Virtual Auxiliary Port Feature and Configuration of DSL Settings

The virtual auxiliary port feature provides support for dial backup and out-of-band management on Cisco 837 and Cisco 831 routers, and provides support for out-of-band management on Cisco SOHO 97 and Cisco SOHO 91 routers. On these routers, the console port and the auxiliary port share the same physical RJ-45 port. The console port must be changed to act as a virtual auxiliary port, using the command-line interface (CLI) before the dial backup and out-of-band management capabilities can be enabled.

In addition, digital subscriber line (DSL) settings can now be configured on the Cisco 837, Cisco 831, Cisco SOHO 97, and Cisco SOHO 91 routers by using the DSL settings commands.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Information About the Virtual Auxiliary Port

When the virtual auxiliary port is enabled, the signals directed from the RJ-45 pins are processed by the auxiliary port driver, and the console port is disabled. The virtual auxiliary port can be used to provide the standard Cisco IOS interactive user interface.

How to Configure the Virtual Auxiliary Port and the DSL Settings

Configuring the Virtual Auxiliary Port

Perform these steps to configure the virtual auxiliary port.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    line con0

    4.    modem enable


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Router> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2 configure terminal


    Example:
    Router# configure terminal
     

    Enters global configuration mode.

     
    Step 3 line con0


    Example:
    Router(config)# line con0
     

    Enters line configuration mode for the console interface.

     
    Step 4 modem enable


    Example:
    Router(config-line)# modem enable
     

    Changes the console port to function as an auxiliary port.

     

    Configuring the DSL Settings

    Perform these steps to configure the DSL settings.


    Note

    For each DSL setting to take effect, the asymmetric digital subscriber line (ADSL) driver resets the ADSL subsystem, which causes the firmware to be downloaded again.

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    interface atm0

      4.    dsl noise-margin decimal

      5.    end

      6.    enable

      7.    configure terminal

      8.    interface atm0

      9.    dsl max-tone-bits integer

      10.    end

      11.    enable

      12.    configure terminal

      13.    interface atm0

      14.    dsl gain-setting tx-offset decimal

      15.    end

      16.    enable

      17.    configure terminal

      18.    interface atm0

      19.    dsl gain-setting rx-offset decimal

      20.    end


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example:
      Router> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.

       
      Step 2 configure terminal


      Example:
      Router# configure terminal
       

      Enters global configuration mode.

       
      Step 3 interface atm0


      Example:
      Router(config)# interface atm0
       

      Enters interface configuration mode.

       
      Step 4 dsl noise-margin decimal


      Example:
      Router(config-if)# dsl noise-margin 0.5
       

      Sets the noise margin offset.

      • Decimal ranges from -3 dB to 3 dB with a granularity of 0.5 dB.

       
      Step 5 end


      Example:
      Router(config-if)# end
       

      Exits interface configuration mode and resets the ADSL subsystem.

       
      Step 6 enable


      Example:
      Router> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.

       
      Step 7 configure terminal


      Example:
      Router# configure terminal
       

      Enters global configuration mode.

       
      Step 8 interface atm0


      Example:
      Router(config)# interface atm0
       

      Enters interface configuration mode.

       
      Step 9 dsl max-tone-bits integer


      Example:
      Router(config-if)# max-tone-bits 10
       

      Sets the maximum bits per tone limit.

      • Integer ranges from 2 dB to 14 dB with a granularity of 1 dB.

       
      Step 10 end


      Example:
      Router(config-if)# end
       

      Exits interface configuration mode and resets the ADSL subsystem.

       
      Step 11 enable


      Example:
      Router> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.

       
      Step 12 configure terminal


      Example:
      Router# configure terminal
       

      Enters global configuration mode.

       
      Step 13 interface atm0


      Example:
      Router(config)# interface atm0
       

      Enters interface configuration mode.

       
      Step 14 dsl gain-setting tx-offset decimal


      Example:
      Router(config-if)# dsl gain-setting tx-offset 0
       

      Sets the transmit gain offset.

      • Decimal ranges from -10 dB to 3 dB with a granularity of 0.5 dB.

       
      Step 15 end


      Example:
      Router(config-if)# end
       

      Exits interface configuration mode and resets the ADSL subsystem.

       
      Step 16 enable


      Example:
      Router> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.

       
      Step 17 configure terminal


      Example:
      Router# configure terminal
       

      Enters global configuration mode.

       
      Step 18 interface atm0


      Example:
      Router(config)# interface atm0
       

      Enters interface configuration mode.

       
      Step 19 dsl gain-setting rx-offset decimal


      Example:
      Router(config-if)# dsl gain-setting rx-offset 1
       

      Sets the receive gain offset.

      • Decimal ranges from -5 dB to 3 dB with a granularity of 0.5 dB.

       
      Step 20 end


      Example:
      Router(config-if)# end
       

      Ends the configuration mode.

       

      Configuration Example for Configuring the DSL Settings

      interface atm0
no ip address
dsl noise-margin 0
dsl max-tone-bits 14
dsl gain-setting tx-offset 0
dsl gain-setting rx-offset 1

      Additional References

      Related Documents

      Related Topic

      Document Title

      Cisco IOS commands

      Cisco IOS Master Command List, All Releases

      Cisco IOS Broadband Access Aggregation and DSL commands

      Cisco IOS Broadband Access Aggregation and DSL Command Reference

      High Availability

      "High Availability Overview" chapter in the Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide

      Performing an ISSU

      The following chapters in the Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide :

      • "Cisco IOS XE Software Package Compatibility for ISSU"

      • "In Service Software Upgrade (ISSU)"

      Broadband ISSU

      "Broadband High Availability In Service Software Upgrade" module

      Stateful switchover

      "Stateful Switchover" module

      Configuring nonstop forwarding

      "Configuring Nonstop Forwarding" module

      Layer 2 Tunnel Protocol

      Layer 2 Tunnel Protocol Technology Brief" module

      Standards

      Standard

      Title

      No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

      --

      MIBs

      MIB

      MIBs Link

      None

      To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:

      http:/​/​www.cisco.com/​go/​mibs

      RFCs

      RFC

      Title

      No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

      --

      Technical Assistance

      Description

      Link

      The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

      http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

      Feature Information for Configuring the DSL Settings

      The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

      Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to . An account on Cisco.com is not required.
      Table 1 Feature Information for Phrase Based on Module Title

      Feature Name

      Releases

      Feature Information

      Virtual Auxiliary Port Feature and Configuration of DSL Settings

      12.2(8)YN 12.3(2)T

      The virtual auxiliary port feature provides support for dial backup and out-of-band management on Cisco 837 and Cisco 831 routers, and provides support for out-of-band management on Cisco SOHO 97 and Cisco SOHO 91 routers. On these routers, the console port and the auxiliary port share the same physical RJ-45 port. The console port must be changed to act as a virtual auxiliary port, using the command-line interface (CLI) before the dial backup and out-of-band management capabilities can be enabled.

      In addition, digital subscriber line (DSL) settings can now be configured on the Cisco 837, Cisco 831, Cisco SOHO 97, and Cisco SOHO 91 routers by using the DSL settings commands.

      The following commands were introduced or modified: modem enable, dsl max-tone-bits, dsl gain-setting rx-offset, dsl gain-setting rx-offset, dsl gain-setting tx-offset, dsl noise-margin.