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Cabin interphone calls
*
Passenger information signs.
The PA/CI controller gets chime data for passenger to attendant calls from the ZMUs on the intersystem bus.
The passenger address function of the PA/CI controller gets cabin interphone call chime data from the cabin interphone function of the PA/CI controller.
The passenger information sign chime data comes from different airplane systems.
Pause Signals
During all area announcements, the PA/CI controller sends a PA-all keyline to the IFE system. This system pauses the entertainment equipment for priority 1, 2A, and 2B all area announcements.
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PAS -OUTPUT INTERFACES
General
The passenger address/cabin interphone (PA/CI) controller gets all audio inputs. It selects the input with the highest priority and sends it to speaker drive modules (SDMs) and to the in-flight entertainment (IFE) system.
Speaker Drive Modules
There are three columns of SDMs in the cabin, one column for each zone. There can be as many as 25 SDMs in each column. Usually, each column has ten to thirteen SDMs.
The PA/CI controller selects the audio with the highest priority. The controller digitizes the audio and sends it to the SDMs.
The speaker drive module changes digital audio to analog audio. The PAS can have up to six passenger address (PA) areas. The SDM changes the audio for each speaker assigned to an area. Each SDM controls up to four speakers.
The PAS uses the token signal for software installation.
Ambient Noise Sensor
The ambient noise sensors (ANSs) monitor cabin noise levels. They send a signal in proportion to the measured noise level to a nearby SDM. The SDMs send the data to the PA/CI controller. The PA/CI controller uses the data to set volume levels.
There are three to five ANSs in each column.
In-flight Entertainment System
The in-flight entertainment (IFE) system sends passenger entertainment audio to the cabin. When a PA all area
announcement occurs, the PA/CI controller sends the PA
audio to the IFE system. The passengers hear the
announcement in their headphones.
The PA/CI controller has seven keylines to the IFE system, one for each PA area and one for a PA-all area announcement.
Pause Signals
During all area announcements, the PA/CI controller sends a pause signal to the prerecorded announcement machine (PRAM).
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PAS -AIRPLANE SYSTEMS AND CSMU INTERFACES
General
The passenger address/cabin interphone (PA/CI) controller has interfaces with different airplane systems and with the cabin system management unit (CSMU).
Airplane Systems
The PA function of the PA/CI controller receives inputs from these airplane systems on the left systems ARINC 629 bus:
*
ARINC signal gateway (ASG) card
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Proximity sensor electronics unit (PSEU)
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Overhead panel ARINC 629 system (OPAS)
*
Flap/slat electronics unit (FSEU)
*
Warning electronic system (WES)
*
Airplane information management system (AIMS)
*
Electrical load management system (ELMS).
The PA/CI controller uses these inputs to make chimes when the FASTEN SEAT BELTS and NO SMOKING signs go on or off. The PA/CI controller also uses airplane system data to adjust volume levels. The PA/CI controller uses flight data to set volume levels.
CSMU
There are two passenger address controllers in the PA/CI controller. They are normal and alternate. Only one controller operates at a time. If the normal controller fails, the crew selects the alternate controller at the attendant switch panel (ASP). The ASP sends a discrete to the cabin system management unit (CSMU). The CSMU sends a discrete to the PA/CI controller. The PA/CI controller then changes to the alternate PA controller.
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