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Standard User WWWombat
(fountain of knowledge) Fri 28-Jun-13 22:49:32
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Re: Vectoring


[re: ggremlin] [link to this post]
 
In reply to a post by ggremlin:
I did see something suggesting they were also testing about interference from radio stations, and the arkley ones are very close to the 'Saffron Green' transmitter.

Right.

I think the perceived solution is to set the vectoring process to ignore the affected frequencies. But it should be a good test to see if that happens automatically, or needs to be done manually.

I also wonder if we have any subscribers in the area, so we can get some graphs from unlocked modems during the trial wink
Standard User ggremlin
(committed) Wed 03-Jul-13 13:21:18
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Re: Vectoring


[re: WWWombat] [link to this post]
 
I suspect the Hadley Wood cabinet was selected because it is beside the East Coast Main Line.
Standard User Chrysalis
(legend) Thu 04-Jul-13 01:25:15
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Re: Vectoring


[re: ggremlin] [link to this post]
 
In reply to a post by ggremlin:
I suspect the Hadley Wood cabinet was selected because it is beside the East Coast Main Line.


are BT hoping for miracles?

vectoring is for crosstalk noise not external smile

BT Infinity 2 Since Dec 2012


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Standard User WWWombat
(fountain of knowledge) Thu 04-Jul-13 01:32:53
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Re: Vectoring


[re: Chrysalis] [link to this post]
 
I would guess that they believe Vectoring works OK when the only noise around is crosstalk. What they probably want to see is how it performs when significant external noise is present too.

RF and electrical noise from electrified rail lines, radio transmitters and aircraft beacons/radar all sound like good test locations to me.
Standard User Chrysalis
(legend) Thu 04-Jul-13 01:42:37
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Re: Vectoring


[re: WWWombat] [link to this post]
 
yeah that would be a valid reason.

BT Infinity 2 Since Dec 2012
Standard User LeJimster
(fountain of knowledge) Thu 04-Jul-13 23:22:04
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Re: Vectoring


[re: Chrysalis] [link to this post]
 
External noise *IS* crosstalk noise. If it's affecting a line from a known stable baseline, vectoring will try to filter it out just like noisecancelling does on some mobile phones to block out road traffic noise etc.

________________________
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Edited by LeJimster (Thu 04-Jul-13 23:23:17)

Standard User WWWombat
(fountain of knowledge) Fri 05-Jul-13 08:27:28
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Re: Vectoring


[re: LeJimster] [link to this post]
 
By "external", I'd normally expect it to mean from a source outside the cable.

Crosstalk is very firmly just from within the cable - other subscribers to DSL. FTTC subscribers mainly, as the ADSL crosstalk (from the exchange) is considered "alien" and cannot be removed by vectoring. Luckily it is a small-ish portion of the spectrum (and smaller, the further the cabinet is from the exchange).
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