GMDSS. FCC Test 52 – Online Maritime Tests

Which of the following statements concerning SITOR communications is true?

FEC transmissions require a 'phasing' or 'handshaking' process prior to character transmission.
FEC transmissions rely upon error correction by time diversity transmission and reception.
FEC transmissions are made in data groups consisting of three-character blocks.
FEC transmissions rely upon parity and 'Repeat Requests' to ensure error correction.

Which statement best defines the SITOR acronym 'FEC'?

Error correction for one-way telex broadcasts of weather or navigation information.
Error Correction when 2 stations are in direct & phased telex communications with each other.
None of the above.
Error Correction when 2 stations are in direct & phased telephone communications with each other.

Which of the following statements concerning SITOR communications is true?

ARQ transmissions are acknowledged by the Information Receiving Station only at the end of the message.
ARQ transmissions are made in data groups consisting of three-character blocks.
Forward error correction is an interactive mode.
ARQ communications rely upon error correction by time diversity transmission and reception.

Which statement best defines the SITOR acronym 'ARQ'?

Either a
None of the above.
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.

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