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Message 1 of 7

Broadband very slow and occasional dropping in signal

Over the past few months I have noticed the Broadband gradually becoming slower and slower.

I have tried the usual tests; resetting, rebooting etc. 

The main socket is in the attic but we have always used the main phone socket in the study for phone and broadband and experienced no problem.


I have a BT Hub 3 with a Non NTE 5 face plate.


ADSL in my local exchange (SWLDR).(psotcode SA32 8AN)

Then I swapped over to a cordless phone and the service deteriorated from there.

The connection seems to intermittently drop and I have a flashing orange light. That has appeared to settle since we reverted to the old corded phones. I've tried new filters too and BT customer care have had a look sevreal times. I've ran all the tests -to no avail.

For a few days when I made an outgoing call I noticed the brraodband light was flashing orange. This only happened with cordless but seems fine now I switched to the old phones. 


It is now unbelievabley slow.

0.3 Mb/s.


I did the BT Home Hub.home>Settings>Advanced Settings>Connections .

This is the data I received.


Please can you advise what is the matter? The connection wasn't sufficient to run a


Thank you



Line state: connected

Downstream 287.1 Kbps

Upstream 1.22 Mbps


ADSL settings

VPI/VCI 0/38

Type PPPoA

Modulation G.992.5 Annex A

Latency type :Interleaved

Noise margin (20.9dB/8.0dB)

Line attenuation 23.4 dB/13.0dB

Output 16.7 dBm/12

FEC evenets 29/62938

CRC 0/24166

Loss of Framing 0/0

Loss of signal 0/0

Loss of power 0/0

HEC Events 0/1974748

Error second 0/5620



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Message 2 of 7

Re: Broadband very slow and occasional dropping in signal

You should be syncing at about 18 Meg instead of the 287 K that you are. The reason you are not is that the DLM system has put you on a banded profile in response to past errors on your line. Your sync speed is being held at the top of the lowest of BT's Banded Profile bands. You need to call your ISP to reset the DLM in order to remove any banding. However should significant errors persist the DLM will reapply banding.


Try plugging your router into the hidden test socket that is revealed when you remove the bottom half of the split faceplate (2 screws) of your master socket. Only do this if you have a split faceplate. Do you have any extension sockets? Are there any wires connected to back of faceplate?

Post the router stats when plugged into test socket.

Try the BT Quiet Line Test (dial 17070 Opt 2), preferably with a corded phone, in the test socket with the router disconnected. If there is any noise, report to your landline provider as a voice fault (don't mention Broadband). Often sorting out voice faults will fix the Broadband as well.

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Message 3 of 7

Re: Broadband very slow and occasional dropping in signal

Hello thanks for the advice.

When you state ISP: I assume you mean BT? (I have my landline and BB with BT)


Also we have master socket in the attic and we never use that.

Then all the other extension sockets are in the study -1st floor. Front bedroom and lounge downstairs.

The main (secondary )socket is in the lounge but there is no electric socket there.

So we have had internet for 15 years in the study - using the extension socket with no difficulty.  


Do I reset teh DLM with BT before i try what you suggest?

IS there an easy way to test for router stats?


Thank you once again.




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Message 4 of 7

Re: Broadband very slow and occasional dropping in signal

Do the QLT at the master socket's test socket 1st. That's the demarcation of BT's responsibility. If it's noisy, sort the voice out before worrying about the BB. Take a coded phone up there.

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Message 5 of 7

Re: Broadband very slow and occasional dropping in signal

Why has my speed suddenly dropped?
ADSL connections (see notes about Infinity at the end), and the notes by RogerB
Changes in your connection speed are automatically managed by the exchange equipment, using a process called
Dynamic Line Management (DLM).
Its purpose it to give you the best speed possible, without introducing a lot of errors back into the BT network.
These errors impact on other users, and can slow their connection down, as your data packets have to keep being resent.
This is a continous process, but certain things can cause it to make drastic changes to your connection speed.

