[UK-CONTEST] BT Infinity

[David G3YYD]

Dave

Very helpful information, thank you.

Virgin or should I say NTL cabled this street years ago with fibre. If I 
(for that read XYL) want to go faster than 2MB/sec., I will go for 
Virgin seems to be more EMC friendly to an HF contester. If any of my 
neighbours start using BT Infinity then I may have some EMC issues. I 
know with current slow broadband that a number of them go to a lower 
speed but no one has actually complained to me. I think my attitude will 
be nothing to do with me - it is a BT problem. I just hope Infinity can 
adapt around my transmission but if my signal overloads the modem front 
end....

Upgrading the exchange is cheap compared to putting the fibre to a 
replaced street cabinet with electronics. No wonder BT say Infinity is 
available on the exchange but no mention of the street availability.

73 David

On 16/08/2011 13:00, Dave Sergeant wrote:
> On 16 Aug 2011 at 11:22, David G3YYD wrote:
>
>> Does anyone have experience of the EMC compatibility of this product
>> with high power contesting? Both good and bad.
>>
>> With the normal BT Broadband I had to design, make and install a 1MHz
>> cut off LPF on the line going to the router. Without it on the low bands
>> the modem retrained to a very low download speed.
>>
>> BT Infinity still uses tones on the normal phone pair coming into the
>> house but from a roadside cabinet which is fibre fed. To get its higher
>> (40MB/S) speed I presume the bandwidth on the line must go higher than
>> 1MHz. Hence the question asked.
> BT Infinity (and similar fibre products marketted by a FEW other ISPs)
> uses fibre to your nearest cabinet, then over normal twisted pair to
> your house as VDSL - this uses up to 12MHz. I have no information as to
> its EMC characteristics, but imagine radiated noise will be more
> noticeable than ADSL/ADSL2+ (up to 2MHz). Most problems with broadband
> disconnecting from amateur transmissions are due to it getting into the
> router, these will be no different with Infinity, but since your
> broadband signal is likely to be stronger depending on the distance of
> your cabinet then I would think it would be more immune.
>
> Have you checked that you can actually get Infinity? Our exchange in
> Bracknell has slipped a year and won't be upgraded till the end of this
> year. And having your exchange upgraded does not mean you can get it,
> as BT have been very slow in installing the actual fibre and putting in
> cabinets.
>
>> Also anyone had problems with Vigin Media "fibre" broadband?
> Virgin cable puts the broadband on UHF channels along with the TV
> service, so is totally immune to the sort of problems ADSL suffers.
> Note that the 'fibre' part goes to a major distribution hub in the
> vicinity, it is then distributed to other cabinets and eventually your
> house over normal coax. The fibre bit may some distance away. Obviously
> an option if your street is cabled, but of course you are then
> restricting yourself just to Virgin broadband.
>
> 73 Dave G3YMC
>
>
>
> http://www.davesergeant.com
>
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