
Dial Services Overview
117353-B Rev. 00
1-3
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 B channels for a
congested leased line, dial-on-demand line, or leased multilink bundle. This
provides a total of 30 B channels for communication. The additional lines
increase bandwidth for data traffic, improving communication and reducing
network delays.
All three dial services work over Public, Switched Telephone Networks (PSTNs)
such as a standard telephone network, a switched 56 Kb/s network, and an
Integrated Services Digital Network (ISDN) (Figure 1-1)
.
Figure 1-1. Example of Dial Access to a Switched Telephone Network
Modem
DSU/CSU
Dial-up line 2
Dial-up line 1
Dial-up line 3
Dial-up line 4
*You only need a terminal adapter if your router does not have built-in ISDN capability.
If your router has an ISDN BRI module or an MCT1 or MCE1 link module installed,
along with ISDN software, you can connect to an ISDN network directly.
Terminal
adapter*
PSTN
Switched
56 Kb/s
network
ISDN
DS0005A
Router
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