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Performance and Fault Management by James M. Thompson, Kent J. Phelps, Robert L. Pavone, Christopher E. Elliott, Paul L. Della Maggiora

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Chapter 17. Monitoring WAN Technologies—ISDN and Dial

The use of network access servers (NAS) transcends the division between service providers and enterprise networks. Service providers tend to supply public and private dial-in services for businesses or individual home users. Enterprises tend to provide private dial-in access for employees dialing in from remote LANs (a remote office) or individual remote nodes (a telecommuter). Additionally, there are hybrid forms of dial access—virtual private dial networks (VPDNs)—that are jointly owned, operated, and set up by service providers and enterprises.

Both service providers and enterprise network managers have to find ways to manage the modems, lines, and calls that are being made through the ...

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