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Subelement I
Inmarsat Equip. & Comms:
Section 62
Inmarsat General System Operations-1:
What is the primary function of an NCS?
  • To provide direct communications between the Inmarsat station placing a call and the station receiving the call.
  • To provide multi-mode communications between the Inmarsat station placing a call and the coast radio station that will deliver it.
  • To determine which satellite is best suited to provide communications between the Inmarsat station placing a call and the station receiving the call.
  • Correct Answer
    To monitor and control communications through the Inmarsat satellite for which it is responsible.
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What is the primary function of a LES?
  • Correct Answer
    To provide direct communications between the Inmarsat station placing a call and the station receiving the call.
  • To monitor and control communications through the Inmarsat satellite for which it is responsible.
  • To provide multi-mode communications between the Inmarsat station placing a call and the coast radio station that will deliver it.
  • To determine which satellite is best suited to provide communications between the Inmarsat station placing a call and the station receiving the call.
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Messages are transmitted by an Inmarsat LES according to what criteria?
  • First In, First Out
  • Correct Answer
    Priority
  • Last In, First Out
  • Serial Number
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How is maximum coverage provided by satellites in the maritime satellite service?
  • Four satellites in polar orbit.
  • Four satellites in geo-stationary orbit for each Inmarsat Service (B, C, F77 and M).
  • Correct Answer
    Four satellites in geo-stationary orbit approximately 22,184 miles above the equator.
  • Through coordinated use of COSPAS-SARSAT satellites.
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What is meant by the characters GA+ on an Inmarsat terminal?
  • Go ahead for store & forward telex operations.
  • The instruction to "give address".
  • Correct Answer
    Go ahead for live telex operations.
  • General Address (to all stations).
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What is the purpose of a CODEC?
  • Noise and echo-canceling used in TELEX operation.
  • To enable Distress communications.
  • To enable data communications.
  • Correct Answer
    To convert analog voice signals to digital transmissions.
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