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Author Topic: Will DLM ever do anything?  (Read 795 times)

underzone

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Re: Will DLM ever do anything?
« Reply #15 on: May 03, 2021, 07:46:10 PM »

Thanks adslmax, I found the info on this forum of course  ;D. The command I used:

adsl configure --maxDataRate 60004 19004 100000
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TalkTalk 80/20, Huawei 288 FTTC cabinet, Zyxel VMG8924-B10A modem & pfsense x64

underzone

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Re: Will DLM ever do anything?
« Reply #16 on: May 04, 2021, 08:33:34 AM »

Last one:

DSLAM type / SW version:   BDCM:0xa4a1 (164.161) / v0xa4a1
Modem/router firmware:     AnnexA version - A2pv6F039v.d26a
DSL mode:                  VDSL2 Profile 17a
Status:                    Showtime
Uptime:                     5 hours 33 min 23 sec
Resyncs:                   0 (since 04 May 2021 08:32:27)
         
                                  Downstream   Upstream
Line attenuation (dB):     16.7      0.0
Signal attenuation (dB):   Not monitored      
Connection speed (kbps):   79998      19999
SNR margin (dB):           3.3      15.5
Power (dBm):               13.4      7.1
Interleave depth:          8      1
INP:                       51.00      0
G.INP:                     Enabled      Not enabled
Vectoring status:          5 (VECT_UNCONFIGURED)   


and:


xdslctl info --stats
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    1
Last initialization procedure status:   0
Max:    Upstream rate = 27549 Kbps, Downstream rate = 81344 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 79998 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
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TalkTalk 80/20, Huawei 288 FTTC cabinet, Zyxel VMG8924-B10A modem & pfsense x64

kitz

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Re: Will DLM ever do anything?
« Reply #17 on: May 04, 2021, 11:58:27 AM »

Quote
I'am well aware that no one knows exactly what parameters DLM monitors with respect to G.Inp re-tx profile selection,

The G.INP 'equivalent' of Err Secs is LEFTRs

Code: [Select]
SEFTR = Severe Loss of error-free throughput
LEFTR = Loss of Error Free Throughput - Count of seconds with a defect

As regards to what causes the DLM to relent its all rather vague especially once the line is banded.  All the documentation I saw indicated that it depends on your ILQ status being green for a period of time.  Observations with lines that had been Interleaved bore this out, bearing in mind that there is also some sort of doubler system in place meaning each subsequent incident requires a longer period of ILQ green.  BTw documentation repeatedly indicates the parameters of interest are ErrSecs and SES and one doc specifically ruled out FEC count.  BS can confirm this as there was an equivalent Openreach doc.   For clarity, absolutely none of the documentation or info came from him and were obtained from other sources long before.  He was just trying to see if anything had been updated.

However, since the ASSIA court case which specifically seemed to target the Openreach DLM some changes were made that seems to make it exceedingly hard to reverse line caps.  Those few that have done so naturally have taken an exceedingly long period of stability.    My own line now must have been capped for over a year.  I do still see that daily dose of SHINE which lasts for <1sec and the rest of the time it is perfectly fine and should have been ILQ green for extremely long periods of time.

I've pondered if the SNRM may be of interest - as there is some sort of linear relationship between the [Target] SNRM and amount of cap in place.  eg incr SNRM by 1.5dB, 3dB etc.    When we artificially limit the line speed it results in an artificially high SNRM.

I started off with the intention of deliberately not artificially restricting my line as an experiment to see if the DLM did relent on its own.  It didn't despite having had what must be months of ILQ green...  then I just got too lazy and too ill to care.  Despite being capped at 60Mbps the line still does most of what I use it for now.   My upstream is still at 20Mbps, but due to my circumstance I don't do any large amounts of uploading these days,  so even what was a much used benefit when I first got FTTC, doesnt get the workout like it used to.         
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adslmax

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  • Posts: 1300
Re: Will DLM ever do anything?
« Reply #18 on: May 04, 2021, 01:03:29 PM »

Last one:

DSLAM type / SW version:   BDCM:0xa4a1 (164.161) / v0xa4a1
Modem/router firmware:     AnnexA version - A2pv6F039v.d26a
DSL mode:                  VDSL2 Profile 17a
Status:                    Showtime
Uptime:                     5 hours 33 min 23 sec
Resyncs:                   0 (since 04 May 2021 08:32:27)
         
                                  Downstream   Upstream
Line attenuation (dB):     16.7      0.0
Signal attenuation (dB):   Not monitored      
Connection speed (kbps):   79998      19999
SNR margin (dB):           3.3      15.5
Power (dBm):               13.4      7.1
Interleave depth:          8      1
INP:                       51.00      0
G.INP:                     Enabled      Not enabled
Vectoring status:          5 (VECT_UNCONFIGURED)   


and:


xdslctl info --stats
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    1
Last initialization procedure status:   0
Max:    Upstream rate = 27549 Kbps, Downstream rate = 81344 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 79998 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps

nice one!  ;D
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adslmax

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  • Posts: 1300
Re: Will DLM ever do anything?
« Reply #19 on: May 04, 2021, 01:06:01 PM »

Thanks adslmax, I found the info on this forum of course  ;D. The command I used:

adsl configure --maxDataRate 60004 19004 100000

Thanks I keep that for future if my line sync drop and stuck at 6dB for too long.

Mine still on sync rate 79999/19999 with max rate 82258/23466 with SNR at 6.5dB/7.4dB
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