In reply to a post by Chrysalis:

the hg612 can only tweak adsl snrm not vdsl snrm.

This is patently untrue. Maybe you mean you can't do it because of DLM?

I havent tried to do it, but its clear on the telnet layout its an adsl command only.

Plus a few have tried it on the kitz forums and had no affect but then when tried on a fritz worked fine.

DLM would only stop the adjustment if someone tried to overcome banding (an actual min/max speed cap). FTTC defaults to a 6db snrm with cap of the product spec.

In reply to a post by Chrysalis:

I havent tried to do it

Figures

but its clear on the telnet layout its an adsl command only.

Clear? How? It's called xdslcmd rather than adslcmd for the obvious reason that the command applies to both.

I tried the tweak on my VDSL2 connection a long time ago & I can confirm it had no effect whatsoever.
I have tried both increasing & decreasing SNRM, just for testing purposes, but mainly to see if I could achieve sync at a lower SNRM (say 3dB) to try to increase sync speeds as my SNRM doesn't usually drop much below 6dB.


It seems that 6dB is the minimum 'target' SNRM that DLM on a VDSL2 connection will allow.

e.g. my conection is too far from the cabinet to get anywhere near the 40Mb cap for my 40/10 service.
Even though my DS sync speed has now dropped from around 30Mb in December to currently just over 20Mb, SNRM is still around 6dB or so, occasionally increasing to 7dB or so in the D2 band.

However, users much closer to the cabinet, where their attainable rates exceed the 40Mb or 80Mb caps, do see higher SNRM values when in sync at the 40Mb or 80Mb cap (as high as 30dB in some extreme cases - Attainable rate around 130Mb on a 40Mb capped service):-

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Retrain Reason: 0 Max:    Upstream rate = 41318 Kbps, Downstream rate = 129700 KbpsPath:   0, Upstream rate = 10000 Kbps, Downstream rate = 39998 Kbps  Discovery Phase (Initial) Band Plan US: (0,95) (868,1207) (1972,2783) DS: (32,859) (1216,1963) (2792,3939) Medley Phase (Final) Band PlanUS: (0,95) (868,1207) (1972,2783) DS: (32,859) (1216,1963) (2792,3939)        VDSL Port Details       Upstream        Downstream Attainable Net Data Rate:      41318 kbps        129700 kbpsActual Aggregate Tx Power:    -   8.6 dBm          13.3 dBm ============================================================================  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3   Line Attenuation(dB):  2.2     7.8     10.0     N/A    4.4     9.2     13.8   Signal Attenuation(dB):  0.0      N/A    7.2      N/A    4.4     9.2     13.8           SNR Margin(dB):  30.7     N/A    30.8     N/A    31.4    31.2    31.4            TX Power(dBm): -25.1   -128.0  -10.2     N/A    10.5    7.7     6.2                    Down            UpSNRM(dB):        31.4            30.8 LATN(dB):        0.0             0.0SATN(dB):        0.0             0.0 TxPwr(dBm):      13.3           -8.6ATTNDR(Kbps):   129700          41294

The HG612 SNRM tweak does work on ADSL connections, but it does appear that DLM blocks the tweak on VDSL2 connections.

I have seen comments that the tweak does work via a Fritz!Box, but I can't personally confirm the validity of those comments.

debate settled, I tested on the fritz 3370, both 9db and 3db work fine. Bear in mind can reduce snrm on the fritz by editing the config file manually as the gui only allows adjusting it upwards.

In reply to a post by Chrysalis:

debate settled, I tested on the fritz 3370, both 9db and 3db work fine.

In what way do they "work fine"?

I believe he means it successfully changed the target margin.

Edited by deleted (Sun 19-May-13 14:46:56)

Did anything else change?

I had in mind something relating to the Subject of the thread - FTTC IP Profile, Sync speed or even Modem max downstream rate?

Edited by deleted (Sun 19-May-13 15:14:03)

In reply to a post by Chrysalis:

debate settled, I tested on the fritz 3370, both 9db and 3db work fine. Bear in mind can reduce snrm on the fritz by editing the config file manually as the gui only allows adjusting it upwards.

Anyone know if it works with the Billion routers - either the 7800 connected as a router to the modem [if that would work?] or the newer 8200 VDSL modem/router, assuming it still supports the facility? You can drop the target SNR Margin by up to 15dB if you are really in trouble (at least with the 7800)...

well yes of course.

the sync speed changed and the noise margin changed.

I know how to see if it works thank you.

I didnt need to test it tho as someone else on kitz forum had already proven it works. But I did it just to be sure.

Note I am on a ECI dslam, there is a chance HG dslams react different, but the only time I think a adjustment will be blocked is if the line is banded and the banding overides the target snrm.

Edited by Chrysalis (Sun 19-May-13 19:48:23)