Already have an optical connection between me and my ISP (about 2 KM distance) and a speed of 2 Gbit/s. Sounds pretty sweet at first but those cards or switches require a lot more power than casual Gbit cards and are also running quite hot. And of course all that speed and low latency is useless if your PC is using copper and a like materials on the PCB. That's probably why they are only offering 50 Gbit/s. Recent studies at the Universities of Vienna and Graz have shown that it is possible, with current LWL cables, to reach speeds up to 3 times of that and more when using a different wavelength and more power on a distance of a few kilometers. Now imagine that on a short distance like an office where there is lower latency resulting in even higher speeds.
One other problem is the speed of current hard drives, none of them can match the speed of the cable, so it is a good solution for industrial size networks with lots and lots of drives but at home, even with a Raid 0 configuration, pretty much useless unless you are connecting different networks with each other.
(1Gbit/s copper = max 120MB/s, 50Gbit/s = 5.86TB/s)


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