Grass Valley iControl V.6.02 - Manual (Page 359)

iControl
User Guide
349
For a more detailed description of the difference among these three options, refer
to
"Understanding the Alarm Logic Tables" on page 310
4. Select the alarms that are to be sub-alarms of the new virtual alarm, and then click the large
down arrow button to transfer them to the table in the bottom half of the window.
The alarm hierarchy displayed in the Build virtual alarm window is the same as the one in
the GSM Alarm Browser.
5. The table displays various details about the sub-alarms you have selected, including their
Contribution, which defines how a sub-alarm will pass its status on to the virtual alarm. The
default contribution value is Passthrough, which means the sub-alarm will pass its status
unaltered to the overall calculation of the virtual alarm.
It is possible to override the error status of sub-alarms when they are triggered. This is useful
when, for example, a device is only able to report a status of either normal (green) or error
(red), but you want the error condition to be reflected as a warning (yellow) in the virtual
alarm. To change a sub-alarm’s contribution, click in the Contribution column, and then
select the status you want the virtual alarm to use when an error occurs.