I realised what you meant by discount, hence my question as to how the refund got to the ISP in question given the hundreds of possible ones the customer could choose.
You still haven't specified the required number of deposits - which by definition has to be below 289.
I hardly think 288 x £30 is significant within BT Openreach's hourly cashflow, never mind the period between deciding to schedule an FTTC cabinet and go-live of that cabinet with associated BT Wholesale backhaul.
Actually it isn't cashflow. It is additional working capital you are talking about. Cashflow is each individual receipt of £30 and each item of direct expenditure on that cabinet.
Indeed, can't see how BT, even if they wanted to, could take any form of deposit from a customer who may go to another ISP. Additionally if they took a deposit that locked you to Infinity then it wouldn't be long before others were complaining about that.
To address the original post, BT know how many lines are on each exchange (roughly) and know how many go to each cabinet. They can correlate this with current ADSL connections and see a very general indicator of "demand".
If you take a hypothetical cabinet with 200 lines on it and BT analyse the numbers and see 120 lines on that cabinet have ADSL they might deem that to be a promising candidate to upgrade. Similarly if they see other cabinets adjacent to that one with similar levels of broadband users they might see the area as "viable".
On the other hand if a cabinet only has 20 ADSL users on it due to demographics (perhaps it serves a few old peoples cul-de-sacs or the like) then they'll likely skip it enitrely.
There is a cost of the fibre, power, cabinet itself and the cost of man/woman power to install it all which likely amounts to a pretty tidy some considering it seems to take a few weeks to get a cabinet in place and set up along with more weeks in between where work seems to be stopped. It's just a guess on my part but it will probably take a few years worth of subscriptions before BT "pay off" the cost of the cabinets from user revenues.
At least BT have the advantage of owning a literal mountain of copper wire that is worth a fortune. Eventually when they get round to going to fibre only they can begin to start selling that off.
BT Infinity 8th July 2010
Connected to: P23 Kilmaine Road, Bangor, BT19 6DT (NIBA
600m (approx) to cabinet
25.5mbit down / 7.6mbit up
BT Broadband, roughly 4mbit sync
4KM line / 54dB atten / 9dB SNR / Netgear DG834GT
Edited by orly (Sat 22-Jan-11 20:56:31)