M5.4 Flashcards
Data buses: What are the disadvantages of point to point wiring
- Heavy wiring bundles
- Reliability problems
Data buses: How was aircraft weight reduced
Serial point to point data buses
Data buses: Serial point to point wiring requires how many wires
Two twisted pairs
Data buses: What is a TDM
Time division multiplexing
Data buses: What does TDM do
Used to sample input data sequentially
Data buses: What is the name of the data buses we use
ARINC 429
ARINC 629
Data buses: Define half-duplex
- One transmitter
- One receiver
- Both directions ( only one at a time)
Limited bi directional
Data buses: Define full duplex
- One transmitter
- One receiver
- Both directions at the same time
Data buses: What is the transmitting LRU known as
Source
Data buses: What is the receiving LRU known as
Sink
Data buses: How many transmitters and receivers can a data bus have
One transmitter
20 receivers
Data buses: How do you obtain bi-directional data transfer
Must use at least 2 ARINC 429
Data buses: What are the advantages of serial transmission
Only a single line
Only one set of digital circuitry
Data buses: What is the disadvantage of the serial transmission
Slower than parallel transmission
Data buses: Where should shielded wires be grounded
Grounded at both ends
Data buses: What wires are used for ARINC 429
A pair of twisted ARINC 429
Data buses: What is ARINC 429 LS BUS speed
12-14 KBit/Second
Data buses: What is ARINC 429 HS BUS speed
100KBit/Second
Data buses: When can we have both LS and HS BUS speeds on ARINC 429
HS and LS transmission may never occur
Data buses: What type of modulation does ARINC 429 use
Bipolar return to zero modulation
Data buses: How many bits are in a ARINC 429 word
32 bits long
Data buses: How are the ARINC 429 words separated
At least 4 bit times of null voltage
Data buses: What is DCD-Data used for
Displays only
Data buses: What us BIT 1-8 in a ARINC 429 word
Label or content
Data buses: A typical ARINC 429 32 bit word contains what 5 parts
- Label
- Source/Destination identifier (SSM )
- Data Are
- Sign/Status matrix (SSM)
- Odd Parity Bit
Data buses: What is not mandatory in a ARINC 429 word
SDI and SSM
Data buses: What does the label do
Identifies the type of information contained in the word
Data buses: What is always transmitted in the first 8-BIT of a ARINC 429 word
The label
Data buses: What are the BITs 9 and 10 of a ARINC 429
SDI (Source/Destination Identifier)
Data buses: What does a SDI do
Used to indicate the source of the information
Data buses: What bits does the SSM take up
BNR 29 for sign 30 and 31
BCD - 30/31
Data buses: what does the parity check
Ensuring BITS are correctly and completely transmitted
Data buses: Does parity check for even or odd numbers
Odd
Data buses: What BITS does the parity check, check?
BITs 1-31
Data buses: How are ARINC 429 data buses tested
A special 429 test set
Data buses: 629 has how many terminals
131
Data buses: What is the data rate of 629
2Mbps
Data buses: Benefit of ARINC 629
- Ability to move MORE DATA
- Higher rates
- Fewer wires
Data buses: What does a 629 consist of
- Data bus cable
- Couplets
- Stub cables
Data buses: What LRU components are in a 629
- Serial interface modules
- Terminal controllers
Data buses: Can LRUs send and receive on the same bus in a ARINC 629
Yes bidirectional
Data buses: What are stub cables used for
For bidirectional data movement between LRU and the current mode coupler
Data buses: What is the 629 bus protocol
Each LRU has a time period in which it may transmit
Data buses: 629 what is in between each message
Terminal gap
Data buses: How many word strings does a MESSAGE have
31
Data buses: A WORD string has up to how many data words
256
Data buses: Basic Ethernet can transfer data at what speeds
Up to 10Mb/s
Data buses: What occurs when a collision is detected
Both transmitters stop immediately
Data buses: What components does switched Ethernet use
Routers and switches
Data buses: What are the conditions of full duplex Ethernet
- Connecting mediums are capable of simultaneous transmission and reception
- 2 communicating computers have full duplex connection
Data buses: Advantages of full duplex Ethernet systems?
- Bi directional transfer
- 100M/bits second
- Higher transfer rate
- Virtual link concept
- 1 transmitter and multiple receivers
Data buses: How is redundancy created in ARINC 664
It has 2 network systems (A and B)
Data buses: How does ACDN systems communicate to each other
Using AFDX switches and full duplex quad cables
Data buses: How is the label coded in a ARINC 429 word
Octal coded
