The LumaOptics CWDM-XENPAK-4-XX is a high performance, cost effective optical transponder module. It consists of 10.3Gbit/s cooled EML 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 meet the requirements for 40km 10G CWDM Network and XENPAK MSA Rev 3.0.