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Originally Posted by Ramrod
Can someone explain to me how it costs ntl more to run a higher speed line? For example, is it costing ntl any more to run a 2 mb line as opposed to a 1mb line? 
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Each UBR card has a finite bandwidth available to share between the customers using it. A UBR card can only accomodate half as many customers using their 2Mb connection to the full as it can accomodate 1Mb customers without undue adverse affects on their connections. Therefore as speeds increase more UBR's have to be installed to prevent a deterioration in customers experiences.