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[Weaver]

The lines #1, #2, #4 have all resynched at slightly slower speeds when I forced a retrain on each one, thus achieving the the opposite of my intention; so I shot myself in the foot - duh. This is ~7% speed reduction on these lines. Line #3 has not been restarted; it’s running much faster than the others. I’m wondering why the small reduction might suddenly have happened. I know that these things sometimes ‘just happen’ but the lines are normally very consistent. There are two cycles: day-night cycle and the winter-summer cycle, the former in each case being the faster. So I’m wondering if this is the start of ‘summer’ because it’s much warmer today than yesterday and the strong breeze has gone. Janet thinks it could be as high as 9℃ / 10℃ today; Apple Siri thinks it’s 8℃ this afternoon.

Live sync rates:
  #1: down 2887 kbps, up 522 kbps
  #2: down 2788 kbps, up 515 kbps
  #3: down 3100 kbps, up 399 kbps
  #4: down 2810 kbps, up 525 kbps

What do you think? Is this the summer-winter effect that we’ve discussed in previous years?

[burakkucat]

It might be the case, yes.

[displaced]

Yep - had a bunch of resyncs over the past few days. Down from ~59MBit/sec to 54.  Also seeing a corresponding rise in attenuation. 18.5 in the depths of winter, now 20.5. Reaches 21.5 in the height of summer.

I think that the longer your lines, the more pronounced is the seasonal effect - less line performance headroom, and physically more copper to expand and contract.

[noddy]

I'm waiting for my summertime effect  ( the annual turning on of the fences  )

[noddy]

And it's here two days ago , the average error count per hour is now 1300 - 1500 approx

[Weaver]

That’s a real nuisance. My big reduction now though is a one-off, my line 4 dropping from 3 Mbps to 2.4 Mbps d/s sync Because of increased noise pickup on the downstream only, in a certain frequency range, tones 40 to 82.