You can find the SHDSL Diagnostics at Diagnostics → Interfaces → SHDSL.
Here you can see the current settings and status of your SHDSL setup.
To change your SHDSL setup please go to Interfaces → Assign → SHDSL and refer to the documentation at SHDSL.
You can see the current configuration that is active, the status if the modem is connected and the connection data (PAM/Speed/SNRM/LATN).
You can also see all performance counter like CRC errors. NE is always the local errors and FE the foreign errors if available.
The different counters are:
SNRM – Signal to Noise Margin
LATN – Line Attenuation
PBO – Power Back-off
ES – Errored Seconds
SES – Severe ES
AUS – UnAvailable Seconds
LOSW – Loss Of SyncWord
CRCa – Cyclic Redundancy Check
Clear Stats allows you to reset the performance counter.