This topic

Consistently slow speeds for fibre

MattOfBelfast — Thu, 29 Jul 2021 09:53:25 GMT

Hi,

I'm on the BT Full Fibre 900 plan which I believe guarantees a 450Mbps download speed.

Unfortunately, I've noticed not hitting that connsistently. I've actually went as far as measuring the speed periodically since june (see graph below, the red line is 450Mbps):

note: measurements done by a server directly connected to the BT router with an ethernet cable, taken every 5 minutes using the speedtest cli (https://www.speedtest.net/apps/cli).

Is there anythig tnat can be done to help? BT's own test tools just say that everything's fine.

Re: Consistently slow speeds for fibre

pippincp — Thu, 29 Jul 2021 12:13:27 GMT

How are you connecting, wired or wireless?

Re: Consistently slow speeds for fibre

MattOfBelfast — Thu, 29 Jul 2021 13:32:46 GMT

connected by ethernet (cat7) directly to the hub

Re: Consistently slow speeds for fibre

licquorice — Thu, 29 Jul 2021 14:03:49 GMT

What speed do you get if you bypass the hub and make a direct PPPoE connection from your PC to the ONT?

Re: Consistently slow speeds for fibre

MattOfBelfast — Thu, 29 Jul 2021 16:43:13 GMT

I can't say I've done this before, are there some instructions I could follow sorry?

Re: Consistently slow speeds for fibre

licquorice — Thu, 29 Jul 2021 17:21:48 GMT

In Windows10, go to Settings > Network and Internet > Dial Up > Set up a new connection > Set up a broadband or dial up connection to the internet > Next > Set up a new connection anyway > Broadband (PPPoE) > enter username bthomehub@btbroadband.com and password BT, press connect.

Unplug the WAN Ethernet lead from the hub and plug it into your PC.

Re: Consistently slow speeds for fibre

MattOfBelfast — Thu, 29 Jul 2021 18:28:16 GMT

thanks, I'll have to try this tomorrow but i'll reply here again.

Re: Consistently slow speeds for fibre

MattOfBelfast — Fri, 30 Jul 2021 16:45:24 GMT

So I removed the ethernet cabel used for the WAN connection from the back of the hub, and used that same connection for PPoE.

doing a quick test on speedtest.net got me a much better speed (see attached screenshot).

replacing the cable into the hub and trying again but this time from a machine connected to the hub got me much less:

> speedtest-cli
Retrieving speedtest.net configuration...
Testing from BT (81.157.4.213)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Opti-Fi Limited (Douglas) [105.20 km]: 21.695 ms
Testing download speed................................................................................
Download: 237.21 Mbit/s
Testing upload speed......................................................................................................
Upload: 87.74 Mbit/s

So it seems like the hub isn't able to provide the same speed to a machine connected directly to it by ethernet?

Re: Consistently slow speeds for fibre

licquorice — Fri, 30 Jul 2021 16:48:14 GMT

Have you tried a factory reset of the hub? Remember to turn off Smart setup again afterwards.

Re: Consistently slow speeds for fibre

MattOfBelfast — Tue, 03 Aug 2021 09:23:34 GMT

I've done a factory reset and turned off Smart setup. Unfortunately it's the same behaviour.

Re: Consistently slow speeds for fibre

MattOfBelfast — Thu, 30 Jun 2022 08:37:19 GMT

Unfortunately this is still not getting any better longer term:

Frequently every day the speed drops well below the guaranteed download speed of 450Mb.

Am I misunderstanding and the "guaranteed minimum speed" doesn't in fact take into the account the hub that's actually supplied? What's the point of using speeds that aren't accessible unless you're the only device plugged into the port??

Again, these values are taken from a device connected directly to the back of the hub with a cat7 ethernet cable.