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General Description
Description, Installation, Operations, and Maintenance Manual
Federal Signal www.fedsig.com
The system has field equipment, including:
•
Loudspeakers:
Convert the electrical audio signal from the amplifiers into a
corresponding sound.
•
Beacons and Status Lamps:
Supplement audio broadcasts in areas of high ambient
noise with visual signaling.
•
Access Panels and Microphone Stations:
Include microphones and push-button
controls.
Redundancy is one of the techniques employed to ensure the robustness of a system,
allowing it to perform its functions in the event of component or subsystem failure.
Redundancy relies on three features:
• The provision of duplicated subsystems, components, and interconnections
• The ability to detect the failure of the above
• The ability to re-route control and audio signals in response to such a failure
Figure 1 System Architecture
