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[beta_tester]

I've been having issues with my broadband for weeks now. I live in a new estate with new wiring, but (according to an Openreach engineer), the quality of the cabling from the estate to the cabinet is pretty bad.

Last year I was getting about 60 Mbps downstream and 9.5 Mbps upstream.

However, things have got bad pretty quickly - with my Plusnet Hub I am getting about 43 Mbps and 3.8 Mbps (upstream has dropped 2 Mbps in the last week alone).

Plusnet have been pretty sh*t at dealing with it. They sent a copper engineer out as they detected a fault at the exchange, and when that didn't improve the speeds, sent another copper engineer out! Trying to get them to send a broadband-trained engineer out at the moment.

However, in the meantime I managed to obtain a EchoLife HG612 and so have been running with that today, and the stats are even worse with that. Currently getting 24 Mbps down and 4 Mbps up!!!

Any help would be greatly appreciated. My stats from the EchoLife are attached. My line length is about 760m.

[beta_tester]

Stats from my OpenWrt router:-

Line State:UP [0x0]
Line Mode:G.993.2 (VDSL2)
Line Uptime:43s
Annex:B
Profile:17a
Data Rate:32.174 Mb/s / 3.712 Mb/s
Max. Attainable Data Rate (ATTNDR):41.320 Mb/s / 3.712 Mb/s
Latency:8.0 ms / 0.0 ms
Line Attenuation (LATN):22.0 dB / 29.0 dB
Signal Attenuation (SATN):20.4 dB / 28.4 dB
Noise Margin (SNR):10.0 dB / 6.1 dB
Aggregate Transmit Power (ACTATP):3.7 dB / 12.9 dB
Forward Error Correction Seconds (FECS):0 / 0
Errored seconds (ES):131 / 15149
Severely Errored Seconds (SES):0 / 28
Loss of Signal Seconds (LOSS):0 / 3
Unavailable Seconds (UAS):828 / 828
Header Error Code Errors (HEC):0 / 0
Non Pre-emptive CRC errors (CRC_P):134 / 0
Pre-emptive CRC errors (CRCP_P):0 / 0
ATU-C System Vendor ID:Broadcom 192.20
Power Management Mode:L0 - Synchronized

[mofa2020]

Welcome to the forum 

There is a difference between how DLM acted with both devices I guess because chipsets on both devices are not the same so that would be expected sometimes.

• For the HG612 at the current line condition the maximum the line can handle is 24529Kbps / 4152Kbps and current SNRm ~ 6.xdb both sides so the actual speed is the maximum line can handle. 
• For the Plusnet Hub at the same current line condition the line can perform better which is reflected in higher Max. Attainable Data Rate (ATTNDR):41.320 Mb/s / 3.712 Mb/s but as you can see download SNRm is @ 10.0db so DLM took action to hold the data rate at 32Mb in order to keep higher SNRm than the usual 6db or even 3db profile yet it applied interleaving on download side "since latency is 8.0ms" as a precaution for a stable service.   

So in conclusion, yup a line may (or let me say will) not perform the same on different modems/routers and this can lead to different DLM actions based on the parameters available. in your case there is something wrong with the line for sure and it is a copper based (as I guess)  as I believe attenuation is high for a FTTC line.

How is the wiring setup for telephone and modem/router?

[j0hn]

The HG612 looks a bit iffy.

Attenuation of 65.3dB...
Am I reading that right?

The line is fastpath with the HG612 and Interleaved on the OpenWRT router.
High SNRM on the OpenWRT device but doesn't appear to be a banded sync.

Next time it's connected can you post the Plusnet Hub stats?
Don't swap modems too often though.

[mofa2020]

Attenuation of 65.3dB...
Am I reading that right?

Yes 65.3db attenuation.

[beta_tester]

Hi - thanks for the replies. The Plusnet router stats were from the day before. The DLM must have taken interleaving off overnight I suspect (not sure why as the error counts have been going up all the time).

The current stats are as below. The downstream has recovered somewhat, but the upstream is stubbornly low - it is now a 1/3 of what it was late last year. It makes working from home somewhat sluggish at times!

The router is plugged directly into a Openreach VDSL plate (MK4?) and there is no internal wiring. I did think the line attenuation looked high - even though my line is relatively long.

Line State:UP [0x0]
Line Mode:G.993.2 (VDSL2)
Line Uptime:1d 4h 5m 58s
Annex:B
Profile:17a
Data Rate:45.646 Mb/s / 3.921 Mb/s
Max. Attainable Data Rate (ATTNDR):45.645 Mb/s / 3.857 Mb/s
Latency:0.0 ms / 0.0 ms
Line Attenuation (LATN):22.0 dB / 29.1 dB
Signal Attenuation (SATN):20.5 dB / 28.5 dB
Noise Margin (SNR):6.0 dB / 6.0 dB
Aggregate Transmit Power (ACTATP):4.2 dB / 13.3 dB
Forward Error Correction Seconds (FECS):0 / 0
Errored seconds (ES):739 / 15257
Severely Errored Seconds (SES):0 / 29
Loss of Signal Seconds (LOSS):9 / 3
Unavailable Seconds (UAS):12404 / 12404
Header Error Code Errors (HEC):0 / 0
Non Pre-emptive CRC errors (CRC_P):193 / 0
Pre-emptive CRC errors (CRCP_P):0 / 0
ATU-C System Vendor ID:Broadcom 192.20
Power Management Mode:L0 - Synchronized

[beta_tester]

