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149 posts

Master Geek
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# 138910 21-Jan-2014 15:10
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I'm wanting to find out what my line attenuation is with a view to switching from adsl to vdsl.

My Netcomm modem router  tell me this:













Line Coding(Trellis):








SNR Margin (0.1 dB):








Attenuation (0.1 dB):








Output Power (0.1 dBm):








Attainable Rate (Kbps):









So does that mean the attenuation is 2.25 ?

If so, then this site tells me the closest cabinet is less than a km away (I think this is what it meas by 'approx distance'?) and would be good for vdsl. But I once asked a Chorus guy (in our street) to get his line maps out and trace ours - he said we were well over 1km away.

I'm with SShot and I'm able to get vdsl with them [according to their site checker]; so dunno?

Anyway - another qu.

Sshot are to provide me with a modem vb104W. I'm thinking that if my install goes well and all is good, then I might change that modem/router for a 'better' one. BUT, if all is good, should I bother?

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3344 posts

Uber Geek
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  # 971710 21-Jan-2014 15:20
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Attenuation (0.1 dB): 225 103 = 22.5 (down) 10.3 (up)

But the max attainable speed doesn't really match up with that it seems :/ what actual sync speed do you have?

3205 posts

Uber Geek
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  # 971712 21-Jan-2014 15:25
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..And evaluation/approval will also rely on some behind the scenes data from chorus with the actual local box jumpering and known run lenghts :)


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Uber Geek
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  # 971713 21-Jan-2014 15:26
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TBH, while ADSL modem stats might give you some indication of what you *might* get on VDSL, they're not really going to be that reliable for a number of reasons. Do you even have a master filter currently, etc?

IMO... if a pre-qual says you can get VDSL you should go for it.

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Uber Geek
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  # 971722 21-Jan-2014 15:53
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A rule of thumb is that if the downstream attenuation is more than 10.8db (22.5dB in your case), then the line is too long for VDSL. It is not exact however.

Stick your address in here, and see what it says - broadband greater than 20Mb/s means VDSL.

Bear in mind the various maps that plot cabinet locations do not tell you which cabinet you are connected to, and do not tell you the cable route, which sometimes goes down every side street before getting to you - basically, the cable is often far longer than the straight line distance to the cabinet. 22.5dB is most likely a good amount over 1km and consistent with what the Chorus tech told you.

Having said all that, if the Chorus maps tool says your in the area, get a pre-qual done and go for it.

149 posts

Master Geek
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  # 971946 21-Jan-2014 21:45
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Not good.

The map shows our street at 10Mb and we are SURROUNDED by 20Mb. Grrr

"............which sometimes goes down every side street before getting to you ........"

THAT IS exactly what the Chorus guy said.

So, I'm well peed off since I have Sshot, Snap and Orcon saying I'm good for vdsl (according to their websites) and yet I'm not.

It's a bloody lottery.
" get a pre-qual done "

HOW do I get this plz?

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Uber Geek
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  # 971967 21-Jan-2014 22:03
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" get a pre-qual done "

HOW do I get this plz?

Ring (or otherwise contact) your RSP of choice.

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