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Author Topic: FTTC - Interleaved again!  (Read 5390 times)

HitmanAlex

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Re: FTTC - Interleaved again!
« Reply #45 on: November 20, 2021, 07:51:03 PM »

I suspect it would have been the AC balance of the pair.

Yeah which seemed to have stopped interleaving, Line was stable etc. I can only assume that its gone to fault again or maybe something new?
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HitmanAlex

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Re: FTTC - Interleaved again!
« Reply #46 on: November 27, 2021, 03:07:58 PM »

So i have changed my MTU from 1500 (SKY FTTC) to 1492.

I am now no longer interleaved not sure if this was just luck?

 VDSL Port Details       Upstream         Downstream
               Line Rate:     19.090 Mbps       52.466 Mbps
    Actual Net Data Rate:     19.066 Mbps       52.381 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        6.2 dB            7.8 dB
            Actual Delay:          0 ms              0 ms
          Transmit Power:        6.8 dBm           6.9 dBm
           Receive Power:       -6.9 dBm          -8.4 dBm
              Actual INP:        0.0 symbols       0.0 symbols
       Total Attenuation:        0.0 dB          20.0 dB
Attainable Net Data Rate:     19.403 Mbps       57.804 Mbps


Interestingly Attainable is higher even without interleave? Also my SNR Margin is 7.8 when normally 6.

Anyone have an idea? I know there was mention of a crosstalker potentially no longer being in play here?
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j0hn

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Re: FTTC - Interleaved again!
« Reply #47 on: November 27, 2021, 04:45:46 PM »

So i have changed my MTU from 1500 (SKY FTTC) to 1492.

Definitely unrelated.

Also 1500 was the correct MTU for Sky
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HitmanAlex

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Re: FTTC - Interleaved again!
« Reply #48 on: November 27, 2021, 06:06:41 PM »

Hi John,

Should i change the MTU back to 1500? Or should i avoid a resync?

Strange numbers showing considering i thought higher SNR mean's lower Downstream sync rate?
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HitmanAlex

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Re: FTTC - Interleaved again!
« Reply #49 on: November 27, 2021, 06:13:09 PM »

MTU back to 1500 and resync

   VDSL Port Details       Upstream         Downstream
               Line Rate:     19.213 Mbps       58.140 Mbps
    Actual Net Data Rate:     19.189 Mbps       58.046 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        6.0 dB            6.2 dB
            Actual Delay:          0 ms              0 ms
          Transmit Power:        6.8 dBm           6.9 dBm
           Receive Power:       -7.0 dBm          -8.2 dBm
              Actual INP:        0.0 symbols       0.0 symbols
       Total Attenuation:        0.0 dB          20.0 dB
Attainable Net Data Rate:     19.186 Mbps       58.074 Mbps

Oddly tho i am unable to utilize past 50Mbps on either fast.com or speedtest.net.

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g3uiss

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Re: FTTC - Interleaved again!
« Reply #50 on: November 27, 2021, 06:14:34 PM »

Earlier in the thread the SNRM was explained. Itís not quite as you state, the slightly higher SNRM, is likely the line synced at a lower figure than the max hence the SNRM Is VERY slightly higher. I would really leave it alone unless itís stopping you using the service.
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g3uiss

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Re: FTTC - Interleaved again!
« Reply #51 on: November 27, 2021, 06:15:36 PM »

Definitely leave it now, thatís as good as itís going to get ,
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Chrysalis

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Re: FTTC - Interleaved again!
« Reply #52 on: November 27, 2021, 06:21:17 PM »

Note if you separate the router from the modem, changing PPP parameters(such as MTU) doesnt cause a resync, and wont even on "some" modems used as a router.
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HitmanAlex

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Re: FTTC - Interleaved again!
« Reply #53 on: November 27, 2021, 07:42:32 PM »

Earlier in the thread the SNRM was explained. Itís not quite as you state, the slightly higher SNRM, is likely the line synced at a lower figure than the max hence the SNRM Is VERY slightly higher. I would really leave it alone unless itís stopping you using the service.

Thanks g3uiss i'll leave as is now as per my latest post. Hopefully it stays stable.

Note if you separate the router from the modem, changing PPP parameters(such as MTU) doesnt cause a resync, and wont even on "some" modems used as a router.

Yeah I noticed this and did a xdslctl connection --down and then --up to resync.

Interleaving is now gone however I'm surprised i cannot reach the 58Mbps? It's as if its wrongly providing 58Mbps hiding the true value.

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Chrysalis

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Re: FTTC - Interleaved again!
« Reply #54 on: November 27, 2021, 07:53:18 PM »

Thanks g3uiss i'll leave as is now as per my latest post. Hopefully it stays stable.

Yeah I noticed this and did a xdslctl connection --down and then --up to resync.

Interleaving is now gone however I'm surprised i cannot reach the 58Mbps? It's as if its wrongly providing 58Mbps hiding the true value.



Ok I worded it wrong, you dont need to resync to apply new MTU settings, so if you manually did it, no need to do it again if you adjust the MTU.
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HitmanAlex

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Re: FTTC - Interleaved again!
« Reply #55 on: November 30, 2021, 08:19:33 PM »

Hi Guys,

Thoughts? It seems likely i will be put back onto interleaving?

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j0hn

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Re: FTTC - Interleaved again!
« Reply #56 on: November 30, 2021, 08:29:29 PM »

It's certainly possible.

You could try capping the sync speed a little. It lowers the number of ES a line gets. The lower you cap it, the lower the ES.

A good balance would be capping the line roughly at the speed the line syncs at when interleaved.
That maintains the low latency with the same sync speed you would get when interleaved.

Capping my line was the only way to maintain fastpath.

See this thread for more info
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neil

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Re: FTTC - Interleaved again!
« Reply #57 on: December 01, 2021, 03:12:36 AM »

I suspect it would have been the AC balance of the pair.

what is that?
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tubaman

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Re: FTTC - Interleaved again!
« Reply #58 on: December 01, 2021, 08:44:32 AM »

If you do get interleaved again does an 8ms delay really make that much of a difference to how you use the connection as I'm not sure I'd even notice it?
 :)
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g3uiss

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Re: FTTC - Interleaved again!
« Reply #59 on: December 01, 2021, 12:26:26 PM »

I made the comment about the interleave delay earlier in the post. It rarely causes any issues, as it actually fixes them !
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