
Dial Services Overview
117353-B Rev. 00
1-23
For a demand circuit, the PPP Demand Circuits window includes a
BW on Demand button that lets you associate the demand circuit with an existing
bandwidth-on-demand pool. It also lets you configure bandwidth-on-demand
monitor parameters that determine when the demand circuit is congested.
Bandwidth-on-demand service is supported on asynchronous lines (RS-449),
synchronous lines (RS-449, V.35, RS-422, and X.21), and ISDN interfaces.
You can use the following types of lines and protocols for bandwidth-on-demand
service:
• Leased lines -- A single leased line, a multilink bundle, a switched
dial-on-demand line. Protocol supported: PPP multilink.
• Secondary dial-up lines -- Any WAN line.
Protocols supported: asynchronous or synchronous PPP multilink,
BAP for ISDN lines.
The leased lines and secondary dial-up lines may operate at different speeds.
Figure 1-10
shows how secondary lines support a leased connection.
Figure 1-10. An Example of Bandwidth-on-Demand Service
Remote site BCentral site A
PPP multilink (64 Kb/s)
ISDN
DS0006A
Key
Secondary dial-up lines
(ISDN B channels)
Leased line with
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