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Message 1 of 8

Low fibre broadband speed

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Hi there, 

I have a problem with my broadband, although I have moved to fast fibre my speed is only 6.2 MB which is really slow.   If I reset the hub, the speed will rise to 8.3mb but then drops again over a period of a few days. This is reflected in the noise margin rising to 10.5. I know my speed is poor due to aluminium cables on the estate.

I have two questions :- 

Will Openreach ever change the cables in order to supply a decent broaband speed.

Can the noise margin be fixed at 6.5 in order to give us the maximum speed on the poor cables.

Hope someone can help !!


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Message 2 of 8

Re: Low fibre broadband speed

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Welcome to this user forum.

In order to find out what services and speed range you should be getting, please enter your phone number into this form.
Broadband availability checker

Please remember to edit out your phone number before you post the results.

Is there any noise on your phone calls? Dial 17070 and select option 2, there should be no noise between the announcements.

Please could you post the information from your home hub.

If you are using the BT Smart hub you can get your connection stats by, Opening a new web browser on your connected device and type or bthomehub.home into the address bar. This will open the Hub Manager.  Click Advanced Settings’ and then ‘Technical log’

 Openreach do not normally change cables unless they are faulty, and you cannot make any phone calls.

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Message 3 of 8

Re: Low fibre broadband speed

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Tech Log 2.PNGTech log.PNGBroadband.PNG

Hi there,  here is the information you requested. There is no noise when when I perform the test you suggested.

Hope you can help solve this problem.

Kind regards.


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Message 4 of 8

Re: Low fibre broadband speed

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connection time only 18hrs was that manual reset or hub dropping conenction?

have you tried connecting to test socket with a filter to see if that helps speed and stability  should try this even if using filtered master socket

your speed is within your estimated range so unless there is a line fault BT are unlikely to help

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Message 5 of 8

Re: Low fibre broadband speed

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There was very little benefit moving to fibre broadband FTTC ( VDSL) as your ADSL2+ speed would be almost the same, as you are too far away from the cabinet.

VDSL on a long line is likely to be more unstable than ADSL2+, so you may see more disconnections.

As it is,  DLM (Dynamic Line Management) has reduced your speed to make the line more stable, which is why the downstream noise  margin is much higher than it should be.

All you can do is to leave it all alone, with no restarts or disconnections, and if you are really lucky, you connection speed may increase after a few weeks.

Personally, I do think that customer services should promote FTTC, unless you are going to get a much faster connection.

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Message 6 of 8

Re: Low fibre broadband speed

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Hi Keith, thanks for your help. Is there any way that the DLM can be turned off and the noie margin fixed ?

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Message 7 of 8

Re: Low fibre broadband speed

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Noise Margin !!

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Message 8 of 8

Re: Low fibre broadband speed

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DLM is automatic.

How does DLM (Dynamic Line Management) work (Plusnet page)

Also lookup noise margin and DLM here

In theory, you may eventually get about 9.8Mbs connection speed, but that depend on how many errors DLM detects on the line, which can be quite a lot at that distance from the cabinet.