Cat 3 Cabling
Cat 3 cable is an unshielded twisted pair (UTP) cable designed to reliably carry data up to 10 Mbit/s. Category 3 was a popular cabling format among computer network administrators in the early 1990s, but fell out of popularity in favor of the very similar, but higher performing, Cat 5 standard. Now that Cat 5 is obsolete, most new structured cable installations are built with Cat 5e or Cat 6 cable. Cat 3 is currently still in use in two-line telephone systems, although Cat 5 or higher could do the same work and allow transition to VoIP.