FTTC - Line Quality - Downstream line rate decreased
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FTTC - Line Quality - Downstream line rate decreased
24-02-2021 1:03 PM
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Hi,
My download speed decreased a few days ago, I was getting 55meg and now I get 40meg.
I have been using the same modem/router (a TT HG635) for years until I tried a new one last October which kept restarting itself so I sent it back after 2 weeks and went back the TT HG635 which has been fine until last week.
I've tried another modem/router which is also showing the same downstream line rate.
I take screen grabs of my router settings from time to time just in case I need to setup a new one, and I can see the Downstream line rate is now lower:
Line Quality | Now | Previously |
Upstream line rate (kbit/s): | 14399 | 12758 |
Downstream line rate (kbit/s): | 46094 | 62723 |
Upstream noise safety coefficient (dB): | 5.9 | 6.4 |
Downstream noise safety coefficient (dB): | 6.4 | 3.3 |
Upstream interleave depth: | 0 | 0 |
Downstream interleave depth: | 0 | 0 |
Line standard: | VDSL | VDSL |
Upstream line attenuation (dB): | 29.5 | 30.5 |
Downstream line attenuation (dB): | 14.3 | 14.6 |
Upstream output power (dBm): | 7.5 | 7.5 |
Downstream output power (dBm): | 13.3 | 13.3 |
Downstream interleave depth: | None | None |
It looks like the Downstream noise safety coefficient has increased (almost doubled), I wonder if the very windy conditions have caused an issue? my line to my house is overhead.
I have the Technicolor TG582n and 2 x Openreach modems which I will try, but finding the time between zoom lessons and teams meetings can be difficult.
- Product: Unlimited Fibre Extra
- Estimated Download Range: 36 - 55Mbps
- Estimated Upload Range: 9 - 14Mbps
- Minimum Guaranteed Speed: 31.8Mbps
- Current Line Speed (Download): 62.6Mbps
Re: FTTC - Line Quality - Downstream line rate decreased
24-02-2021 1:34 PM - edited 24-02-2021 1:35 PM
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It looks like the Downstream noise safety coefficient has increased (almost doubled), I wonder if the very windy conditions have caused an issue? my line to my house is overhead.
Yes, it looks like previously your line was on a 3db Target SNR. The DLM seems to have decided that the line is no longer sufficiently error free to maintain the 3db and has reset to a 6db Target. This will have reduced the maximum attainable speed.
If the errors only increased on a temporary basis then the DLM SHOULD reduce the target back to 3db (eventually!) and your speed should go back up
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
Re: FTTC - Line Quality - Downstream line rate decreased
24-02-2021 2:04 PM
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Thank you for the explanation.
I will see how it goes, 40 meg is ok for now.
I'll check the RJ11 connection (I had replaced the cable back in October) and try with other cables.
Strange how my upstream has increased.
Re: FTTC - Line Quality - Downstream line rate decreased
25-02-2021 9:46 AM
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I've not had time to check / swap the 'internet cable' yet but it looks like the downstream noise has decreased.
So I think that means DLM has increased the Downstream line rate.
Upstream line rate (kbit/s): 14283
Downstream line rate (kbit/s): 57136
Upstream noise safety coefficient (dB): 5.9
Downstream noise safety coefficient (dB): 5.4
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