Tried to get an answer googling this, without success. Just wondering how fibre speed is limited, e.g. My speed is 150 but I could move to 300 up to 900. Are there several cables and some not used? Or if it's one cable then how is it done?
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An optical fibre cable is capable of extremely high speeds, the service it carries is just fixed in software at whatever speed you are paying for.
I believe the current highest speed carried by a single fibre is 1Pbps! Not in a domestic environment though 😃