AUDIO CONTROL LED/SWITCH MODULE
Control of audio functions are performed by operating switches on LED/Switch modules which are mounted on the
NDU Front Panel. The functions and quantity of the LED/Switch modules depend on the desired options and the
number of channels in the audio system. Labels are inserted into the slots on the LED/Switch modules to identify
the function of each switch and LED.
Standard switches on the Audio Control LED/Switch Module for Single and Triple Channel operations are three
position, momentary switches. Dual Channel systems normally use three-position maintained switches. An optional
Audio Control LED/Switch Module with three-position momentary switches is available for Dual Channel audio
systems.
VOICE MESSAGES
The NDU audio system is available with Voice Messages. These messages are selected at order entry to meet
customer requirements. The messages may contain various tones along with specified phrases which instruct
building occupants to behave in a manner appropriate to the abnormal conditions. An example of the Drill Message
follows:
“This is a drill. This is a drill. This is a drill. All occupants report to the nearest stairway exit
dloor,
and await further orders. Do not enter stairway.”
NOTE:
The above Drill Message will play three times. It may be followed by another Voice Message, or the operator
may elect to use the audio system microphone for additional announcements.
VOICE CODED DIGITS
Voice Coded Digits (0 through 14) are also available to support audio messages. These are spoken numbers which
identify a location or condition within the building. They are normally used in conjunction with Preambles.
PREAMBLES
Preambles for Voice Coded Messages are available with the NDU. These Preambles are specified at order entry
and are programmed into the system to meet customer requirements. An example of a Preamble with Voice Coded
digits is:
“Dr. Red, your assistance is required in area Three - One - Four.“
Other examples of Preambles are as follows:
l
“A Fire Emergency has been reported in area (voice coded digits).”
l
“Dr. Firestone, please dial (voice coded digits).”
l
“An emergency has been reported in area (voice coded digits).”
l
“Dr. Blaze, please dial (voice coded digits).
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