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[Alex Atkin UK]

If you are in sync then yes, generally its gradual.  For example on my very short copper line:

12:00

Code: [Select]

Max: Upstream rate = 31461 Kbps, Downstream rate = 91304 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 79987 Kbps

Down Up
SNR (dB): 9.3 14.0
Attn(dB): 14.1 0.0
Pwr(dBm): 13.8 5.1
0:00

Code: [Select]

Max: Upstream rate = 31986 Kbps, Downstream rate = 91544 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 79987 Kbps

Down Up
SNR (dB): 9.4 14.6
Attn(dB): 14.1 0.0
Pwr(dBm): 13.8 5.1
I would imagine on a longer/partly alu line the difference will be considerably magnified.

Of course if you trigger a re-sync then the change can be dramatic as the modem has completely recalibrated.  At these sorts of speeds just re-syncing can easily be a Megabit difference either way.

[Chrysalis]

I think it was either crosstalk from someone turning on their modem or new electrical interference.

Living in a highly populated dense area I guess means I am going to have tons of these sort of issues.