WAN Basics (3)

• Dial-up services

• Devices:

  • switches - operate at the Data Link Layer of the OSI RM
  • access servers - work as concentration point
  • modems - modulation/demodulation analog-digital
  • CSU/DSU - channel/data service unit - adapts physical interface on DTE to a switched circuit network
  • ISDN terminal adapters - ISDN modem

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