Airplane Systems Interfaces
The PA/CI controller has interfaces with airplane systems on the left system ARINC 629 bus. The system interfaces are:
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Environmental control system (ECS)
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ARINC signal gateway (ASG) card
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Proximity sensor electronics unit (PSEU)
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Overhead panel ARINC 629 system (OPAS)
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Flap/slat electronics unit (FSEU)
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Electrical load management system (ELMS)
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Warning electronic system (WES)
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Airplane information management system (AIMS).
CDU, AMU, and FDH Interfaces
The flight crew uses the flight interphone system to talk on the passenger address system and cabin interphone system. The audio management unit (AMU) supplies the interface to the PA/ CI controller. The center control display unit (CDU) sends dial data and shows call information. The flight crew uses the flight deck handset (FDH) to talk.
AIMS Interfaces
The PA/CI controller sends call signals to the AIMS for these four conditions:
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Cabin call
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Cabin ready
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Cabin alert
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Ground call.
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CSS GENERAL -PASSENGER ADDRESS/CABIN INTERPHONE CONTROLLER INTERFACES
IFE System Interfaces
The in-flight entertainment system sends these signals to the passenger address/cabin interphone (PA/CI) controller:
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Boarding music
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Prerecorded announcements
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Video entertainment audio
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Video in use.
The IFE system also sends keylines to tell the PAC when an audio signal is present.
The PA/CI controller sends these signals to the IFE system:
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PA override audio
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PA override keylines
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Prerecorded announcement machine pause
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PA-All keyline
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Decompression.
Speaker Drive Module Interfaces
There are three columns of speaker drive modules (SDMs), one column for each zone. The PA/CI controller sends digitized passenger address audio to the SDMs. The data format uses the EIA-485 data standard. Another EIA-485 bus is for data between the SDMs and PA/CI controller.
The PA/CI controller sends a token signal during configuration database installation.
Zone Management Unit Interfaces
The PA/CI controller receives mic audio and a PTT signal from zone management unit (ZMU) 1 for the passenger address direct access input. It sends and receives digital audio for the cabin interphone system. The cabin interphone bus uses the EIA-485 data format. The passenger address controller and cabin interphone controller send these signals to each other. The cabin interphone controller gets attendant announcements and sends them to the passenger address controller.
The PA/CI controller also connects to the other ZMUs on the cabin interphone buses.
The PA/CI controller uses the intersystem bus between the CSMU and ZMU 1.
Panel Interfaces
The PA/CI controller sends a signal to the P310 standby power management panel for a ground crew call.
The P40 service and APU shutdown panel sends a signal to the PA/CI controller when the ground crew calls the flight deck.
The P30 external power and gatelink panel has two telephone jacks. They connect to the PA/CI controller.
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CSS GENERAL -PASSENGER ADDRESS/CABIN INTERPHONE CONTROLLER INTERFACES
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CSS GENERAL -ZONE MANAGEMENT UNIT 1 INTERFACES
General
The zone management unit (ZMU) controls the cabin components connected to it. It is also an interface between cabin components and other main controllers.
Passenger Address/Cabin Interphone Controller Interfaces
The bus interfaces between the passenger address/cabin interphone (PA/CI) controller and ZMU 1 are the intersystem bus and the cabin interphone bus. The intersystem bus supplies a data interface for primary CSS components. It uses a 10 base 2 data format. The cabin interphone bus is for the cabin interphone function. It uses an EIA-485 data format.
ZMU 1 sends analog audio and a PTT signal to the PA/CI controller for the passenger address direct access function.
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