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Chapter Summary

In this chapter we had an opportunity to take a look at the different WAN technologies used to connect LANs at different locations. Some of these technologies—such as modems, ISDN, and DSL connections—are also used by users who connect to the network remotely.

  • The POTS (Plain Old Telephone System) provides a number of different strategies for WAN connectivity.

  • Dial-up connections over regular analog phone lines using modems provide a relatively inexpensive method of expanding a LAN.

  • Asynchronous modems move data over regular phone lines. Synchronous modems are often used on leased digital lines to provide WAN connectivity.

  • The T-Carrier system provides high-speed digital lines that can transfer voice, video, and data.

  • T-Carrier lines supply a number of channels that can carry voice and data simultaneously on the same line.

  • A multiplexer is used to combine or split the different channels available on a T-Carrier line.

  • ISDN and DSL are WAN technologies that allow for the transfer of data on regular phone lines.

  • Frame Relay and ATM are both packet-switching WAN technologies that provide for the high-speed movement of data over switched networks.

  • Remote access is another method of expanding the LAN beyond its geographical boundaries. Remote users can connect to the LAN and access the same resources as local users.


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