Cisco Octal-Port DMT ATU-C Line Card Information Manual page 24

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.
Syntax Description min
downstream
dB
upstream
dB
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 Release
IOS 12.1(6)DA
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.
Cisco IOS Release 12.1(6)DA
24
dmt rate-adaptation margin {min [downstream dB upstream dB]}
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.
Specifies the minimum acceptable SNR margin for downstream traffic on
a port.
SNR margins measured in decibels. The valid range is –15 to 15.
Specifies the minimum acceptable SNR margin for upstream traffic on
a port.
SNR margins measured in decibels. The valid range is -15 to 15.
Modification
This command was introduced.
Octal-Port DMT ATU-C Line Card