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General Description
Description, Installation, Operations, and Maintenance Manual
Federal Signal www.fedsig.com
2.5.7 Amplifier Audio Mux Card (P-AAMC-G)
The Amplifier Audio Multiplexer card (P-AAMC-G) provides an interface to connect
a System Controller to its associated Amplifiers. (See Figure 7.) In addition, the
P-AAMC-G provides the interface needed to connect two System Controllers to form
N+1 redundant PAGASYS GEN II system.
The P-AAMC-G provides eight buffered Analog to Digital Converter (ADC) channels
to digitize incoming analog input audio for subsequent DSP audio processing. The eight
audio inputs include six audio inputs received through the A/B connection from another
System Controller, one audio input from the local microphone preamplifier located on the
Miscellaneous (P-CMC-G) card, and one audio input from the Private Automatic Branch
Exchange (PABX) interface on the Miscellaneous card.
The P-AAMC-G provides an audio Digital-to-Analog Converter (DAC), which provides
14 buffered analog output channels that are routed to the following circuits:
• Six Audio inputs of local Amplifier Chassis
• Six Audio inputs of another System Controller through the A/B connection
• Controller Chassis audio auxiliary output
• Controller Chassis audio PABX interface
The System Controller A/B connection supported by this card includes a full-duplex
RS485 interface and six bidirectional analog audio paths. When the local System
Controller is in a failure state, the P-AAMC-G enters a Fallback state that enables
audio signals connected to the local audio amplifiers to be supplied by a second System
Controller through the A/B connection.
The P-AAMC-G also includes the Fireman’s interface for the System Controller.
During normal operation, the Fireman’s microphone audio is routed to the Access Panel
Mux card in slot 1, where it can be digitized (P-IAMC-G or P-EAMC-G). When the
P-AAMC-G card is in a Fallback state and the fireman’s microphone PTT signal is
active, the audio signals connected to all the local audio amplifiers are supplied from the
fireman’s microphone rather than the second System Controller.
NOTE
: The service model for the Amplifier Audio Mux card is K-P-AAMC-G.
