HD490 AFD Software
XDS
This field sets the number of frames that the HD490 will continue out-
putting an AFD code from an upstream XDS source without seeing any
new upstream XDS packets. This feature is critical for use of the XDS
recovery feature because XDS cannot be sent on every frame due to
Line 21 bandwidth limitations. The hold delay will need to be set to
100 frames or more in many environments. This does create a switch-
ing latency between the time when the last XDS AFD packet appears
in a stream and the time when that code is replaced in the output sig-
nal by data from a preset or VANC (if XDS Priority over VANC is set).
Therefore, the hold delay should be set to the lowest value that gives
continuous operation in your environment.
3.2.4 Preset Default
AFD Code
This field selects the AFD code that will be inserted statically when no
other source of AFD data is recovered. The text below the selection box
gives the definition of the selected code.
3.2.5 Status
The status section auto-refreshes approximately once every 2 seconds
to provide up-to-date information about the unit.
Current Source
This field reports the source of the AFD code that is currently being
encoded to the output video signal. You will see one of PRESET, XDS,
VANC, TCP (network automation), GPI, TRANSPARENT, or STRIP. If you
see TRANSPARENT in the current source window, it means that the
upstream VANC is passing through completely unchanged. If you see
STRIP in the current source window, it means that upstream VANC is
being removed and nothing is being inserted in its place.
AFD
This field reports the AFD code that is currently being encoded to the
output video signal.
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