Data Transmission

Data Transmission

1. Transmission Terminology

   • multi-point
     • more than two devices share the link
   • direct link
     • no intermediate devices
   • point-to-point
     • direct link
   • simplex
     • one direction • eg. television
   • half duplex
     • either direction, but only one way at a time • eg. police radio
   • full duplex
     • both directions at the same time • eg. telephone
   • Noise
     • additional signals inserted between transmitter and receiver
     • thermal
     • intermodulation
     • crosstalk
     • impulse

2. Frequency, Spectrum and Bandwidth

   • time domain concepts
     • analog signal
     • digital signal
     • periodic signal
     • aperiodic signal
     • Sine Wave
       • peak amplitude (A)
       • frequency (f)
       • phase ()
   • Frequency Domain Concepts
     • Frequency Domain Representations
     • Addition of Frequency Components (T=1/f)
   • Spectrum & Bandwidth
     • spectrum
       • range of frequencies contained in signal
     • absolute bandwidth
       • width of spectrum
     • effective bandwidth
       •  often just bandwidth  narrow band of frequencies containing most energy
     •  DC Component
       • component of zero frequency

3. Analog and Digital Data Transmission

   • Acoustic Spectrum (Analog)
     • Audio Signals
     • Video Signals
   • Digital Data
     • Analog Signals
     • Digital Signals

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