Nevion ADP-3GHD - Manual (Page 14)

ADP-3GHD Rev. A
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Figure 12 - Video error trigger settings
There is one trigger for each analyzer. Since there are triggers for both the main and standby
input, an error condition on main input doesn't necessarily mean the change-over will switch,
but for simplicity the following description assumes that the standby channel is always
"good".
Each trigger has an adjustable time control, called "hold time". This is used for three
situations:
a) a) Multiple bursts of error within timer duration triggers a switching to standby.
b) b) Single continuous error condition whose duration exceeds timer triggers a
switching to standby.
c) c) Error free periods, whose duration exceeds timer, triggers a switching back to
main.
The trigger also has a setting for "bit operator". It is possible to do a logical AND on the bits
after applying the mask. Set to AND, all the individual error types that have been enabled
must be occurring to count as an error condition. Set to OR, any enabled error type will
suffice.