5.4 Data Buses NEW Flashcards

1
Q

Wiring utilized to transmit data caries only a negligible current, just sufficient to do what?

A

Switch a transistor ON or OFF or to carry an audio signal which is then amplified at its destination.

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2
Q

What voltage levels are required for Binary 0?

A

0 to 0.8V

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3
Q

What voltage levels are required for Binary 1?

A

2 to 5 Volts

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4
Q

What are the 2 ways of data transfer between systems?

A

Parallel data transfer and Serial data transfer.

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5
Q

In serial transfer the data is transferred over?

A

The same line in sequence.

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6
Q

What triggers the transfer of data?

A

Clock pulses

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7
Q

What is the typical method of speeding up s serial data bus?

A

Multiplexing

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8
Q

In parallel transfer each bit is taken from?

A

A separate circuit and is transmitted over a separate line.

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9
Q

What are the advantages of parallel transfer and Disadvantages.

A

Much faster. Disadvantage = much more hardware, more space and weight.

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10
Q

What are the benefits of multiplexing?

A

Significant reduction in weight of wires and improved circuit reliability.

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11
Q

How does multiplexing operate?

A

Via synchronized rotating contacts connecting matching input and output lines in sequence. Data transmitted over the common transmission line.

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12
Q

In reality multiplexing is usually achieved by?

A

Logic gates responding in sequence to clock pulse signals.

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13
Q

What is the purpose of the shielding on the twisted wire pair?

A

Spike protection, eliminates EMF, guarantee’s accurate transmissions

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14
Q

What is the purpose of the twisted wire?

A

Magnetic fields induced by the currents flowing through them will cancel each out out, eliminating EMI

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15
Q

All peripheral components are connected to the highway by?

A

Breakouts (Couplers)

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16
Q

MIL-STD-1553 defines the term Tim division multiplexing as?

A

Transmission of information from several signal sources through the same line with different signal samples in time to form a composite pulse train.

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17
Q

Q. What are the the 3 MIL-STD-1553 Data words?

A

Command words, Data Words, Status Words

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18
Q

What is the length of word for a MIL-STD-1553

A

20 bits in length.

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19
Q

Q. Define Odd parity

A

Odd parity means there is always an odd number of 1’s in a word.

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20
Q

Data may travel in one way or in two directions what is this called?

A

Signal can only travel in 1 Direction = Simplex, 2 ways = Duplex

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21
Q

What are the first 3 bits of a MIL-STD-1553 word.

A

Sync

22
Q

Bit encoding for the MIL-STD-1553 is based on what format?

A

Bi-Phase Manchester 2

23
Q

Define half duplex

A

When data transmits and receives over the one line but has to wait for its turn for each direction.

24
Q

What is the transmission technique of the MIL-STD-1553?

A

Half-Duplex

25
Q

Maximum number of terminals on a MIL-STD-1553?

A

31

26
Q

Transmission media for the MIL-STD-1553?

A

Twisted shielded pair.

27
Q

MIL-STD-1773 contains information for?

A

Fibre optic cabling.

28
Q

What does ARINC stand for?

A

Aeronautical radio inc.

29
Q

ARINC 429 bit encoding?

A

Bipolar return to zero (RTZ)

30
Q

ARINC 429 Word size?

A

32 bits

31
Q

What are the characteristics of the ARINC 429?

A
  1. Data bus using two signal wires
  2. Word size of 32 bits
  3. Bit encoding with bipolar return to zero.
  4. Simplex data bus.
32
Q

What system does this schematic belong to?

A

MILD-STD-1553

33
Q

What system does this schematic belong to? and what does the arrow indicate?

A

ARINC 429, Arrow indicates simplex

34
Q

Which graph does this represent?

A

Return to Zero, No signal is transmitted at the Zero

35
Q

What is included in a ARINC 429 Word?

A

Label, SDI, DATA, SSM, Parity

36
Q

What does the SSM portion of a ARINC 429 word determine?

A

Validity of the data and a failure warning.

37
Q

What are the first 8 bits of the ARINC 429 word?

A

LABEL

38
Q

Label codes of a word are typically represented as?

A

Octal Numbers

39
Q

What is within the LRU of the ARINC 629

A

Terminal Controller and Serial Interface Module (SIM)

40
Q

The stub cable is coupled to the global data bus via what on the ARINC 629

A

Current mode coupler

41
Q

The ARINC 629 data bus system includes what parts?

A

Data bus cable, Current mode couplers, Stub cables.

42
Q

Stub cables are used for?

A

Bi-directional data movement between LRU and current mode coupler.

43
Q

The bus cable on a ARINC 629 is?

A

A pair of twisted wires with a termination resistor at each end.

44
Q

What is the message structure of the ARINC 629 system?

A

Message has upto 31 word strings, 4 bit time gap.

45
Q

Explain the word string of the ARINC 629 system.

A

Begins with a LABEL and has up to 256 data words.

46
Q

The ARINC 629 uses a time procedure to prevent accidental mixture, what are the 3 timers?

A

Transmit interval, Synchronization Gap, Terminal Gap.

47
Q

Q. The 3 timers of the ARINC 629 system operate in what 2 ways?

A

Periodic (Standard Mode) or Aperiodic (Abnormal Events Mode)

48
Q

Which data bus system uses current coupling as the transmission mode?

A

ARINC 629

49
Q

Number of terminals on the ARINC 629 system

A

120

50
Q

What is the order from slowest to fastest of the Data bus systems?

A

1553 1MBps = Slowest
429 = Middle
629 = 2Mbps = Fastest

51
Q

What is the bus architecture of the ARINC 429?

A

Simplex point to point.