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What Is A Carrier
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What Is A Carrier


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Discussion of Carriers

Discussion of Carriers

Published in: Business, Technology

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  • 1. What is a Carrier Discussion
  • 2. Carrier Signal
    • A frequency in a communications channel modulated to carry analog or digital signal information. For example, an FM radio transmitter modulates the frequency of a carrier signal and the receiver processes the carrier signal to extract the analog information. An AM radio transmitter modulates the amplitude of a carrier signal.
  • 3. Carrier System
    • A communications system providing a number of point-to-point channels through some type of multiplexing . T-1 and T-3 carrier services are examples of carrier systems that can be used between points in a Wide Area Network (WAN) .
  • 4. carrier service provider :
    • A company offering telephone and data communications between points in a state or in one or more countries. The Regional Bell Operating Companies (RBOCs) are example of carriers.
  • 5. Modulation
    • Technique for impressing information (voice, music, picture, or data) on a radio-frequency carrier wave by varying one or more characteristics of the wave in accordance with the intelligence signal
  • 6. Modulation Types
    • b) Amplitude modulation (AM)
    • b) Frequency Modulation (FM)
    • c) Phase Modulation (PM)
    • d) Pulse coded Modulation (PCM)
    • e) Pulse Duration Modulation (PDM)
  • 7. Amplitude Modulation (AM)
    • Auditory or visual information is impressed on a carrier wave by varying the amplitude of the carrier to match the fluctuations in the audio or video signal being transmitted
  • 8. Frequency Modulation (FM)
    • The amplitude of the carrier is kept constant, but its frequency is altered in accordance with variations in the audio signal being sent.
  • 9. Phase Modulation
    • The phase of a carrier wave is varied in response to the vibrations of the sound source in phase modulation (PM).
  • 10. Pulse-coded modulation (PCM),
    • In the intelligence signal converts the carrier into a series of constant-amplitude pulses spaced in such a manner that the desired intelligence is contained in coded form.
  • 11. Pulse-duration modulation (PDM),
    • Another kind of pulse modulation is in which intelligence is represented by the length and order of regularly recurring pulses.
  • 12. What is a wavelength?
    • The distance between the peak of one wave to the next.
  • 13. Adding intelligence to the waveform
    • By modulating a waveform we can add intelligence to the transmitted wave.
  • 14. Carrier
    • The Carrier is the portion of the wave which carries no inteligence
    • the unmodulated single-frequency electromagnetic wave that carries the desired information