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Originally Posted by DrAwesome
At a guess some BT exchanges although adsl upgraded can only handle a certain adsl speed (someone will nodoubt correct me if this is incorrect).
Trouble with Bulldog is that your limited to 512k during non peak time wouldnt be so bad if on the 2meg package you were limited to 1meg during peak times during the day and i think someone has already pointed out that you are tied to a 12 month contract (if you look hard enough you can find a 3month and lower contracts) so if you find the service not to your liking then you have a long wait till you can jump ship..
I guess Bulldog must have a special arrangement with BT as no other adsl isp offer the same service packages.
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Bulldog offer the package you describe above, PrimeTime 2000, and an AllTime 2000 product, from over 400 enabled exchanges. From 70 or so in Central London they offer services for the home up to 6Mbit/s downstream and 400kbit/s upstream.
A number of ADSL ISPs offer similar 2Mbit services from a number of enabled exchanges using an alternative form of ADSL provisioning called 'DataStream' or Option 3 in BT speak, have a google :p
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Originally Posted by gt94sss2
hehe - consider yourself corrected
All BT ADSL exchanges can cope with the same speeds (as they all have the same equipment fitted) - it just that Bulldog use a different method of backhaul from some of the exchanges to its core network which allows to offer services like its Primetime "time of day" offering at those exchanges
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LOL no sir, consider
yourself corrected
Not all BT exchanges are equipped equally, they have varying backhaul depending on demand and other factors. Typical backhaul is 4 - 8Mbit for 512k 50:1 users and 10Mbit for 20:1 business users, not sure what is provisioned for 1Mbit users, think they go on the same paths as 512k.
This only applies to IPStream not DataStream, which uses a dedicated ATM link from each exchange onto Bulldog's ATM network, rather than having the data go to BT's LAC (L2TP Access Concentrator) along with the other IPStream ISPs on an exchange and get seperated there to be fed to the individual ISPs.
Bulldog's DataStream links typically vary between 2Mbit and at most 10Mbit, which in some cases works rather poorly, when there are 2 or 3 2Mbit users on an exchange intent on anhialating the 2Mbit VP (Virtual Pipe/Path) and said path only delivers 1.8Mbit of actual usable data speeds get a bit hairy.
That is how Bulldog delivers their alternative services on 450 or so exchanges in the UK.
In the 70 or so (I think) in Central London they actually use all their own kit. People's copper phone lines come in and go to Bulldog's own DSLAM (Digital Subscriber Line Access Multiplexer) - the bit that combines all the incoming ADSL 'calls' into ATM for backhaul, and from their goes down Bulldog's Metronet. As Bulldog have complete control of this apart from the copper itself and the line card at BT they can offer whatever they want on it, DataStream and IPStream are limited by BT to 2048k/256k maximum. Usually LLU (Local Loop Unbundled or BT speak DSL Option 2) exchanges are on 100Mbit LAN Extension lines
And that's it in a nutshell, albeit a large one, hope that helps *phew*
Without having to google once
*flex*