Network Data Transmission

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• network data transfer works by:
  • modulating the properties of a transmission medium (electric current, infrared light, radio waves) to encode a signal
  • voltage pulses encode symbols
  • mapped to digital bits (0 and 1s)
• each media type supports a range of frequencies
  • called media bandwidth
  • higher frequency = more data per second

Bandwidth

• bandwidth is defined as a frequency range measured in cycles per second or Hertz (Hz)
• but in data networking often means the amount of data that can be transferred
  • measured in multiples of bits per second (bps)
• Encoding means a signal with 100 MHz frequency bandwith can transfer much more than 100 Mbps