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Originally Posted by steven_azari
1st of all the 8mb connections will need to go through fibre optic cable, which bt are going to invest in laying down across the UK.
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Wrong. ADSL is capable of approx 8meg down, 768k up, to around 2km line length (depends on quality). And if you've looked at the 21CN information, you'd realise that they were replacing the CORE network, and only trialling fibre delivery. For information, ADSL was trialled as far back as 1997, possibly even further. Look how long that took to reach the market.
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Originally Posted by steven_azari
Think about how long its taken NTL to install their network - thats how long it will take BT.
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8mbps ADSL is available via LLU NOW.
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Originally Posted by steven_azari
For those that know, ADSL cant sustain a clear channel over a telephone line as the signal cant hold through the wiring.
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As above, it can do 8mbps out to 2km. Line loss and noise are a factor, but are just as much of a factor in coaxial or wireless networks. Other forms of DSL can already do over 50mbps out to this distance.
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Originally Posted by steven_azari
2nd of all, NTL can match that speed, but dont need to just yet and cant as its not competitive business for other companies.
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NTL would have trouble matching it as the network stands. DOCSIS doesn't handle contention very well, especially not on the upstream path. Its technically possible, but would not be very robust without Layer 4-7 QoS and throttling.
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Originally Posted by steven_azari
3rd BB through power lines should be coming out 2005 giving SDSL capabilities and speeds of around 2 meg down and up for around 24.99.
4th of all, we still dont know what UPLOAD speeds will be in use. This is an important factor for gamers (which is one of the most important type customers out there). Both NTL and BT have a big problem when the power companies come, as well as all the ISP's out there that deal with their customers.
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Total b0110cks. Powerline suffers worse noise issues than BT's twisted pair copper. You have to be within 500metres of your substation to get those speeds. Powerline signals CANNOT pass a transformer, it is physically impossible. You have to provide fibre to the substation, at massive cost. Even more cost where the transformer is on a pole outside your house (not too uncommon, even just a few miles outside of cities).
Don't forget - the current powerline systems actually use SDSL deployed over copper leased lines provided by BT!!
Oh, and its a shared loop like NTL's system. NTL can resegment to remove problem contention though... I'd like to see resegmentation of the power network... massive engineering works, and prolonged power outages... no thanks...
Oh, and don't get me started on interference.
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Originally Posted by steven_azari
My brother works for BT retail (the company that provides ADSL capabilities to ISP's such as AOL) and says they are all very concerned about power companies because at the moment, UK technology evolves around ADSL and cable internet. and setting up an SDSL server would cost the company more than they would make from it.
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Cut the cr@p will you. BT Retail only sell BT Broadband, and now BT Yahoo. BT Wholesale provide services to other ISPs.
"SDSL Server" ??? Do you mean a service? Servers don't provide connections - they provide content (or network services such as DNS). Most DSLAMs that have been installed in the last year are capable of delivering SDSL and VDSL with minimal configuration change. Just BT's copper can't cope with it.
You might want to read today's OFCOM report - it makes interesting reading.
Perhaps you might want to go and familiarise yourself with some radio frequency knowledge (RF) before you go spurting off here again. Hint, look up modulation, especially QAM, and QPSK.