Directed Electronics VIPER 5701 - Manual (Page 43)

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Nuisance prevention® circuitry
Your system has Directed’s Nuisance Prevention® Circuitry (NPC). It
prevents annoying repetitive trigger sequences due to faulty door pin
switches or environmental conditions such as thunder, jackhammers,
airport noise, etc.
For example: If the alarm triggers three times within a 60-minute
period and each time the same sensor or switch triggers the alarm, NPC
will interpret those triggers as false alarms. After the third trigger, NPC
ignores, or bypasses, that sensor or switch (along with any other sen-
sors or switches sharing the same zone) for 60 minutes.
If the bypassed sensor tries to trigger the security system while it
is being bypassed, the 60-minute bypass period will start over. This
ensures that a sensor that is continually being triggered will remain
bypassed.
The vehicle doors are protected by NPC differently. If your security
system is triggered by an open door for three full cycles, the system
will bypass the doors until the trigger ceases.