Transmission Media

Transmission Media

1. Types

   • Guided (wired)
     • Twisted pair
       • Connects telephones via switching centres
       • Used for connecting LANs
     • Coaxil
       • Carries high frequency ranges
       • Used in cable TV networks
     • Fiber optic
       • Transmit data in form of light
       • Used in high speed LANs
   • Unguided (wireless)
     • Free space

2. Attenuation

   • Decrease in signal over a distance

3. Crosstalk

   • Signal interference caused by a signal on one pair

4. Noise

   • Signal interference from random background radiation