Out of interest, the line stats last month were as follows:-

Data Rate:41.363 Mb/s /5.222 Mb/s
Max. Attainable Data Rate (ATTNDR):41.877 Mb/s / 5.138 Mb/s
Latency:8.0 ms / 0.0 ms
Line Attenuation (LATN):22.0 dB / 28.9 dB
Signal Attenuation (SATN):20.5 dB / 28.1 dB
Noise Margin (SNR): 6.1 dB / 5.2 dB
Aggregate Transmit Power (ACTATP):4.0 dB / 13.3 dB Forward Error Correction Seconds (FECS):0/0
Errored seconds (ES): 85 / 14894
Severely Errored Seconds (SES):0/ 28
Loss of Signal Seconds (LOSS):2/3
Unavailable Seconds (UAS):99/99
Header Error Code Errors (HEC):0/0
Non Pre-emptive CRC errors (CRC P):20/0


And from last August:-

GEA Test Detail
Circuit ID NA Service ID
Test Outcome Pass
Test Outcome Code GTC_FTTC_SERVICE_0000
Description GEA service test completed and no fault found .
Main Fault Location OK
Sync Status In Sync
Downstream Speed 61.3 Mbps
Upstream Speed 9.3 Mbps
Appointment Required N
Fault Report Advised N
NTE Power Status PowerOn
Voice Line Test Result Pass
Technology VDSL
Current and Last 15 Minute Bin Performance
Parameters Last Traffic Count(Upto 15 mins) Current Traffic Count(Upto 15 mins)
Start Time Stamp 2019-08-02T12:44:55Z 2019-08-02T12:59:55Z
Ingress Code Violation 2 0
Egress Code Violation 26 6
Errored Seconds 26 6
Severely Errored Seconds 0 0
Unavailable Seconds 0 0

[RealAleMadrid]

The high downstream attenuation shown by the HG612 is very odd, are you sure that the incoming pair is connected OK. It almost looks like a single leg disconnect which may still sync but at a poor speed. However the upstream is better than the other modem which is even more strange.

[beta_tester]

It is really strange that the HG612 is showing far worse attenuation than the std router. Copper engineer was here a couple of weeks ago and found no faults.

Having said that the upstream line attenuation (as reported by the OpenWRT router) has increased by .4db in the last few months. Surely this figure shouldn't change to that degree?!

Also noticed the upstream signal attenuation is all over the place (on a second by second basis). Going up and down by 1db.

[mofa2020]

Line State:UP [0x0]
Line Mode:G.993.2 (VDSL2)
Line Uptime:1d 4h 5m 58s
Annex:B
Profile:17a
Data Rate:45.646 Mb/s / 3.921 Mb/s
Max. Attainable Data Rate (ATTNDR):45.645 Mb/s / 3.857 Mb/s
Latency:0.0 ms / 0.0 ms
Line Attenuation (LATN):22.0 dB / 29.1 dB
Signal Attenuation (SATN):20.5 dB / 28.5 dB
Noise Margin (SNR):6.0 dB / 6.0 dB
Aggregate Transmit Power (ACTATP):4.2 dB / 13.3 dB
Forward Error Correction Seconds (FECS):0 / 0
Errored seconds (ES):739 / 15257
Severely Errored Seconds (SES):0 / 29
Loss of Signal Seconds (LOSS):9 / 3
Unavailable Seconds (UAS):12404 / 12404
Header Error Code Errors (HEC):0 / 0
Non Pre-emptive CRC errors (CRC_P):193 / 0
Pre-emptive CRC errors (CRCP_P):0 / 0
ATU-C System Vendor ID:Broadcom 192.20
Power Management Mode:L0 - Synchronized

How long since your line did get FTTC? cause I have a feeling that is a cross-talk effect as more lines connected in the cabinet, I can see these stats normal and since interleaving is off now error counts will be higher but as long as in the limits (!?) DLM will not take action otherwise it will enable it back if needed. BTW your line attenuation is quite normal under the Plusnet Hub, my line is less than 80 meters long from the cabinet and TP-Link for example shows 6db / 10db (DL/UL) so for your line guess it is in range but for the HG612 it is way off chart given that speed is knocked down severely which makes me think of maybe it is faulty unit specially after giving the Hub sometime and things started to improve.

Maybe under Plusnet Hub download SNRm profile 3db get applied by DLM if things stable so you will gain some more speed out of the line.

[beta_tester]

How long since your line did get FTTC? cause I have a feeling that is a cross-talk effect as more lines connected in the cabinet, I can see these stats normal and since interleaving is off now error counts will be higher but as long as in the limits (!?) DLM will not take action otherwise it will enable it back if needed. BTW your line attenuation is quite normal under the Plusnet Hub, my line is less than 80 meters long from the cabinet and TP-Link for example shows 6db / 10db (DL/UL) so for your line guess it is in range but for the HG612 it is way off chart given that speed is knocked down severely which makes me think of maybe it is faulty unit specially after giving the Hub sometime and things started to improve.

Maybe under Plusnet Hub download SNRm profile 3db get applied by DLM if things stable so you will gain some more speed out of the line.

I spoke too soon. Interleaving has been applied by the DLM overnight and no increase in upstream (still 1/3 of what it was last year). What I can't fathom out is how the upstream went from 5.4Mbps (last week) to 3.8Mbps but still has 6db SNR?

I've had FTTC since we moved here 2 1/2 years ago. It's a new build estate but the last house was occupied 2 years ago

Sent from my HTC U12+ using Tapatalk

[mofa2020]

What about download speed, is it the same?

[beta_tester]

What about download speed, is it the same?

Download down from 62 (last year) to 48 (last month), to 41 (today).

Sent from my HTC U12+ using Tapatalk

[beta_tester]

Managed to get some sense out of Plusnet - they rain a test and an HR fault was detected. Broadband-trained engineer due in the morning. Fingers crossed!!!!

Thanks for all your help and guidance.

[mofa2020]

Happy someone find the problem and took the proper action to solve it, if you don't mind keep us updated.