Physical Layer

Moves bits from one end to other.
No guarantee for service possible! (why?)

• Media Dependent
  • Copper (Co-axial, Twisted Pair) make these links to jpgs
    • Typically upto 100 Megabits/second
  • Fibre (Single mode, Multi mode) fibre is also a link
    • Can transmit in Gigabits/second!
  • Satellite make a link
    • Typically channels of 64 kbps, 128 kbps
  • Radio waves make a link