Nevion FRS-3G-DUAL - Manual (Page 18)

FRS-3G-DUAL Rev. B
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This may look like a very complex to do the input selection, and in some ways that is
correct. When there is only one physical input the number of useful combinations is rather
small:
Electrical → ‘-’ Video output will freeze for as long as the electrical input is missing. No
fallback.
If at any time the input is again locked for a duration of Lock time, the
module will again un-freeze the picture.
Electrical → Mute Video will freeze for Hold time after the electrical input disappears, then
the output will be muted, i.e. the output drivers are turned off.
If at any time the input is again locked for a duration of Lock time, the
module will again select the electrical input and turn the output drivers
back on.
Electrical → Generator
Video will freeze for Hold time after the electrical input disappears, then
the output will switch to an internal generator. The generator pattern (Black
or Color bar) is selected in the Video generator block, but the video format
will always be the same as last seen by the module.
If at any time the input is again locked for a duration of Lock time, the
module will again switch from generator to the electrical input.
Generator → ‘-‘ This forces the output to use one of the internal generators. Both the
pattern (Black or Color bar) and the video format are selected in the Video
generator block.
Mute → ‘-‘
This forces the output to Mute, i.e. the output drivers are turned off.
Combinations like Generator
→ Mute will be reduced to Generator → ‘-‘ in the reply from
the module, because the internal generators are always present, and hence the Backup1
setting is irrelevant. Likewise Electrical
→ Electrical will be reduced to Electrical → ‘-‘ ,
because it doesn’t make sense to have an input as its own fallback.
3.2.4 Video generator
Figure 7: Multicon GYDA view of video generator and the possible selections therein
The video generator block work in conjunction with the input selector, and together they
decide how the module behaves when the input signal is lost. See the previous chapter.
Note that the Video format selection only comes into play when the module is used as a
standalone generator. In normal operation the video format will be taken from the last legal
input seen by the module.