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Subel. 5
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Subelement 5

Transmitters, Modulation and Processing

Section 5-08

codes and protocols, Baudot, ASCII, parity, CRC, X.25, ISO layers

What digital code consists of elements having unequal length?

  • AX.25
  • Baudot
  • Correct Answer
    Morse code
  • ASCII
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The International Organization for Standardization has developed a sevenlevel reference model for a packet-radio communications structure. What level is responsible for the actual transmission of data and handshaking signals?

  • The link layer
  • Correct Answer
    The physical layer
  • The network layer
  • The transport layer
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The International Organization for Standardization has developed a sevenlayer reference model for a packet-radio communications structure. What level arranges the bits into frames and controls data flow?

  • Correct Answer
    The link layer
  • The synchronization layer
  • The communications layer
  • The transport layer
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What is one advantage of using ASCII rather than Baudot code?

  • Correct Answer
    It is possible to transmit upper and lower case text
  • ASCII includes built-in error correction
  • ASCII characters contain fewer information bits
  • The larger character set allows storeand- forward
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What type of error control system is used in AMTOR ARQ (Mode A)?

  • The receiving station checks the frame check sequence (FCS) against the transmitted FCS
  • Each character is sent twice
  • Correct Answer
    The receiving station automatically requests repeats when needed
  • Mode A AMTOR does not include an error control system
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What error-correction system is used in AMTOR FEC (Mode B)?

  • Mode B AMTOR does not include an error-correction system
  • The receiving station automatically requests repeats when needed
  • The receiving station checks the frame check sequence (FCS) against the transmitted FCS
  • Correct Answer
    Each character is sent twice
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What is the primary advantage of AMTOR over Baudot RTTY?

  • Surplus teletype machines that use AMTOR are readily available
  • Correct Answer
    AMTOR includes an error detection system
  • Photographs may be transmitted using AMTOR
  • AMTOR characters contain fewer information bits than Baudot characters
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We have all used the term ASCII when using computers or teletypewriting equipment. What do those initials represent?

  • A Standard Code for Information Interchange
  • Correct Answer
    American Standard Code for Information Interchange
  • North American System Compatible with International Interchange
  • Amalgamated System Code for Information Interchange
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The designator AX.25 is associated with which amateur radio mode?

  • Correct Answer
    packet
  • RTTY
  • ASCII
  • spread spectrum speech
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How many information bits are included in the Baudot code?

  • 7
  • Correct Answer
    5
  • 8
  • 6
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How many information bits are included in the ASCII code?

  • Correct Answer
    8
  • 7
  • 6
  • 5
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