The module is used in the C-COR FOX-x36 node series. Many older versions of this type are built with Fabry-Perot laser, and they are by all bandwidth limited. COMTECH is able to change the laser to a DFB one with higher power and even with CWDM wavelength. The upgrade task contains by default a fully comprehensive test procedure, which concerns not only the modified functions. After this a new label with modified type code and parameter list is sticked on the housing.