Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

ATAV 504: Data Bus Systems > ARINC629 > Flashcards

ARINC629 Flashcards

1
Q

What is the maximum amount of Rx/Tx the 629 bus will allow?

A

120 Tx/Rx

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What type of serial data bus is the ARINC629?

A

Bi-directional/Duplex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What type of wires can the ARINC629 be and how long are they?

A

Can be 100m twister copper

Unlimited length fiber optic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the speed of the ARINC629?

A

2MB/s

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the improvement of ARINC629 from 429?

A

Less weight and high speeds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Can you transmit on more than one LRU at a time for the ARINC629?

A

No, can transmit only one at a time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How many bus control units does the ARINC629 have?

A

It does not have any bus control units

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How many data busses do you need for 2 way communications?

A

Only one data bus for 2 way communication

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What type of coupling does the ARINC629 use and what are its advantages?

A

No physical interruption
less loose connections
improved reliability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the initial data produced by the LRU and in what format?

A

A digital signal in the Manchester format

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When the doublet changes from a binary 1 to 0 and vice versa, what does it produce?

A

It produces a short pulse(bumps)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How does the clock pulse react on the 629 and what is its purpose?

A

Becomes opposite of the current binary high/low and is for synching

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Why is the Receiver voltage lower than the transmit voltage?

A

For system losses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the benefits of using fiber optic cable?

A

immune to EMI and lighting transients

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the copper wire impedance?

A

130ohms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the purpose of the timing signal in each bit?

A

Self clocking

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

How long is each bit?

A

100uS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

This component moves data to and from the LRU memory, what is it?

A

Terminal Controller

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is the purpose of the serial interface module?

A
  • Connects TC to data bus STUB
  • Changes Manchester current to analog voltage doublet
  • informs TC of system failure
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

How many wires/cables does the stub have?

A

4 (2Rx, 2Tx)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is the max length of the stub?

A

75ft

22
Q

What is the purpose of the stub cable?

A

Connects TC to CMC

23
Q

What is the CMC and what is its purpose?

A

It is the current mode coupler and its to get the LRU to the 629 bus using a transformer coupler

24
Q

How many inductive couplers in one unit and what is the purpose?

A

2 inductive couplers in one unit

one for redundancy

25
Q

In transmit, the CMC does what?

A

Changes v doublet to current doublet

26
Q

Current doublet to V doublet is changed where?

A

Receiver CMC

27
Q

Each message has what?

A

31 word strings

4bit sync gap ident

28
Q

How many data words in 1 word string?

A

256 data words

starts with label then data words

29
Q

The Label word has how many bits and what are they?

A

20bits

  • 12 label
  • 1 parity
  • 4 label extension
  • 3 sync pulse
30
Q

The Data word has how many bits and what are they?

A

20 bits

  • 16 data
  • 1 parity
  • 3 sync
31
Q

What is the purpose of the PPSSP and PSSP?

A

Syncing at beginning of each word

32
Q

The 629 bus is also referred to as?

A

Periodic, Aperiodic multi-tx bus

33
Q

What are the 3 timing signals used to sequence the transmission of the 629?

A

Terminal Gap
Synch Gap
Transmit Interval

34
Q

Which is longer than the longest TG?

A

Synch Gap

35
Q

What is the purpose of the TG?

A

determines the priority of transmission for LRUs

36
Q

What does a short TG mean?

A

High priority

37
Q

What is the purpose of the Synch Gap?

A

acts as a reset signal

- LRU can only tx once until next SG

38
Q

What is the purpose of the TI?

A

prevents any one user from dominating the bus

39
Q

What is a periodic bus?

A

All tx completed within TI completion

40
Q

If the TI is exceeded due to an LRU tx longer than average message, what is the mode now?

A

Aperiodic

41
Q

What does an impedance change signify?

A

A faulty bus

42
Q

If you pass the ohmeter test but still fail to transmit the signal what is the issue?

A

High impedance

43
Q

What are the 3 ways transmission of digital data can be affected by the data bus system?

A

Drop Outs
Attenuation
Interference

44
Q

When a portion or portions of the signal are lost during tx what is it being affected by?

A

Drop Outs

45
Q

What is Drop Outs caused by?

A

Loose Connections

Intermittent Signals

46
Q

What does attenuation do?

A

makes signal weak or tx V too low that receiver does not recognize

47
Q

How does attenuation happen?

A

Loss of power due to resistance, dbm, db

48
Q

How do you solve attenuation?

A

LRU isolation

LRU inductive coupling

49
Q

What is it called when unwanted signals are induced into the bus?

A

Interference

50
Q

What causes interference?

A

Improper shielding

Leaks

ATAV 504: Data Bus Systems (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions