Just installed a 350' Fiber Optic cable for a client. Customers IT company came in to install the AT&T router and said the fiber optic cable is not working. IT company installed the router with a short patch panel cable at the junction block and said the router was working. We do not have sophisticated test equipment so we used a very bright flashlight and were able to see light in the fiber optic cable (Single Mode LC). Is it possible AT&T needs to boost the signal for this distance? Is there a cost effective way to test the cable without expensive test equipment? Cable was purchased pre-terminated and passed internal testing. We are new to the fiber optic side and install mostly ethernet cabling systems so please forgive our limited knowledge. We tried searching many forums but there is limited information that is more confusing than helpful.
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350' is a negligible distance for SMF. Most long-wave PHYs do 10 km easily.
A very simple way to test the run is to hook up two 1000BASE-LX ports to it, check if they link and transmit data without errors. You can also put a loopback on one side (LC simplex cable) and the other side's port should link with itself (don't connect the switch to the production network, obviously).
Using 1000BASE-BX10 ports on each side, you can even check each fiber in the pair separately. Additionally, with a loopback on the far end you can connect two ports on one side through the run and the loopback.
A root cause for a failed fiber might be stressing the cable during installation or mismatching the fiber type - you can't mix single-mode and multi-mode fiber, even with a mode-conditioning patch the attenuation penalty is severe.
With pre-terminated fibre there's little to repair short of installing a new run.