Octal-Port DMT ATU-C Line Card
dmt rate-adaptation margin
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Cisco IOS Release 12.1(6)DA
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
The default configuration is derived from the no dmt rate-adaptation enable command. This specifies
minimum upstream and downstream SNR margins of 0 dB.
Command Modes
DSL profile configuration
Command History
Usage Guidelines
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.
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.
Release
Modification
IOS 12.1(6)DA
This command was introduced.
