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Standard User eckiedoo
(experienced) Sun 28-Sep-14 11:07:30
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BB v ADSL Attenuations


[link to this post]
 
Just been checking my present Broadband Attenuations versus my previous ADSL Attenuations.

ADSL (Before 5th June 2014)

1286 Metres Full Line Length, E+D, Exchange to House
250 Metres D side only, PCP to House

24.5 db, Downstream Average over previous 2 years.

11.5 db Upstream Average over previous 2 years.


Broadband VDSL (After 5th June 2014)

300 Metres FTTC via PCP to House

Instantaneous Attenuations this morning,
have been similar over the VDSL period, very slight fluctuations.

14.9 db Downstream

11.5 db Upstream

=====================

No problems, simply my curiosity.

Particularly wondering why the BB Upsteam does not show the proportionate reduction of the BB Downstream, realative to the original ADSL figures.

Again, I am not having problems, just wondering why there should be such a difference with the BB Upstream.
Standard User BatBoy
(legend) Sun 28-Sep-14 11:15:02
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Re: BB v ADSL Attenuations


[re: eckiedoo] [link to this post]
 
I think they are measured differently.


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Administrator MrSaffron
(staff) Sun 28-Sep-14 12:27:48
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Re: BB v ADSL Attenuations


[re: BatBoy] [link to this post]
 
More importantly rather than upstream being at low frequency which travels over distance better, the upstream is in 3 bands and the downstream in 3 bands on VDSL2, and these are interleaved.

So attenuation will more closely match that of the downstream, and you can get situations where one person has 30 Mbps download and 9 Mbps upload and someone else with 30 Mbps down and just 4 Mbps up because of the line length.

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.


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Standard User eckiedoo
(experienced) Sun 28-Sep-14 12:30:35
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Re: BB v ADSL Attenuations


[re: MrSaffron] [link to this post]
 
Thanks, Andrew.

With the Interleaving, makes sense technically.
Standard User BatBoy
(legend) Sun 28-Sep-14 13:08:15
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Re: BB v ADSL Attenuations


[re: eckiedoo] [link to this post]
 
The interleaving also means the total attenuation is calculated rather than measured, unlike ADSL.


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Standard User eckiedoo
(experienced) Sun 28-Sep-14 13:19:52
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Re: BB v ADSL Attenuations


[re: BatBoy] [link to this post]
 
Thanks, Batboy.

Interesting what is coming to light!
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