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Author Topic: Is a QLN graph supposed to look this lumpy?  (Read 362 times)

seajayshome

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Is a QLN graph supposed to look this lumpy?
« on: July 12, 2024, 07:36:53 PM »

Hi - I've just activated some line stats on my VMG1312-B10A and wondered if these line stats are indicative of any problems... in particular the QLN graph is all over the place - is that normal!?

====================================================================================
    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: 57 minutes
====================================================================================
       VDSL Port Details       Upstream         Downstream
               Line Rate:      3.328 Mbps       22.381 Mbps
    Actual Net Data Rate:      3.300 Mbps       22.382 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        6.2 dB            6.7 dB
            Actual Delay:          0 ms              0 ms
          Transmit Power:        6.9 dBm           9.9 dBm
           Receive Power:      -10.1 dBm         -24.8 dBm
              Actual INP:        0.0 symbols      50.0 symbols
       Total Attenuation:        0.0 dB          30.3 dB
Attainable Net Data Rate:      3.300 Mbps       23.412 Mbps
====================================================================================
  VDSL Band Status        U0      U1      U2      U3      U4      D1      D2      D3
  Line Attenuation(dB):    10.4    58.6     N/A     N/A     N/A    25.0    73.1    90.3   
Signal Attenuation(dB):    10.4    57.6     N/A     N/A     N/A    33.5    73.8     N/A   
        SNR Margin(dB):    6.1    6.2     N/A     N/A     N/A    6.6    6.8     N/A   
         TX Power(dBm):    0.2    5.9     N/A     N/A     N/A    8.6    3.8     N/A   
====================================================================================

            VDSL Counters

           Downstream        Upstream
Since Link time = 57 min 47 sec
FEC:      17666      8
CRC:      0      6
ES:      0      6
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
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Chrysalis

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Re: Is a QLN graph supposed to look this lumpy?
« Reply #1 on: July 13, 2024, 06:22:58 AM »

Its been so long since I was regurly looking at these graphs, the only thing that stands out to me is the spiky lines on the far right, I think thats unusual.
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kitz

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Re: Is a QLN graph supposed to look this lumpy?
« Reply #2 on: July 14, 2024, 11:26:35 PM »

Post deleted.   Ive just realised the graphs are much larger than I originally thought. 
Its too wide for me to see it all on my screen and theres more tones at higher frequencies than I originally saw, so what Id typed may have been wrong.

« Last Edit: July 14, 2024, 11:33:06 PM by kitz »
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