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Here we go again: DLM SLOW TO RESTORE DOWNSTREAM SYNC SPEED.

album56
Conversation Starter
Message 31 of 31

The downstream VDSL sync speed dropped to 41Mbit/s a couple of weeks ago & hasnt changed despite switching router off for 30mins etc to try to get DLM to activate.
The router info:-
Upstream line rate 20Mbit/s
Downstream line rate 35Mbit/s
Max upstream line rate 21Mbit/s
Max downstream line rate 88Mbit/s
Upstream noise margin 6.1db
Downstream noise margin 13.2db
Upstream interleave depth 1
Downstream interleave depth 2977
So I still have a very underperforming fibre broadband with speedboost.
The speedboost has worked for periods but seems very unreliable.

This has been ongoing problem, sometimes for a week the downstream sync speed will be 61 Mbit/s then the internet light turns red & I loose all connection until I reboot the HG633 router which restores connection at a much lower sync speed.

I am desperate for fttp to stop all this nonsense with hybrid fibre/copper.

30 REPLIES 30

Message 1 of 31

Hi Mike

 

Thanks for keeping us updated.

 

Please let us know if you do experience any further issues.

 

Debbie 🙂

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Message 2 of 31

Hi Debbie

Openreach engineer has called & done some testing. I dont think he found any fault but looks like DLM has been reset because downstream now 65Mbp/s. Lets hope it stays stable etc.

Many thanks for your help.

Mike

Message 3 of 31

Hi Mike

 

Thanks for your reply.

 

I have arranged the engineer visit for 28/04 PM (1pm - 6pm)

 

Please let us know how you get on following this visit.

 

Thanks

 

Debbie

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Message 4 of 31

Hi Debbie

Anytime am or pm after Tues 27th April would be fine.

Thanks

Mike

Message 5 of 31

Hi Mike

 

Thanks for confirming your details.

 

Please can you provide your availability for an engineer visit AM and PM and I will then book the first available appointment.

 

Debbie

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Message 6 of 31

Hi Debbie,

Details confirmed.

Regards

Mike

Message 7 of 31

Morning Mike

 

I've checked the connection stats again and DLM has not made any further changes.

 

I'm just sending you a Private Message to confirm some details so I can arrange an engineer visit.

 

Thanks

 

Debbie

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Message 8 of 31

Hi Mike

 

If the speed doesn't increase then we can arrange an Openreach engineer visit. Only the engineer can reset DLM.

 

Thanks

 

Debbie

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Message 9 of 31

Thanks Debbie

Yes I'll see what happens, but I'll be very surprised if DLM does anything, pretty sure its stuck in a banded profile & will need a DLM reset.

Regards

Mike

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Message 10 of 31

Hi Mike

 

I've checked the connection stats and your line is in sync at 35.5mb. DLM has not made any changes to the line profile yet.

 

I will check the connection stats again on Monday.

 

Thanks

 

Debbie

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Message 11 of 31

Hi Mike

 

That's great. I will check the connection stats again on Friday.

 

Thanks

 

Debbie

Message 12 of 31

Hi Debbie,

New WiFi Hub router is now ok after reset, all ethernet ports working.

Now leaving alone, no more re-boots or resets, lets see if DLM responds.

Regards

Mike

Message 13 of 31

Hi Mike

 

Thank you, please let us know how you get on.

 

Debbie

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Message 14 of 31

Hi Debbie,

I'll try a reset on the router to see if that fixes it, & let you know.

Regards

Mike

Message 15 of 31

Hi Mike

 

Apologies for this.

 

Would you like me to send a replacement router now or wait until you have monitored the connection this week with the router you have connected?

 

Thanks

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Message 16 of 31

Hi Debbie

I have re-booted the router this morning as I was having difficulty with my music streamer which is connected with ethernet cable.

Turns out one of the ethernet ports on the new router is faulty, I swopped cables at the router end & the fault stayed with port 3.

Not a very good replacement for the HG633 that had all 4 ethernet ports working fine.

I will leave the new one connected for now as I can manage with 3 working ports for a while, but obviously I would like another replacement asap.

As far as the underperforming broadband downstream speed goes it looks increasingly like Openreach DLM is using a banded profile which has a 13db noise margin when its supposed to be approx 6db,

Upstream is spot on max & 6+db.

I would like to get this fixed please.

Regards

Mike

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Message 17 of 31

Hi Mike

 

Thanks for keeping us updated.

 

I will check the connection stats again on Thursday to see if DLM has made any changes to the line profile/speed.

 

Thanks

 

Debbie

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Message 18 of 31

Hi Debbie

New router received & connected. Allowed 40mins between switching off old router & switching on new one, now monitoring speeds for a few days hoping to see downstream speeds back to 60ish Mbp/s as they were a few months ago.

Regards Mike

Message 19 of 31
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Message 20 of 31

Hi Debbie,

Thanks for that, I'll let you know what happens with new router.

Regards Mike