For Centrals? The ISP pays a set charge per year, plus an installation charge. From what I recall, a 622Mbit central costs over 1.5 million per year to rent. Not including overheads, it only takes 77 maxing downloaders to fill a central. Or are they 622MByte, i forget, in which case it'd take 622 maxing downloaders to fill a central.
Other charges to the ISP are nothing in comparison. Central charges are artificially inflated by BT to make it more expensive than it'd cost for LLU. Anyway, once the ISP has enough bandwidth to handle its peak use, 6-11PM or whatever, there will be lots of unused central capacity just sitting there at night. It costs the ISP the same whether the centrals are empty or full, it makes no difference. Problem is, advertising large offpeak usage guidelines usually attracts the heavies...
EDIT
Ah found it, a single 622Mbps (Megabit!) central costs
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Edited by LadFromWales85 (Fri 03-Nov-06 22:11:58)