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Subel. C
6 questions
Subelement C

Satellite Systems:

Section 32

Equipment Faults and troubleshooting-3:

What action should be taken if an Inmarsat Fleet Broadband antenna continuously changes azimuth after initialization?

  • Replace the gyro repeater motor in the Antenna Tracking Unit.
  • Correct Answer
    Use the Web interface to check the event log.
  • Check the EL step motor with power off.
  • Check the integrity of the antenna interface cable.
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What condition would cause failure of an Inmarsat-C terminal to power up when AC voltage is present at the input terminals of the power supply?

  • A defective coaxial cable connecting the terminal to the antenna.
  • The failure of an I.F. amplifier stage in the terminal's receiver.
  • Correct Answer
    A component failure within the power supply itself.
  • A defective video monitor connected to the Inmarsat-C terminal.
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What condition would cause an IP connection failure between a technician's laptop and an Inmarsat Fleet Broadband terminal?

  • The laptop settings are not compatible with the terminal's LAN port.
  • The technician has disabled the Power over Ethernet (POE) function.
  • The EIA-232 configuration is not compatible with the Inmarsat terminal.
  • Correct Answer
    The technician has connected the Ethernet cable to the terminal's ISDN port.
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What condition would cause a connection failure between a technician's laptop and an Inmarsat Fleet Broadband terminal?

  • Correct Answer
    The wrong IP address was entered as the URL in the web browser.
  • The ASD function is enabled but the HSD function is disabled.
  • The terminal's DTE port is set to the Asynchronous Data Service.
  • The password for the High Speed Data service has been improperly entered.
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Interference induced from nearby HF transmitters may cause Inmarsat system failures. What is the most appropriate action to resolve this problem?

  • Install a longer ground lead to the INMARSAT terminal.
  • Install a low-pass filter between the coax cable and antenna.
  • Reduce bias to the INMARSAT antenna's Low Noise Amplifier.
  • Correct Answer
    Install ferrite clamps on the coax cable to suppress induced RF.
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What condition will lower the observed bit rate on a Fleet Broadband terminal?

  • Correct Answer
    A standard IP satellite channel that is "busy" with many active users.
  • Selection of an upstream IP data service for downstream high-speed data transmission.
  • Use of the FTP, POP, SMTP or HTTP protocol instead of TCP/IP.
  • Use of highly contended connections instead of store-and-forward IP circuits.
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