M5.4

Question 1

Data buses: What are the disadvantages of point to point wiring

Answer 1

• Heavy wiring bundles
• Reliability problems

Question 2

Data buses: How was aircraft weight reduced

Answer 2

Serial point to point data buses

Question 3

Data buses: Serial point to point wiring requires how many wires

Answer 3

Two twisted pairs

Question 4

Data buses: What is a TDM

Answer 4

Time division multiplexing

Question 5

Data buses: What does TDM do

Answer 5

Used to sample input data sequentially

Question 6

Data buses: What is the name of the data buses we use

Answer 6

ARINC 429
ARINC 629

Question 7

Data buses: Define half-duplex

Answer 7

• One transmitter
• One receiver
• Both directions ( only one at a time)
  Limited bi directional

Question 8

Data buses: Define full duplex

Answer 8

• One transmitter
• One receiver
• Both directions at the same time

Question 9

Data buses: What is the transmitting LRU known as

Answer 9

Source

Question 10

Data buses: What is the receiving LRU known as

Answer 10

Sink

Question 11

Data buses: How many transmitters and receivers can a data bus have

Answer 11

One transmitter

20 receivers

Question 12

Data buses: How do you obtain bi-directional data transfer

Answer 12

Must use at least 2 ARINC 429

Question 13

Data buses: What are the advantages of serial transmission

Answer 13

Only a single line

Only one set of digital circuitry

Question 14

Data buses: What is the disadvantage of the serial transmission

Answer 14

Slower than parallel transmission

Question 15

Data buses: Where should shielded wires be grounded

Answer 15

Grounded at both ends

Question 16

Data buses: What wires are used for ARINC 429

Answer 16

A pair of twisted ARINC 429

Question 17

Data buses: What is ARINC 429 LS BUS speed

Answer 17

12-14 KBit/Second

Question 18

Data buses: What is ARINC 429 HS BUS speed

Answer 18

100KBit/Second

Question 19

Data buses: When can we have both LS and HS BUS speeds on ARINC 429

Answer 19

HS and LS transmission may never occur

Question 20

Data buses: What type of modulation does ARINC 429 use

Answer 20

Bipolar return to zero modulation

Question 21

Data buses: How many bits are in a ARINC 429 word

Answer 21

32 bits long

Question 22

Data buses: How are the ARINC 429 words separated

Answer 22

At least 4 bit times of null voltage

Question 23

Data buses: What is DCD-Data used for

Answer 23

Displays only

Question 24

Data buses: What us BIT 1-8 in a ARINC 429 word

Answer 24

Label or content

Question 25

Data buses: A typical ARINC 429 32 bit word contains what 5 parts

Answer 25

• Label
• Source/Destination identifier (SSM )
• Data Are
• Sign/Status matrix (SSM)
• Odd Parity Bit

Question 26

Data buses: What is not mandatory in a ARINC 429 word

Answer 26

SDI and SSM

Question 27

Data buses: What does the label do

Answer 27

Identifies the type of information contained in the word

Question 28

Data buses: What is always transmitted in the first 8-BIT of a ARINC 429 word

Answer 28

The label

Question 29

Data buses: What are the BITs 9 and 10 of a ARINC 429

Answer 29

SDI (Source/Destination Identifier)

Question 30

Data buses: What does a SDI do

Answer 30

Used to indicate the source of the information

Question 31

Data buses: What bits does the SSM take up

Answer 31

BNR 29 for sign 30 and 31
BCD - 30/31

Question 32

Data buses: what does the parity check

Answer 32

Ensuring BITS are correctly and completely transmitted

Question 33

Data buses: Does parity check for even or odd numbers

Answer 33

Odd

Question 34

Data buses: What BITS does the parity check, check?

Answer 34

BITs 1-31

Question 35

Data buses: How are ARINC 429 data buses tested

Answer 35

A special 429 test set

Question 36

Data buses: 629 has how many terminals

Answer 36

131

Question 37

Data buses: What is the data rate of 629

Answer 37

2Mbps

Question 38

Data buses: Benefit of ARINC 629

Answer 38

• Ability to move MORE DATA
• Higher rates
• Fewer wires

Question 39

Data buses: What does a 629 consist of

Answer 39

• Data bus cable
• Couplets
• Stub cables

Question 40

Data buses: What LRU components are in a 629

Answer 40

• Serial interface modules
• Terminal controllers

Question 41

Data buses: Can LRUs send and receive on the same bus in a ARINC 629

Answer 41

Yes bidirectional

Question 42

Data buses: What are stub cables used for

Answer 42

For bidirectional data movement between LRU and the current mode coupler

Question 43

Data buses: What is the 629 bus protocol

Answer 43

Each LRU has a time period in which it may transmit

Question 44

Data buses: 629 what is in between each message

Answer 44

Terminal gap

Question 45

Data buses: How many word strings does a MESSAGE have

Answer 45

31

Question 46

Data buses: A WORD string has up to how many data words

Answer 46

256

Question 47

Data buses: Basic Ethernet can transfer data at what speeds

Answer 47

Up to 10Mb/s

Question 48

Data buses: What occurs when a collision is detected

Answer 48

Both transmitters stop immediately

Question 49

Data buses: What components does switched Ethernet use

Answer 49

Routers and switches

Question 50

Data buses: What are the conditions of full duplex Ethernet

Answer 50

• Connecting mediums are capable of simultaneous transmission and reception
• 2 communicating computers have full duplex connection

Question 51

Data buses: Advantages of full duplex Ethernet systems?

Answer 51

• Bi directional transfer
• 100M/bits second
• Higher transfer rate
• Virtual link concept
• 1 transmitter and multiple receivers

Question 52

Data buses: How is redundancy created in ARINC 664

Answer 52

It has 2 network systems (A and B)

Question 53

Data buses: How does ACDN systems communicate to each other

Answer 53

Using AFDX switches and full duplex quad cables

Question 54

Data buses: How is the label coded in a ARINC 429 word

Answer 54

Octal coded