Digital Techniques in Aviation - Bi-Phase Waveform
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Questions and Answers

What is the primary function of the Remote Terminal to Remote Terminal (RT-RT) command?

  • To transfer data through the Bus Controller (BC)
  • To enable direct data transfer between two terminals (correct)
  • To validate data before transmission
  • To synchronize command words between terminals

    • What action does the receiving terminal take after receiving a command synchronisation word?

  • Processes the command without delay
  • Sends a request back to the transmitting terminal
  • Transmits its status word immediately
  • Ignores the command sync and waits for data sync (correct)

    • How does the transmitting terminal respond if the first command word doesn't contain the appropriate terminal address?

  • It immediately transmits data words
  • It ignores the first command word (correct)
  • It sends a status word to the BC
  • It encounters a communication error

    • What type of command does the transmitting terminal process if the second command word is addressed to it?

    <p>RT-BC command</p> Signup and view all the answers

    What initiates the process of data collection in the receiving terminal?

    <p>The presence of a data sync word</p> Signup and view all the answers

    What does the terminal transmit after receipt and validation of all data words?

    <p>Its status word</p> Signup and view all the answers

    In the context of the 1553 bus, what does 'bidirectional' mean?

    <p>Data can flow in both directions, but not at the same time</p> Signup and view all the answers

    Which component may collect data during RT-RT command transmissions?

    <p>The Bus Controller (BC)</p> Signup and view all the answers

    What conveys information on the MIL–STD–1553 bus?

    <p>Timing and polarity of zero crossings</p> Signup and view all the answers

    Which message transmission format does NOT involve data being transferred?

    <p>BC commands mode change of RT, without any data being transferred</p> Signup and view all the answers

    How many primary types of message transmission formats are defined in the MIL–STD–1553 standard?

    <p>10</p> Signup and view all the answers

    What is the role of the BC in the bi-phase waveform communication?

    <p>To command and transmit data to RTs</p> Signup and view all the answers

    Which of the following is NOT a type of Mode change transmission?

    <p>BC broadcasts data to multiple RTs simultaneously</p> Signup and view all the answers

    Why is the 1553 bus considered forgiving of voltage level variations?

    <p>Information is based on timing rather than voltage magnitude</p> Signup and view all the answers

    Which of the following best describes a Broadcast message transmission?

    <p>Data transmitted from BC to RTs</p> Signup and view all the answers

    What is a key characteristic of the zero crossings in the 1553 bus?

    <p>They represent logical highs and lows in communication</p> Signup and view all the answers

    What is the primary function of the ARINC 629 data bus?

    <p>To provide a time-division multiplex communication method</p> Signup and view all the answers

    Which aircraft served as the test bed for the new data bus technology?

    <p>Boeing 737</p> Signup and view all the answers

    What was the maximum transmission rate of the ARINC 629 data bus?

    <p>2 Mbps</p> Signup and view all the answers

    How many users can the ARINC 629 data bus support?

    <p>120 users</p> Signup and view all the answers

    What event marked the formal adoption of the ARINC 629 specification?

    <p>September 1989</p> Signup and view all the answers

    Which component directly interfaces with the stub cable in the ARINC 629 system?

    <p>Serial Interface Module (SIM)</p> Signup and view all the answers

    What ensures only one terminal transmits at a time in the ARINC 629 system?

    <p>Protocol timers</p> Signup and view all the answers

    What technology was the basis for the ARINC 629 data bus standard?

    <p>DATAC technology</p> Signup and view all the answers

    What is the primary function of the handshaking principle in information transfer formats?

    <p>To validate the receipt of a message by the remote terminal</p> Signup and view all the answers

    What does the command word sent by the Bus Controller specify?

    <p>The memory location for data storage</p> Signup and view all the answers

    Which message is referred to as the receive command?

    <p>Bus Controller to Remote Terminal (BC-RT)</p> Signup and view all the answers

    After validating the command word, what does the Remote Terminal send next in the RT-BC message?

    <p>A status word followed by the requested data words</p> Signup and view all the answers

    What is the maximum number of data words that can be specified in a command word?

