CIDS

Question 1

what is task of CIDS

Answer 1

control all functions possuibly relevant to cabin and its operatinos

Question 2

how is cids sold

Answer 2

seller furnished equipment

Question 3

wher is aircraft layout stored

Answer 3

CAM (cabin assignment modle

Question 4

what are fundamental components

Answer 4

director
top line and middle line
DEUs
FAP
equipment

Question 5

what are components of CIDS director

Answer 5

mainboard (connection)
SDF board (dal b)
CPU board (distinct CPUs for DAL c and D -> hardware segregation) (sequencer for data lines)
IO board 
Audio processing board (DSP)

Question 6

how is DSF board different

Answer 6

-own board, own IO, own power supply, own data busses, AFDX interface

Question 7

CPU board functions

Answer 7

sgregations dal c and d processing units
FPGA for sequencing (suffering and sorting/addressing packets)
ethernet network interconnectino for panel network
MP3 decoder

Question 8

what does the IO board contain

Answer 8

IO signal processing for arinc 429, Can, discree, analog

-electrical power supply

Question 9

what does audio board ontain?

Answer 9

-DSP
ADC
DAC

Question 10

what is redudancy concept (in a380)

Answer 10

triplex, master-slave, Hot standby.

keep SDF function as long as possible

Question 11

how does MP fap differ from simple fap

Answer 11

MP fap can access several domains (with hard toggle swith)

Question 12

what are three main slots for memory for?

Answer 12

• OBRM (contains OS for director for bootup)
• CAM (cabin assignment module)
• IPRAM (prerecorded announcements and boarding music)

Question 13

how are FAPS connected

Answer 13

panel network -> ethernet.

MiniFAPs are daisy chained. Can be crosslinked to have redundant communication

Question 14

how does data flow on top line

Answer 14

through topline from CIDS dir (FPGA sequencer on CPU board)
to DEU (max 16) (based on address of connection Box from Coding switch.
to 1/64 ports via a FIFIO stack.

Question 15

what connects DEU A to related euipment?

Answer 15

-LVDS (low voltage differential signalling) data buses -> to pax units (PISA, LAILA. STA PISA) (PISA + passenger interface supply apdapter
-RS 485 data buses to ilumination equipment (IBU, STELLA, SALSA)
28V essential supply

Question 16

what interfaces does the DEU B have (other than middle line)

Answer 16

LVDS (handsets)
28V signaling
RS 232 data buses (EPSU [for BTIE], Additional attendant Panel)
CAN bus (smoke detection, trolley lift, galley control)
analog temp sensors

Question 17

how are calls priprotized

Answer 17

by type of communication for PA and Phone) and source

Question 18

advantages of CIDS data protocal

Answer 18

• simultaneous reaching destinatino of data (no jitter)
• deterministic
• can use standard ethernet transmitters and receivers (cheaper)
• passive connection box (compared to ethernet switch) which is more reliable
• lighter (daisy chaning has less needed wiring/ equip)

Question 19

what are some CIDS functions

Answer 19

-PA
-crew interphone
-service interphone
-temp sensing setting for aircon
-emergency signal
-crew signalling (sterile cockpit, areas ready)
-doors and slides indication
-illumination
-passenger call
galley cooling
-waste / water indication
-prerecorded boarding music
-smoke detection