Usually, you'll find that if you have no connection at all, it is because of a broken cable. If you think you know which cable is bad, there is a quick and easy test you can do yourself with a laser pointer or bright flashlight. When issues like signal loss, slow speeds, or intermittent connectivity arise, systematic troubleshooting is key. This guide will walk you through diagnosing and resolving common. One of the most common problems in fiber optic networks is the misalignment of the transmit (TX) and receive (RX) pairs. With their ability to transmit data at speeds up to 1.