What do you mean by the cabinet is operational? That some people on the same cabinet as you actually have a service?
Yes people on the same cabinet & same ISP. I started a thread about this a while back and the general conclusion is that it is due to distance.
I have as yet never got any sort of clear answer from an ISP or bt wholesale, they generaly say the distance should not be a problem. This situation where nobody seems to be able to access information from open reach makes planning very difficult.
my message for the OP is despite many phonecalls and email enquiries I have found no better information than the bt wholsale adsl checker. I have also recieved contradictory information, letters from BT saying FTTC is in our area, TALKTALK telling me it will be available in a few weeks time 5 months ago and it been available at our adress according to samknows.
For the OP it was BT open reach engineers who told me where the cabinet was physicaly located.