said by Robert1010:I am using win7 64bit, I think the rwin and mtu are set by the operating system. ... The old overhead was 1164Kbps.
That was my impression too, and it's has been years that I've looked at connection optimization. However, I noticed that the latest version of the tool from SpeedGuide is now Win7 compatible too. It might be worth a look at the current MTU and Rwin settings as I think packets are being dropped within your network causing your slow throughput. It should be closer to ~1350Kbps or higher--max of ~1500Kbps .
How far are you from the CO? Is the 61dB consistent with the actual distance? Take a look at this as a rough guide:
»
www.speedguide.net/dsl_s ··· calc.phpAs to your other questions, I'll leave that to more knowledgeable readers to respond...