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Author Topic: 3dB Target SNRm Live?  (Read 76696 times)

BigJ

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Re: 3dB Target SNRm Live?
« Reply #195 on: March 28, 2017, 10:50:46 AM »

Looking at Vic's stats with my untrained eye, it seems reasonably similar to mine - slightly higher attenuation and roughly the same SNRM levels and hlog graphs. (Although your snrm's much smoother than mine - stats quantisation by the Zyxel modem perhaps?)

So I'm still holding out hope that I get an snrm drop sooner or later!

I thought the same. Probably a slow and measured roll out by BT.
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AngelRex

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Re: 3dB Target SNRm Live?
« Reply #196 on: March 28, 2017, 12:23:38 PM »

Anyone know if the 3db will be applied to the up and down?
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displaced

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Re: 3dB Target SNRm Live?
« Reply #197 on: March 28, 2017, 12:29:46 PM »

Anyone know if the 3db will be applied to the up and down?

Just downstream at the moment.  In fact, the presence of upstream drops can used to figure out whether overall SNRM fall is due to DLM or just a fortunate resync.  Noise-free fortunate resync will lower both, whilst a controlled DLM action will be downstream only.
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vic0239

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Re: 3dB Target SNRm Live?
« Reply #198 on: March 29, 2017, 02:48:45 PM »

Sorry for the running commentary.  :-[

After a further re-sync this morning both my lines are now at 3.3db SNRM on the downstream, so I suppose that will be my new target completed after two interventions.
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Lothian Broadband 900/900 + AAISP VDSL, Vigor2865Vac, MikroTik rb260gsp, ZyXel NWA50AX WiFi AP.

burakkucat

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Re: 3dB Target SNRm Live?
« Reply #199 on: March 29, 2017, 05:43:03 PM »

After a further re-sync this morning both my lines are now at 3.3db SNRM on the downstream, so I suppose that will be my new target completed after two interventions.

Yes, it certainly looks that way.
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AngelRex

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Re: 3dB Target SNRm Live?
« Reply #200 on: March 30, 2017, 12:19:21 PM »

Yes, it certainly looks that way.

So, just to confirm, how much was the increase in downstream compared to db reduced?
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garypower

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Re: 3dB Target SNRm Live?
« Reply #201 on: March 30, 2017, 02:18:33 PM »

My line rebooted just over 8 days ago (after ~ 74 days uptime)

Now holding @ 3.3 / 4.1db

Speed changed from 58,219 / 15,770 to 66,539 / 16,707

Interestingly the last time I went to a low snrm as part of the previous trial the download hit a  banded 59,999 number = this has now been removed :)
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vic0239

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Re: 3dB Target SNRm Live?
« Reply #202 on: March 30, 2017, 03:08:41 PM »

So, just to confirm, how much was the increase in downstream compared to db reduced?

Over the three re-syncs:

                 SNRM db                             Attainable
Line 1  6.4 - 5.3 - 4.3 - 3.3    62,059 - 65,869 - 69,699 - 73,394
Line 2  5.9 - 5.3 - 4.3 - 3.3    60,552 - 62,430 - 66,558 - 69,649

I might be able to squeeze a little more from line 2 as it is affected by line 1 and was the last to re-sync.
« Last Edit: April 01, 2017, 02:42:35 PM by vic0239 »
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Lothian Broadband 900/900 + AAISP VDSL, Vigor2865Vac, MikroTik rb260gsp, ZyXel NWA50AX WiFi AP.

WWWombat

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Re: 3dB Target SNRm Live?
« Reply #203 on: March 31, 2017, 01:37:29 AM »

Can you add the SNRM and speed from before the first step?

As it stands, we can only infer that a 2dB change gave each line about 7.4Mbps.
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vic0239

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Re: 3dB Target SNRm Live?
« Reply #204 on: March 31, 2017, 09:27:58 AM »

Apologies, for some reason I didn't go far enough back.  :-[  I've updated accordingly.
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Lothian Broadband 900/900 + AAISP VDSL, Vigor2865Vac, MikroTik rb260gsp, ZyXel NWA50AX WiFi AP.

Xup

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Re: 3dB Target SNRm Live?
« Reply #205 on: April 01, 2017, 12:44:11 PM »

Re-sync today at 2 PM have dropped from 6db to 5db(been 6db for years), let see how it goes and if it drops to 4db in the coming weeks.

Re-sync at 8AM today, down to 4db.
I'm 800 meters from the Cab(21.7dB attenuation) and have gone sync rate of @6db/46500 to 5db/48900 to 4db/52000.

To give you an idea of the gains.
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AngelRex

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Re: 3dB Target SNRm Live?
« Reply #206 on: April 03, 2017, 12:19:41 PM »

This is good to know cheers!

I am also 800m from my cabinet, although i'm only on a 40mb product.  My stats :

Broadband Link          Downstream    Upstream
Connection Speed   40000 kbps            7275 kbps
Line Attenuation                22.6 dB            0.0 dB
Noise Margin                  7.5 dB    5.5 dB

My upstream snr has always been between 5.5 & 6db
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j0hn

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Re: 3dB Target SNRm Live?
« Reply #207 on: April 03, 2017, 01:46:16 PM »

This is good to know cheers!

I am also 800m from my cabinet, although i'm only on a 40mb product.  My stats :

Broadband Link          Downstream    Upstream
Connection Speed   40000 kbps            7275 kbps
Line Attenuation                22.6 dB            0.0 dB
Noise Margin                  7.5 dB    5.5 dB

My upstream snr has always been between 5.5 & 6db
This won't have any bearing on your line as you already sync at the maximum for your package. The SNRM can't drop below 6dB unless you upgraded package.
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NewtronStar

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Re: 3dB Target SNRm Live?
« Reply #208 on: April 03, 2017, 06:29:18 PM »

Surly AnglleRex line could go from 6dB to 3dB in steps of 1dB the only difference the extra connection speed (sync rate) speed would be added to their attainable sync and if they changed the package to say BT 55/10 they could then use that extra sync, hard to tell without knowing AR's attainable rate.
« Last Edit: April 03, 2017, 06:35:09 PM by NewtronStar »
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andyfitter

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Re: 3dB Target SNRm Live?
« Reply #209 on: April 03, 2017, 06:45:58 PM »

Surly AnglleRex line could go from 6dB to 3dB in steps of 1dB the only difference the extra connection speed (sync rate) speed would be added to their attainable sync and if they changed the package to say BT 55/10 they could then use that extra sync, hard to tell without knowing AR's attainable rate.

It technically could do that, but whilst they are capped at 40, would DLM bother to reduce the SNRM if it wouldnt actually make any difference to the sync speed? I guess we'll find out when it is rolled out my widely. Would lowering the SNRM to 3dB and thus increasing attainable, but capping at 40, make the line more prone to noise and errors? I'd assume so.
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