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Seems odd after resync caused by upstream event

Luzern
Seasoned Pro
Posts: 3,381
Thanks: 351
Fixes: 3
Registered: 31-07-2007

Seems odd after resync caused by upstream event

Quite recently the upstream SNR took a mighty dip from a steady ~10 dB to almost 0 and sync was lost. Recoverywas to ~8 dB. Downstream SNR before and after the event was ~3dB. Prior to the event sync was 8178 /888; after 8215/656 kbps.
Is there some relationship between down/up syncs and down/up SNR, and why am I seeing a small rise is downstream speed and a somewhat larger drop in upstream?
No one has to agree with my opinion, but in the time I have left a miracle would be nice.