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C - The DEUs are no longer supplied.
If the self-test of director 1 fails:
A - Director 1 is switched to emergency mode.
B - The top line data buses are switched off.
C - Director 2 takes over automatically.
TMUCI2E03 LEVEL 1
EFFECTIVITY 23-73-00 Page 8
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
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23 - COMMUNICATIONS
23-73-00 CIDS - TYPE A DEU
DESCRIPTION/OPERATION
CONTENTS:
General
Functions
Top Line Data Bus
Coding Switches
CIDS Power Up
Fail Safe Operation
Emergency Functions
Self Examination
TMUCI2F02 LEVEL 3
EFFECTIVITY 23-73-00 Page 1
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 215
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CIDS - TYPE A DEU DESCRIPTION/OPERATION
GENERAL
The type A Decoder-Encoder Unit (DEUs) are located in
the left-hand and right-hand sides above the cabin
windows in the ceiling. Each type A DEU is connected
to a CIDS top line data bus. Each data bus uses a two
wire twisted and shielded cable.
FUNCTIONS
Each type A DEU interfaces with :
- three Passenger Service Units (PSUs)
- two loudspeakers
- four fluorescent strip lights which are part
of the cabin light system.
TOP LINE DATA BUS
Two top line data buses on each side of the passenger
cabin connect the type A DEUs to the directors.
A bus termination resistor is located on the last DEU A
mount of each line for impedance matching.
A broken top line can affect no more than half of the
DEUs installed on one cabin side.
CODING SWITCHES
A coding switch on each 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.
FAIL SAFE OPERATION
In the event of a data bus failure the DEU maintains
the current status of the discrete cabin systems output
for a certain time.
After this delay the outputs are switched to a
pre-defined fail safe state, that means the four
fluorescent strip lights come on at full brightness
and all other items go off.
All audio input/outputs are immediately switched off.
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.
TMUCI2F02-T01 LEVEL 3
EFFECTIVITY 23-73-00 Page 2
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 216
ALL
TMUCI2F02-P01 LEVEL 3
CIDS - TYPE A DEU DESCRIPTION/OPERATION
EFFECTIVITY 23-73-00 Page 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 217
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SELF EXAMINATION
Where are the coding switches located?
A - On the front of each DEU.
B - On each DEU mount.
C - Only on the last DEU mount of each line.
What are the type A DEUs connected to?
A - To the top line data bus.
B - To the mid line data bus.
C - To an ARINC 429 data link.
TMUCI2F02 LEVEL 3
EFFECTIVITY 23-73-00 Page 4
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 218
ALL
23 - COMMUNICATIONS
23-73-00 CIDS - TYPE B DEU
DESCRIPTION/OPERATION
CONTENTS:
General
Functions
Middle Line Data Bus
Coding Switches
CIDS Power Up
Emergency Functions
TMUCI2G03 LEVEL 3
EFFECTIVITY 23-73-00 Page 1
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 219
ALL
CIDS - TYPE B DEU DESCRIPTION/OPERATION
GENERAL
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