Cat8

Cat8, short for Category 8, is an Ethernet copper cabling standard designed for high-speed data center networks. It specifies support for 25GBASE-T and 40GBASE-T Ethernet over copper cables for short distances, up to 30 meters, with a maximum frequency of 2,000 MHz. The standard targets modern data centers requiring fast server-to-switch or switch-to-switch links, and is not intended for general consumer use over longer runs.

Construction and performance characteristics are designed to minimize interference. Cat8 cables are typically shielded, employing shielded twisted pairs (S/FTP or F/FTP) and an overall shield around the cable to reduce crosstalk and external noise. Conductors are usually solid copper, with gauges often in the 22–28 AWG range, and jackets rated for the installation environment. Many Cat8 patch cables use RJ45 connectors that are rated to Cat8 performance, but meeting the standard requires that the entire link, including connectors, is properly rated.

Standards and usage context place Cat8 as a data-center option rather than a general networking upgrade. It is defined within international and national standards, such as ISO/IEC 11801 and related ANSI/TIA specifications, and some markets distinguish subcategories or classes (for example Cat8.1 and Cat8.2) to reflect connector and shielding variations. Because of its higher frequency and shielding requirements, Cat8 cables tend to be more expensive and less flexible than earlier categories, and installation typically involves attention to bend radii, grounding, and overall link integrity.

Limitations include shorter maximum link lengths and potential compatibility considerations with legacy equipment. Cat8 is most appropriate for short, high-bandwidth connections in data centers, rather than widespread deployment in home networks.