes off when there is an
error involving the Extended Data Services
packets.
VANC on Illegal Line
Sets an alarm that goes off when there is an
error involving VANC on a different line than
what’s depicted in the SMPTE specification
Invalid
ANC
Packet
Checksum
Sets an alarm that goes off when an invalid
ANC packet checksum is detected.
The following table lists each Caption Error and provides a short de-
scription.
Caption Error
Description
CDP header not found
The body of a VANC packet did not begin with
0x96 0x69, which marks the start of a CDP.
CDP footer not found
The CDP footer section wasn’t found. Since
the footer includes the checksum, the de-
coder will not process such packets.
CDP sections out of or-
der
The CDP should contain the following sec-
tions, in this order: a header, an optional
timecode section, an optional caption data
section, an optional caption service info sec-
tion, and a footer. If one or more of those was
out of order, you’ll see this message.
CDP
sequence
mis-
match
The CDP header contains a 16-bit sequence
counter which should increment by one each
frame. If you see this, the sequence numbers
jumped between two VANC packets.
CDP header/footer se-
quence mismatch
The CDP footer contains a copy of the header
sequence counter; in this case, they were not
identical.
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All rights reserved.
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