Derived alarms and controls are one of the most powerful features of T/Mon SLIM. Derived alarms are "virtual" alarms created through user-defined formulas that coordinate inputs from several alarm points and apply logical operators to them. One classic example of a derived alarm is the combination of a low battery AND a broken generator. Either condition isn't only a Major alarm by itself, but in combination they are a Critical alarm.
The value of derived alarms is that they provide a way for you to watch for alarm combination scenarios. You don't have to scan your monitoring screens to figure out what's happening with your network. If you've configured your derived alarms, you've told the T/Mon SLIM what to watch for, and it will keep track of your alarms for you.
And with a derived alarm formula keeping track of critical events, you don't have to worry that your staff will miss the significance of a cascade of alarms - the T/Mon SLIM will alert the staff to the true situation, and even give them detailed instructions on who to inform and what to do next.
Consider a scenario of what might happen with our example of the bad generator AND the bad battery if you did not have derived alarms. Tom, on the morning shift, receives the alarm that the generator isn't functional, acknowledges it, makes a note to schedule repairs, and goes to lunch. Marcia, on the afternoon shift, comes on duty and neglects to read the trouble log. She notes that the battery is low, sends a command to start the generator, and forgets to check whether the battery is recharged. That night, commercial power fails, there is no backup power, the site goes dark, and the network goes down.
Derived alarms are flexible enough to monitor and control nearly any aspect of your network. Our clients have devised many ingenious derived alarm applications that can give you better visibility of your network. Here are just four of the ways you can use derived alarms to get better visibility of your networks. If you're not using them, you should try them.
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