Subsection 04 Data Buses Flashcards
A bus which supports the transfer of data in both directions is referred to as?
Bidirectional
A current mode coupler contains an E-core assembly, the purpose of the E-core is?
To couple the signal to the data bus
A data frame on an ethernet system contains?
Both source and destination addresses
A deterministic ADN used on a certified integrated modular avionic system must have a BIT error rate ( BER) of no more than?
1 in 10 to the -12
A group of BITS transmitted at the same time is?
Parallel data
A signal in an ARINC-629 system uses?
A twisted pair of wires or fibre optics
A simplex system has?
1 transmitter and multiple recievers
A simplex system has 1 transmitter and ?
Many recievers
A terminal controller will transmit?
Only once during each transmit interval
A virtual link in an ADCN is?
Unidirectional
An active AFDX subscriber, connected to an AFDX network to communicate with other subscribers respecting AFDX rules is called?
An end system
An aircraft databus system can use both ARINC-629 and ARINC-429 via?
System card files and signal gateways
An ARINC-429 BCD word occupies BITS 11-29, if 11-15 are filled with padders then the LSB of the word will be?
16
An ARINC 429 binary coded decimal (BCD) word occupies word bits?
11-29 (BCD is 11-29 BINARY is 11-28)
ARINC-429 bus uses?
A twisted shielded pair of wires
An ARINC-429 system uses a 32 word over?
A twisted pair of wires
ARINC 429 word label format is?
OCTAL
ARINC 573 data buses are used to input a?
DFDR
ARINC 629 bus cable is a twisted pair of wires with?
A 130 ohm resistor at each end
ARINC 629 characteristics is that data can transmit?
In both directions down the data bus
ARINC 629 data word has?
Only 20 BITS
ARINC 629 Label word is?
12 BITS
An ARINC 629 LRU can?
Transmit and receive on one data bus
An ARINC 629 stub cable connects bi-directional data between?
The LRU and the current mode coupler
An ARINC data word is BITS 11-29, if BITS 11-18 are patched which of the following would be the LSB BIT?
19
An avionics data communications network (ADCN) uses ?
Two active parallel identical networks
An in-series ARINC 429 system transmits using?
Time division multiplexing
ARINC 429 data bus systems use?
Binary coded decimal BCD
ARINC 429 has low BIT rate of?
80 milliseconds
ARINC 429 is?
SIMPLEX
ARINC 429 is a?
Single source multiple sink system
ARINC 429 null state is represented by a voltage of?
0v
ARINC 429 SDI word format is at BITS?
9-10 ( source destination ident )
ARINC 429 slow speed transmission is?
80 microseconds
ARINC 573 is related to the?
FDR system
ARINC 629 current mode couplers are?
INDUCTIVE
ARINC 629 databus cables are terminated using?
130ohm resistors
ARINC 629 is
One bus, bi directional flow
ARINC 629 is two cables..
Bi-directional
ARINC 629 is transmitted using?
Fibre optics or twisted wire pair
ARINC 629 is used for?
Normal flight
ARINC 629 is
Half duplex data bus
ARINC 629 LRU’s transmit when?
Terminal gap is sensed
ARINC 629 periodic mode is used for?
Normal operation
ARINC 629 runs at a Baud rate of?
2000 kband
ARINC 629 terminal transmit interval is?
Common to each terminal
ARINC 629 Aperiodic mode is used for?
Database loads
Avionics full duplex switched ethernet (AFDX) utilises?
Commercial off the shelf hardware
AFDX data rates are?
10-100 Mpbps
AFDX is?
Full duplex
AFDX uses a ?
Star topology network
AFDX uses ?
Copper or fibre optic TX medium
Can an LRU TX and RX on more than one 629 bus?
YES
Care must be taken when installing ARINC 629 into bus panels, damage to cables can cause?
Corrosion of the conductor
Communication between an aircraft computer and display symbol generator would use a?
Serial bus architecture
Data is transferred on the MIL-STD-1553B by?
Manchester Bi-Phase
Deterministic performance of an ethernet system used for an integrated modular avionic system network is provided by the use of ?
Virtual links within the ethernet network system
Fibreoptic databus links are?
Bi-Directional
How are communications controlled on a MIL-STD-1553 databus?
Terminals only output data when commanded to do so by the bus controller
How are engine indications sent to the FDR?
ARINC-573
ARINC 629 transmit and receive information by?
Inductive coupling
How does MIL-STD-1553 put data onto the buses?
Through a databus controller
How is ARINC 429 bi-directional data transfer achieved?
By using two data buses
How is data coupled to an ARINC-629 bus?
By inductive pickup
How is data transmitted on an ARINC 429 bus?
Asynchronous and serial
How is the word label 206 written in ARINC 429?
OCTAL 01100001
How many LRU’s can be connected to an ARINC 429 bus?
20
How many voltage levels does ARINC 429 have?
