I'm pretty sure there's a fault on the line, but I'm not sure on how best to tackle it. The following happens when connected to the test socket as well as the normal front of master socket:
When the phone rings I get Upstream HEC errors and CRC errors and the "Error Seconds" count increases. The errors keep increasing until I answer the phone, but once answered they stop increasing. Also when the phone rings the downstream noise margin drops, but unlike the errors this stays lower until I hang up.
I've uploaded a picture of the graphs here
Downstream: 1.656 Mbps
Upstream: 448 Kbps
Noise margin (Down/Up): 6.0 dB / 15.0 dB
Line attenuation (Down/Up): 60.1 dB / 31.5 dB
Output power (Down/Up): 17.9 dBm / 12.6 dBm
A bit of background:
When the line was installed last year (new build property) the openreach engineer installed the master socket where the developers had intended. I had trouble with broadband and got an engineer out who noticed the master socket was wired to an extension, and so moved the master socket to the right place. He also replaced the master socket with one with a built in filter. So I don't have great confidence in the internal house wiring from the developers.
I've tried taking the front of the master socket off and trying all extension points to make sure that the master socket is wired directly to the incoming line, and given none of the extensions work i'm assuming this is the case.
So my questions are
1) I'm assuming the errors aren't normal, but is it normal for the downstream noise margin to drop while on the phone?
2) It seems odd that the errors are only on the upstream, but the noise margin drop is only on the downstream. Is this odd?
3) Could this be an external fault, or is it more likely to be a problem with the internal wiring from the outside to the master socket?
4) If it's likely to be an internal wiring fault, would BT still be liable for this as it's their side of the master socket?
5) Should I report this as a broadband fault or a line fault?
Sorry for so many questions, any help would be much appreciated