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Chapter 1
Dial Services Overview
A dial service connects remote users through a central switched network to other
destinations on the network using dial-up lines (also called switched lines).
Dial-up lines are temporary connections that a router activates when there is data
to send across the network, when a failed connection needs a backup connection,
or when a congested leased line needs an additional connection for more
bandwidth.
For remote users such as people in branch offices, telecommuters, and sales
people in the field, dial-up lines can be a cost-effective alternative to leased lines
and packet networks, which are permanent connections that are available
regardless of network traffic.
Nortel Networks offers three dial services: dial-on-demand, dial backup, and
bandwidth-on-demand. This chapter includes the following information:
Chapters 5 through 8 describe the Nortel Networks implementation of each dial
service.
Topic Page
How to Use This Guide 1-2
Nortel Networks Dial Services 1-3
Dial-on-Demand Service 1-5
Dial Backup Service 1-14
Bandwidth-on-Demand Service 1-22
Using the Same Line for All Dial Services 1-27
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