Pathetic speeds and unreliable Connection

Hi
I have been having pathetic speeds and an unstable connection on my BT broadband since the start of 2010 I suspect this coincides with the roll out of 21CN on my local exchange. I use BT to mainly talk to my famly over skype but since the start of 2010 the quality of calls has gradually gone downhill and it became almost impossible to use my broadband connection in august when it would randomly disconnect and the audio and video quality on skype became utterly pathetic.
On talking to indian call centre, I got told that my router was faulty and since my contract ran out in august, I need to sign up to a new contract to recieve a replacement router. on signing up to a years new contract on 2nd September and going with the ussual hassle of a few weeks delay in getting the router and arguing with the indian call centres to get the router sent as they delibrately cancel the router delivery after making the sale, when I eventually got the router the broadband was no better, I complaining further to BT I got told there is a fault at the exchange which they'll fix and the broadband speed would go up. Guess what nothing happened to the speed. In 2009 the typical speed on my connection according to speed test used to be 5.5 Mbs up and 500kbs down now I was stuck with 3Mbs and 270kbs and then things took a turn for worse in the last week of October the speed went down to 50kbs (down) on checking with bt speed test, I found my IP Profile was limited to 65kbs. I called up BT to complain again this time they decided to send and engineer over to my house who while doing the test casually told me that line doesn't have any problems but even though you should be connected at ADSL2+ none of my checks confirm this is the case the switches may be ADSL2+ but the backend is not connected. Now I don't know what to make of this except may be say BT is cheating with its customers.
Please free to make suggestions to help me, my router stats are:
ADSL line status
Connection information
Line state Connected
Connection time 0 days, 0:43:43
Downstream 4,188 Kbps
Upstream 612 Kbps
ADSL settings
VPI/VCI 0/38
Type PPPoA
Modulation ITU-T G.992.5
Latency type Interleaved
Noise margin (Down/Up) 14.1 dB / 4.2 dB
Line attenuation (Down/Up) 52.0 dB / 29.4 dB
Output power (Down/Up) 18.8 dBm / 12.4 dBm
Loss of Framing (Local) 39
Loss of Signal (Local) 80
Loss of Power (Local) 0
FEC Errors (Down/Up) 3152 / 3
CRC Errors (Down/Up) 64 / 2147480000
HEC Errors (Down/Up) nil / 89761
Error Seconds (Local) 2
and the latest BT Speed tester results are as follows :
Thanks
Zuhair

Hi Zuhair,
Thanks for posting. I can check what's going on with the connection. Drop me an email to the address in my profile wwith your account details and a link to this post for reference.
Cheers
David
BTCare Community Mod
If we have asked you to email us with your details, please make sure you are logged in to the forum, otherwise you will not be able to see our ‘Contact Us’ link within our profiles.
We are sorry but we are unable to deal with service/account queries via the private message(PM) function so please don't PM your account info, we need to deal with this via our email account :-)

