Telecom

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Author:
myra
ID:
111445
Filename:
Telecom
Updated:
2011-10-23 17:19:58
Tags:
Telecom
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Description:
Telecom exam 2
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  1. Multiplexing
    refers to the combination of information streams from multiple sources for transmission over a shared medium
  2. Demultiplexing
    refers to the seperation of a combination back into separate information stream
  3. What are the four basic approaches to multiplexing?
    • Frequency Division Multiplexing (FDM)
    • Wavelength Division Multiplexing (WDM)
    • Time Division Multiplexing (TDM)
    • Code Division Multiplexing (CDM)
  4. Which types of of Multiplexing is used widely?
    TDM and FDM
  5. Which form of FDM is used for optical fiber?
    WDM
  6. What is CDM used for?
    is a mathematical approach used in cell phone mechanisms
  7. What is Hierarchical FDM?
    flexibility in FDM arises from the ability of hardware to shift frequencies
  8. What is Dense WDM (DWMD)?
    emphasize that many wavelengths of light can be employed
  9. What is TDM?
    is less esoteric than FDM and does not rely on special properties of electromagnetic energy
  10. In Synchrounous TDM, how are items usually sent?
    Round Robin
  11. What is TDM to refer to the specific form of TDM used for?
    multiplex digital telephone calls

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