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Standard User wolvesmad
(knowledge is power) Wed 19-Feb-20 18:42:26
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3db SNR - DLM Parameters?


[link to this post]
 
What does DLM look for in a line for it then to proceed reducing the target SNR from 6 to 3db?

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EE Fibre Plus 68|20Mb
Standard User MoM
(learned) Wed 19-Feb-20 19:55:41
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Re: 3db SNR - DLM Parameters?


[re: wolvesmad] [link to this post]
 
Retransmissions from the cab to the modem.

Packet errors really, best thing is to get your home wiring set up right plug the modem in the best point and set up a mesh wireless. Let the DLM do its job and get a stable connection

Edited by MoM (Wed 19-Feb-20 19:57:22)

Standard User wolvesmad
(knowledge is power) Wed 19-Feb-20 20:47:01
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Re: 3db SNR - DLM Parameters?


[re: MoM] [link to this post]
 
Just curious as to why it hasn't kicked in on my line yet. At my previous property I think it was around a week it started decreasing.

I'm around 20 days in since my regrade to 80/20, current VDSL uptime is 10 days. G.INP activated.

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EE Fibre Plus 68|20Mb


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Standard User MoM
(learned) Wed 19-Feb-20 20:53:48
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Re: 3db SNR - DLM Parameters?


[re: wolvesmad] [link to this post]
 
Is it causing a problem?
Standard User BLaZiNgSPEED
(member) Wed 19-Feb-20 21:09:45
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Re: 3db SNR - DLM Parameters?


[re: MoM] [link to this post]
 
If you are syncing at 80/20 in your router stats at 6dB, then why would you want it to drop to 3dB? It is not like you are going to get more speed. Even if the maximum attainable rate was increased, the ISP on FTTC will still lock it at 80000 kbps Download and 20000 kbps Upload.

6dB 80/20 is exactly the way it should be. The only reason one would want 3dB is if the router is failing to sync at the maximum settings. Higher dB and higher speed attainability is usually a characteristic of a good and clean line.

Usually a bad line and crosstalk would want to force 3dB to achieve max sync speeds, which is not what anyone wants.
Standard User wolvesmad
(knowledge is power) Wed 19-Feb-20 21:53:34
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Re: 3db SNR - DLM Parameters?


[re: BLaZiNgSPEED] [link to this post]
 
Sync speed is 68/20

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EE Fibre Plus 68|20Mb
Standard User MoM
(learned) Wed 19-Feb-20 22:02:30
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Re: 3db SNR - DLM Parameters?


[re: wolvesmad] [link to this post]
 
Sad days you don't live close enough to the green cab
Standard User adslmax
(knowledge is power) Thu 20-Feb-20 01:06:43
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Re: 3db SNR - DLM Parameters?


[re: wolvesmad] [link to this post]
 
In reply to a post by wolvesmad:
Sync speed is 68/20


If your G.INP is enabled and low retransmission on downstream with snr 6dB then you are far away from the cabinet.

My parents on their FTTC got G.INP enabled and low retransmission on downstream with snr 3dB for their connection sync at 67/20 as their cabinet approx 450m away.
Standard User BLaZiNgSPEED
(member) Thu 20-Feb-20 15:17:15
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Re: 3db SNR - DLM Parameters?


[re: wolvesmad] [link to this post]
 
In reply to a post by wolvesmad:
Sync speed is 68/20
Wait for DLM to see if it will readjust. Take a look at the https://www.dslchecker.bt.com/adsl/ADSLChecker.Addre... checker! What does it say for your line, max speeds?

This should give you an indicator if your line is capable of faster speeds.

Now I don't know if it is the rain or the storm that has to do with the reduced noise margins. In my case there is a drop in my noise margin.

Line 1
Downstream Upstream
Actual Rate [Kbps] 80000 19999
Maximum Rate [Kbps] 80534 19999
Noise Margin [dB] 5.90 15.10
Attenuation [dB] 17.90 0.00
Power [dBm] 13.00 7.60

Drop from 6.40dB to 5.90dB and my Upload has dropped from 15.40dB to 15.10dB! Now I blame this on the rain and storm, but my connection sync has remained so far stable 14 days at full 80000Kbps sync, so I am pleased for now as long as it doesn't drop any further.

I am around 300 meters from cabinet. It was like 68/20 when I first joined TalkTalk on the 3rd of Feb and then it jumped to 80/20 after a few days and initially I was getting only 66-69 Mbps in speed test despite 80000 but then after 3-4 days it suddenly started giving me speed tests of 75-80 Mbps.

Things can improve, make sure Faceplate MK4 is installed and there aren't any other internal wiring issues. Use Cat 5/6/7 cables instead of WiFi.
Standard User MHC
(sensei) Thu 20-Feb-20 15:41:07
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Re: 3db SNR - DLM Parameters?


[re: BLaZiNgSPEED] [link to this post]
 
In reply to a post by BLaZiNgSPEED:
Downstream Upstream
Actual Rate [Kbps] 80000 19999
Maximum Rate [Kbps] 80534 19999
Noise Margin [dB] 5.90 15.10
Attenuation [dB] 17.90 0.00
Power [dBm] 13.00 7.60


Something a little odd with your figures though. With a 15dB upstream margin, I would expect to see a Max Rate (Achievable) of well over 20000, probably around 25000 to 28000 with an Actual of 20000/19999/19998.

Downstream, suggests you may already have a 5dB profile/target. If you did not, then the Max would be sub 80000


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M H C


taurus excreta cerebrum vincit
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