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Chapter 2
Dial Services Overview
A dial service provides access to a central switched network for remote users,
such as people in branch offices, telecommuters, and sales people in the field. To
make these remote connections, dial services use dial-up lines (also called
switched lines), which are activated only when needed.
If you send a limited amount of data or your data transmission is intermittent,
dial-up lines can be less expensive than leased lines, and they improve network
performance and flexibility.
This chapter introduces Bay Networks dial services. Chapters 4
through 7
describe Bay Networks implementation of each dial service.
Bay Networks Dial Services
The router provides three types of dial services: dial-on-demand, dial backup, and
bandwidth-on-demand. Each dial service serves a different purpose:
• Dial-on-demand service reduces your line costs by establishing a connection
between two devices only when there is data to send. You do not incur the cost
of a leased line that is active regardless of data traffic.
• Dial backup service provides a backup circuit when a leased circuit fails. The
backup circuit serves as an alternative path for data to reach its destination.
• Bandwidth-on-demand service provides up to 29 additional lines for a
congested leased line, dial-on-demand line, or leased multilink bundle. This
provides a total of 30 lines for communication. The additional lines increase
bandwidth for data traffic, improving communication and reducing network
delays.
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