Product manual

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.