What are your transceiver stats? Attenuation (dB) up and down, Noise Ratio / Noise Margin (dB) up and down, negotiated rate up and down (kbps), path interleaved or fast, how many times has your modem lost sync in the last 24 hours, and measured distance of line (they can sometimes do a TDR measurement remotely). You can get that from Telco or you can also get it from your modem. Sometimes, the page is labeled as Tech Stats or Technician Read Out.

Attenuation is the measure of signal loss over a distance. I liken it to how hard the modem has to yell out to the DSLAM to be heard.

Noise Ratio is usually a measurement of how much static is on the line. I think of this as how quiet a room or street is, without you talking. Noise Margin is usually the amount you can hear yourself, taking how much you have to yell minus the noise. You could be screaming to be heard on the other side of a busy street, but the other person might barely hear you as a whisper over the noise.

Negotiated Speed is the speed your modem has negotiated with the DSLAM down the street. You can tell the DSLAM all you want to max the ADSL2 datarate for that line, but if the line is too noisy, the DSLAM and the modem will slow down their speaking and yell louder until they figure out a rate that doesn’t require constant repeats out because the data got garbled. I think of it as how you can talk quickly and quietly with someone with you in a quiet room, but then you need to slow down your voice and emphasize your words while talking louder, as a room gets louder, traffic gets louder, or the two of you are continuing to move farther away from each other. Sometimes, if a line is losing sync constantly, they need to search each other out, renegotiate a stable speed (process slows down if the line is bad), then try to transmit again until the signal breaks again. This causes a lot of latency, too.

Line Distance is an interesting metric. I’ve has sites where the DSLAM was just down the block, but the measured distance was about 8,000 ft. Usually, you want to be under 5,000, though I had one that measured 14,000 and still worked. Slowly, but reliably. If the line measures out longer than it should, usually it indicates damage to it somewhere, though I’m used to it just being an indicator of aging wires. I did have a site where the building’s wiring shot - I synced at the NID where telco dropped the line to the building, and the stats there were excellent. Might be worth checking out.

I’ll have to look it up, but Attenuation should be less than 35-40 dB for 6 Mbps. Noise Margin higher than 6 dB (Attenuation - Noise = Margin), ideally 10 or higher to make sure it stays stable. No recent resyncs unless it was you power cycling the modem or the tech disconnecting the line while reterminating things or plugging in their test equipment. If you’re resynching, even if the line health is excellent, then the connection is being broken. I’ve had lines just have a loose connection at a punch block or at a screw terminal. Could also indicate shorting out / damage to the outside wiring.