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Subelement I
Inmarsat Equip. & Comms:
Section 65
Inmarsat-C: Equipment and Operations-1:
Which mode of communications is NOT possible through an Inmarsat-C SES?
  • Correct Answer
    Shore-to-ship Facsimile
  • Data
  • TELEX
  • Emergency Activation
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What is the average length of time required for a TELEX sent by Inmarsat-C to be delivered to the addressee?
  • All Inmarsat-C communications are made with real-time connectivity so there is no delay in message delivery.
  • Correct Answer
    The average delivery time for a message sent by Inmarsat-C is about 10 minutes.
  • Date/time notification of delivery is possible only through Inmarsat-B.
  • The average delivery time for a TELEX sent by Inmarsat-C is about 10 minutes, but fax and data messages sent by Inmarsat-C require about 30 minutes for delivery.
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How is a signal radiated from an Inmarsat-C system's antenna?
  • It is a highly focused directional signal that must be beamed at the desired satellite.
  • It is usually radiated in an omni-directional pattern, but an optional feature allows it to be directional for use when the vessel is on the fringe of the satellite's footprint.
  • Correct Answer
    It is radiated in an omni-directional pattern.
  • It is radiated in an omni-directional pattern that can be reversed by the Operator to attain directional beaming to an alternate satellite.
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What statement is true regarding Inmarsat-C?
  • There is a propagation delay, but a direct connection is made between the ship and shore users.
  • There are delays in establishing communications. Then a direct real-time connection is maintained with the other party.
  • The TELEX message is stored until the mailbox is accessed by the station desiring to retrieve their message.
  • Correct Answer
    This is a store and forward network, with an intermediate step that means there is no direct connection between ship and shore users.
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With an Inmarsat-C LES, how are messages routed to receiving stations?
  • Correct Answer
    All messages are forwarded via a store and forward network.
  • Direct connections are made to the receiving stations via gateways.
  • Intermediary stations are used to connect the sending station with the receiving station in a real-time mode.
  • Messages are stored until the network is polled by the receiving station.
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What are the directional characteristics of the Inmarsat-C SES antenna?
  • Highly directional parabolic antenna requiring stabilization.
  • Correct Answer
    Omni-directional.
  • Wide beam width in a cardioid pattern off the front of the antenna.
  • Very narrow beam width straight-up from the top of the antenna.
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