Attached is a snapshot from RouterStats last night. You can see that there were 5 sudden drops in SNR at around 02:30-02:45. Unsurprisingly this caused quite a few CRC errors and today there is an overall drop in SNR margin of about 2dB.
Is this what one would expect to see from time to time on a 7km line (63.5dB attenuation) or is this an indication that the line has a possible fault?
Stats from my Speedtouch.
Uptime: 2 days, 5:36:56
Modulation: G.992.1 Annex A
Bandwidth (Up/Down) [kbps/kbps]: 448 / 1,920
Data Transferred (Sent/Received) [MB/MB]: 64.83 / 681.31
Output Power (Up/Down) [dBm]: 11.5 / 17.0
Line Attenuation (Up/Down) [dB]: 31.5 / 63.5
SN Margin (Up/Down) [dB]: 6.0 / 6.0
Vendor ID (Local/Remote): TMMB / ALCB
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 513 / 0
FEC Errors (Up/Down): 0 / 97,940
CRC Errors (Up/Down): 0 / 2,552
HEC Errors (Up/Down): 0 / 2,020