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NOTE: This is an unformatted excerpt from our online fire protection training library.

Auxiliary Fire Alarm Systems

Coded Radio Systems

Type A

Due to the volume of traffic expected on a Type A system, two separate receiving networksEach network includes an antenna, a radio frequency receiver, signal processing equipment, time/date alarm printer, audible alerting device, and a power supply. are required for each frequency used. Obviously, the use of redundant equipment increases the reliability of the system. Both receiving networks have to be installed at the public receiving station. Should one fail, it cannot affect the other.

If a polling systemMost of the radio frequency systems are one-way radio, so the signal is transmitted from the protected premises to the public alarm receiving station, and there is no return "loop" as there is in a wired system. Thus, there has to be a "hand shake" between the public alarm receiving station and the transmission equipment at the protected facility. is installed into the receiving network, the polling devicesTypically, polling is done on a 24-hour basis. have to be separate for each system.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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