System information

Command Line Interface
4-110
Command Usage
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.
Example
The following example shows rate adaption enabled for port 1.
Related Commands
rate-limit (4-99)
efm pbo
This command enables and disables power back-off on the selected VDSL port.
Syntax
[no] efm pbo
Default Setting
Enabled
Command Mode
Interface Configuration
Command Usage
If PBO is enabled the power of transmission from the port will automatically be
adjusted to ensure that the signal successfully reaches the reception port.
Example
The following example shows power back-off enabled for port 1.
Related Commands
show controllers efm status (4-116)
show controllers ethernet-controller
Use this command to display the Ethernet link transmit and receive statistics for a
specific VDSL port, or for all the VDSL ports on the switch and the connected CPE.
Syntax
show controllers ethernet-controller interface-id
interface-id - ID of the VDSL port
onsole#config
Console(config)#interface ethernet 1/1
Console(config-if)#efm rate-adapt
Console(config-if)#
onsole#config
Console(config)#interface ethernet 1/1
Console(config-if)#efm pbo
Console(config-if)#