Data bus architecture

Question 1

How can sample accuracy be improved?

Answer 1

Increase sample size
Bigger binary number

Question 2

What are the advantages of data bus?

Answer 2

Lighter and more cost effective
wider design scope
can be upgraded and modified

Question 3

Transmission technique of the MIL STD 1553B

Answer 3

Half duplex

Question 4

Number of remote terminals on the MIL STD 1553B

Answer 4

31

Question 5

Transmission media on the MIL STD 1553B

Answer 5

Shielded twisted pair of copper cable

Question 6

Number of bits in a data word in the MIL STD 1553B

Answer 6

16 bits of actual data

Question 7

Number of remote terminals in the 1553B

Answer 7

31 remote terminals

Question 8

What’s the encoding standard on the MIL STD 1553B

Answer 8

Manchester 2 bi phase encoding

Question 9

Explain the term redundancy?

Answer 9

Concept of having a back up Bus controller if one fails

Question 9

Advantages of multiplex systems?

Answer 9

Less wires
Less cost
Less weight
can be modified and upgraded

Question 10

How can accuracy be improved?

Answer 10

using a bigger binary
more samples

Question 11

How is noise minimised?

Answer 11

By inversing signals on shielded twisted conductors and measuring the potential difference between both conductors, the effect of electrical noise is reduced.

Question 12

What are the 2 methods of redundancy

Answer 12

Using a back up bus controller
Back up cables

Question 13

Which aircraft is Arinc 429 found?

Answer 13

Used on Civillian air frames in the military

Question 14

What’s the clock speed of Arinc 429?

Answer 14

12.5 kbits/s

Question 15

Word length of Arinc 429

Answer 15

32 bit word length

Question 16

How many remote terminals does Arinc 429 have?

Answer 16

20

Question 17

Transmission technique of Arinc 429?

Answer 17

Simplex

Question 18

Which data bus uses fibre optic cable?

Answer 18

EFA Bus

Question 19

2 Types of coupling

Answer 19

Direct
transformer coupling

Question 20

Stub wiring length of transformer coupling

Answer 20

0-6m
(THERE IS FAULT ISOLATION)

Question 21

Stub wiring length of Direct coupling

Answer 21

0-0.3m
(THERE IS NOT FAULT ISOLATION)

Question 22

2 Types of test equipment?

Answer 22

Data bus network tester
Data bus analyser

Question 24

Characteristics of ARINC 429

Answer 24

Found on Civi aircraft

Clock speed = 12.5 - 100 kbit/s

Word length - 32bits

Remote terminals - 20

Transmission technique - Simplex

Question 25

EFA Bus

Answer 25

- Uses fibre optic cable - 20 Mbit/s clock speed

Question 26

Purpose of the executive programme?

Answer 26

Monitor and control all data transfers on the data bu s and initiate error detection tasks

Question 27

Explain broadcast mode

Answer 27

When the bus controller addresses all remote terminals at the same time

Question 28

Explain grouped transfer?

Answer 28

When more than 1 data word is transferred at the same time

Question 29

What are the components on the 1553B that reduce data corruption and what are there values?

Answer 29

Terminating resistors - (70-85 ohms)

Question 30

explain the meaning of analogue signal?

Answer 30

Infinite levels, changes continously

Question 31

explain digital signals?`

Answer 31

only 2 levels does not change continously