FTTP below spec

Have a 300/50 service installed.

Testing the downstream (using BTs internal test) - with Gbit Ethernet connected DIRECT to the BT Hub I get from 298 to 305 Mbps which is fine. If I use wireless from the hub or a remote WAP - high 200s so again fine.

The upstream is a different picture. Wired direct, wired through the network and switch, wireless to the hub, wireless to a network WAP all give very, very similar repeatable results 35.1 to 35.5 Mbps which is well down from the expected 48Mbps or there abouts.

Any thoughts on what may be going wrong? On why there appears to be a restriction.

That’s an odd one ..... maybe a remote profile issue ?

Often the advice given is to make a direct connection to the ONT.

That is on the list of things to try.

Also, may connect my Ubiquiti Gateway direct and take the BT hub out of the link too.

So far, UK based support, India based support, Enhanced IT support have all failed - next will be a tech visit. To myself and the Enhanced support, it is possible that an artificial cap is in place incorrectly - should be 50 but set to 35 (maybe). I can run 10 tests and get 35.4 Mbps 8 times and 0.1 or 0.2 lower the other times, so totally consistent.

Test direct. Nothing in between. Try a different box. You should *easily* be able to saturate 50 Mbps.

In fact you should easily be able to saturate the full wire speed up to a Gbps on a modern machine with clean setup.

It should be bouncing up to the 50M upload limit 24/7.

Edited by Pheasant (Tue 30-Mar-21 21:41:24)

In my (limited) experience , it is usual for speed tests of the upload speed on Openreach FTTP to be exactly the profile figure , or often a little above.

Whereas my 330/50 on g.Fast has just given
https://www.speedtest.net/my-result/i/4505223737
(over wifi with the router two floors below.

I reckon there’s summat amiss with your profile

Exactly ... I would be happy if it was 48, 50, or just above. 35 is way too low.


And have to agree about the profile being wrong.

Edited by MHC (Tue 30-Mar-21 21:48:10)

Def. looking that way. Testing with another box (direct in) removes all doubt that it’s something up with the local machine.

In reply to a post by Zarjaz:

In my (limited) experience , it is usual for speed tests of the upload speed on Openreach FTTP to be exactly the profile figure , or often a little above.

Whereas my 330/50 on g.Fast has just given
https://www.speedtest.net/my-result/i/4505223737
(over wifi with the router two floors below.

I reckon there’s summat amiss with your profile

That “southern ping” is incredible! I have never achieved below 18 up here and mostly it’s 20-24ms.

And I though mine were good ... moving to FTTP I see 5 ms on speedtest.net and around 7 on TBB and BT

edit to add:

Have managed to find a server with 4ms response!


One thing I notice with all the various servers on speedtest.net is that whereas the download is a little variable (WiFi) the upstream maxes out at 31.72 and flat lines all the way across so demonstrating that the problem is probably a cap/setting somewhere.

Edited by MHC (Tue 30-Mar-21 23:39:18)

I suspect your provider will be pushing for an Openreach faulting visit next. A somewhat pointless exercise, as there is little or nothing the bod can do other than confirm your findings, and pass up the chain .... but I guess they’ll have to adhere to process.