Coarse Wavelength-Division Multiplexing Small Form-Factor Pluggable Plus solution is a convenient and cost-effective solution for the adoption of 10 Gigabit Ethernet in data-center and metropolitan-area access networks. There are 18 center wavelengths available from 1270 nm to 1610 nm, with each step 20 nm. Transmission distance from 10km, 20km, 40km up to 80km. Digital diagnostic functions are available via an I2C.