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The figure below illustrates a typical emergency voice/alarm communications system:

Figure 4-1. Typical Emergency Voice/Alarm Communications System

While an emergency voice/alarm communications system is similar to a non-emergency paging

system, there are certain features that make emergency systems much more reliable than standard

paging systems:

• Backup Power Source (Batteries or Generator):

Allows the system to operate for as long as several days during a power failure.

• Dedicated Power Feed:

Isolates fire alarm power circuits from other branch circuits, preventing a fault from a

non-alarm circuit causing a fault at the fire alarm.

• Supervision of All Critical Signal Paths:

From the microphone through the last speaker in the system, all wiring is supervised for

shorts, opens, and Earth faults.

• Access Control:

Locked cabinet permits only authorized personnel to access to the system.

• Fixed Gain Controls:

The system is factory calibrated and sealed to prevent the user from tampering with the gain,

avoiding over-driving or under-driving the system.

• Local Mode Operation:

Alarm signals are available even if amplifiers lose communications with the command center.

A Typical Emergency Voice/Alarm Communications System

Advantages

Typical Emergency

Voice/Alarm

Communications

System

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