Sounds strange but it is like that for me. Given Fritzbox 7590, Netgear switch and PCs or laptops. Everything is wired with Cat6a and when I test I get 1GBit throughput (depends on the network card in the computer which can no longer). Now the question I replace, for example, a cable (no matter where - Fritze after switch or only on the PC in the network socket, …) with a Cat8 then the network is reduced to 100MBit for me? I have no explanation for why? Actually, Cat8 would even have to pack 10 GBit loosely / and yes I didn't just try a Cat8 cable. Even measured, everyone was ok…
Category 8 (Cat 8):
Cables according to Category 8 / Link Class G wude standardized for data centers. This TP cable corresponds to those of categories 6a and 7a. It has the same diameter, four STP wire pairs, a bandwidth of 2 GHz and uses RJ45 connectors. This cable is to be used in 40 Gigabit Ethernet via twisted pair cables. With these specifications, distances of up to 30 m can be bridged. Category 8.2 cabling is not compatible with the RJ45 connector.
In addition to Category 8 specified by the EIA / TIA, there are also Category 8.1 and Category 8.2. The cables and components of category 8.1 are foil-shielded F / UTP cables. Kat 8.1 components essentially correspond to the Kat 6A components, but their frequency response has been optimized up to 2 GHz.
Source: IT knowledge for practice
