Avionics Standard Communication Bus
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Questions and Answers

What is the purpose of ASCB terminators?

  • To boost signals along the ASCB
  • To absorb signals and prevent reflection (correct)
  • To control data transmission on the LAN
  • To connect peripheral devices to the LAN

    • What type of cable is used in the Local Area Network?

  • Thick coaxial cable
  • Thin coaxial cable (correct)
  • Fiber optic cable
  • Twisted pair cable

    • What is the function of the NIC in the LAN?

  • To interface with peripheral devices
  • To control data transmission on the LAN (correct)
  • To control the ASCB
  • To load software onto the system

    • What is the purpose of the LAN?

    <p>For development, maintenance, and software loading</p> Signup and view all the answers

    What protocol is used in the LAN?

    <p>Transfer Control Protocol/Internet Protocol (TCP/IP)</p> Signup and view all the answers

    What is the frequency of operation of the CAN bus?

    <p>500 kHz</p> Signup and view all the answers

    What is the primary purpose of the Avionics Standard-Communication Bus (ASCB)?

    <p>To provide a primary communications path between major subsystems of the avionics systems</p> Signup and view all the answers

    What is the speed of the Avionics Standard-Communication Bus (ASCB)?

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

    What is the purpose of the resistor terminations in the ASCB?

    <p>To prevent signal reflections</p> Signup and view all the answers

    What is the duration of each data frame in the ASCB?

    <p>12.5 mS</p> Signup and view all the answers

    What is the purpose of the master network interface controller (NIC)?

    <p>To synchronize the transmission timing across each bus</p> Signup and view all the answers

    What is the purpose of the transformer coupler in the bus coupler?

    <p>To prevent a short circuit on one bus from having an effect on the other buses and to impedance-match the ASCB and the applicable NIC</p> Signup and view all the answers

    What type of communication does the CAN bus use?

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

    What determines which node gets access to the CAN bus in case of multiple nodes trying to transmit at the same time?

    <p>Arbitration ID</p> Signup and view all the answers

    What is unique to each frame transmitted on the CAN bus?

    <p>Arbitration ID</p> Signup and view all the answers

    What happens when multiple nodes try to transmit a message on the CAN bus at the same time?

    <p>The node with the highest priority gets bus access</p> Signup and view all the answers

    What is checked by a CAN node before transmitting data?

    <p>Bus availability</p> Signup and view all the answers

    What feature does the CAN specification include for error checking?

    <p>Error checking on each frame's contents</p> Signup and view all the answers

    What is the purpose of the Linear Variable Differential Transformers (LVDTs)?

    <p>To provide analogue feedback to the Primary Actuator Control Electronics (P-ACE) System</p> Signup and view all the answers

    What bus is used to send digital feedback data from the Primary Actuator Control Electronics (P-ACE) System?

    <p>Controller Area Network (CAN) bus</p> Signup and view all the answers

    What is the primary function of the Flight Control Module (FCM)?

    <p>To transmit commands to the Primary Actuator Control Electronics (P-ACE) module</p> Signup and view all the answers

    What is the purpose of the two AIOP modules in each channel?

    <p>To ensure the servos in that channel are active and engaged</p> Signup and view all the answers

    What is the source of yaw damper and turn coordination signals?

    <p>Flight Guidance Control System (FGCS)</p> Signup and view all the answers

    What is the function of the Avionics Standard-Communication Bus (ASCB)?

    <p>To collect data from avionic and flight control systems</p> Signup and view all the answers

    What advantage does AFDX technology provide in terms of system architecture?

    <p>Flexibility for future developments</p> Signup and view all the answers

    What is the primary function of AFDX switches in the ADCN?

    <p>To manage data traffic on the network</p> Signup and view all the answers

    What is the term 'full-duplex' referring to in the context of AFDX cables?

    <p>Simultaneous transmission and reception on the same link</p> Signup and view all the answers

    What is the composition of an AFDX cable?

    <p>One pair of wires for transmission and one pair for reception</p> Signup and view all the answers

    What is the data transmission rate of AFDX technology?

    <p>10 Mb/s and 100 Mb/s</p> Signup and view all the answers

    What is a key advantage of AFDX technology in terms of physical design?

    <p>Less wiring</p> Signup and view all the answers

    Study Notes

    Avionics Standard Communication Bus (ASCB)

    • ASCB terminators are located at each endpoint of the bus, absorbing signals to prevent reflections.
    • Primary communication path for avionics subsystems, operating at high-speed of 10 Mb/s.
    • Utilizes a single-shielded twisted pair of wires with resistor terminations to minimize signal reflections.
    • Data is transmitted in 12.5 ms frames, which are divided into time slots controlled by Network Interface Controllers (NICs).
    • Redundant network structure consists of four buses: Left Primary, Right Primary, Left Backup, Right Backup.
    • Bus couplers isolate primary and backup buses, preventing shorts and aiding impedance matching between ASCB and NICs.

    Local Area Network (LAN)

    • LAN controlled by NIC, physically and electrically separate from ASCB.
    • Used for development, maintenance, and software loading among avionics systems.
    • Employs thin coaxial cable based on Ethernet, utilizing TCP/IP for peripheral connectivity.

    Controller Area Network (CAN)

    • Standardized bus operating at 500 kHz with multi-point serial digital communications.
    • No master controls; nodes independently check bus availability before sending data.
    • CAN frames characterized by arbitration IDs without transmitting node addresses, allowing all nodes to participate.
    • Higher priority nodes (lower IDs) gain bus access in case of simultaneous transmissions.
    • Incorporates error checking on each frame to ensure data integrity.

    Autopilot and AIOP Modules

    • AIOP modules collect data from ASCB or Flight Guidance Control System (FGCS) for autopilot servo operations.
    • Two modules in each channel: Lane A and Lane B, operating simultaneously for channel engagement.
    • Feedback system leverages Linear Variable Differential Transformers (LVDTs) for analogue feedback to Primary Actuator Control Electronics (P-ACE).
    • P-ACE converts analogue signals to digital format sent via CAN bus to Flight Control Module (FCM) for autopilot processing.

    Avionics Data Communication Network (ADCN) & AFDX

    • ADCN enhanced by AFDX technology, which adapts commercial Ethernet for avionics needs.
    • AFDX provides secure, reliable communications at data rates of 10 and 100 Mb/s.
    • Enables flexibility for future system developments with reduced wiring requirements.
    • Composed of AFDX switches that manage data traffic among connected subscribers.
    • AFDX cables are full-duplex, allowing simultaneous data transmission and reception over a quad twisted cable configuration.

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    Related Documents

    Modular Avionics PDF

    Description

    Learn about the Avionics Standard Communication Bus (ASCB), a high-speed serial data bus used in avionics systems, its transmission timing and data frame structure. Understand the role of NICs in controlling the transmission timing.

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