Basic HTML version of Foils prepared Dec. 6 98

Foil 6 WAN Basics (3)

From Introduction to Network WANs Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
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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