System information

Command Line Interface
4-116
Related Commands
show controllers efm actual (4-113)
show controllers efm admin (4-114)
show controllers efm status
Use this command to display the VDSL link statistics and profile information on a
specific VDSL port including link state, link duration, data rates, power levels,
signal-to-noise ratio, and Reed-Solomon errors.
Syntax
show controllers efm status {link | profile} interface-id
• interface - id - ID of the VDSL port
• link - Displays VDSL link parameters and status.
• profile - Displays VDSL link parameters and status.
Default Setting
None
Command Mode
Privileged EXEC
Command Usage
SNR and Reed-Solomon error information display the quality of the VDSL link.
• The SNR represents the upper limit of received signal to noise ratio that the
switch will handle before disconnecting from the remote CPE.
• The Reed-Solomon errors show the number of errors detected and corrected
in the data being received on and transmitted from the VDSL ports.
Reed-Solomon errors are the result of noise exceeding the noise margin.
Note: The Reed-Solomon errors are reset each time the show controllers efm
status link command is performed.
• Interleaving improves Reed Solomon error correction when there is pulse
noise. A greater degree of interleaving will provide more protection against
pulse noise but will increase transmission delay and reduce the effective
bandwidth of the link. The degree of interleaving can be increased by
increasing M or I. M is the interleaving depth indes and I is the interleaving
block length. For details see “VDSL Port Link Status” on page 3-60
• 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.