ASCB and ARINC429

Question 1

What is the difference between Rz and NRz?

Answer 1

Return to Zero always returns to the null point (0V)

Question 2

How much of the pulse width does Rz use to determine a logic high or logic low?

Answer 2

Only HALF the pulse width

Question 3

Between RZ and NRZ which is less noisy, but is slower?

Answer 3

NRZ

Question 4

PAM, PWM, and PPM are all what?

Answer 4

Pulse Coded Modulation

Question 5

What does GAMA stand for?

Answer 5

General Aviation Manufacturers Association

Question 6

What does ARINC stand for?

Answer 6

Aeronautical Radio Incorporated

Question 7

What is the purpose of GAMA and ARINC?

Answer 7

Sets standards for Data bus systems

Question 8

What does ASCB?

Answer 8

Avionics Standard Communication Bus

Question 9

What type of wire do we use for data bussing?

Answer 9

Shielded double copper wire AWG 24

Question 10

What must you do to Polarity Sensitive Busses?

Answer 10

Ground both ends of shield cable and never switch the wires

Question 11

How would you measure the digital signal?

Answer 11

Use the oscilloscope and analyzer

Question 12

What type of bus is ASCB and at what frequency does it operate at?

Answer 12

BIDIRECTIONAL and operates at 0.667MHz

Question 13

How many controllers and parallel busses does it have?

Answer 13

3 controllers and 2 parallel busses

Question 14

What is the purpose of the extra controllers?

Answer 14

Redundancy

Question 15

Is ASCB RZ or NRZ?

Answer 15

NRZ

Question 16

In an ASCB, how do you check for errors?`

Answer 16

Use the scope/analyzer and the info Tx before and after the data is used for error checking

Question 17

What is the fastest and slowest times for data request on an ASCB?

Answer 17

40Hz and 5Hz

Question 18

What is the request/answer time known as?

Answer 18

Bus Frames

Question 19

The total time allowed for a given frame bust be ______ than the update period

Answer 19

LESS

Question 20

If one Tx fails, what happens to the other busses?

Answer 20

Everything functions normally

Question 21

What is the maximum STUB length?

Answer 21

36inches/3ft

Question 22

What is the maximum BUS length?

Answer 22

150ft

Question 23

What is the maximum resistance/impedance on the wire?

Answer 23

1`25ohms

Question 24

The ASCB LRUs are connected/coupled using what?

Answer 24

Transformer Coupling

Question 25

Wire terminations must be how much?

Answer 25

127ohms

Question 26

What is the purpose of ARINC429

Answer 26

Increased accuracy, decreased weight

Question 27

ARINC429 is what type of bus?

Answer 27

oneway/unidirectional/simplex

Question 28

What is DITS?

Answer 28

Digital Information Transfer System

Question 29

How many bits in a ARINC429 word?

Answer 29

32bits

Question 30

In ARINC429, each word is separated by what and how long is it?

Answer 30

separated by a null that is 4bits long

Question 31

What is the purpose of the Null?

Answer 31

Timing and Synchronizing

Question 32

ARINC429, is it NRZ or RZ?

Answer 32

Rz = Self Clockiing

Question 33

What is transmit voltage on an ARINC429?

Answer 33

+-10

Question 34

ARINC429 is what type of format?

Answer 34

Bipolar Format, signal reverses polarity

Question 35

How many Tx and Rx can the ARINC429 have?

Answer 35

1Tx 20Rx

Question 36

What are the 2 speeds of ARINC429?

Answer 36

12kb/s and 100kb/s

Question 37

What are the 4 Data Word Formats for ARINC429?

Answer 37

Binary, BCD, AIM, Discrete

Question 38

Bits 1-8 of the word is what?

Answer 38

Label, type of info

Question 39

Source Destination Indicator is which bits what is its purpose?

Answer 39

9-10, signal to which Rx

Question 40

Bits 11-29 is what?

Answer 40

Data

Question 41

What is a pad bit?

Answer 41

To fill in the gaps in the data (binary 0)

Question 42

What is the sign status matrix?

Answer 42

Identifies parameters

Question 43

Bit 32 is what?

Answer 43

Parity Bit, Odd, for error checking.

Question 44

Which bits are Equipment Ids in?

Answer 44

1-8