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Speed reduction since damaged fibre cable

Haggini — Sun, 19 Oct 2025 14:56:16 GMT

Hi,

In early September Thames Water managed to sever the BT fibre cable for our street while doing some ground works. The outage lasted at most 48 hours until it was repaired by BT OpenReach.

Ever since the repair I have noticed that our broadband speeds have dropped from those enjoyed before - see route speed test graphs below. Previously download speed was ~70mbps, now its dropped to ~50 mbps. Given the BT Wholesale Speed website no longer appears to exist I don't know where to check the exchange stats.

Could this drop be caused by the 48 hour outage resulting in a cap being applied because the line management service thinks the line is faulty and reduced it to stabilise it - or could it just be that the repair has impacted the speed of the line?

Thanks,

Speed test results leading up to the fibre cable damage (shown by drop to ~50mbps)Speed tests since the fibre cable was repaired

Re: Speed reduction since damaged fibre cable

TimCurtis — Mon, 20 Oct 2025 12:32:14 GMT

@Haggini

The checker does exist here

Re: Speed reduction since damaged fibre cable

imjolly — Mon, 20 Oct 2025 13:12:31 GMT

can you post your hub stats please advanced settings then technical log information . see what attainable speed you have and current noise margin

Re: Speed reduction since damaged fibre cable

36ULW — Mon, 20 Oct 2025 15:57:06 GMT

Was it a Fibre Cable or Metallic Path like Copper or Aluminium?

Pure FTTP shouldn’t be impacted by DLM, only FTTC Services would be.

Re: Speed reduction since damaged fibre cable

Haggini — Mon, 20 Oct 2025 18:02:10 GMT

Thanks all for helpful responses so far.

Great to see wholesale checker does still exist - given I don’t have a landline number what should I use to check this?

In terms of hub - I use my own NETGEAR Orbi router and draytek vigor setup - I may have some images from a previous post with some of that info. Will be a few days before I can post updated numbers.

re: type of cable - this I don’t know - but I suspect it’s FTTC.

Thanks,

Re: Speed reduction since damaged fibre cable

imjolly — Mon, 20 Oct 2025 18:25:12 GMT

Try using fast.com and see what result you get

Re: Speed reduction since damaged fibre cable

Haggini — Mon, 20 Oct 2025 21:37:14 GMT

Here’s the exchange reading from 1 year ago

(this was from a separate issue when I returned to BT and was put on a fibre 1 profile despite signing up for Fibre 2 - I’ve been moved to EE since then. The mods were able to resolve this for me back then)

Re: Speed reduction since damaged fibre cable

Haggini — Mon, 20 Oct 2025 21:43:19 GMT

Scratch that - here’s the latest up to date exchange information.

Re: Speed reduction since damaged fibre cable

Haggini — Mon, 27 Oct 2025 22:13:58 GMT

@imjolly - Hi im back now - so I can get router stats to go with the exchange info in my previous post. Like I said I don't use my BTHub, I have a Orbi 6 with satellite. Here are the connection stats from it:

Port	Status	TxPkts	RxPkts	Collisions	Tx B/s	Rx B/s	Up Time
WAN	1000M/Full	335038164	729673470	0	918	1073	38 days 04:19:04
LAN1	1000M/Full	141202105	95101519	0	594	455	38 days 04:19:04
LAN2	Link Down	0	0	0	0	0	--
LAN3	Link Down	0	0	0	0	0	--
2.4 GHz WLAN b/g/n/ax	573.5M	52588016	28770057	0	720	281	38 days 04:20:51
5 GHz WLAN a/n/ac/ax/be	1201M	258836992	116996174	0	287	396	38 days 04:20:51
WLAN Backhaul	2402M	334314707	128760103	0	967	495	38 days 04:20:51

If this isn't what you're after let me know and I can try and find it.

Thanks,