Saturday, July 19, 2014

The public telephone networks

Telephone networks are known as public telephone networks.

They consist of :

  •  Trunk exchange .
  •  Local exchange .
  •  And lines between them .
The lines can be divided into trunk lines and local lines.

Simplified Trunk Cable Diagram
Simplified Trunk Cable Diagram

1- The Trunk Networks

Lines which are used for trunk traffic only are described as trunk lines . These networks can be designed as :
  •  Meshed networks
  •  Star networks
  •  Or mixed networks
  • Transmission medium
  •  Symmetric copper pair
  •  Coaxial copper cable
  •  Optical fiber
  •  Air (radio )

Trunk /network Configuration
Trunk /network Configuration


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