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[MonkeyRed]

Hi all,

I've done a reasonable amount of reading on the both this site and the forum and hopefully answered many of my questions myself.

My current connection is as below. I'm lucky enough to live less than half a mile from the exchange. 2 or 3 months ago we got a speed upgrade from BT from 8mb to 20mb, but i have never seen more than 8mb. Unfortunately i can't plug into the master test socket to check my wiring as i have an old master socket which has no inner test socket. I've tried calling BT who say according to their systems i should be on 7.5mb. As far as i can tell my Attenuation looks good but i'm less sure about the Noise margin?

Any help or suggestions would be most gratefully received.

Many thanks - Chris

Current DSL Connection:
Down   Up
Rate:   8125 kbs   431 kbs
Max Rate:   20133 kbs   1152 kbs
Noise Margin:   22.2 dB   28.9 dB
Attenuation:   13.8 dB   4.6 dB
Output Power:   18.1 dBm   12.2 dBm

Protocol:   G.DMT2+ Annex A
Channel:   Fast
DSLAM Vendor Information   Country: {46336} Vendor: {IFTN} Specific: {47473 }
ATM PVC:   0/38

Rate Cap:   20133 kbs
Attenuation @ 300kHz:   13.8 dB
Uncanceled Echo:   -22.0 dB   Ok
VCXO Frequency Offset:   -3.4 ppm   Ok
Final Receive Gain:   -4.1 dB   Ok
Impulse Noise Comp. Tones:   0   Ok
Excessive Impulse Noise:   0   Ok

[Oranged]

The downstream SNRM is very high.

If you haven't already then can you run the test on www.speedtester.bt.com and post the results back here ?

[MonkeyRed]

Hi Oranged,

Thanks for getting back to me - i ran the test a couple of days ago but can't seem to find the results. I will run it again and post them up. Thanks for the help.

Chris

[MonkeyRed]

Hi Oranged,

Ran speedtester again, results are as follows:

 Download speedachieved during the test was - 6985 Kbps
 For your connection, the acceptable range of speedsis 1000-7150 Kbps.
 Additional Information:
 Your DSL Connection Rate :8125 Kbps(DOWN-STREAM), 430 Kbps(UP-STREAM)
 IP Profile for your line is - 7000 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 15.23:23.46:61.3 (SBE:NBE:PBE)
These figures represent the ratio while sententiously passing Sub BE, Normal BE and Priority BE marked traffic

[Oranged]

Well those results are OK for the sync rate of your router but although the indications are that you are on ADSL2+ (Protocol:   G.DMT2+ Annex A) the actual status is that you're not.

The BT speedtester results are what you would expect an Max IPStream rather than WBC.

The problem is almost certainly the 22.2dB SNRM that is preventing the router syncing at perhaps maximum for a WBC connection which should provide an IP Profile of 17,000kbps rather than the 7,000kbps that you're on.

Perhaps somebody else will be along soon who will be able to provide a solution for you as I don't know too much of how the BT WBC system functions.

[HPsauce]

It all smells of an artificially limited rate. 

What router do you have and is your ISP BT?

[waltergmw]

Hi MR,

I suggest it would be well worth taking a look inside your old master socket.
You might find you still have ring wires connected so it would be a good idea to remove them in any case.

We just had a very similar request which you'll see here:-

http://forum.kitz.co.uk/index.php/topic,7479.0.html

This user also has an older type master socket as you'll see in the first picture.
You too should remove all wires carefully other then those on pins 2 and 5.

Kind regards,
Walter

[MonkeyRed]

Hi All,


Oranged – Many thanks for helping again. What you have said seems to fit perfectly with my basic understanding that nothing seems to have changed since the move from 8mb to 20mb.

HPsauce – Thanks for your input. 2 Wire BT 2700HGV (BT business hub). I have two of them which are identical. I have tried both of them and also tried different filters and adsl leads to check it is not hardware related. Yes my ISP is BT.

