The VN16118 is a single chip,1.25 Gigabits per second Ethernet transceiver. It performs all the functions of the Physical Medium Attachment (PMA) portion of the Physical layer, as specified by the IEEE 802.3z Gigabit Ethernet standard. These functions include parallel-to-serial and serial-to-parallel conversion, clock generation, clock data recovery, and word synchronization. In addition, an internal loopback function is provided for system debugging. The VN16118 is ideal for Gigabit Ethernet, serial backplane and proprietary point-to-point applications. The device supports both 1000BASE-LX and 1000BASE-SX fiber-optic media, and 1000BASE-CX copper media.