On 13/01/2011 12:08, Peter Collins wrote:
I wonder if people realise what advertised Fibre really is a lot of
the time. correct me if I'm wrong but as I understand it, a good
percentage of the time the Fibre is only from the cabinet in the street:
Virgin's service is fibre based to cabinets, as long as you are a
cable customer, they use DOCSIS for both Broadband and TV services
which is a copper cable from home to the cabinet and then a fibre
"backbone".
If you all not a cable customer then you will on Virgins LLU package.
The 40Mb BT infinity is based on a similar solution although not
DOCSIS, however it is still a "copper" cable going from home to
cabinet - fibre-to-the-cabinet (FFTC).
However around 25% of BT's network will be able to get 100MB
connection which is fibre-to-the-home (FTTH).
I remember reading somewhere that BT will offer a minimum download
speed 15Mb on the 40Mb package, whereas Virgin's customers got an
average of around 47.5Mb when on the 50Mb package.
You are correct that the BT roll out is FTTC. But I think BT are being
sensible with the offer of a minimum of 15meg, far better than telling
everyone they get 40meg and most people not getting it.
Because it's FTTC you get a fast speed to the cab then VDSL2 from the
cab to your house. The speeds for VDSL2+ profile that BT uses are here,
apparently they use "8c":
http://www.buckconsult.co.uk/fttx/BT8cProfilesVDSL2.jpg
From that you can see you need to a fair distance from the cab to drop
to 15meg, but it is possible with some long lines. I think being
conservative with the speed claims makes a nice change from my "up to
24meg" broadband that I have which in reality is only 2meg due to my
line length!
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