Typical Addressable Fire Alarm System Architecture with Building Interfaces

A functional architecture of addressable signaling line loops (Class A, Style 6) feeding a fire alarm control unit, Class B notification appliance circuits with end-of-line resistors, NAC power supplies, supervising station communication over Ethernet with cellular, radio or POTS backup, annunciators, power supervision, and relay and monitor interfaces to sprinklers, elevators, HVAC, dampers, access control and emergency power.