Slower Broadband after power cut

Over the past 10 days or so our local power grid has been having a few issues. Our street has had 2 power surges (everything off then back on in a second or two) and then one prolonged outage that lasted for an hour or so.

Since then, my broadband DL speed has dropped from an average of around 40 MBPS to around 12 MBPS.

It's still perfectly usable but obviously I'd prefer to have it running at full whack!

I've tested with 2 different routers & different filters but the speed remains the same.

Any ideas?

Whatever you do don't repeatedly re-sync to see if it improves. If you do, it won't.

Do you have access the router stats, the most important ones being the connection speeds, SNR Margins and attenuations? We could do with seeing them .

Thanks for the reply. I do have access to the router stats, and the details are below: (I think!)

Speeds:

UP - 11 Mbit/s
DOWN - 13 Mbit/s

SNR

SEND - 6 dB
RECEIVE - 23 dB

Line attenuation

SEND - 29 dB
RECEIVE - 19 dB

Same thing happened to me over a month ago , I used to get a good 73 Mbps now I'm lucky to get between 50 to 60 Mbps
Browsing has slowed right down to , what was a decent connection is now rubbish especially evening time

That Receive SNR (Margin) of 23dB does suggest DLM has capped your speed because of the errors caused by the power problems. Not being awkward, have you got the full Kbps figures for the speeds please? Those look like you have rounded them to Mbps.

The reason I ask is because the numbers on capped lines are usually recognisable. Then it becomes a question of putting up with it and waiting possibly several weeks, until DLM relents in several steps. The steps come quite rapidly once it does do this. Or trying to persuade your ISP to get the DLM reset. Some are willing, some don't even seem to understand the question .

well 73 down to 50 wont affect browsing speed, but been interleaved would. Has your latency gone up?

You'd think DLM would've treated it as a "Wide Area Event" considering that the OP described the power issues affecting a wide area.

A street wide area outage may seem a wide area to those living in it, but in relation to an exchange area it is probably not.

The OP appears to be on VDSL, and wide area events are decided by the DSLAM in the cabinets, AFAIK.

In reply to a post by deezel:

Same thing happened to me over a month ago , I used to get a good 73 Mbps now I'm lucky to get between 50 to 60 Mbps
Browsing has slowed right down to , what was a decent connection is now rubbish especially evening time

We are talking about connection speed, not throughput though. Yours sounds like a throughput problem.

Sorry for the late reply. I've had a look and here is todays speeds in Kbit/s. It's down a bit on the previous reading:

Download: 9.999 kbit/s

Looking at the throughput and it does look to be capped at 10 MBPS:

Max. DSLAM throughput kbit/s: 10000
Attainable throughput kbit/s: 48594
Current throughput kbit/s: 9999

Reading the strange use of "throughput" in those figures as in fact being "Sync speed" or "Connection speed" (which are identical to each other), they clearly show that the DLM had capped the line at 10Mbps.

Yes, quite a severe cap, seems extreme for just a few power cuts!