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[mrk26]

Old eci on my line sync with just over 78Mb/s. I need only - 0.8db on snr to get full sync of 80Mb/s or 79.999Mb/s 

[Alex Atkin UK]

You must have less crosstalk than me.

[mrk26]

If believed bt info to my cabinet is connected 340 properties. I see on other cabinets in my town numbers of over 600 (on eci), so I guess mine is not bad yet.

[Alex Atkin UK]

I seem to be REALLY benefitting from the FEC downstream on my worse line, although clearly not perfect:

Code: [Select]

Attain Data Rate: 68.861 Mb/s / 20.693 Mb/s
Actual Data Rate: 68.922 Mb/s / 20.000 Mb/s
Impulse Noise Prot: 0.0 sym / 0.0 sym
Interleave Delay: 0.0 ms / 0.0 ms
NFEC: 255 / 255
RFEC: 16 / 16
LSYMB: 18469 / 5410
Interleave Depth: 1 / 1
Interleave Block: 255 / 255
LPATH: 0 / 0
Line Attenuation: 12.2dB / 14.9dB
Signal Attenuation: 12.3dB / 14.7dB
Noise Margin: 3.2dB / 6.0dB
Transmit power: 15.1dBm / 5.5dBm
FECS: 78466464 / 253493
ES: 1326 / 29610
SES: 0 / 61
LOSS: 0 / 0
UAS: 64 / 64
HEC: 0 / 0
CRC_P: 0 / 0
CRCP_P: 0 / 0
15m Code Violations: 10 / 2
15m FEC Errors: 1741104 / 4
1d Code Violations: 196 / 10
1d FEC Errors: 16896694 / 54
Noteworthy is that I have transferred way way more traffic on my good line, but:

Code: [Select]

Attain Data Rate: 81.055 Mb/s / 24.099 Mb/s
Actual Data Rate: 73.993 Mb/s / 20.000 Mb/s
Impulse Noise Prot: 0.0 sym / 0.0 sym
Interleave Delay: 0.0 ms / 0.0 ms
NFEC: 255 / 255
RFEC: 16 / 16
LSYMB: 19851 / 5410
Interleave Depth: 1 / 1
Interleave Block: 255 / 255
LPATH: 0 / 0
Line Attenuation: 13.0dB / 15.3dB
Signal Attenuation: 13.0dB / 15.2dB
Noise Margin: 3.7dB / 6.8dB
Transmit power: 13.8dBm / 4.5dBm
FECS: 16157 / 2330
ES: 382 / 17451
SES: 0 / 3
LOSS: 0 / 0
UAS: 77 / 77
HEC: 0 / 0
CRC_P: 0 / 0
CRCP_P: 0 / 0
15m Code Violations: 0 / 0
15m FEC Errors: 39 / 5
1d Code Violations: 10 / 12
1d FEC Errors: 433 / 37

[mrk26]

I seem to be REALLY benefitting from the FEC downstream on my worse line, although clearly not perfect:

Code: [Select]

Attain Data Rate: 68.861 Mb/s / 20.693 Mb/s
Actual Data Rate: 68.922 Mb/s / 20.000 Mb/s
Impulse Noise Prot: 0.0 sym / 0.0 sym
Interleave Delay: 0.0 ms / 0.0 ms
NFEC: 255 / 255
RFEC: 16 / 16
LSYMB: 18469 / 5410
Interleave Depth: 1 / 1
Interleave Block: 255 / 255
LPATH: 0 / 0
Line Attenuation: 12.2dB / 14.9dB
Signal Attenuation: 12.3dB / 14.7dB
Noise Margin: 3.2dB / 6.0dB
Transmit power: 15.1dBm / 5.5dBm
FECS: 78466464 / 253493
ES: 1326 / 29610
SES: 0 / 61
LOSS: 0 / 0
UAS: 64 / 64
HEC: 0 / 0
CRC_P: 0 / 0
CRCP_P: 0 / 0
15m Code Violations: 10 / 2
15m FEC Errors: 1741104 / 4
1d Code Violations: 196 / 10
1d FEC Errors: 16896694 / 54
Noteworthy is that I have transferred way way more traffic on my good line, but:

Code: [Select]

Attain Data Rate: 81.055 Mb/s / 24.099 Mb/s
Actual Data Rate: 73.993 Mb/s / 20.000 Mb/s
Impulse Noise Prot: 0.0 sym / 0.0 sym
Interleave Delay: 0.0 ms / 0.0 ms
NFEC: 255 / 255
RFEC: 16 / 16
LSYMB: 19851 / 5410
Interleave Depth: 1 / 1
Interleave Block: 255 / 255
LPATH: 0 / 0
Line Attenuation: 13.0dB / 15.3dB
Signal Attenuation: 13.0dB / 15.2dB
Noise Margin: 3.7dB / 6.8dB
Transmit power: 13.8dBm / 4.5dBm
FECS: 16157 / 2330
ES: 382 / 17451
SES: 0 / 3
LOSS: 0 / 0
UAS: 77 / 77
HEC: 0 / 0
CRC_P: 0 / 0
CRCP_P: 0 / 0
15m Code Violations: 0 / 0
15m FEC Errors: 39 / 5
1d Code Violations: 10 / 12
1d FEC Errors: 433 / 37

