Design and Construction Handbook - Los Angeles World Airports

Guide Specification
2. Following interruption of service, power restoration shall be automatically sequenced in a
minimum of two stages - processing equipment followed by amplification equipment.
3. There shall be no loss of operating configuration information and operator intervention
shall not be required in order to restore system operation.
P. Digital record/playback system (DRP):
1. The DRP shall be designed so it can be installed in the ACS as an integral part of the
whole system.
2. The DRP shall have at least 8 separate channels and each channel shall be able to record
at least 600 seconds of audio. When a microphone station zone group selection button is
momentarily pressed the following functions shall be performed:
PAGING SYSTEMS
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a. The microprocessor shall detect the action.
b. The system shall find an open DRP channel.
c. The ‘READY’ LED indicator shall illuminate on the microphone station.
d. The DRP channel shall be assigned, and the announcement from the microphone
station shall be stored. The announcement time duration shall be preset to 50
seconds.
e. The green LED associated with that button shall start to flash 8 seconds before the
preset announcement limit.
f. The announcement shall be retained for playback when the microphone or
announce button is released. The microphone or announce button must be released
prior to the preset announcement limit or prior to any 5 second silent period.
3. The announcement will play back automatically, to the selected zones, in its assigned
queue position.
4. An announcement shall be canceled when a microphone or announce button is pressed
and held for a 5 second silent period. Cancellation shall be indicated by the green light
going off.
5. The red ‘BUSY’ LED’s beside the zone group select buttons on the microphone station
shall light when all DRPS channels are busy.
6. The microphone station shall be able to select a desired zone group when all DRPS
channels are busy. The ‘BUSY’ LED will flash acknowledging acceptance of the station
into the queue (first-in, first-out). When the station reaches the top of the queue, the
station beeper will sound and the green ‘READY’ LED will turn on and the microphone
station can proceed with its announcement recording.
Q. Permanent digital record/ playback system (PDRP):
Communication Systems