The Am79C100 Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) is an integrated circuit that implements the medium attachment unit (MAU) functions for the twisted-pair medium, as specified by the supplement to the IEEE 802.3 standard (Type 10BASE-T). This device provides the necessary electrical and functional interface between the IEEE 802.3 standard attachment unit interface (AUI) and the twisted-pair cable. A network based on the 10BASE-T standard can use unshielded twisted-pair cables, providing an economical solution to networking by allowing the use of existing telephone wiring. The Am79C100 provides a minimal component count and a cost-effective solution to the design and implementation of 10BASE-T standard networks.