CATx

CATx is a shorthand used in information technology and networking to refer to copper twisted-pair cabling standards that use the Category (CAT) naming scheme developed for Ethernet and related networks. The term is generic and not itself a formal standard; it denotes any of the category cables, such as CAT5, CAT5e, CAT6, CAT6a, CAT7, and CAT8, standardized by national and international bodies (for example ANSI/TIA-568 and ISO/IEC 11801). In practice, CATx cables carry data over short to moderate distances in local-area networks and are typically terminated with RJ-45 connectors. They are designed for structured cabling systems that support a range of network speeds and protocols.

Copper CATx cables are built as twisted pairs, with variations including unshielded (UTP) and shielded (STP) constructions. Higher-category cables generally operate at higher frequencies and support higher data rates, and they usually offer improved crosstalk and attenuation performance relative to lower categories. The commonly used maximum length for Ethernet over copper CATx cables is 100 meters between the network switch or patch panel and the end device, though actual performance depends on installation quality and channel design.

CATx cabling is widely employed in enterprise networks, data centers, and building infrastructure due to its balance of cost, ease of installation, and compatibility with existing Ethernet standards. The term continues to be used as a generic reference to category-rated copper cabling as new categories and specifications are introduced.