Category 4 is a description of a cable that consists of four unshielded twisted-pair (UTP) copper wires with a data rate of 16 Mbit/s and performance of up to 20 MHz.
It is used in telephone networks which can transmit voice and data up to 16 Mbit/s.
For a brief period it was used for some token ring, 10BASE-T, and 100BASE-T4 networks, but was quickly superseded by Category 5/5e cable. It is no longer common or used in new installations - and is not recognized by the current version of the TIA/EIA-568 data cabling standards.
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