Exchange "network upgrade" has reduced my speeds

My exchange has just had its "network upgrade" (according to the emails I received) and I would be grateful for some technical info. I presume this is 21CN (router says G.992.5 annex A).
I'm using a HHub 1.0. I haven't taken any action myself about any upgrade or new contract. I'm out of contract at the moment, on the old Option 3 Broadband with BBTalk and BTVision (no packages).
The exchange work was done about about a week ago according to the email, although there were internet connection problems for a fortnight before that. It's halved my IP and download speed. I only discovered that was the problem when I got the upgrade emails.
1 - how long does it take to settle down after the inbterference of the conversion?
2 -Is there anything I can do to recover what used to be a good solid synch under my old ADSLMax, at double what I have now? (I used to get an IP solidly above 5000 and very stable connection)
3 - does the IP profile and synch rate adjust on its own (with 21CN) , without restarting the router or reconnecting the line or should I try a restart every couple of days? Which will give me the best chance of getting a better IP profile over time?
4 - Do IP profiles get "stuck" on 21CN like they sometimes did on ADSLMax?
Does anyone have any technical data references about 21CN - presumably all my current BRAS profile/IP Profile tables are now out of date?
What sites have good information and support on this please? (preferably 3rd party ones).
Hub stats here
DSL Connection
Link Information
Uptime:
0 days, 0:09:01
Modulation:
G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]:
711 / 3,643
Data Transferred (Sent/Received) [KB/KB]:
165.00 / 225.00
Output Power (Up/Down) [dBm]:
9.5 / 0.0
Line Attenuation (Up/Down) [dB]:
11.0 / 23.5
SN Margin (Up/Down) [dB]:
10.5 / 19.0
Vendor ID (Local/Remote):
TMMB / IFTN
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
Loss of Link (Remote):
0
Error Seconds (Local/Remote):
0 / 0
FEC Errors (Up/Down):
0 / 0
CRC Errors (Up/Down):
32 / 0
HEC Errors (Up/Down):
7 / 0
Line Profile:
Fast
and speedtest results here
Test1 comprises of Best Effort Test: -provides background information.
Download Speed
2357 Kbps
0 Kbps
7150 Kbps
Max Achievable Speed
Download speedachieved during the test was - 2357 Kbps
For your connection, the acceptable range of speedsis 1000-7150 Kbps.
Additional Information:
Your DSL Connection Rate :3643 Kbps(DOWN-STREAM), 711 Kbps(UP-STREAM)
IP Profile for your line is - 2500 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 12.81:20.07:67.12 (SBE:NBEBE)
These figures represent the ratio while sententiously passing Sub BE, Normal BE and Priority BE marked traffic.
The results of this test will vary depending on the way your ISP has decided to use these traffic classes.
Many thanks in advance for any assistance.
My broadband secrets and tips

imjolly wrote:
It is an upgrade to 21CN - you can check profile here http://www.kitz.co.uk/adsl/IPprofile.htm It's like starting again - 10 training period. apart from increase eventually in speed/download it is basically the same procedure.
Thanks - that is the table I was looking for, and I'm assuming it still applies to 21CN.
According to the table on that link then, I should see a profile increase, as my last synch (3643/711) was above the upper range (3392) for my current profile (2500). My last throughput was 2357.
I'll try and be patient and wait!
Unanswered question - does the higher rescynch and hopefully IP profile increase, happen without a user router restart?
Anyone know WHAT the 21CN upgrade actually is? What it entails? The available BT information is incredibly vague? Seems to be about babies reaching for the sky and world class consumer experiences.
http://www.btplc.com/21cn/whatis21cn/index.htm
Haven'tt seen any babies and the experience so far has been sloooooooooooow.
I think I got the version with the guy juggling.
http://www.btplc.com/21cn/
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Exchange "network upgrade" has reduced my speeds

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