These can include the following:-
You could have also been recently moved from ADSL max to ADSL2+, this would mean that the line
would have to re-train again, and must be left undisturbed  for at least 10 days.
If you keep restarting or disconnecting your BT Home hub, then the exchange equipment will see this as a fault condition, and reduce your connection speed, in an attempt to stabilise your line.
You have recently had a fault on your line which has just been fixed.

Sometimes a single interruption to your line can cause this too, especially if it generates a large error burst.
The effect is that you get placed in a low banded speed profile, and you will notice that your downstream margin is high, usually over 15dB.
The lower the banded speed profile, the quicker it will recover, but it could take up to a month before the fullspeed is recovered.

If you want your speed to recover, then these are the steps you need to take.
DO NOT restart or disconnect the power to your BT Home Hub.
DO NOT disconnect your BT Home hub from your phone line.
Leave everything alone for at least 10 days, so that the exchange can record a stable connection.

During this time, the exchange may drop the connection, and re-establish a faster connection.
If you use the BT Speedtester, then do not restart the BT Home Hub, even if it tells you to.
If after 10 days your speed does not increase, then please return to your forum post.
showing  that you have 10 days of connection time, then the problem can be escalated.

Additional information by forum member RogerB
BT broadband is line adaptive, if you have a good line, you get good broadband , BUT consider this, you only get good broadband
from the outset, if you let the exchange "train" the connection, when it is new, simply because it has to try various methods of modulation.
And once it is running at full speed and set the MSR (maximum stable rate) provided you don't keep disconnecting the router, it will stay that way.
So two important things:  ALWAYS leave the router on, 24/7 and DO NOT impede the training process which can take up to 10 days.
The reasons are vaguely the same for both scenarios:  DLM trains the connection during setup, and DLM runs the connection in a similar but different mode once it's running.
And the most common issue apart from line faults in causing poor broadband is FREQUENT RESETS and DISCONNECTIONS of the router or hub, because if you interupt line management it will demote the line profile if done to excess, with often time consuming efforts and long waits to get it back.
BT don't punish users indiscriminently by making them wait for their broadband speed to come up, but the line management is in place  to DEFEND the network against bad and corrupted data, and if the exchange sees your line being reset too often it assumes a fault,
whereby your linespeed is demoted, and often profoundly so.
Also, because the exchange can't tell the difference between you messing around resetting all the time, and a real line fault, it assumes (using logic) the worst and demotes the line profile.
If you get a real line fault and the noise margin increases, the linespeed will decrease, it's normal, again it's a defence to help give you a service  allbeit a depleted one, and at the same time stop corrupted data getting back to the exchanges.
But unfortunatlely it's at this point when people in general start to become frustrated,  and guess what?
They then start to reset the router in an attempt to "repair" the connection. And in doing so, impede the line management from promoting the linespeed again. (providing any fault is or was fixed).
And to summarise, if the connection is left to run unimpeded, no excess resetting, and left to its own devices, it actually benefits from the good line

history that the exchange has accumulated for your connection, simply because the attention span by the line management is not so profound when it does bite the dust, for whatever reason.
So regardless of the opinions of some, switching off broadband routers is NOT a good idea, not if you want consistent broadband and a good line rate.

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Message 6 of 7

Re: Broadband very slow and occasional dropping in signal

Dear Roger B,


Just to boost signal /reduce interference /optomise the facility would it be worth putting a microlfilter and then attaching a corded phone  in the attic as this is where the master socket is, it is a Face-plate not split (Non-NTE 5) so I assume I can't put an iplate on it?


or will this increase the impedience.


I did the QLT and it is clear- no noise interference in any of the extension sockets- but I guess I should also do in MAster?



Fianlly is it worth switicing my router. bT HH3 to a 5 Ghz frequency or again leave for 10 days and see the results.?


Thank you once again.





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Message 7 of 7

Re: Broadband very slow and occasional dropping in signal

Hi @sianmorgan and thanks for posting.


You need to do the quiet line test at the mastersocket in the attic. That will rule out any internal wiring issues. Can you try that and post back with the results?





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