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Cisco Secure Router 520 Series Software Configuration Guide
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Chapter 4 Configuring PPP over ATM with NAT
Configure DSL Signaling Protocol
Configure DSL Signaling Protocol
DSL signaling must be configured on the ATM interface for connection to your ISP. The
Cisco Secure Router 520 ADSL-over-POTS routers support ADSL signaling over POTS and the
Cisco Secure Router 520 ADSL-over-ISDN routers support ADSL signaling over ISDN. To configure
the DSL signaling protocol, see the “Configuring ADSL” section on page 4-6.

Configuring ADSL

The default configuration for ADSL signaling is shown in Table 4-1.
If you wish to change any of these settings, use one of the following commands in global configuration
mode:
• dsl operating-mode (from the ATM interface configuration mode)
• dsl lom integer
• dsl enable-training-log
See the Cisco IOS Wide-Area Networking Command Reference for details of these commands.
Step 5 no shutdown
Example:
Router(config-if-atm-vc)# no shutdown
Router(config-if)#
Enables interface and configuration changes just
made to the ATM interface.
Step 6 exit
Example:
Router(config-if)# exit
Router(config)#
Exits configuration mode for the ATM interface.
Command Purpose
Tab l e 4-1 Default ADSL Configuration
Attribute Description Default Value
Operating mode Specifies the operating mode of the digital subscriber line
(DSL) for an ATM interface.
• ADSL over POTS—ANSI or ITU full rate, or
automatic selection.
• ADSL over ISDN—ITU full rate, ETSI, or
automatic selection.
Auto
Loss of margin Specifies the number of times a loss of margin may occur. —
Training log Toggles between enabling the training log and disabling the
training log.
Disabled