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The type B Decoder Encoder Units (DEUs) are located
in the left-hand and right-hand sides close to the
cabin ceiling.
Each type B DEU connects to a middle line data bus.
Each data bus uses a two wire twisted and shielded
cable.
FUNCTIONS
Each type B DEU interfaces with the following
components and systems:
- Aft Attendant Panel,
- Emergency Power Supply Unit,
- Slide pressure monitoring,
- Passenger Address/Interphone handset,
- Attendant Indication Panel,
- Area Call Panels,
- Drain Mast Heating Monitoring.
MIDDLE LINE DATA BUS
One middle line data bus on each side of the passenger
cabin connects the type B DEUs to the Directors.
A bus termination resistor is located on the last
DEU B mount of each line for impedance matching.
CODING SWITCHES
A coding switch in the DEU mount gives each DEU a
unique address. This method enables replacement of
DEUs without selecting their address.
NOTE: In the event of mount change it is necessary to
select the same code as used before on the coding
switch.
CIDS POWER UP
When the CIDS is powered up or reset, the Director
follows a power up routine. This includes the
initialization and testing of each DEU and connected
equipment.
The test results are transmitted to the Director which
compares them with its programmed Data to decide on
their status.
At least 95% of possible DEU failures are automatically
detected.
EMERGENCY FUNCTIONS
All DEUs operate in emergency mode when the DC service
bus is no longer powered. The DEUs are then supplied
from the DC essential bus.
The type A DEU Passenger Address circuits and type B
DEU interphone circuits remain operational.
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CIDS - TYPE B DEU DESCRIPTION/OPERATION
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23 - COMMUNICATIONS
23-73-00 CIDS - DEU MOUNTS
DESCRIPTION/OPERATION
CONTENTS:
DEU Mounts
TMUCI2H03 LEVEL 3
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CIDS - DEU MOUNTS DESCRIPTION/OPERATION
DEU MOUNTS
The mounts for type A and type B DEUs are basically
the same. Due to index pins it is not possible to
install a type A DEU on a type B DEU mount.
The mounts for the type A DEUs have the index pins on
the outer side of the slot and the type B DEUs on the
inner side of the slot.
On each DEU mount there are Address Coding Switches.
In case of a mount change the old code must be selected.
A Bus termination resistor is installed on the last
DEU mount of each line, for impedance matching.
NOTE: A table giving the address code is placed close
to the mount.
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CIDS - DEU MOUNTS DESCRIPTION/OPERATION
EFFECTIVITY 23-73-00 Page 3
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23 - COMMUNICATIONS
23-73-12 FORWARD ATTENDANT PANEL
PRESENTATION
CONTENTS:
General
Air Conditioning
Cabin Lighting
Audio Panel
Water and Miscellaneous Panel
TMUCI2J03 LEVEL 1
EFFECTIVITY 23-73-12 Page 1
Dec 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
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