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3.2 Guided Transmission Media

Waves are guided along solid medium

Twisted Pair

Coaxial Cable

Pair of conductors separated by insulation

copper         braided
 core        conductor-------#####||
   -######--------||---------#####|||
  ---####--||      ----------|####|||
   -      |------||----------#####|||
                  ----------
      insulation      protective
                       cover

Baseband Coaxial Cable 50-ohm cable, commonly used for digital transmission.
Broadband Coaxial Cable 75-ohm cable, commonly used for analog transmission.

Optical Fibre

Comparison

Point-to-point transmission
data rate bandwidthrepeater distance
Twisted pair4 Mbps3 MHz2-10 km
Coaxial cable500 Mbps350 MHz1-10 km
optical fibre2 Gbps2 GHz10-100 km

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