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Author Topic: ZyXEL VMG1312-B10a - Fix SNR Margin?  (Read 201 times)

seajayshome

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  • Posts: 10
ZyXEL VMG1312-B10a - Fix SNR Margin?
« on: July 08, 2024, 04:37:47 PM »

Hi all - I recently got hold of a second hand VMG1312-B10a to use on my TalkTalk FTTC line.  (I had been using my old Sky router, as the TalkTalk one wouldn't work properly with some of my devices).  The Sky router was fine but locked down and had little user control on it.

When  I had Sky it used to sync at about 3dB SNR and was very stable at that.  Since moving to TalkTalk it never goes below 6dB SNR, and is still stable, but I wondered if it was possible to ask the router to target the lower SNR - and hence faster speed?

Anyone know if this is possible from the command line on the VMG1312-B10a, and if it is likely to work?

Current stats:

====================================================================================
    VDSL Training Status:   Showtime
                    Mode:   VDSL2 Annex B
            VDSL Profile:   Profile 17a
                G.Vector:   Disable
            Traffic Type:   PTM Mode
             Link Uptime:   1 day: 22 hours: 15 minutes
====================================================================================
       VDSL Port Details       Upstream         Downstream
               Line Rate:      3.251 Mbps       21.637 Mbps
    Actual Net Data Rate:      3.223 Mbps       21.638 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        6.4 dB            7.3 dB
            Actual Delay:          0 ms              0 ms
          Transmit Power:        6.9 dBm           9.8 dBm
           Receive Power:      -10.2 dBm         -24.3 dBm
              Actual INP:        0.0 symbols      52.0 symbols
       Total Attenuation:        0.0 dB          29.5 dB
Attainable Net Data Rate:      3.223 Mbps       22.946 Mbps
====================================================================================
  VDSL Band Status        U0      U1      U2      U3      U4      D1      D2      D3
  Line Attenuation(dB):    10.4    58.8     N/A     N/A     N/A    24.2    73.3    90.3   
Signal Attenuation(dB):    10.4    58.0     N/A     N/A     N/A    33.0    73.9     N/A   
        SNR Margin(dB):    6.5    6.4     N/A     N/A     N/A    7.3    7.3     N/A   
         TX Power(dBm):    0.1    5.9     N/A     N/A     N/A    8.6    3.7     N/A   
====================================================================================

           Downstream        Upstream
Total time = 1 days 23 hours 16 min 57 sec
FEC:      641503      520
CRC:      0      309
ES:      0      289
SES:      0      0
UAS:      28      28
LOS:      0      0
LOF:      0      0
LOM:      0      0
« Last Edit: July 08, 2024, 05:16:40 PM by seajayshome »
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tubaman

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  • Posts: 12855
Re: ZyXEL VMG1312-B10a - Fix SNR Margin?
« Reply #1 on: July 08, 2024, 06:32:34 PM »

If you are on a Local Loop Unbundled (LLU) TalkTalk connection then I believe they use their own DLM and that might be why it's fixed at 6dB. As for manually tweaking it, you can cap the sync to force it up and thus reduce errors but you can't force it down.
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