[UK-CONTEST] Broadband

[Dave Sergeant]

Infinity is certainly theory at the moment here in Bracknell. 
Originally scheduled for December 2010, it has been put back twice and 
is now December 2012 with no sign of any work being done anywhere in 
the town. I suspect they will just add another year on the date later 
in the year... If you search the web you will find a beautiful photo in 
the BT forums of a BT Infinity advert on a  hoarding right opposite 
Bracknell telephone exchange, the ultimate in irony...

Another significant factor is whether your phone line comes into the 
house via an overhead line or whether it is all underground. Here it is 
underground and normally I get a very stable 8Mb connection on O2 
ADSL2+. But it does have the occasional hiccup and on Friday it 
suddenly started disconnecting for no obvious reason eventually 
resynching at 3Mb.... Last night I decided to change the filter and it 
immediately synched at 8Mb again and has stayed there. I am sceptical 
it had anything to do with it, but I did have another identical filter 
a while back that went noisy on the phone side, proved by changing it 
though I could see no fault when I broke it open.

Yes, Top Band, even at my low powers, throws it out even on 5W with my 
longwire, and I occasionally have issues on 80m, but otherwise no 
problems.

73 Dave G3YMC

On 28 May 2012 at 19:52, Bernie McIntosh (GM4WZG) wrote:

> I've cured similar ADSL broadband problems by ensuring that all of the
> house telephone wiring is on the audio side of the filter and that the
> filter is located at the point of entry to the house. 
> 
> Infinity uses VDSL which does indeed use a greater spread of frequencies
> than ADSL.  I would expect it will be therefore more susceptible to 40
> and 30m RF. Maybe even to desensing from 20m RF.
> 
> But there are several pieces of good news -  the system works by
> negotiating lots of different frequency slots that it then uses in
> parallel to effect the communication. If you knock off all the high ones
> the rate will drop significantly, but in most cases you'll have
> sufficient unnaffected slots for some kind of broadband service to be
> usable. After your operating is over, the system should eventually
> re-negotiate and lay claim to its original frequency slots again.   ADSL
> works the same way but 160 and 80 can wipe it out more or less
> completely because there are fewer frequency slots in use.
> 
> 
> The normal layout for VDSL is to have it at the point of entry to the
> house to reduce the distance the signal has to travel over low quality
> wiring. This will afford a great deal of protection in the first place.
> 
> But its all theory at the moment - there seems to be few reports at the
> moment concerning VDSL and ham radio.  It will be very interesting to
> hear from any hams that use VDSL and know if they have problems or not.
> 
> 


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