O Canada! > Canadian > TekSavvy > [DSL] predicting vdsl speed from adsl line stats

[DSL] predicting vdsl speed from adsl line stats

It would probably help if you'd post your line stats.

reply to bjlockie
Impossible. The technologies are different, the loop length is potentially different (may not be on the same remote). There's no correlation whatsoever. You could have a terrible quality adsl1 line that can't hold a 5 meg sync, but be able to get 50/10 on VDSL2, or you could have a great ADSL1 line with fantastic stats but be unable to get 25/10 because you're just a little bit too far from the DSLAM.

Example: my attenuation on ADSL1 was 35, my attenuation on VDSL2 is 6. So any prediction of my VDSL2 speeds using my former attenuation would have been pointless.
--
Developer: Tomato/MLPPP, Linux/MLPPP, etc »fixppp.org

reply to squircle
Current Noise Margin: 18.7 dB (Downstream) 9.7 dB (Upstream)
Current Attenuation: 11.7 dB (Downstream) 6.4 dB (Upstream)
Current Output Power: 12.0 dBm (Downstream) 11.8 dBm (Upstream)
DSLAM Vendor Information: Country: {0xB5} Vendor: {BDCM} Specific: {0x94A1}

Your upstream attenuation puts you around 600-800 Meters From your Slam if its an Oslam Your upload will suffer greatly if its a 7330 you could get 25/10 easily might be close on 50/10 depending on actual distance
--
Every time Someone leaves Sympatico an Angel gets its wings.

Hi guys,

I was actually going to ask the same question. As I don't really understand the DSL stats, could someone provide me with some ballpark numbers on my line stats? I'm thinking of getting 25/10 mbps in the near future and wondering if I'll be able to get the full speed.

Bandwidth (Up/Down) [kbps/kbps]: 797 / 19.453
Output Power (Up/Down) [dBm]: 11,5 / 14,0
Line Attenuation (Up/Down) [dB]: 9,5 / 16,0
SN Margin (Up/Down) [dB]: 18,5 / 12,5

Thanks
Rocky

Your stats are great. You should ask for the full upload speed.

Good to here. Thanks for your help!

Xtrocky I would disagree your stats indicate a distance of 1 km or more, Upload speed will be iffy depending on the type of slam your Connected to, Though of course they could move u closer. Oslam you will not get service unless lucky, 7330 should hold solid but be close to caps.
--
Every time Someone leaves Sympatico an Angel gets its wings.

reply to bjlockie
In the near future, I am planning to switch to teksavvy's 25/10 or 15/1. With my current DSL stats, I wonder if I can get 25/10 full speed. If not then maybe I should consider cable.

Downstream Upstream
SNR Margin (dB): 22.6 6.0
Attenuation (dB): 23.0 6.5
Output Power (dBm): 19.7 12.6
Attainable Rate (Kbps): 10816 1088

Thanks.

reply to bjlockie
I would agree mostly with InvalidError but Guspaz has some points.

Guspaz could be correct if you would end up changing DSLAMs, however if the new DSLAM is right beside the old DSLAM then the numbers could be a bit relevant.

Assuming you stay on the same port or close by, InvalidError has a decent write up, however ADSL attenuation is based on lower frequencies, and actually only a small slice of them, and is known to be erratic. If you have a noise spike in the freqs that are used for attenuation calculations but remaining freqs are mostly clean then attenuation would be overstated. The reverse could be true if you have lots of noise but not in the freqs used for attenuation calculations.

When you boil it down you could do nothing more than guesstimate, it would be unreliable.

For a Guesstimation Upload attenuation is generally this simple 6.5 would suggest your 650 meters ballpark 5 would be 500 meters etc.. 10 is 1 Kilometer etc.. So you get the idea its a Estimation and is not ideal but assuming your Within Possible distance your likely already on The remote nearest you, IE Oslam or 7330 and all u can do is hope.
--
Every time Someone leaves Sympatico an Angel gets its wings.

reply to STN

But he's asking as a end user. Can you try and do some more detailed analysis, yes you can try. But his question wasnt from a tech looking at DMT graphs. I'm giving him some general comments on end users trying to "predict my vdsl speed from my current adsl line stats"

I forgot how one-upity these forums are.

reply to bjlockie
Having perfect adsl stats doesn't guarantee perfect vdsl2 stats. Bridge Taps/End taps and gauge changes effect vdsl2 much more. As well as the PSD noise and wideband frequencies effecting your pair. ADSL handles the above much better and generally around 3km is around where Max attainable (8128/800) goes downhill.

There are lots of additional factors and you can't go by distance alone. Had a customer at 980 meters with attainables of 56 down and 18 up and it was even on encap with a 7330. Also had customers with less distance and lower attainables.

Well Slam Tech 7330s are pretty good at pushing i;ve installed a fibe tv @ 1350 before, sucessfully But we both know put that distance on a Oslam and kiss your sync goodbye p:)
--
Every time Someone leaves Sympatico an Angel gets its wings.

reply to STN

Up Attenuation is a Indicator heh beyond that oh well. Starcraft hots time p:) why for is noone excited?
--
Every time Someone leaves Sympatico an Angel gets its wings.