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Message 1 of 36

Re: Download Speeds Dropped Dramatically - Broadband Fault Not Fixed

Can I join this thread as I am having a similar problem?

ADSL and with BT Broadband for several years and usual download is 0.8 – 0.9 mbps but this has dropped to around 0.3 mbps and sometimes 0.1 mbps for the last 5 days. Upload always higher best 0.8 mbps. Time of day makes no difference so assuming not congestion/contention.

Just BT tested with the Hub 5 connected to the master socket and a direct connection to the computer and results 44.75 Ping, 0.28 down load and 0.74 upload.


Trying the usual with BT help but not getting any better


ADSL Results

WDC ADSL 2       up to 5.5 rate;  -- upstream,        4.5 to 6.5 range


Annex M             up to 5.5              up to 1                  4.5 to 6.5


WDC Fixed rate 2

Fixed Rate            2


Equipment seems ok – the hub light is steady blue  –  seems to be three possibilities

Problem at the exchange, problem somewhere between the exchange and the road junction box ; somewhere from where the line enters my property and the hub?  Or are there other possibilities??





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Message 2 of 36

Re: Download Speeds Dropped Dramatically - Broadband Fault Not Fixed

I have started your own thread as problems can be very different and it will make helping you easier
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Message 3 of 36

Re: Download Speeds Dropped Dramatically - Broadband Fault Not Fixed

Hi Welcome to the community forums

Have you tried the quiet line test dial 17070 option 2 you should hear no noise if you can hear noise then it needs reporting to BT faults on 151 with no mention of broadband
in the call are you connected to the test socket using a new filter

if using a hub 4 locate these lines located in the hub logs
Lines should look like this
19:11:29, 07 Nov. (2290101.460000) DSL noise margin: 7.00 dB upstream, 6.10 dB downstream
19:11:29, 07 Nov. (2290101.390000) DSL line rate: 448 Kbps upstream, 288 Kbps downstream

if u The stats for the Home Hub 6 can be found on the Information page from then Advanced Settings -> Technical Log. 

Can you run this checker and post back a screen shot of the results. Make sure you delete your phone number before posting.

Can you use this speed tester then carry out the further diagnostics and post back a screen shot of all the results including your IP profile for up and down.

This test must be done with a wired connection.

once you have posted the information asked for then the community members can help you more

Thank You

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Message 4 of 36

Re: Download Speeds Dropped Dramatically - Broadband Fault Not Fixed

BTW Performance Test


Download 0.29 mbps   upload 0.77 mbps  Ping 31.25




ADSL 3.png

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Message 5 of 36

Re: Download Speeds Dropped Dramatically - Broadband Fault Not Fixed

can you please post the stats from your hub as asked for also can you please post the further diagnostic part of the BT speedtest using a wired connection  you will find the helpdesk page in the hub manager can you please post that full page

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Message 6 of 36

Re: Download Speeds Dropped Dramatically - Broadband Fault Not Fixed

Thanks for prompt reply..


BTWholesale Test Results - Wired Connection

1. Best Effort Test

Download Speed 0.24mbps   0.25 max achievable speed

Download speed achieved during this test was 0.24mbps  For your connection the acceptable range of speeds is 0.1 mbps - 0.25 mbps

IP profile for your line is 0.25mbps



2. Upstream Test

Upload Speed 0.62mbps  max achievable speed 0.83mbps

Upload speed achieved during this test was 0.62mbps 

IP profile for your line is 0.83mbps


We were unable to identify any performance problem with your service at this time.
It is possible that any problem you are currently, or had previously experienced may have been caused by traffic congestion on the Internet or by the server you were accessing responding slowly.
If you continue to encounter a problem with a specific server, please contact the administrator of that server in the first instance.



I have a Hub 5 - which page of info do you need?




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Message 7 of 36

Re: Download Speeds Dropped Dramatically - Broadband Fault Not Fixed

Product name:BT Home Hub
2. Serial number:+068543+NQ41152759
3. Firmware version:Software version (Type A) Last updated 01/07/15
4. Board version:BT Hub 5A
5. DSL uptime:0 days, 01:19:47
6. Data rate:994 / 287
7. Maximum data rate:20505 / 2928
8. Noise margin:5.9 / 29.8
9. Line attenuation:16.0 / 34.7
10. Signal attenuation:16.0 / 32.0
11. Data sent/received:4.8 MB / 43.3 MB
12. Broadband
13. BT Wi-fi:Yes
14. 2.4 GHz Wireless network/SSID:BTHub5-8P82
15. 2.4 GHz Wireless connections:Enabled (802.11 b/g/n (up to 144 Mb/s))
16. 2.4 GHz Wireless security:WPA2
17. 2.4 GHz Wireless channel:Automatic (Smart Wireless)
18. 5 GHz Wireless network/SSID:BTHub5-8P82 5GHZ
19. 5 GHz Wireless connections:Enabled (802.11 a/n/ac (up to 1300 Mb/s))
20. 5 GHz Wireless security:WPA2
21. 5 GHz Wireless channel:Automatic (Smart Wireless)
22. Firewall:Default
23. MAC Address:34:8a:ae:c8:45:d2
24. VPI/VCI:0 / 38
25. Modulation:G.992.5 Annex A
26. Latency type:Interleaved
27. Software variant:AA
28. Boot loader:1.0.0
BT Home Hub 5 (Type A) | Software version | Last updated 01/07/15



Found it...

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Message 8 of 36

Re: Download Speeds Dropped Dramatically - Broadband Fault Not Fixed

the helpdesk page please
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Message 9 of 36

Re: Download Speeds Dropped Dramatically - Broadband Fault Not Fixed

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.

You can calculate your final speed by using this website.

Maximum speed calculator
Infinity connections
A similar process is applied to the connection between the Infinity cabinet, and the Openreach modem.
You cannot view that connection information, but the same thing applies, do not restart or disconnect the Openreach modem.
The BT home hub only acts as a router, and restarting it will not affect your physical connection speed to the cabinet.
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 10 of 36

Re: Download Speeds Dropped Dramatically - Broadband Fault Not Fixed

Have you tried the quiet line test as explained in my earlier post
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