By the most likely road route I live 3km from the exchange (2.74 SamKnows). For some unknown reason BT, after a repair to the cable near my house, set my target SNRM to 3. As a result I got extremely high sync ~9000 kb/s in the day, but at night would drop by about 800+ kb/s. No worry that!
By chance I needed to disconnect and reboot yesterday to accommodate Erin Dors's housewifely desires.
Fluke!? The connection has held as here
Link Information
Uptime: 1 day, 0:35:30
DSL Type: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 440 / 8,897
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.5 / 0.0
Line Attenuation (Up/Down) [dB]: 25.0 / 46.0
SN Margin (Up/Down) [dB]: 20.5 / 2.5
Vendor ID (Local/Remote): TMMB / IFTN
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): 9 / 0
FEC Errors (Up/Down): NA / 31,128,606
CRC Errors (Up/Down): NA / 1,269
HEC Errors (Up/Down): 0 / 1,097
Another funny is that until a week or so attenuation was 47dB: now 46dB. Bandwidth used may also have increased slightly
Could it be that FTTC run out or other changes have unexpected effects on normal ADSL2/2+ lines?