Dcc Configuration; Introduction To Dcc; Overview; Approaches To Dcc - 3Com MSR 50 Series Configuration Manual

6

Introduction to DCC

Overview

Approaches to DCC

DCC C
When configuring DCC, go to these sections for information you are interested in:
"Introduction to DCC" on page 153
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"DCC Configuration" on page 157
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"Displaying and Maintaining DCC" on page 179
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"DCC Configuration Example" on page 179
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"Troubleshooting" on page 208
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This section covers these topics:
"Overview" on page 153
■
"Approaches to DCC" on page 153
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"DCC Features" on page 156
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"Preparing for DCC Configuration" on page 156
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Dial control center (DCC) is a routing technology adopted when routers
interconnect through a public switched network like a public switched telephone
network (PSTN) or an integrated services digital network (ISDN). It can provide the
dial-on-demand service where any two routers dial to set up connection when
data needs transferring instead of setting up connection before that. When the
link becomes idle, DCC automatically disconnects it.
Under certain circumstances, connections between routers are instantly
established whenever there is data to be transferred, so data transfer is
time-independent, bursty, and small-sized. DCC is a flexible, economical and
efficient solution for such applications. In DCC, backup mechanisms are available
to guarantee communications. In case a primary line fails, DCC switch traffic over
to a secondary line to ensure ongoing services.
At present, Frame Relay (FR) is widely applied. Usually, users access Frame Relay
networks through leased lines. To reduce the cost and speed up accesses, Frame
Relay over ISDN (FRoI) technology can be used instead. Meanwhile, ISDN can act
as a backup to FR access.
Two approaches are available to DCC: circular DCC
resource-shared DCC
applications. In practice, the two parties in a call do not necessarily adopt the same
approach.
n
DCC terms:
ONFIGURATION
("RS-DCC" on page
("C-DCC" on page
155). They are suitable for different
154), and