The fiber optic splice has a poor signal
Even small splice mistakes like dirt or misalignment can cause major signal loss. Seasonal weather changes (freeze–thaw cycles, humidity shifts) affect splice durability. Reliable diagnostics using tools like OTDR help catch issues before they escalate. A high loss on a fusion splice can mean that the fusion of the two fibers may not have properly occurred and you have a weak slice that could fail pre-maturely.
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