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The lifespan of optical modems is generally five to eight years. The biggest difference from routers is that they are the carrier's asset, and when they get older, you can call for free replacement. My mom's car had a light degradation climbed from -21 to -26 in the sixth year. After the technician finished fixing the wire, it was stuck at -24, and after replacing it, it returned to -19. How to tell if your cat is old and what to use in reporting bad news—this article explains everything in detail....