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Subelement I

Inmarsat Equip. & Comms:

Section 62

Inmarsat General System Operations

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.

What is the primary function of a LES?

(A).   To provide direct communications between the Inmarsat station placing a call and the station receiving the call.

For more information, please see the pdf document from Inmarsat Maritime site, titled INTERNATIONAL SAFETYNET HANDBOOK

Also, please see the Code of Federal Regulations, Title 47 Chapter I Subchapter B Part 25 - SATELLITE COMMUNICATIONS, and search using Ctrl-F for the word "Inmarsat" for relevant information.

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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 communications coverage provided by satellites in the Inmarsat maritime satellite service?

  • Four satellites in polar orbit to provide worldwide coverage.
  • Four satellites in geo-stationary orbit for each Inmarsat Service (C and FBB).
  • 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 factors bear on the choice of NCS on an Inmarsat terminal?

  • NAVAREA weather patterns, shore-ship routine communications, signal strength.
  • Best email provider, preventing interference in port, Distress SAR choices.
  • Correct Answer
    Signal strength, Distress SAR choices, choice of MSI NAVAREAS.
  • Minimize overlapping footprint coverage, reduce ship-ship message costs, receive BALD warnings.
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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.

CODEC compresses and decompresses (hence CO-DEC) information onto a carrier signal.

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