
114062 Rev. A 1-1
Chapter 1
Dial Services Overview
A dial service provides access to a switched network by means of a dial-up line
(also called a switched line). Dial-up lines are active only as-needed -- that is,
when there is data to send across the network, or when a dial-up line acts as a
resource for a failed or congested leased line. Dial-up lines can be a cost-effective
alternative to leased lines and packet networks, which are permanent connections
and therefore available regardless of network traffic.
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 maximize network
performance and flexibility.
This chapter introduces Bay Networks dial services.
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 the destination.
• Bandwidth-on-demand service provides up to 29 additional lines for a
congested leased line, a dial-on-demand line, or a 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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