The LAN8700/LAN8700I and LAN8187/LAN8187I are higly-integrated devices designed for 10*100Mbps Ethernet systems. they are based on IEEE 10BAZE-T and 100BAZE-TX standards. The IEEE 802.3-2005 standard for 100BAZE-TX defines networking over two pairs of Category 5 unshielded twisted pair table or Type 1 shielded twisted pair table.
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SMSC Application Note download PDF