CAT4

CAT4 or Category 4 is a description of network cabling that consists of four UTP wires with a data rate of 16Mbps and was used in token ring networks, 10BASE-T, 100BASE-T4, and is no longer common or used.

Also see: Cable, CAT1, CAT3, CAT5, CAT5e, CAT6, CAT7, Network definitions