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ADSL WAN Connections
Troubleshooting the ADSL Connection
Figure 7-21. show interfaces adsl Command
If the signal attenuation is high, you may want to adjust the SNR margin setting.
The interface may have shut itself down because the line could not support
the SNR margin at the limit you set. You may want to increase the SNR margin
and see if the ADSL interface can establish and maintain the connection
over time.
If the ADSL configuration settings appear to be correct, you should check the
physical links for disconnected or bad cables. If you have another UTP ribbon
cable, try using it to connect the ADSL interface to the wall jack.
debug interface adsl events Command
In addition to viewing information about the ADSL interface, you can view
events related to the ADSL connection in real time. From the enable mode
context, enter:
Syntax: debug interface adsl events
adsl 2/1 is DOWN, line protocol is DOWN
Link Status Training UNKNOWN
Line Type
Line Length 0 ft
Downstream Upstream
Line Rate 0 kbps 0 kbps
Current margin 0.0 dB 0.0 dB
Attenuation 0.0 dB 0.0 dB
Power 0.0 dB 0.0 dB
Prev Rate 0 kbps 0 kbps
Actual Delay 0 msecs 0 msecs
Loss of Framing Seconds 0 0
Loss of Signal Seconds 0 0
Loss of Power Seconds 0 0
Errored Seconds 0 0
Line Inits 0 N/A
Rx Blocks 0 0
Tx Blocks 0 0
Corrected Blocks 0 0
UncorrectedBlocks 0 0
Last Failure NONE
Last Failure Time N/A
DMT Bits Per Bin
000:
The training mode does not
match the training mode used
by the DSLAM
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