(c)
System interface circuits The system interface adapts to the physical properties of the connected cabin systems.
(d)
Power supply circuits This unit provides all necessary power to the DEU circuits and to the outputs.
D. Passenger Interface and Supply Adapter (PISA)
(1) General The PISA is the interface between the DEU type A and components of the Passenger Service Unit (PSU). The PISAs are installed in each PSU in the pressurised area of the cabin. The PISA has interfaces to the following equipment:
-Reading-light switches and reading lights, R - Passenger call button and passenger call lights,
-Seatrow identifier,
-Loudspeakers,
-NS, FSB and RTS signs,
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(2)
Architecture
The PISA has two boards:
-Main board,
-Audio board.
(3)
Functions
(a)
Main board The main board can operate independently. It contains the functions for:
-
Reading light control,
-
Reading light switch monitoring,
-PAX call button monitoring and seat row indication. The main board also receives the necessary power for both boards and all outputs.
(b)
Audio board The audio board can only operate with the main board. It contains the functions for audio output and control of the NS, FSB and RTS signs.
E. Stand Alone Passenger Interface and Supply Adapter (StA PISA)
(1) General The StA PISA is the interface between the DEU type A and the equipment/ indications installed near the cabin attendant stations fwd and aft.
The StA PISA has interfaces to:
-
Attendant work light switches,
-
Attendant work lights,
-NS, FSB and RTS signs.
For further information refer to 33-27-00.
F. Decoder/Encoder Unit (DEU) type B
(1) General The DEU type B provides an interface between the CIDS DATA BUS (middle line) and certain attendant related systems. The information from the bus is transformed by the DEU type B into control signals which are sent to the respective attendant systems. The information from the attendant systems is transformed into data bus information and transmitted to the director. The DEUs type B are installed in the pressurised area of the cabin.
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An interface is provided to the following equipment:
-Additional Attendant Panel (AAP),
-Attendant Indication Panel (AIP),
-Area Call Panels (ACP),
-Handsets,
-Slide and door pressure sensors,
-Emergency Power Supply Unit (EPSU),
-Drain Mast Control Unit (DMCU),
-Smoke sensors,
-Prime Level Indicator (Precharge),
-Waste and water service panel,
-Fan phase off relay,
-
Liquid Level Sensor (LLS),
-
Liquid Level Transmitter (LLT),
-Vacuum generator,
-Flush Control Unit (FCU),
-Vacuum power control relay,
**ON A/C 301-399,
An interface is provided to the following equipment:
-Additional Attendant Panel (AAP),
-Attendant Indication Panel (AIP),
-Area Call Panels (ACP),
-Handsets,
-Slide and door pressure sensors,
-Emergency Power Supply Unit (EPSU),
-Drain Mast Control Unit (DMCU),
-Smoke sensors, R - Evac/Smoke reset panel,
-Waste and water service panel,
-Fan phase off relay,
-
Liquid Level Sensor (LLS),
-
Liquid Level Transmitter (LLT),
-Vacuum generator,
-Flush Control Unit (FCU),
-Vacuum power control relay,
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(2)
Architecture The DEU type B consists of the following modules and circuits:
-Bus interface circuits,
-Processing module,
-System interface circuits,
-Power supply circuits.
(3)
Functions The functions of the different components are the same as described for the DEU type A.
G. Flight Attendant Panel (FAP)
(1)
General The FAP enables the cabin crew to control certain cabin systems and CIDS, to indicate the status of several cabin systems and to provide cabin programming. It can also be used to emulate CFDS reports when the aircraft is in the ground status. The FAP is installed in the pressurised area of the cabin.
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