Signal loss can occur in Fiber Optic Splice Closure (FOSC) due to various reasons such as dirty connectors, broken fibers, or loose connections. To troubleshoot this issue, you can try the following: Inspect the connectors for dirt or damage. Fiber splicing is unavoidable in real-world deployments. Cables must be joined due to route length limitations, branching requirements, repairs after damage, or network upgrades. A. Fiber optic joints or terminations - where cables are terminated - are made two ways: 1) connectors that mate two fibers to create a temporary joint and/or connect the fiber to a piece of network gear (left) or 2) splices which create a permanent joint between the two fibers (right). In this section, we will discuss these issues and how to troubleshoot them.