Final answer:
A Fire Alarm Signal System is a device that sends alarm signals to the fire department through an FDNY approved central station, and is part of emergency communication systems improved by the Public Safety and Homeland Security Bureau for use during crises.
Step-by-step explanation:
A Fire Alarm Signal System is a device that receives alarm signals from protected premises and retransmits those signals to the Fire Department's Bureau of Fire Communication through an FDNY approved central station. This system is crucial for ensuring safety and efficient communication in the event of a fire. It's an essential component of emergency communication systems like the ones developed by the Public Safety and Homeland Security Bureau, which improves communication for emergencies and crises. After events like Hurricane Katrina, the importance of reliable communication systems has become very apparent, ensuring that public safety, health, defense, and emergency personnel, along with consumers, can communicate effectively during times of greatest need.