SECTION 7
NDU AUDIO SYSTEMS
GENERAL INFORMATION
The following paragraphs describe the features and general operating procedures of the 2500 NDU with Status
Command Center, Voice option.
INTRODUCTlCiN
This section covers the following topics:
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General Audio System information
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Single Channel Audio operation
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Dual Channel Audio operation
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Triple Channel Audio operation
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Phone operation
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Optional Feature operation.
Contact your local Simplex branch office to determine your audio configuration. Use the topics that apply
to your audio system.
AUDIO FEATURES
The NDU Voice Communications option provides automatic alert and evacuation messages over pre-programmed
speaker circuits during an alarm condition. Evacuation messages may also be manually initiated either to all areas
of a building or to specific areas within the building. The dedicated system microphone provides live voice message
delivery to any area within the building. Voice messages or voice codes can be created with the English language
(or a foreign language). Two-way communications are available with the Fire Fighter’s Phone System. The NDU’s
phone-to-audio interface enables the Master Phone or any remote Fire Fighter’s phone to be patched through the
audio system and operated as a microphone.
SYSTEM OPERATION
The NDU audio system is configured and programmed to meet individual customer and code requirements. Audio
systems are available as Single Channel, Dual Channel, and Triple Channel configurations. Single Channel systems
can output one tone or message at a time. Dual Channel systems can output two tones or messages simultaneously.
Triple Channel systems can output two tones or messages AND a talk output simultaneously. Signal routing and the
purpose of each channel depends on the number of audio channels in the NDU, as shown in Table 3.
Table 3
NDU Audio System Configurations
SINGLE CHANNEL DUAL CHANNEL
TRIPLE CHANNEL
CHANNEL 1 = EVAC
CHANNEL 1 = EVAC
CHANNEL 1 = EVAC
CHANNEL 1 = ALERT
CHANNEL 2 = ALERT
CHANNEL 2 = ALERT
CHANNEL 1 = TALK
CHANNEL 2 = TALK
CHANNEL 3 = TALK
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