System information

VDSL Commands
4-113
show controllers efm actual
Use this command to display the current values of the VDSL link on a specific VDSL
port.
Syntax
show controllers efm interface-id actual {dsrserrs | usrserrs | txpower |
rxpower | snr | link}
• interface-id - ID of the VDSL port.
• dsrserrs - Displays the downstream Reed-Solomon errors on the VDSL port.
• link - Displays the VDSL link status of the VDSL port.
• rxpower - Displays the local receive power (dBm/Hz) on the remote customer
premises equipment (CPE) port.
• snr - Displays the signal-to-noise ratio (SNR) ratio on the VDSL port.
• txpower - Displays the remote transmit power (dBm/Hz) on the VDSL port.
• usrserrs - Displays the upstream Reed-Solomon errors on the VDSL port.
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.
Example
The following example displays the current values of the VDSL link on VDSL switch
port 2.
Console#show controller efm Ethernet 1/2 actual dsrserrs
Downstream Reed-Solomon errors: 0
Console#show controller efm Ethernet 1/2 actual link
Link status: Down
Console#show controller efm Ethernet 1/2 actual rxpower
Local receive power: 26.00 dBm/Hz
Console#show controller efm Ethernet 1/2 actual snr
SNR: 27.00 dB
Console#show controller efm Ethernet 1/2 actual txpower
Remote transmit power: -89.70 dBm/Hz
Console#show controller efm Ethernet 1/2 actual usrserrs
Upstream Reed-Solomon errors: 0
Console#