Fibre speeds

[tmarsh12345]

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?

[pippincp]

There's a cap placed on yourline restricting speed to whatever you are contracted at.

[licquorice · Accepted solution]

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. 

[tmarsh12345]

Thanks, that's what I wanted to know. Just curious!

[licquorice]

I believe the current highest speed carried by a single fibre is 1Pbps! Not in a domestic environment though 😃