The LumaOptics XENPAK-SR is a high performance, cost effective optical transponder module. It consists of 10.3Gbit/s VCSEL optical transmitter and PIN receiver, 4x3.125Gbps Ethernet Signal input XAUI interface, Mux and Demux with clock and data recovery (CDR). Digital diagnostics functions are available via MDIO 2-wire bus, They are compliant with IEEE Std 802.3ae 10G Ethernet 10GBase-SR and XENPAK MSA Rev 3.0.