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Other
Other
  • Wavelegth division muliplexing (WDM)
    1. is converted back to a single-channel system in order to upgrade capacity as the cost of components declines and fiber costs increase.
    2. designs are not affected by the number of channels or wavekengths required for the systems.
    3. uses more wavelengths spaced closer together than CWDM and DWDM
    4. does for coaxial system what amptitude modulation does for the fiber-optic system.
    5. is a phenomenon where optical beams of light with different wavelengths may propagate thru properly designed fiber-optic system without interfering with one another.
Military
1 vote
Military
  • The physiological significance of Boyle's Law is
    1. it esplains the way in which ascent to altitude induces hypoxia
    2. it forms the conditions which lead to altitude induced bends and chokes
    3. it explains the effects of altitude on the middle ear, sinuses, and GI tract
    4. minimal; the normal human body maintains a near constant temperature
Army
Other
  • Over-the-air antennas
    1. of the yagi type have element lengths that become progressivley longer from the front end to the back end.
    2. used to receive only a single channel are called all-band antennas.
    3. can be mounted at any height or aimed in any direction and still acheive optimum reception.
    4. are unable to reject undesirable signals because the are frequency-selective
    5. used for VHF/UHF channel reception are of basic types, yagi and log periodic.
Other
Other
1 vote
  • Return path signals.
    1. Travel from the headend to the customer premises.
    2. In an HFC system initailly are modulated onto sub-band (5-42 MHz) RF carriers generated by cable modems, digital set-top terminals, and NIU modems.
    3. In an HFC system are converted to RF signals at an optical node and carried the rest of the way to the headend over fiber-optic cables.
    4. Are routed from a sub-band demodulator to an optical receiver that reduces the signals to their baseband components ( video, audio, and/or data).
    5. In an all-coaxial cable system require optical-to-RF conversion, but not amplification.
Other
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