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Beginner
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Message 1 of 5

DLM Reset

Hey there, 

 

Hoping somebody can help me out with a DLM Reset if possible. Speeds have gradually been dropping since September last year and had some instability last few months leading to drop outs, pings have climbed but has not recovered. 

Router stats and info from BTW included. 

 

Screenshot 2020-07-08 at 14.03.51.jpgScreenshot 2020-07-08 at 14.03.30.jpg

 
====================================================================================
    VDSL Training Status:   Showtime
                    Mode:   VDSL2 Annex B
            VDSL Profile:   Profile 17a
                G.Vector:   Disable
            Traffic Type:   PTM Mode
             Link Uptime:   0 day: 0 hour: 46 minutes
====================================================================================
       VDSL Port Details       Upstream         Downstream
               Line Rate:     20.202 Mbps       63.522 Mbps
    Actual Net Data Rate:     20.000 Mbps       63.404 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        9.4 dB            7.7 dB
            Actual Delay:          0 ms              9 ms
          Transmit Power:        3.6 dBm           3.6 dBm
           Receive Power:       -6.1 dBm          -2.6 dBm
              Actual INP:        0.0 symbols       5.0 symbols
       Total Attenuation:        0.0 dB          14.2 dB
Attainable Net Data Rate:     25.017 Mbps       92.077 Mbps
====================================================================================
  VDSL Band Status        U0      U1      U2      U3      U4      D1      D2      D3
  Line Attenuation(dB): 0.5 16.0 26.6  N/A  N/A 9.0 21.8 33.0
Signal Attenuation(dB): 0.4 15.8 26.6  N/A  N/A 11.2 21.5 33.0
        SNR Margin(dB): 11.3 10.4 9.0  N/A  N/A 7.7 7.7 7.7
         TX Power(dBm):-5.8-35.2 3.0  N/A  N/A 8.2 7.5 7.3
====================================================================================
 
            VDSL Counters
 
           Downstream        Upstream
Since Link time = 46 min 55 sec
FEC: 8124 2
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 2 min 23 sec
FEC: 689 1
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 509 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 47 min 23 sec
FEC: 8124 2
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 27 27
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Total time = 47 min 23 sec
FEC: 8124 2
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 27 27
LOS: 0 0
LOF: 0 0
LOM: 0 0
====================================================================================

 

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4 REPLIES 4
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Distinguished Sage
Distinguished Sage
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Message 2 of 5

Re: DLM Reset

Until the instability is fixed there is absolutely no point in a DLM reset as DLM will just lower your speed again.

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Highlighted
Beginner
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Message 3 of 5

Re: DLM Reset

Thanks for your input.

I've suspected its been a hardware issue used the Openreach ECI VDSL router had recently changed over to the zyxel vmg8924-b10a which has been better but DLM still doing its tricks. Previously had 79/20 out of it which is a real shame about the drop. 

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Highlighted
Beginner
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Message 4 of 5

Re: DLM Reset

Just wanted too post an update. Issue has been caused by a bridge tap which was not noticed by the engineer that came to install the connection first time around. 

 

Bridge Tap has been removed so a DLM reset would now be advantageous 

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Highlighted
Sage
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Message 5 of 5

Re: DLM Reset

Once DLM sees the line as stable it should automatically reset itself. A DLM reset cannot be performed on VDSL the same way as ADSL.

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