Cisco IOS Broadband Access Aggregation and DSL Configuration Guide, Release 12.4T - Virtual Auxilliary Port Feature and Configuration of DSL Settings [Cisco IOS Software Releases 12.4 T]

Table Of Contents

Virtual Auxiliary Port Feature and Configuration of DSL Settings

Contents

Information About the Virtual Auxiliary Port

How to Configure the Virtual Auxiliary Port and the DSL Settings

Configuring the Virtual Auxiliary Port

Configuring the DSL Settings

Configuration Example for Configuring the DSL Settings

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

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.

Feature Specifications for the Virtual Auxiliary Port Feature and the DSL Settings

Feature History

Release

Modification

12.2(8)YN

This feature was introduced.

12.3(2)T

This feature was integrated into Cisco IOS Release 12.3(2)T.

Supported Platforms

Cisco 837, Cisco 831, Cisco SOHO 97, and Cisco SOHO 91.

Finding Support Information for Platforms and Cisco IOS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.

Contents

This document contains the following sections:

•Information About the Virtual Auxiliary Port

•How to Configure the Virtual Auxiliary Port and the DSL Settings

•Configuration Example for Configuring the DSL Settings

•Additional References

•Command Reference

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

This section contains the following procedures:

•Configuring the Virtual Auxiliary Port

•Configuring 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. lin con0

4. modem enable

DETAILED STEPS

Command or Action

Purpose

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

Task

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

This section provides an 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

For additional information related to the virtual auxiliary port feature, refer to the following references.

Related Documents

Related Topic

Document Title

Configuring Dial Backup

Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide

Standards

Standards¹

Title

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

¹Not all supported standards are listed.

MIBs

MIBs¹

MIBs Link

No new or modified MIBs are supported by this feature. Support for existing MIBs has not been modified by this feature.

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

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

¹Not all supported MIBs are listed.

RFCs

RFCs¹

Title

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

¹Not all supported RFCs are listed.

Technical Assistance

Description

Link

Technical Assistance Center (TAC) home page, containing 30,000 pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/public/support/tac/home.shtml

Command Reference

The following commands are introduced or modified in the feature or features documented in this module. For information about these commands, see the Cisco IOS Broadband Access Aggregation and DSL Command Reference at http://www.cisco.com/en/US/docs/ios/bbdsl/command/reference/bba_book.html. For information about all Cisco IOS commands, go to the Command Lookup Tool at http://tools.cisco.com/Support/CLILookup or to the Cisco IOS Master Commands List.

•modem enable

•dsl max-tone-bits

•dsl gain-setting rx-offset

•dsl gain-setting tx-offset

•dsl noise-margin

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