    <p>32</p> Signup and view all the answers

    What type of command does a Bus Controller issue to receive data from a remote terminal?

    <p>Receive command</p> Signup and view all the answers

    How does the Remote Terminal confirm its receipt of the transmitted data from the Bus Controller?

    <p>By issuing a status word</p> Signup and view all the answers

    What is the purpose of the Bus Controller in the information transfer process?

    <p>To initiate and manage the data transmission process</p> Signup and view all the answers

    What is the key difference between the 1553 data bus and the ARINC 429 data bus in terms of data transfer signaling?

    <p>ARINC 429 uses Return to Zero (RTZ) coding.</p> Signup and view all the answers

    How many receivers can be connected to a single ARINC 429 transmitter?

    <p>Up to 20 receivers.</p> Signup and view all the answers

    What is the primary format of data transmission in ARINC 429?

    <p>A single 32-bit data word or a NULL state.</p> Signup and view all the answers

    What is indicated by the label field within an ARINC 429 data word?

    <p>The type of data contained in the word.</p> Signup and view all the answers

    Which statement correctly describes the communication method of ARINC 429?

    <p>It uses a point-to-point protocol.</p> Signup and view all the answers

    How does ARINC 429 ensure effective communication among components?

    <p>Through the synchronization of all components.</p> Signup and view all the answers

    What is the fundamental requirement for components using ARINC 429 for successful communication?

    <p>They should speak the same language and be synchronized.</p> Signup and view all the answers

    What methodology does the ARINC 429 system use for signaling?

    <p>Return to Zero (RTZ) signaling.</p> Signup and view all the answers

    Study Notes

    Data Transfer Techniques in Aviation

    • 1553 Bus Signaling: Information transmitted via timing and polarity of zero crossings; magnitude of voltage is not significant.
    • Forgiving Conditions: 1553 bus withstands variations in voltage levels without affecting signal integrity.

    MIL-STD-1553 Message Formats

    • Primary Purpose: Facilitates data exchange between systems using defined message transmission formats.
    • Message Types:
      • Mode change messages for altering the state of remote terminals (RT).
      • Broadcast message transmissions for data dissemination from bus controller (BC) to multiple RTs.
      • Information transfer formats based on command/response philosophy ensuring error-free transmissions.

    Bus Controller to Remote Terminal (BC-RT)

    • Receive Command: BC sends command word to specify data sub-address and the number of data words (up to 32).
    • Status Word: After validating data receipt, the RT sends a status word back to the BC.

    Remote Terminal to Bus Controller (RT-BC)

    • Transmit Command: RT responds by sending its status word followed by requested data words upon BC command validation.

    Remote Terminal to Remote Terminal (RT-RT)

    • Direct Data Transfer: Enables one RT to send data directly to another without going through BC.
    • Command Synchronization: Receiving RT must ignore any unwanted command words until the correct data synchronization is established.

    Bidirectional Nature

    • Data Flow: The 1553 bus allows bi-directional data transfer, but not simultaneous.

    ARINC 429 Data Transfer

    • Manchester II Bi-Phase Coding: Data represented by signal polarity shifts, ensuring independence from voltage levels.
    • RTZ Signaling: ARINC 429 uses Return to Zero, where a voltage of 0 denotes no signal.

    ARINC 429 Protocol Characteristics

    • Point-to-Point: Employs a single transmitter with multiple receivers on a wire pair.
    • Message Structure: Predominantly single 32-bit data words with labels defining data types.

    ARINC 629 Specifications

    • Time-Division Multiplexing: Supports up to 120 users at 2 Mbps; ensures only one terminal transmits at a time.
    • Utilization of Quiet Periods: Terminals must wait for quiet periods to avoid transmission conflicts.
    • Coupler and Terminal Interface: Inclusion of a Serial Interface Module (SIM) within each Line Replacement Unit (LRU) for connection to the global data bus.

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    Description

    Explore the key concepts of digital techniques and electronic instrument systems in aviation. This quiz focuses on the Manchester II Bi-Phase waveform and its relevance to voltage levels and signaling. Ideal for those studying CASA Part 66 materials.

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