The way blown fibre works is that you install what is essentially plumbing, a multicore pipe. The pipe may have from a few to many tubes in it, each one is a few tenths of an inch inside diameter.
These multicore pipes form the fibre "trunks".
Then, back to plumbing, a route for fibre is made up from joining tubes from one trunk to another, using tube joiners
Then you get a big box of fibre, and an air compressor, and literally blow the fibre down the tube from one end to the other, and the length can be up to about 20km. Stick terminating fibres on the end to a connector and thats a fibre run done. I'll gloss over terminating, joining, and testing as mere details, but its really important its done right.
The fibre blown is actually several individual fibre strands, a 12 core fibre would be less than 1mm diameter.
Labelling is usually done at three levels; firstly the overall pipe is labelled, and then each tube, like this:
Then the individual fibres are then generally presented on a panel as sockets, each being numbered.
The fibres are often spliced, either in an exchange, a street cabinet or in a manhole so that different fibres in a tube take different routes to different places.
