Our local school has switched to CallPlus from SchoolZone on another line and don't seem to be getting the speed you would expect. Line stats are fairly decent, e.g.

Line Rate
7616 Kbps
832 Kbps

Attainable Line Rate
10496 Kbps
1056 Kbps

Noise Margin
20.4 dB
14.0 dB

Line Attenuation
5.0 dB
4.0 dB

Output Power
9.8 dBm
11.9 dBm

and after a port reset last night interleaving has been turned off so pings are under 20ms for NZ speedtest.net sites.

Upload speeds are what you would expect, about 0.70Mbps but download speeds rarely break 1Mbps (though last night a couple of tests went through 2Mbps but I haven't seen that happen the few times I've checked in over the past week or so, and haven't seen it again). Speeds in the village are normally in the range of 3.5-4Mbps, ISPs delivering those sort of speeds include Telecom, Orcon and Xnet.

Something that I was wondering about is their wiring. They had a master splitter installed but did not get a dedicated jack point at that time. After a bit more to-and-fro-ing they got a dedicated jack but I'm wondering if it actually is, as when I went in the router was plugged in via a standard ADSL filter. I wasn't around for either of those installs and I'm wondering if that seems a little weird? The router works either plugged in to the filter or not (running the Slingshot speed test was actually a little slower without the filter), and again the line stats seem OK.

Does anyone have any insights they'd like to add?

edit: line stats table didn't survive post formatting.