Nevion FRS-HD-CHO - Manual (Page 16)

FRS-HD-CHO Rev. 9
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Manual selection mode
Figure 7: Gyda view of input 1 selected in manual mode.
Automatic selection mode
Figure 8: Gyda view of the input selection
If in Gyda the video in mode choice is set to auto, three input choices can be made for three
priorities; electrical 1, electrical 2 or mute/generator
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. When signal is missing on one priority,
the change-over will switch to the next priority and look for signal. If only two priorities are
needed, i.e. one main and a fallback, the third priority can be disabled by setting it to
„–„.
Note that the ASI-CHO-2x1-PB product version does not have the Video gen.
and Mute choices. Because no version of the FRS-HD-CHO has a built-in ASI
generator, no fallback is available when using ASI input signals. This is also true
for the FRS-HD-CHO-ASI; Even though the Video gen. and Mute choices are
available regardless of the selected mode (SDI or ASI), no actual fallback will be
available for lost ASI sources.
Hold time and lock time controls how long a signal can be missing before the next priority is
used, and how long a signal has to be present before it is considered to be OK again. This
modu
le is always latching, which means that is doesn‟t switch from a fallback back to the
main input unless it is either ordered to do so (the latch reset button), or if the fallback signal
also disappears.
Triggers
In addition to the loss of signal and lock detect, there are a set of triggers that can force the
switching to next priority. Equal types of triggers are grouped together in a trigger block. A
trigger block consists of a switching enable signal, a trigger selection mask, a Boolean
operator, a hold time and a threshold.
The trigger block always report status of all triggers inside the trigger block.
The switching enable signal (enable/disable radio button) enables the trigger to do a switch
between the inputs after detecting a continuously present error over a hold time.
The trigger selection mask selects which detections are enabled to do switching.
The Boolean operator is either “and” or “or”. It controls whether the switching should be
based on either (or) or all (and) of the selected triggers in the trigger selection mask.
The trigger to switch time is the time that a trigger must be continuously present before a
switching of the inputs will happen.
Level is number to set a threshold for a content check. The format of the levels will differ
between trigger blocks. Not all trigger blocks have a threshold.
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The processed video out block selects whether the output goes to mute or generator at loss of signal