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andynz

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#127313 6-Aug-2013 09:25
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Hi guys

I have gone through the initiall process of getting VDSL to our office.  Via 3 suppliers of VDSL a preqal said the service would be marginal.  I sort of expected that but that was based on clothed service over existing Telecom line.  The VDSL would be naked over new line.  These are the details:

1) Existing copper pair, currently with ADSL, 1.7km from the roadside Dslam.  Existing ADSL download 13Mbs with Xnet. Torturous route for the cable over neighbours field.

2) Proposed new service - Naked VDSL.  1.3km from roadside Dslam.  Current 16 pair cable under driveway from office to roadside junction upstand. Not connected at this time.  5 less joins in the cable.

So the question is how does Chorus come back with a tested attenuation of (I think it was 15db, it was 2 more than worst allowed anyway) when the cable is not physically connected yet.  Apparently a technician came round and tested it be we have seen no one here and we live on site.

Isn't VDSL chicken or egg.  How do you know the attenuation when the copper pair are not even connected?

Cheers
Andy

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sbiddle
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  #875995 12-Aug-2013 16:54
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The issue is more Chorus sticking to their 10.8dB maximum attenuation. This is not possible at that distance.

There are people out there who have connections that exceed this limit as installs have happened for a variety of reasons. Most of whom have connections they may feel are OK, but the impact they can have on the network in terms of crosstalk are catastrophic to other xDSL users and for this reason they should never have been provisioned.

VDSL gets around this with UPBO, but it can't fully eliminate the issues of FEXT and NEXT. Users with poor signal quality basically end up impacting users close to the ISAM.





coffeebaron
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  #876016 12-Aug-2013 17:54
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Get ADSL provisioned on the new line, then try a churn to VDSL and see how you go.




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