25GBit using CAT7A cable
25GBit using CAT7A cable
Online sources claim Cat7/7a handles 1000MHz and 10Gbps, but no mention of 25Gbps
25Gbit is only mentioned for CAT8 at 2000MHz speeds, meaning it might be a case-by-case scenario. It could potentially function over short unknown distances, but that's uncertain.
Most devices that follow Cat7a and Cat 8 guidelines are limited in what they can achieve. Cat7a isn’t accepted by TIA, whereas Cat8 is recognized but mainly suited for short-distance datacenter links where fiber remains preferable. The majority of Cat8 equipment relies on RJ45/8P8C connectors, which don’t match the requirements of Cat7a or Cat 8. Cat7a typically uses TERA or GG45 connectors, though these are uncommon. Cat8 can technically work with Cat7a using TERA or GG45, but this would mean running Cat7a itself, which supports up to 25Gbit. Using Cat7a with 8P8C connectors would violate the standard, so it won’t function as intended. Full Cat8 systems are restricted to cable lengths of around 30 or 36 meters depending on the specific cable type.
Start with locating devices that support RJ45 ports and can handle 25Gbps over them, or look for 25Gbps copper SFP28 modules. The market currently doesn't offer these options.
For long-term solutions, fibre is the best choice. Although copper can technically support those speeds, it won’t become widely available until fibre is more practical. Even today, using 10Gbit with copper costs significantly more than with fibre.