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    This image shows quite well how, over a 6 day period, BTs DLM noticed that my line fault was fixed. I didn't get the full speed back for a week. 
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    >> Yes, if you resync / power cycle your router multiple times in a day it is likely to try and "combat the line errors" and reduce your sync rate by increasing the SNR and / or interleaving on the line. 
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    >> PPP drops (router reboots while leaving the BT Openreach VDSL modem on and connected) won't affect DLM. The IP profile will match your sync rate upon reconnection of the PPP session. 
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    8) Can the sync rate change dynamically without a reconnection? If the ip profile gradually rises, will the cabinet force a resync to make sure the customer is actually getting the benefit of the higher ip profile, or must the user intervene with a modem resync? 
    >> See above - Sync can rise without affecting the IP Profile and the cabinet does not force a RE-PPP. 
    8) As I understand it, if the ip profile gets stupidly low for some reason, it can only be reset by BT wholesale? This will only be done after a visit to your home and a telephone call from the engineer to the BT wholesale central admin? 
    >> Mixed reports plus I don't think people understand the difference between sync speeds, line faults, the delay in DLM increasing sync after a fault.. I expect half the reports on the BT forum are not related to a stuck BRAS / IP profile. It is possible for the ISP or a BT engineer to reset the IP profile and possibly DLM training. 
    9) (8) This applies to all ISPs using BT Wholesale: some may be more willing to force this process to happen on behalf of their customers, but none can cirumvent it? 
    >> GEA providers (I believe) still have DLM but don't have BRAS / IP profiles unless they implement their own. 
    10) Who sets the snr? As I understand it, the customer has no direct control. Is this different for different ISPs? 
    >> Mixed information again, I believe that BT Wholesale give providers DLM override controls and SNR settings but none? (or few) ISPs use this system. 
    11) Real download/upload speeds are physically limited by the sync rate. They are also naturally limited by local limitations (such as wireless connections), server limitations, and congestion at various points along the route? Any more? The congestion along the route will vary bewteen ISPs as they use different routes with different capabilitues. 
    >> It is possible for BTs regional or local cabinet network to become congested. Supposedly the minimum speed you should achieve over the BT part of the network is 15mbps. ISPs such as Plusnet, BT etc.. then layer their own "discriminatory" traffic management on top of that (ie, slow down torrents etc.). 
    12) Real speeds are 'unnaturally' limited by throttling. This will also vary from ISP to ISP. Sky claims to have none, and BT none except for p2p. PlusNet and John Lewis have significant (but well explained)throttling. All the more expensive operators have none. 
    >> What you said  
    13) The ip profile affects the sync rate, and therefore actual speeds. Does the ip profile effect actual speeds in any other way? 
    >> Not quite right. The IP profile directly affects the speeds you can achieve but the sync rate affects the IP profile. The sync rate is determined by the stability and quality of your line and what DLM thinks it can cope with. 
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    >> AndrueC and some other Sky customers have strange symptoms where speeds are around 20mbps rather than the full sync speed. The only logical explanation is either local cabinet congestion, contention between BT and the provider's network (not enough investment by the provider) or artificial traffic management on the providers side. It is also possible that the router that the customer has attached to their line is unsuitable for the higher speeds. For example an old ethernet router may only be able to cope with 20 or 30mbps! A friend of mine has a TP-Link ethernet router running Tomato on a BT 80mbps service but the TP-Link's CPU limitation causes his service to only perform at around 68mbps; he has a replacement router on order. (Obviously wifi will significantly reduce performance). 
    15) If you get a stupidly low ip profile, how long can you except it to take before it climbs to something more reasonable? (eg in my particular case, my profile is currently around 15Mb, and from BT service line tests should be around 58Mb). And the classic question, is it best to power cycle the modem (1) never, (2) occasionally (how often) or (3) never if at all possible? Mine did jump from 3.5Mb to 15Mb on one power cycle. Was that just coincidence? 
    >> My FTTC line took about 6 to 7 days to go from 40mbps to 80mbps after a line fault. It is possible that your 3.5mbps to 15mbps increase was the "re-ppp" affecting the BRAS profile and that your sync had slowly been increasing over time. 

    what a waste of money sending an engineer to "fix a fault" which does not exist.  Precisely.
    In my original BE post to which Tom so helpfully responded, I began:  It seems to me that DLM is an excellent concept with a highly flawed implementation, both technically and administratively.   I think that sending out an engineer to fix an obviously flawed profile is the main example of an adminastrative flaw.  I understand (I can't remember source, maybe Tom again) that they are sometimes relaxing the requirement for a visit before reset.
    Maybe the DLM system is too keen on stability vs speed.  This will keep complaints down from many people: most users won't notice speed too much as long as it is reasonable, but will be upset if their Skype calls and browsing are being interrupted too often.  
    However, it does lead to complaints from people who notice the drops after an incidence (as in your thread that has drawn lots of interest), or who only get 50 instead of 60.  The main technical flaw is that DLM can so easily be confused by drops from loss of power, too much modem recycling, etc, and then takes so long to recover.

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