Grass Valley 8995DNC v.1.3.0 - Manual (Page 52)

52 8995UPC/DNC/UDX — Instruction Manual
Configuration
Output Timing
Select the Primary and Secondary output timing source for the module as
either
Local (external reference from the 8900GEN-SM submodule mounted
on this module), Ref Bus 1 (8900GEN-SM submodule is mounted on module
in slot 1 and jumpered for outputting a Ref 1 frame bus), Ref Bus 2
(8900GEN-SM submodule is mounted on module in slot 3 and jumpered
for outputting a Ref 2 frame bus), or
Input , the reference is taken from the
input video. The signal and genlock status of each reference source will be
reported in the Status and Genlock columns.
When a Secondary reference source is selected and different than the Pri-
mary, the module can be configured to switch automatically to the Sec-
ondary selected if the Primary is lost or becomes unlocked or invalid. If you
do not want this action of switching to a secondary, set the Primary and Sec-
ondary sources to the same source.
Note An 8995 module can switch between the REF1 and REF2 sources from dif-
ferent genlock submodules that are locked to the same reference signal, and
maintain stable output video genlock.
Reference Restore
If the Primary source has failed and a Secondary source is selected and
valid, the following controls allow you to set the module to switch back to
the Primary automatically or manually and determine the amount of time
before the Primary is restored.
• Switch to Primary – set this control to Manual if you wish to manually
return to the Primary reference when it becomes valid or locked again
or
Auto to allow the module to switch back to the Primary reference.
• Reference Switchback Delay – when the control above is set for Auto , set the
amount of time to allow between switching from the Secondary refer-
ence back to the restored Primary. The switchback time has a minimum
recovery time of 30 seconds to assure that the Primary is locked and
valid before the module switches back to this source.
Primary – Secondary Phase Difference
This graphic is provided to show the total phase difference between the
Primary and Secondary references. When the bar is green and remains in
the area before the horizontal indicator, the two references are in a range
where switching between the two will show no measurable disturbance in
the output video (approximately 72 ns).
When the phase difference is larger than the recommended amount, the bar
will indicate a second red bar. This indicates that the phase difference is
now such that switching between the two references will show a distur-
bance in the output video. This can be caused by a loss of one of the refer-
ences or a mis-adjustment in the reference output delay of either reference.
The total phase error shown in this graphic represents approximately 1 us.