Walter – Many thanks for finding that post for me. I did try and look for something similar in terms of posts but everyone seems to use different terms that it seems hard to search for what you’re looking for. I’ve removed the ring / bell wire this morning and also removed the remaining extensions. Luckily we have CAT 5 so I am able to route the phones from the main / master socket without needing phone extensions. This seems to have improved the Attenuation, I have run speedtester as well and both results are below:

Thanks all – Chris

Modem Type:   Built in modem - ADSL
DSL Line (Wire Pair):   Line 1 (inner pair)
Current DSL Connection:         
   Down   Up   
Rate:   8125 kbs   431 kbs   
Max Rate:   21049 kbs   1132 kbs   
Noise Margin:   23.6 dB   28.4 dB   
Attenuation:   12.1 dB   4.5 dB   
Output Power:   18.3 dBm   12.2 dBm   
         
Protocol:   G.DMT2+ Annex A      
Channel:   Fast      
DSLAM Vendor Information   Country: {46336} Vendor: {IFTN} Specific: {47473 }   
ATM PVC:   0/38      
         
Rate Cap:   21049 kbs      
Attenuation @ 300kHz:   12.1 dB      
Uncanceled Echo:   -22.7 dB   Ok   
VCXO Frequency Offset:   1.2 ppm   Ok   
Final Receive Gain:   -8.1 dB   Ok   
Impulse Noise Comp. Tones:   0   Ok   
Excessive Impulse Noise:   0   O   

Speedtester Results

Download speed achieved during the test was - 7649 Kbps
 For your connection, the acceptable range of speeds is 1000-7150 Kbps.
 Additional Information:
 Your DSL Connection Rate :8125 Kbps(DOWN-STREAM), 430 Kbps(UP-STREAM)
 IP Profile for your line is - 7000 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 16.98:23.91:59.11 (SBE:NBE:PBE)
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

[MonkeyRed]

One further point - i presume i should continue to follow the golden rule of not rebooting the router in an attempt to improve things and just leave it powered on as i have been doing?

Thanks

[HPsauce]

It all smells of an artificially limited rate.  

It doesn't smell any more - it stinks to high heaven.  

Something set by BT is almost certainly restricting the speed.

(The max rate data shows pretty accurately what it COULD be running at)

[MonkeyRed]

Thanks HPsauce - Presumably then the issue is with BT. Is the best approach to call them and just keep badgering for technical support?

[waltergmw]

Gentlefolk (Esp azzaka),

We need to find out if a BT customer can demand that a retrain be done on a known mal-performing ADSL2+ broadband service.

@ MR I suggest you should request that BT do this and see what happens.

Nice to know you've got Cat 5 and presumably an IDC insertion tool.

Kind regards,
Walter

[MonkeyRed]

Walter,

Thanks for helping again. Cat 5 - yes very handy. Not got or needed an IDC insertion tool yet, perhaps i need one?

Is a retrain what i need to ask BT for? I'm on BT business if this makes a difference. I'm quite happy to call them but if possible could anyone shed any light on whether BT will help? I'd like to be forearmed with as much information as possible.

Thanks again - Chris

[HPsauce]

Is a retrain what i need to ask BT for?

I'm not sure if that is the solution, I don't think you have an artificially high target SNRM due to errors.
Your SNRM is a side-effect of the rate being limited on a short line that is capable of so much more.

I suspect that somewhere someone in BT hasn't changed an appropriate setting and that you line is configured to have ADSL1 limits, though I don't know what you have to say to get them to acknowledge and correct that misconfiguration.

So yes, you need to be firm and insistent with BT support - business service should make that easier.

Are there any ADSL2+ LLU operators on your exchange that could provide a suitable service. Many don't provide full business class though, depending what you need.

[waltergmw]

Hi MR,

I'm referring to the facility Kitz describes here:-

http://forum.kitz.co.uk/index.php/topic,6046.msg133908.html#msg133908

But I'm not yet sure if that facility is available for the new ADSL2+ services.
However  I see no reason why you shouldn't go into "Disgusted of Tunbridge Wells" mode and firm request that BT sort this one out for you !

EDIT to add:-

 I agree HPsauce,

But it's just trying to find a handle to make BT sit up and take notice.

Kind regards,
Walter