Belden Miranda DENSITE 3+ FR1, Руководство пользователя

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REF-1801-FR1 Frame Reference
Input tab
To select the reference source for this REF-1801-FR1
Use the pulldown to select the reference source:
• Auto – Use the external reference if available; switch to the internal reference if the
external reference is lost or unavailable.
• External – use the reference connected to the rear panel
• Internal – use the internal reference source
To select the time code source for this REF-1801-FR1
Use the Timecode Source pulldown to select the source of timecode that will be inserted in
the outgoing reference signals from this REF-1801-FR1. The choices are:
• Auto – Use LTC if available, if not, VITC.
• VITC – Extract timecode from the reference input
• LTC – Use the timecode connected to the LTC input on the rear panel.
• OFF – Do not insert timecode into the output URS signal.
To select the timecode processing mode
Use the Timecode Processing pulldown to select how the timecode is processed in the
REF-1801-FR1:
• Normal – use the timecode selected by the Timecode Source pulldown as the output
timecode source.
• Pass through – pass the timecode selected by the Timecode Source pulldown directly
to the output without internal processing.
The Pass through mode is required for correct operation when the time code is not
standard running time code, e.g. when it is counting down. Using this mode will result
in a 1-frame delay in the time code as it passes through the REF-1801-FR1. When pass
through mode is selected, no new input timecode alarms (frame error, phase error) will
be flagged.
The current status of timecode available at the REF-1801-FR1 input is shown in the LTC
Status and VITC Status areas:
Indication Meaning
Valid V
alid time code detected at the input.
Phase error SMPTE-12 specifies the phase relation between LTC and video. If
the LTC received does not match this alignment window, the card
will flag this error.
Frame error The time code must match the input reference frame rate. If not,
an error is flagged.
Absent No time code detected at the input.
Note: The error detection algorithm uses the current reference
format. So, when using internal reference, all information
extracted from the input is out of phase, and the card may flag
errors even if there are none.