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OPERATION
Controls and Indicators
Siemens Industry, Inc.
Building Technologies Division
•
Visually indicated input channel prioritization control logic based on audio
activity and fault detection.
•
Audio path supervision for both channels, reported visually by LEDs and to
the system by the AIC audio input supervision circuitry.
•
All-analog circuitry makes the ALCC completely transparent to the overlying
system structure.
The ALCC provides the capability of conducting a global emergency page across
multiple remote XLS/Desigo Fire Safety Modular/Cerberus PRO Modular nodes, up to
63 nodes per audio riser. The emergency page originates at an XLS/Desigo Fire
Safety Modular/Cerberus PRO Modular or MXL global paging station, where it is
broadcast at 70VRMS over an audio riser by a ZAC-40 (XLS/Desigo Fire Safety
Modular/Cerberus PRO Modular) or ZAC-30 (MXL) amplifier. A single remote XLS/
Desigo Fire Safety Modular/Cerberus PRO Modular node contains one ALCC, which
steps the incoming speaker-level audio down to line-level audio that is compatible
with the AIC audio input (0.775VMRS, independently adjustable to ±6dBu). The AIC
digitizes the audio, which is subsequently transmitted by a DAC-NET to local
amplifier(s) for broadcast over the local speaker zones. The ALCC incorporates two
independent audio channels and is therefore capable of supporting two global paging
stations. In case of a simultaneous page, the ALCC control logic prioritizes the
primary channel over the secondary channel. On-board audio detection circuitry
monitors the audio risers for incoming audio, while supervision circuitry reports any
issues with the audio path via front-accessible LEDs, and, if necessary, disconnects
its output from the AIC input, causing a trouble to be reported to the system. The
ALCC relies on the originating amplifier for supervision of the audio risers, and on the
AIC for supervision of the connection to the ALCC. Since the AIC monitors the
presence of signal on its audio input, it is responsible for reporting audio path faults
to the XLS/Desigo Fire Safety Modular/Cerberus PRO Modular system.
The ALCC contains no digital circuitry and integrates seamlessly into the existing
XLS/Desigo Fire Safety Modular/Cerberus PRO Modular framework, as it is com-
pletely transparent to the overlying system structure.
Refer to the ALCC Usage Restrictions on page 8.
The following table contains a description of LED indicators visible through the front
bezel of the ALCC:
L
E
D
C
O
L
O
R
N
O
T
P
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W
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R
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C
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A
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P
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A
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T
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P/N 315-050263-3
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