>"Cable systems have a design lifespan. This is usually around 25 years."
Literally the last sentence of my post is "Newer systems have a lifespan of around 25 years." What is your point?
>"The cables themselves have a lifespan, but it's far longer than 25 years."
No this is incorrect. There are a many factors that limit the lifetime of "wet plant" - chief among them are fiber hydrogen exposure, which causes attenuation. There is also glue and insulation aging as well as corrosion. And "the cable" in submarines systems always includes all of the passive optical components, alignments, joints and passive electronic components. Extending these system is generally on the order of 5 years. That could hardly be classified as "far longer than 25 years."
Literally the last sentence of my post is "Newer systems have a lifespan of around 25 years." What is your point?
>"The cables themselves have a lifespan, but it's far longer than 25 years."
No this is incorrect. There are a many factors that limit the lifetime of "wet plant" - chief among them are fiber hydrogen exposure, which causes attenuation. There is also glue and insulation aging as well as corrosion. And "the cable" in submarines systems always includes all of the passive optical components, alignments, joints and passive electronic components. Extending these system is generally on the order of 5 years. That could hardly be classified as "far longer than 25 years."