What speed estimate were you given when you ordered from Plusnet?
What speed estimate ranges (both A and B) do you get by putting your phone number in here:
What speed estimate ranges (both A and B) do you get by putting your postcode into the address-checker here, followed by selecting your actual address from the subsequent dropdown list:
It is worth knowing these numbers to judge the rest of the data against. You might also want to check whether your neighbours get similar estimates.
When you perform the last two tests, the screen should identify the exchange name and cabinet number. Can you let us know those?
On installation day I was syncing at around 25mbps. Now i seem to have dropped to around 21.8mbps, having tried in the master test socket its around 21.9mbps so fairly sure the data extension is having no major effects.
First, please understand that FTTC suffers more from an effect known as crosstalk than ADSL did; crosstalk is noise induced on your line from other FTTC subscribers. As take-up increases, crosstalk increases, and speeds drop somewhat.
So, annoying as it seems, sometimes we can do nothing about the drop in speeds. This is why BT provide a range - and we should expect variation within that range.
6. Data rate: 2000 / 22398
7. Maximum data rate: 3362 / 26504
8. Noise margin: 7.3 / 6.4
9. Line attenuation: 31.0 / 28.7
10. Signal attenuation: 30.9 / 25.4
The statistics here are something of a bare minimum, and don't help us identify whether any problems are going on.
SNR is always set to target 6dB, and should only be higher when your sync speed is already the maximum.
31dB attenuation is quite high. Do you know how far from the cabinet you are? I'd guess at a line length of more than 1km.
Anyway, the fact that your "actual sync speed" differs from your "maximum sync speed" by around 20% suggests that DLM has intervened on your line because of the error rate, and has turned on both interleaving and forward error correction (FEC) as a means to reduce the error rate. Unfortunately, this reduces your sync speed (usually by between 10% and 20%, but sometimes more) and increases latency (by 8ms or more).
Have you noticed any difference to latency?
This kind of DLM intervention used to be common on all types of line, but BT has introduced new error protection mechanisms on *some* of the cabinets (ones made by Huawei) known as G.INP, or re-transmission, which doesn't have the same impact on speed.
That means we can't be sure whether your really have suffered intervention in this way without knowing what type of cabinet you are connected to.
If DLM has intervened, the usual first recommendation is to start monitoring the line statistics - but I'm not sure if you can do that with the Hub One.
Sometimes I do hear a slight crackle on the line during calls and wondered if this is something that can be fixed at all? To be fair we had a few issues with our line over the years and the bt test always used to say 'High Loop Resistance' whatever that may mean! Even on ADSL when my line was supposed to be 7mbps we struggled to 5mbps.
They're all indications that suggest some form of problem on the line, that could, in turn, cause enough errors to have caused a DLM intervention.