All the above was with a Cisco 857 dsl/modem. So over Xmas holidays, I found latest firmware for the problem above and also a crafted firmware for special use with BT's kit at the exchange. All worked great for a day or so, but then I started to get disconnects in the evening and early morning - and every time that happened, modem would resync about 2000 LOWER, and IP Profile dropped accordingly (until I ended up sync'ing around 1500). But no matter what I done, I could never get a decent sync back. Checking with the BT speed test, it turned out that after every disconnect my sync rate got 'capped', so no matter what I done, I was stuck on a low connection speed.
My ISP, Enta have been very good, and we tried everything (reset this, reset that etc.). Same problem.
So clutching at straws I bought a TP-Link adsl modem/router, got eveything reset and off we go.
Yesterday, I was connected at 5420, with decent noise margins, IP Profile of 4500. Hunky Dory!
Then last night, I got a disconnect, now can only resync at 3000. BT speedtest thing reports my line is now only capable of 4Mb, and my profile is now 2500.
I can be sure that it will disconnect again tonight some time, and my sync will drop to around 2000, profile will drop to 1500, and max line speed will drop too.
So, why do BT cap the sync speed? How can the 10 day training period work it they cap what my line can do?
Here are my latest stats:
Line Status:Connected DSL Modulation Type:ADSL_G.dmt.bis Annex Type:Annex A/I/J/L/M UpstreamDownstream Current Rate (Kbps) 1128 3070 Max Rate (Kbps) 1128 9424 SNR Margin (dB) 5.9 17.4 Line Attenuation (dB) 22.4 39 Errors (Pkts) 0 0
Two things to note: I connect using ADSL2, as 2+ is not worth it on my line length (about 3km). I have checked all wiring, filters etc.
Any help appreciated why this all started happening, and why now BT seem to 'cap' connection speeds which to me seems to do away with the way the profile thing works.
Edited by Lethe (Tue 19-Feb-13 10:57:36)