3Com MSR 50 Series Configuration Manual page 155

As shown in the above figure, a physical interface can be assigned to only one
dialer interface, but each dialer interface can contain multiple physical interfaces
and be mapped to multiple destination addresses. In addition, a physical interface
does not necessarily belong to any dialer interface. You may directly map it to one
or multiple destination addresses.
In the figure, physical interfaces Serial 2/1, BRI 1/1 and Serial 2/2 are assigned to
Dialer2, where mappings between dial strings and destination addresses are
configured.
RS-DCC
1 Different from C-DCC, RS-DCC separates logical configuration from physical
configuration. Thus, it is simpler and more flexible. RS-DCC delivers these features:
Physical interface configuration and logical configuration for calls are separate.
■
They are associated dynamically when triggered by calls. This allows a physical
interface to provide services for different dial applications.
Associations between dialer interfaces and call destination address are
■
one-to-one. You may configure them with the dialer number command.
Each dialer interface can contain multiple physical interfaces, and each physical
■
interface can be assigned to multiple dialer interfaces.
Dial attributes, such as dialer interface, dialer bundle, and physical interface,
■
are described by an RS-DCC set. All the calls destined to the same network use
the same RS-DCC set.
RS-DCC parameters cannot be directly configured on physical interfaces. A
■
physical interface can participate in RS-DCC only after it is assigned to a dialer
interface.
2 Association of physical interfaces, dialer bundles and dialer interfaces in RS-DCC
Figure 14 Association of physical interfaces, dialer bundles and dialer interfaces
Physical
interface
Dialer
S 2/0
bundle3
BRI1/0
Dialer
bundle2 S 2/1
BRI1/1
S 2/2
Dialer
bundle1
Async5 /0
As shown in the above figure, a physical interface can be assigned to multiple
dialer bundles and serve for multiple dialer interfaces, but each dialer interface can
Introduction to DCC
Dialer interface
dialer number
Dialer1
dialer number
Dialer2
dialer number
Dialer3
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Destination A
Destination B
Destination C