Dcc Features; Preparing For Dcc Configuration - 3Com MSR 50 Series Configuration Manual

156 C 6: DCC C
HAPTER ONFIGURATION

DCC Features

Preparing for DCC
Configuration
use only one dialer bundle and configured with one dial string. The physical
interfaces in a dialer bundle can be assigned different priorities.
In the figure, interface Dialer2 uses Dialer bundle 2 that contains physical
interfaces BRI 1/0, BRI 1/1 and Serial 2/1. Suppose BRI 1/0 is assigned the priority
of 100, BRI 1/1 the priority of 50, and Serial 2/1 the priority of 75. Since BRI 1/0
has a higher priority over BRI 1/1 and Serial 2/1, it will be preferred first when
Dialer2 wants to place a call.
This section covers these topics:
"Basic DCC features" on page 156
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"Callback through DCC" on page 156
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Basic DCC features
The following are basic DCC features:
Support a wide range of dial interfaces, such as synchronous/asynchronous
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serial interface, AUX port, ISDN BRI or PRI interface, and AM interface to
accommodate to different networking requirements.
Support link layer protocols such as PPP and FR on dial interfaces (physical or
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dialer).
Support IP on dial interfaces.
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Support dynamic routing protocols such as RIP and OSPF on dial interfaces.
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Provide flexible dial interface backup
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Allow you to manage different modems at the user interface.
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Callback through DCC
In callback, the called party originates a return call to the calling party. The calling
party is the client, and the called party is the server. The callback client originates a
call first, and the callback server decides whether to originate a return call. If a
callback is needed, the server will immediately disconnect and originate a return
call.
DCC callback brings these benefits:
Enhance security: When placing a return call, the server dials the calling
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number configured at the local end. This prevents the insecurity resulted from
user name and password compromise.
Change the charge bearer. This is useful for saving cost in the case that the call
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rates in two directions are different.
Consolidate call charge bills to facilitate settlement.
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At present, PPP callback and ISDN caller identification callback features are
available. The PPP callback conforms to RFC1570 specifications and can be used
where both client and server own fixed network addresses, or the client accepts
dynamic network address assignment.
When preparing for DCC configuration, you need to do the following:
"Identifying the topology of DCC application" on page 157
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