This document provides specifications for the DWDM-SFP10G-40-C19-T02 10G 1562.23nm 40km DWDM SFP+ transceiver. It includes details on its product description, features, functional diagram, optical and electrical characteristics, pin definitions, digital diagnostic monitoring interface, and package dimensions. The transceiver is designed for 10 Gigabit Ethernet links up to 40km over single-mode fiber and supports real-time monitoring of parameters like temperature, power levels and bias current through its digital diagnostic interface.