I subcontract to a company when they need me. They have not needed any help for a year. Point being someone else has been doing work at an adjoining company, and for the last couple months part of this company has had no internet going to it. So they called me in to look.
the main switch is a linksys, it has 4 small ports on the right for fiber, the other ones around the company are cisco, they have 2 wide ports for fiber on right side. (forgive me, i'm not there if you need to I will copy down the part numbers).
One of the fibers was not lighting up on the linksys, I tracked it down to it's corresponding cisco. I checked out where the cable went. There is a panel with each outlying section labeled. The port for the section I was looking for was unplugged, and the fiber plugged into a different port. I' pretty sure the other company did it because they were in this cabinet. (don't ask me why).
The problem is this... I plugged the proper port into the proper cable, and it still does not light up. I traced the cable with a laser pointer and I get light coming out on both sides. I've switched the linksys ports around, and switched them back, and used other wires keeping track of what was where originally. The problem does not seem to be the metal insert that the fiber plugs into. I don't know about the cisco side because I have no spare plugs, but I'm trying to get some.
All is back the way it was currently. How come the switches won't connect? What sources can I go to, to understand more?