The noise margin shows loads of spare (like ADSL the target noise margin is usually around 6dB so it currently being 31.4 shows lots of room for increased speeds). If the noise margin is not erratic then DLM should automatically shift the line to a higher rate. If it is erratic then it suggests there is a noise source somewhere that has made DLM kick in and reduce the sync rate.

I suspect it's a reporting error given that th me attainable rate is so close to the current rate.

I was surprised at that but would suggest the margin is a decimal point out so around 3dB - which would be low and so suggest the decision to get an engineer out is most likely correct. Would still be useful to monitor the SNR to see if it is varying.

Looks to me like DLM has kicked in and lowered the sync rate. I hope you turned everything off when you disconnected the extension?

I have known people not to do this when messing with the wiring and the DLM has thought that it's a major fault and significantly lowered the sync rate to make it stable.

In reply to a post by ian72:

The noise margin shows loads of spare (like ADSL the target noise margin is usually around 6dB so it currently being 31.4 shows lots of room for increased speeds). If the noise margin is not erratic then DLM should automatically shift the line to a higher rate. If it is erratic then it suggests there is a noise source somewhere that has made DLM kick in and reduce the sync rate.

So no different to ADSL really then, I still have the separate VDSL modem, so I can not see any info, so I have not really taken much notice of what is what on fibre.

Anyway, this morning i connected to their network via my tablet and done a speed tests, 31Mb/s, so it is fixed, in fact I have never seen their broadband so fast, it is on par with mine now, which is what it should be more or less.
I will pop over this after noon when everyone is awake and put the router back to where it should be, I presume there was nothing wrong with the extension upstairs, but the quality of the line affected the router to sync, because of the extra length.


I will also do another print out of the info to see how much it changed,

thanks to everyone on here for the help.

In reply to a post by robertcrowther:

Looks to me like DLM has kicked in and lowered the sync rate. I hope you turned everything off when you disconnected the extension?

I have known people not to do this when messing with the wiring and the DLM has thought that it's a major fault and significantly lowered the sync rate to make it stable.

Which extension? they have two, the one that Bt put in that is upstairs, which only have a socket for the router or the one downstairs which just plugs into the master socket that are used for the phones.

I switch the router off, unplugged the downstairs extension and then switched the router back on, made no difference anyway.
Bt seemed to have fixed the fault. either this morning or late last night.

when I was over my neighbours place and done a speed test on my phone to my network, i lose around 5Mb/s and my router is an old plusnet Sagem thing that is only 2.4Ghz, so the BT hub, which BT says is the best thing since sliced bread should do a better job.

If I use the homehub at my parents, I get 70Mbps over WiFi, like most of us though I have neighbours attached, bluetooth devices (2 wireless headsets, 2 bluetooth speakers, a bluetooth keyboard and mouse), 2.4ghz doorbell, and multiple WiFi SSIDs in range.

I know the neighbours also have a 2.4Ghz TV transmitter for their Sky+ to work in their bedroom.

Other things such as baby monitors, neighbours doorbells / landlines etc also no doubt exist.

Combine this together and what is 70Mbps at the parents more remote location, is 13Mbps at the very best in my densely populated location. There are times it becomes so slow you almost wait 30 seconds for a web page to load.

I would like to say this is exclusive to just my location, but having moved 4 times now I see a very similar situation at all but one property.

I would never rely on 2.4Ghz for fibre speeds given my experiences.

I know what you are getting at and I agree, but Wi-fi was the best way to see if it is better at the time.

i have just moved the home hub back upstairs and they lose about 2-3Mb/s, I presume due to the length of the extension, ADSL was never that fragile, but they are still getting a good 24Mb/s, sometimes a bit more, so it is fine.

Even going via the lan from the computer is it more or less the same.

Here are the stats as they are now.

5. VDSL uptime: 0 days, 00:07:13
6. Data Rate: 9999 / 24552
7. Maximum Data Rate: 11832 / 31471
8. Noise Margin: 7.9 / 7.7
9. Line Attenuation: 42.7 / 35.3
10. Signal Attenuation: 0.0 / 0.0

I should have done them when it was downstairs as well, just to be nosy, but oh well the main thing it is a lot better.

thanks for help once again people.

Yes and my whole point is not applicable here anyway as the homehub is most likely dual band

You're right extensions affect VDSL a fair bit more. I have a 10m extension and the attenuation goes up 1.5db using it. Luckily I have a very short line so I get full speeds either way.

My old house had a master in a good location, the current one has the master in the back of a bedroom hence I use the extension. It's not always possible to use the master.

The main thing to monitor is whether their speed keeps on falling in the extension, it may indicate the extension is picking up interference from electrical wiring or something similar triggering DLM.

In reply to a post by zyborg47:

i have just moved the home hub back upstairs and they lose about 2-3Mb/s, I presume due to the length of the extension, ADSL was never that fragile,

A very rough calculation, ignoring losses from joints ...

We should expect speeds to drop from around 80 Mbps at 300m to 25 Mbps at 1250m. That equates to a 1Mbps drop for every extra 17m of cable.