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Big-G
Aspiring Contributor
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Message 1 of 21

FTTC DLM Reset - Odd Behaviour

Hey Everyone,

Had a copper line fault (loop) which was fixed last week, errors had caused Broadband to slow down from previous 71-74Mbs  to 67Mbps  (downstream handback on my line is 72.8Mbps)

Copper Openreach Engineer, fixed fault and replaced master socket with new 5C MK4 version

Both SNR and Line Attenuation improved after the socket was replaced as well

Requested a "DLM Reset" today as the speed had not improved after a week, which apparently has been actioned. Router re-established a connection afterwards.

However, using some old screenshots from previous router stats to build a history

The SNR after the DLM Reset has dropped to 6db, but the connection sync speed is now much lower

Is this normal? After a DLM Reset should the line not be unbanded and attempting maximum speed again?

Getting and even slower 60Mbps now

Odd with a lower SNR should the sync speed not be faster?

Does the line enter any re-training period after a DLM Reset?

 UPDOWNUP SNRDOWN SNRUP ATT.DOWN ATTNOTE
26/11/201719978784677.65.79.09.9 
15/12/2018199997634323.24.38.99.8 
04/04/2019199997634415.36.47.87.1AFTER MASTER SOCKET REPLACE
16/04/2019199996911015.36.07.57.7AFTER DLM RESET

 

Any help / advice appreciated.

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Distinguished Sage
Distinguished Sage
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Message 2 of 21

Re: FTTC DLM Reset - Odd Behaviour

how did you request a DLM reset?  if helpdesk then they just reboot your hub

if it was a broadband engineer not phone engineer who fixed the fault then he could have requested a DLM reset



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Big-G
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Message 3 of 21

Re: FTTC DLM Reset - Odd Behaviour

It was the Openreach Broadband engineer that requested the DLM Reset.

Very confused at the moment why it appears to have had the opposite effect on speed

....when the stat's look as if they have improved?

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Distinguished Sage
Distinguished Sage
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Message 4 of 21

Re: FTTC DLM Reset - Odd Behaviour

A DLM reset puts everything back to an open profile, give it a few days and G.Inp and 3dB margin will probably kick back in.

Distinguished Sage
Distinguished Sage
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Message 5 of 21

Re: FTTC DLM Reset - Odd Behaviour

Which exchange and cab are you on?



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Big-G
Aspiring Contributor
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Message 6 of 21

Re: FTTC DLM Reset - Odd Behaviour

Thanks. So you think it’s worth not touching the router and leaving DLM to work it’s magic over the next few days?

Just a bit worried at the slow initial sync speed immediately after the reset.
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Moderator
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Message 7 of 21

Re: FTTC DLM Reset - Odd Behaviour

Hi @Big-G and welcome.

 

I'm glad to hear the engineer visit has sorted the problems. Your best bet would be to leave everything connected to allow the connection to recover. Give it a few days and post back and let us know how you get on.

 

Cheers

 

David

Community ModeratorDaveM
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Big-G
Aspiring Contributor
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Message 8 of 21

Re: FTTC DLM Reset - Odd Behaviour

Thanks for the reply and the welcome @DavidM

Okay, no problem. Thanks for the advice.

Will report back in a few days with how I'm getting on, hopefully with good news.

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Starwire
Contributor
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Message 9 of 21

Re: FTTC DLM Reset - Odd Behaviour

A DLM Reset will turn off Vectoring. The DSLAM will switch it back on in a few days.
Big-G
Aspiring Contributor
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Message 10 of 21

Re: FTTC DLM Reset - Odd Behaviour

Thanks @Starwire, for the additional info.

I'm in I.T and technical myself, I find it useful to know what's happening. The community is a reassurance for that.

Hopefully that sync speed and overall speed will start climbing in the next few days then.

FIngers Crossed Smiley Happy

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