Your second line is very similar to mine :

Code: [Select]

Line Mode: G.993.2 (VDSL2) — Annex B — Profile 17a
Status & Uptime: UP — 14d 14h 44m 28s — Resyncs: 2
Line State: showtime_tc_sync [0x801]
Power Mode: L0 - Synchronized

Downstream — Upstream

Attainable Line Speed: 80.736 Mb/s — 22.908 Mb/s
Actual Line Speed: 79.995 Mb/s — 20.000 Mb/s
Trellis: D: ON — U: ON
Bitswap: D: ON — U: ON
G.INP: D: Not Enabled — U: Not Enabled
Virtual Noise Support: D: Not Supported — U: Not Supported
Interleave Depth: 1 — 1
Interleave Block: 255 — 255
Interleave Delay: 0.0 ms — 0.0 ms
INP: 0.0 — 0.0
NFEC: 255 — 255
RFEC: 16 — 16
LSYMB: 21451 — 5410
LPATH: 0 — 0
Line Attenuation: 13.0 dB / 11.4 dB
Noise Margin/SNR: 5.3 dB / 6.6 dB
Transmit Power: 1.2 dBm / 1.1 dBm

Errors Since Line Up
FECS: 54509 — 20569
ES: 2736 — 36398
SES: 0 — 67
LOSS: 0 — 1519
UAS: 77 — 77
HEC: 0 — 0
CRC_P: 1899 — 0
CRCP_P: 0 — 0

Errors in 15 Minutes
Code Violations: 3 — 2
FECS: 24 — 15

Errors in 1 Day
Code Violations: 37 — 28
FECS: 507 — 245

[Alex Atkin UK]

I was afraid of this, looks like DLM took offense at my Plusnet line despite the fact I didn't notice any real-world issues with it.
Strange thing is I'm now having huge delays loading pages since DLM intervened.

Code: [Select]

Line Uptime: 4h 4m 20s
Attain Data Rate: 70.820 Mb/s / 21.086 Mb/s
Actual Data Rate: 61.042 Mb/s / 20.000 Mb/s
Impulse Noise Prot: 3.0 sym / 0.0 sym
Interleave Delay: 8.0 ms / 0.0 ms
NFEC: 85 / 255
RFEC: 16 / 16
LSYMB: 18888 / 5410
Interleave Depth: 889 / 1
Interleave Block: 85 / 255
LPATH: 0 / 0
Line Attenuation: 12.3dB / 15.0dB
Signal Attenuation: 12.3dB / 14.9dB
Noise Margin: 3.5dB / 6.2dB
Transmit power: 14.3dBm / 5.5dBm
FECS: 47092 / 105
ES: 1454 / 29632
SES: 0 / 61
LOSS: 3 / 0
UAS: 102 / 102
HEC: 0 / 0
CRC_P: 0 / 0
CRCP_P: 0 / 0
15m Code Violations: 0 / 0
15m FEC Errors: 1083 / 3
1d Code Violations: 372 / 34
1d FEC Errors: 27197140 / 187

[mrk26]

How often during the day you re-sync your modem? I remember something that you play with it, as you see mine is running now over 14 days as it is without issues.
You should increase your snr, by reducing DLM may intervene even more, especially where you are on interleave. Add up at least 2db to downstream and see if DLM will not forgive 
When I was on Interleave I always increase snr to make line more stable, and always works.

[Alex Atkin UK]

That was literally the first time that line was resynced as it was happily sailing along at 3.4dB SNR, it was the Zen line I was playing with as its such a clean line and potentially could hit full sync.

[mrk26]

That's weird, you played with other line and this one payed for?
Any idea why line is capped? Also not sure if that matters but on your lines transmit power is a lot higher (specially downstream) compared to mine, even on broadcom modem I had similar values to my present.

[Alex Atkin UK]

That's weird, you played with other line and this one payed for?
Any idea why line is capped? Also not sure if that matters but on your lines transmit power is a lot higher (specially downstream) compared to mine, even on broadcom modem I had similar values to my present.

Yeah its the good (Zen) line that appears capped, the Plusnet line was correctly hitting 3.4dB SNRm and I had no motivation to try pushing it harder due to the high FECs.  But it wasn't causing any problems, the only drop in sync was 2am when DLM stuck interleaving on that lines downstream.

So apparently DLM must look at FECs, or perhaps the unavailable seconds?  You'd think it wouldn't bother if its not causing any obvious issues.  All that I think might have been happening is peak throughput dropped a little at peak time, as you'd kinda expect.  Its kinda hard to say due to being load balanced, as I never know what is going through which line.  But I was hitting 110-125Mbit combined throughput without dropping sync.

[mrk26]

I'm not sure if FEC errors are considered on fastpatch, definitely ES are. If FEC errors will be considered your slower line should be affected by looking on amount of these errors. From this what I observed on my line is either too much ES errors or too many modem disconnections is what push DLM to action. However since I'm on fastpatch (good three months constantly) DLM didn't action on my line even once, and I did have several disconnections (testing different modems).