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System for testing NAC operability using backup power

  • US 20090009352A1
  • Filed: 07/05/2007
  • Published: 01/08/2009
  • Est. Priority Date: 11/18/2005
  • Status: Active Grant
First Claim
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1. A method for determining whether a notification appliance circuit has sufficient voltage to operate when powered by backup power, the method comprising:

  • determining impedance of the notification appliance circuit;

    determining, based on the impedance, a voltage drop across at least a part of the notification appliance circuit when powered by the backup power; and

    determining when powered by the backup power supply whether there is sufficient voltage to operate the notification appliance circuit based on the voltage drop.

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