A DLM reset on FTTC will only reset it to mirror whatever the sync is upon resetting.

In reply to a post by Westyfield2:

So my plan now is to leave it for a couple of weeks and see what happens before reporting the fault.

Assuming this is crosstalk and not some other noise issue, I was the first on this cabinet (and it's the first cabinet on the exchange) so I was expecting speeds to dip slightly after a while when more customers signed up and crosstalk kicked in.

But surely this can't be right? It lost 25% of speed in one hit!

it happens.

I had 2 large hits.

from 110 down to 90. then from 90 down to 73. Just unlucky where your cable is positioned in the bundle and the neighbour who got activated was on a disturber pair.

There is a chance there is a fault somewhere that has made the crosstalk amplified, or a fault has started as a result of the installation, a while back robertos posted once he seen a engineer at a cabinet and that engineer only had to slightly touch pairs to cause disruption to service so pairs can be very fragile. But I think openreach wont look for a fault if you above the estimated speed.

The fact you were early on the cabinet means you were more likely to see such a large drop as you started of in a single pair environment. If you were installed later you would start off on the lower speed and be happy I guess.

I have had FTTC for about 18 months. During that time my max attainable has fallen from 102 to 82Mbps. The most recent fall was last week at about 4am. I suspect that the problem was increased noise due to local storms. My modem log is showing that INP has increased from 0 to 3 on the down side of my line (interleaving kicking in?). When this has happened before, I have just sat back and waited for the system to do its thing. As many have noticed this can take weeks rather than days. All that said, I am fortunate that I still have speeds above 80/20 so there has been no change in my profile. I can well appreciate that for those who live some distance from their FTTC cabinet, this process can be extremely frustrating.

So I've now left it for 4 weeks� things haven't improved.


Just to recap, I'm now (for the last four weeks) getting a speed of 39Mb/s - compared with the original speed of 54Mb/s. That's a loss of 28% according to my maths. For reference, the provided estimate when signing up (and still on wholesale checker) is 51.5Mb/s.

I'd like to get this investigated, even if it turns out to be "Crosstalk, sorry nothing we can do about it" I'd like that confirmed to know it's not some other line fault or noise problem that could be solved!

Remembering that coincidentally next door had an OpenReach van round on the day my drop happened four weeks ago, I asked them... they confirmed they had various phone & internet problems but didn't know if their internet was Fibre/FTTC/Infinity (I got the feeling we're the geeky house and not them!)

Soo� what's my best bet on how to get BT Retail interested and pass it through to OpenReach?

I know the feeling. 62 down to 46 here. The ISP are fantastic with helping out but ultimately the bit of wire is BTW and they (and even forum users) will likely just shrug and pass it off as crosstalk.

Looking forward to this vectoring thing as it'll hopefully blow that excuse out of the water