Before we were using ADSL connection in our building but now the service provider has fixed fibre optic connection in our telecommunication room. They placed a switch terminating fibre optic cables. They have asked us to run a cat6 cable from this switch to your router.
We have Cisco 857 router with 1 ADSL port and 4 LAN ports
Now how do I connect this make fibre connection to router and what configuration has to be changed.
I would highly appreciate any help.