2.4 The Telephone System & SS7

• The Public Switched Telephone Network (PSTN)

  • the plain old telephone system (POTS)
  • telephones, offices, switches
  • local loop, trunks
  • SONET / SDH

• Switched Networks

  • circuit & packet switching
  • switch architecture

• Signaling System 7

  • protocol layers
  • connection & error control
  • traffic & route management

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