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[William Grimsley]

Hi everyone,

Before I go on, I have permission on behalf of my friend to post this screenshot and luckily it has no personal information so it's fine, anyway.

Anyway, as you can see my friend is getting a very slow "capped" speed for his line length which as you can see below, is not very long at all. Can anyone help to see if he should ring BT to organise an engineer visit?

Many thanks!

[Dray]

Attenuation of 31.3 is a long line and the sync speed looks to be very good. It isn't capped as far as I can see.

[gazaai]

+1, The line is very long at 30+ attenuation and the speed is not capped either.

[William Grimsley]

Hang on. My line attenuation is 25.6 dB so nearly as long and I get double what he gets...

[Starman]

VDSL2 speed drop off rate increases quite drastically once you start getting over 500M long line length.



You can even see this by looking at the MDSL all user stats and sorting by line attenuation.

https://www.mydslwebstats.co.uk/HG612-MultUsersLivei.htm?UO=9

[gt94sss2]

Also worth looking at what https://www.dslchecker.bt.com/ says for the line - but yes, it seems to be a long one..

[Dray]

Interesting graph from "Ofcom" on an Australian site. Why have Ofcom misspelled "meters" ?

[William Grimsley]

Also worth looking at what https://www.dslchecker.bt.com/ says for the line - but yes, it seems to be a long one..

Yeah, he's getting the speed shown for the result of his landline number, but why is his upload speed so low?

[Starman]

Because of the amount of spectrum available compared to downstream. If he is getting what the DSLchecker says then there is nothing to be done the line is performing as specified.

[William Grimsley]

Because of the amount of spectrum available compared to downstream. If he is getting what the DSLchecker says then there is nothing to be done the line is performing as specified.

Ok, I understand that but why is the download speed so much slower e.g. 50% of mine when he only has a 200 m longer line than me?

[Starman]

Because of the increasing impedance on VDSL2 signals - that's just a limitation of the technology and the type of cable carrying the signal. Its no different than ADSL just rather than taking say 10KM to go from 20Mb to 1Mb it only takes about 600M to go from 100Mb to 10Mb.

[William Grimsley]

Because of the increasing impedance on VDSL2 signals - that's just a limitation of the technology and the type of cable carrying the signal. Its no different than ADSL just rather than taking say 10KM to go from 20Mb to 1Mb it only takes about 600M to go from 100Mb to 10Mb.

Yeah, Openreach are going to have to do something about this. Either bring FTTP to everywhere or increase the limit in the cabinets.

[Starman]

There are technologies such as G.INP, Vectoring which could help current VDSL2 deployments and of course the forthcoming G.FAST based service in the next few years.

[William Grimsley]

There are technologies such as G.INP, Vectoring which could help current VDSL2 deployments and of course the forthcoming G.FAST based service in the next few years.

I hope G.FAST comes to my lane, I'm already getting bored with 32 Mbps...

[William Grimsley]

Ok, I've just thought about this again. Why do I have one friend who gets exactly the same download speed as the other and one gets 5 Mbps upload and one gets 1 Mbps upload? They're both on Huawei cabinets.