The TenGiPHY-L is a single chip transceiver IC for 10 Gbit/s Ethernet and Fibre Channel connectivity. It offers a serial, full duplex 10 Gbit/s, XFI compliant interface to optical components or to a serial fiber-optic module (XFP). The integrated CDR and CMU operate at a data rate of 10.3125 or 10.51875 Gbit/s. The TenGiPHY-L provides the XGXS, PCS and PMA sublayers of the 10 Gbit/s Ethernet and Fibre Channel standards. At the system side, a quad serial XAUI interface connects the TenGiPHY-L to the upper layers. The networking system can control the chip via a narrow-width MDIO interface by writing and reading its control and status registers.