Just as an aside on the "nitty-gritty stuff"...
In general, the proper E-side cables from exchange to PCP can have 500, 1,000 or more pairs, and are pressurised as a means of keeping water out, and identifying potential failures. They've been in place for decades - some of them are insulated with paper... and you wouldn't want that to get wet at all! The storm surge from Hurricane Sandy catastrophically took out all the underground copper cables in a New York exchange, such that they had to upgrade to fibre.
Take a look at this primer and at this discussion. Pictures of the cable vault in that New York exchange can be found here.
I don't know what happens with EO-lines, but the discussion linked above indicates that these lines can still be pressurised up to the point that the first distribution (D-side) lines connect. Are they treated much like proper E-side lines? Are they made of the same technology?
So, you can imagine that there are complications involved here, where the "E-side" of the EO lines have been in the ground for decades, have no slack to be re-routed and connected into a cabinet, could be made of paper, and expect to be pressurised to stay dry.
It isn't quite the same as popping into B+Q and buying some connector blocks.



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