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Subelement J
MF-HF Equip. and Comms:
Section 88
MF-HF SITOR (NBDP) Technical Characteristics
Which of the following statements concerning SITOR (NBDP) communications is true?
  • ARQ transmissions are acknowledged by the Information Receiving Station only at the end of the message.
  • Correct Answer
    ARQ transmissions are made in data groups consisting of three-character blocks.
  • ARQ communications rely upon error correction by time diversity transmission and reception.
  • Forward error correction is an interactive mode.
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Which of the following statements concerning SITOR (NBDP) communications is true?
  • FEC transmissions are made in data groups consisting of three-character blocks.
  • FEC transmissions require a "phasing" or "handshaking" process prior to character transmission.
  • Correct Answer
    FEC transmissions rely upon an error correction technique, which transmits each character twice.
  • FEC transmissions rely upon parity and "repeat requests" to ensure error correction.
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Which statement best defines the SITOR (NBDP) acronym "ARQ"?
  • Error Correction when 2 stations are in direct & phased telephone communications with each other.
  • Error correction for one-way TELEX transmissions to a single other station.
  • Error correction for one-way TELEX broadcasts of weather or navigation information.
  • Correct Answer
    Error Correction with 2 stations are in direct & phased TELEX communications with each other.
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Which statement best defines the SITOR (NBDP) acronym "BFEC"?
  • Correct Answer
    Error correction for one-way TELEX broadcasts of weather or navigation information.
  • Error Correction when 2 stations are in direct & phased telephone communications with each other.
  • Error Correction when 2 stations are in direct & phased TELEX communications with each other.
  • Error correction when 1 station sends a one-way TELEX to a single other station.
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The purpose of "parity" in SITOR (NBDP) communications is?
  • Error correction in HF BFEC MSI broadcasts, SFEC NAVTEX broadcasts and two-way ARQ exchanges.
  • Error correction in SFEC NAVTEX broadcasts, HF SFEC MSI broadcasts and two-way ARQ exchanges.
  • Error correction in BFEC NAVTEX broadcasts, HF BFEC MSI broadcasts and one-way ARQ broadcasts.
  • Correct Answer
    Error correction in HF BFEC MSI broadcasts, NAVTEX broadcasts and two-way ARQ exchanges.
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"SITOR (NBDP)" communications are based on a digital code system:
  • Correct Answer
    Consisting of 7 bits, with four zeros and three ones.
  • Consisting of 7 bits, with four ones and three zeroes.
  • Consisting of 5 bits TELEX and 8 bits Fax.
  • Consisting of 5 bits for ship stations and 7 bits for shore stations.
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