System information

VDSL Commands
4-109
efm noise-margin
This command sets the noise margin of the selected VDSL port.
Syntax
efm noise-margin [downstream noise margin] [upstream noise margin]
no efm noise-margin
• downstream noise margin - Range 0-9
• upstream noise margin - Range 0-9
Default Setting
0
Command Mode
Interface Configuration
Command Usage
The noise margin indicates how much the noise on the selected VDSL can
increase before the signal is affected. As the noise on the line increases, the
margin will approach zero. If the noise exceeds the current noise margin, the
signal will be lost. You will then need to increase the margin until the signal is
restored.
Example
The following example configures VDSL port 1 with an upstream noise margin of 6 ,
and a downstream margin of 6.
Related Commands
efm interleave (4-108)
show controllers efm-noise-margin (4-118)
efm rate-adapt
This command enables and disables the rate adaption feature on the selected VDSL
port. The data rate on a VDSL line can be affected by factors such as temperature,
humidity, and electro-magnetic radiation. When rate adaption is enabled, the switch
will determine the optimal transmission rate for the current conditions.
Syntax
efm rate-adapt
no efm rate-adapt
Default Setting
Disabled
Command Mode
Interface Configuration
Console(config)#interface ethernet 1/1
Console(config-if)#efm noise-margin 6 6
Console(config-if)#end