3Com MSR 50 Series Configuration Manual page 154

154 C 6: DCC C
HAPTER ONFIGURATION
Physical interface: An interface that physically exists. Examples are serial, BRI,
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and asynchronous interfaces.
Dialer interface: A logical interface created for configuring DCC parameters. A
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physical interface inherits the DCC configuration of a dialer interface if it is
assigned to the dialer interface.
Dial interface: Any interface used for dialup connection. It can be a dialer
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interface, a physical interface assigned to a dialer interface, or a physical
interface directly configured with DCC parameters.
C-DCC
1 Features of C-DCC
A logical dial (dialer) interface can contain multiple physical interfaces, but a
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physical interface can be assigned to only one dialer interface. That is, a
physical interface can only provide one type of dial service.
You may assign a physical interface to a dialer interface to inherit DCC
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parameters by assigning it to a dialer circular group, or directly configure DCC
parameters on the physical interface.
All the physical interfaces in a dialer circular group inherit the attributes of the
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same dialer interface.
You may associate a dialer interface with multiple call destination addresses by
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configuring the dialer route command or with a single call destination address
by configuring the dialer number command.
C-DCC is powerful and has broad applications. However, it lacks flexibility and
extensibility.
For example, on an ISDN BRI interface, all the B channels inherit its configuration
in the C-DCC approach. The static binding between call destination address
settings and physical interface configurations will restrict the use of C-DCC, as
dialer routes are becoming increasingly complicated as a result of network growth
and support to more protocols.
2 Association of physical interfaces and dialer interfaces in C-DCC
Figure 13 Association between physical interfaces and dialer interfaces
Physical
interface
S2 /0
BRI1/0
S2 /1
BRI1/1
S2 /2
Async5/0
Dialer interface
dialer number
Dialer 1
dialer route
Dialer 2
dialer route
Destination A
Destination B
Destination C