How to divide optical fibres between networks?

[Lux_]

There are sites A and B, the internet connection is available in site A.
There is a 12-fibre optical cable between sites A and B.
A computer network needs 2 fibres to operate.
There are 10 located firms in site B.

Question: how can every firm have its own secure connection to the internet? The throughput of fibre pair should be more than enough to provide each firm with 10MB connection, but which hardware is needed? Or every firm has to have separate pair?

Question 2: if in addition to computer network there are additional technological networks, can one pair be shared between comp. and tech. network?

 

[Albuquerque]

You don't need seperate physical wiring to have seperate logical networks across them, just like you don't need seperate memory chips and processor cores to run seperate logical processes on the same computer. Just like you don't need individual wires from your home to whatever servers you're trying to connect to over the internet.

What you are asking is a bit more involved than would likely be covered in this forum. However, you essentially would link the two sites together, and then simply build seperate VLAN's (virtual local area networks) on each side and link them together. Your twelve fibers should be enough for an easy six gigabits of full duplex bandwidth on "cheap" hardware; quite a bit more could be had depending on the hardware you use at each end.

You assign those VLAN's to the various companies at each site, and set up routing rules to allow / deny traffic crossing from one VLAN to another just in case you don't want them talking to eachother. You could also still have a single internet connection at either end of that fiber pipe that could feed all the VLAN's.

This is pretty simple network stuff in reality, sounds like you just need to take a few short classes at your local community college or business education center. One semester of "TCP 101" would probably get you well on your way

 

[Lux_]

Thank you for the answer!