3
If an ARINC system uses ODD BIT parity then the binary number 101000111 would be given a parity BIT of?
0
In aircraft use fibre optic cables should comply with?
ARINC 636 standard
ARINC 429 digital data word, the source/destination identifier is made up of two BITS positioned at?
9-10
ARINC 429 Digital word BIT 32 is used for checking?
Parity
ARINC word label representing heading 320 this is represented in BITS 1-8 as?
00001011
In an ARINC 429 word what data occupies BITS 9 and 10?
SDI ( source destination identifier )
ARINC 429 wordstring bits 1-8 represent the?
Monitored parameter
ARINC 429 data field is BITS 11-28, if bits 11-18 had pad bits the LSB of the data word would be?
19
ARINC 629 aperiodic mode, LRU’s transmit in order of?
Shortest to longest terminal gap
In ARINC 629 LRU’s are programmed to transmit?
One at a time
ARINC 429 digital information transfer system, data may travel in?
One direction only
Manchester II encodes Logic 1 with a voltage transition from?
A high to low state
MIL-STD-1533 is a data bus for?
Digital information transfer syatem
MIL-STD-1533B uses Manchester bi-phase encoding which makes it suitable for?
Transformer coupling
Normal transmission order of ARINC 629 LRU’s in periodic is in the order of?
Power up
On an ARINC 629 bus the max amount of current mode couplers per data bus is?
120
On ethernet EMI can cause?
Jitter
One of ARINC 429 formats is?
BCD
Parity BIT for data checking ARINC 429 is on the?
LEFT
Reliability of data transmission via AFDX is guaranteed by the use of?
Virtual links
RZ bi polar modulation consists of BIT’s which are?
One of three states
Terminal gap in ARINC 629 is changed by adjusting the?
RX/TX software
ARINC 429 data bus word systems use?
Binary coded decimal
ARINC 429 data word is?
32 BITS long
The ARINC 429 low rate transmission is 12-14 Kbits/second with a high of
100 kbits/second
ARINC 429 Low speed data bus transfers data at a rate of?
12Khz
The ARINC 429 standard uses?
ODD parity checking
ARINC 429 uses which of the following systems to transfer data?
Bi-Polar return to zero
ARINC 629 synchronisation gap (SG) is a time period to all users where each transmitter must wait for the SG to elapse before?
Making a second transmission
The BCD data field of ARINC 429 is contained within BIT’s ?
11-29
The data format used to transmit a signal to the FDR is?
Harvard bi-phase 12 bit
Defined standard for deterministic data transfer in a network for safety critical IMA applications is?
ARINC 664
General arrangement of ARINC 629 includes?
Data bus cable, current mode coupler and stub cable
The Maximum data rate supported by the FDDI bus is?
100Mbps
Max data rate supported by MIL-STD-1553 is?
1 Mbps
Max number of terminals connecting to a MIL-STD-1553B is
31
The most significant BIT of ARINC 429 word is to the?
Left
The number of LRU’s which TX/RX on ARINC 429 is dependant upon?
Parallel input impedance
The output voltage of ARINC 429 signal is?
+10v to -10v
The parity BIT in digital information is used to?
Check the validity of data information
The technology used in an integrated modular avionics system to provide the standard of ADCN is called?
AFDX
The TX/RX of ARINC 629 is?
Multiplex/demultiplex
ARINC 429 low speed data bus transfers data at a rate of approx.?
12 khz
To connect an LRU to an ARINC 629 data bus a?
Current mode coupler, serial interface module and terminal controller is required.
To create a Bi-directional COMS link within a ARINC 429 system?
Two data buses are required
What are the 3 types of words in the MIL-STD-1553B?
Bus command, Status and Data
What connects an LRU to the bus coupler in an ARINC 629 bus?
A stub cable
What is a parity BIT used for on an ARINC 429 bus?
Fault/Self check
What is ARINC 561 used for?
Inertial navigation systems
What is ARINC 561 used for?
To specify inertial nav data bus
What is the encoding method used in ARINC 429?
Bi polar RZ
What is the highest speed of ARINC 429?
100Kbps
What is the lower rate “ BIT TIME “ for ARINC 429?
80 Microseconds
What is the parity bit for on ARINC 429?
Checks for corruption during transmission of a word
The purpose of intermediate production breaks on ARINC 429/629 cables is to?
Allow maintenance personnel to divide LH and RH buses for easy removal/installation
What is the purpose of parity bit on ARINC 429?
To indicate to the Receiver that the data is valid
The slowest speed for ARINC 429 is?
12.5Kbps
What is used in an ARINC 429 word to check for correctness of sent data?
PARITY BIT
What limits the number of ARINC 429 receivers on a bus?
The parallel input impedance
What system uses base 8?
ARINC 429
Where is the Parity bit installed in a data word?
the END MSB
Where is the PASS and FAIL of an ARINC 429 code indicated?
SSM field
Why does ARINC databuses send data to LRU’s in series?
Saves weight
