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Originally Posted by Chrysalis
correction to erol and kits post's , although erol made a outstanding post.
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actually I had already (with help from sunil) created a more complete / accurate version of that post which can be found here.
http://www.cableforum.co.uk/board/sh...131#post196131
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Originally Posted by Chrysalis
The BT Ipstream product has a 20:1 2048/256 package as well, although it isn't cheap but it is uncapped and reliable. The datastream variant is cheaper but speeds are very incosistent due to the high contention and low user volume.
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Esseniatly all the IP (and datastream for that matter) products are uncapped. It is upto the ISP to decide to cap usage or not. The real difference to an end user of an IPStream based solution vs a DataStream based one is that with IPStream they know explicitly what the maximum contention between their local exchange and their ISP is (either 20:1 or 50:1 depending on the product used by the ISP). With datastream they do not know what the maximum contention is in that section. It may be better or it may be worse.
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Originally Posted by Chrysalis
Anyone here thinking of moving over to ADSL needs to know the dangers of datastream, almost all the low priced 1mbit and 2mbit prices on ADSL use datastream, so research before you order if LLU or IPStream performance should be fine.
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What is true of datastream (that you do not know what the contetion ratio is between local exchange and ISP) is also true of LLU. It is only with IPStream based products that you know what the maximum contention ratio is between local exchange and ISP is. DataStream (or LLU) based products are not inherently better or worse that IPStream products, its just you have a bit more knowledge with IPStream re contention. Having said that there are (generally selling business based services) ISPs that offer datastream based products where they do guarantee a contention ratio (I have seen as low as 5:1) from local exchange to ISP, but they obviously cost more than those with higher or unkown contention is this section.