If project need CATV and Network together, use this WDM type. About WDM node we have active and passive type.The green port is input, RF port connect to set top box for TV, the blue port connect to ONU for network with AGC function, if the input can ensure no less than minus 8dbm,we recommend passive type.only for cable TV project, you can use this two type optical receiver. One is plastic shell, another is aluminum shell. This two type only box material different,inside part are same. Only want to watch tv can use in catv and network project too, but need with filter to ensure network wavelength not effect tv wavelength.Our active type can reach 85dbuv,other only can do 75dbuv.Our power supply is more stable and the use effect is better