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It depends on the order they do things in, and whether problems get in the way.
Power used to be more of an issue - it used to be a couple of months after the cabinet (without problems) and maybe 6 months (with). In the last results, BT said they were improving those times.
The fibre itself could be either before or after the cabinet.
And, of course, the head-end of the fibre, the exchange, could be any time relative to individual cabinets.
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