We have a site that is connected through fiber to the main office, we would like to create a backup link for a group of user (on a specific switch) to be able to connect to the main office through a T1 line if the fiber was accidentally damaged. What equipments do I need to finalize the connection on switches of both sides. Is it only CSU/DSU on both ends or do I need to have routers? if so what kind do you recommend?
Thanks for your help.