Octal-Port DMT ATU-C Line Card

dmt rate-adaptation margin

dmt rate-adaptation margin

To configure the minimum acceptable SNR margins on a DMT port, which force the port to retrain when bad margins exist for the duration of the dmt rate-adaptation interval, use the dmt rate adaptation margin command in DSL profile configuration mode. To disable dmt rate adaptation margin use the no form of this command.

dmt rate-adaptation margin {min [downstream dB upstream dB]}

Syntax Description

Defaults

Command Modes

Command History

Usage Guidelines

min

The min keyword specifies that you are configuring the minimum

 

acceptable SNR margins on a port. If the port SNR exceeds the configured

 

value, the port retrains to a lower bit rate.

 

 

downstream

Specifies the minimum acceptable SNR margin for downstream traffic on

 

a port.

 

 

dB

SNR margins measured in decibels. The valid range is –15 to 15.

 

 

upstream

Specifies the minimum acceptable SNR margin for upstream traffic on

 

a port.

 

 

dB

SNR margins measured in decibels. The valid range is -15 to 15.

 

 

The default configuration is derived from the no dmt rate-adaptation enable command. This specifies minimum upstream and downstream SNR margins of 0 dB.

DSL profile configuration

ReleaseModification

IOS 12.1(6)DA

This command was introduced.

 

 

Use the dmt rate-adaptation margin command to configure the acceptable SNR margin thresholds on a specified port. The dmt rate-adaptation margin command works in conjunction with the

dmt rate-adaptation interval command. If the actual SNR margins on a port remain lower than the margins configured in the dmt rate-adaptation margin command, for the duration of time specified in the dmt rate-adaptation interval command, the line drops and retrains to a lower bit rate, to improve SNR margin quality on the line.

Note If line conditions improve, the line does not automatically drop and retrain to a higher bit rate. If the line conditions improve, the administrator must execute a shut then a no shut on the affected port to retrain to a higher bit rate.

Cisco IOS Release 12.1(6)DA

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Cisco Systems 8xDMT manual Dmt rate-adaptation margin min downstream dB upstream dB, Min

8xDMT specifications

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