-
The Decoder/Encoder Units via the CIDS data busses,

 -
The Flight Attendant Panel (FAP).
 The connections to the equipment and other systems are realized with
 discrete, audio and data bus interfaces.

 (2)
 Architecture The director has the following modules and circuits:

 -Processing module
 -Bus interface circuits
 -Digital/analogue (audio) circuits
 -Discrete input/output circuits
 -Serial input/output (ARINC/Ethernet) circuits
 -Mandatory layout memory (non-volatile)
 -Cabin assignment data memory (non-volatile) and working memory (volatile)
 -Data transfer interface to second director
 -Smoke detection function module
 -BITE/WATCHDOG circuits
 -Power supply circuits

 (3)
 Functions

 (a)
 Processing module This module has supervisory functions, controls the CIDS data bus interface and all other interfaces. It can download software from the FAP. The director's BITE function is partly incorporated in the module.

 (b)
 Bus interface circuits The bus interface circuits do the synchronisation of the CIDS data bus, transmit data packets from the director and buffer all incoming data from the DEUs.

 (c)
 Digital/analogue (audio) circuits These circuits convert incoming audio signals to a digital format and convert these digital signals back to analogue audio signals for output.

 (d)
 Discrete input/output circuits These circuits convert discrete input levels to digital levels and these digital levels back to discrete output levels.

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 (e)
 Serial input/output (ARINC/Ethernet) circuits Serial interfaces support connection of conventionally connected terminals (e.g. FAP, SDAC, CFDS).

 (f)
 Mandatory layout memory (non-volatile) This memory stores mandatory cabin layout information. The On Board Replaceable Module (OBRM), which is located in the FAP, can modify this memory.

 (g)
 Cabin assignment data memory (non-volatile) This memory stores cabin assignment data and system properties information. This memory is modified through the Cabin Assignment Module (CAM), which is located in the FAP, or through programming on the FAP.

 (h)
 Data transfer interface to second director This interface provides facilities to transfer data and failure information between the two CIDS directors.

 (i)
 Smoke detection function module This module processes the control and indication functions of the smoke detectors in the cargo compartment.

 (j)
 BITE/WATCHDOG circuits The BITE circuits enable tests of the internal modules and inputs/outputs. The WATCHDOG circuits control the uninterrupted function of the processing module.

 (k)
 Power supply circuits These circuits provide the necessary electrical power.

 C. Decoder/Encoder Unit (DEU) type A
 (1) General The DEU type A provides an interface between the CIDS DATA BUS (top line) and different cabin systems. The information from the bus is transformed by the DEU type A into control signals which are sent to the respective cabin systems. The information from the cabin systems is transformed into data bus information and transmitted to the director. The DEUs type A are installed in the cabin. An interface is provided to this equipment:
 -Ballast units,
 -PISAs,
 -StA PISAs,
 -Reading Lights,
 -Seatrow identifier,
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 -Loudspeakers,
 -NS, FSB and RTS signs,
 (2)
 Architecture The DEU type A has the following modules and circuits:

 -Bus interface circuits,
 -Processing module,
 -System interface circuits,
 -Power supply circuits.

 (3)
 Functions

 (a)
 Bus interface circuits The bus interface buffers all incoming data bus information and sends selected data to the processing module. Data packets from the processing module and system interface are transmitted to the data bus.

 (b)
 Processing module This module decodes the data packets and activates the related outputs of the system interface. Inputs from the system interface are coded into data packets. Control commands and audio signals from the director are decoded and transmitted to the related connected equipment. The DEU BITE function is incorporated in the processing module.
　
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