Fronius, Power Supply DatCom, 43,0001,1211 One power pack can supply up to eight DATCOM components. No additional supply cables are needed for this. The data communication cable is used to provide power between components. If a system only has one Fronius IG or Fronius IG Plus but more than 3 DATCOM components, the Com card in the Fronius IG or Fronius IG Plus may not provide sufficient power for all DATCOM components. This means that the green LED would not light up on all DATCOM components. In this case, the additional power pack should be plugged into one of the DATCOM components with no green LED.