The document discusses multiple power interfaces to ICT equipment operated by standardized -48V direct current, alternating current source and direct current source up to 400 V in line with the interfaces, operational voltage and characteristics detailed within ITU-T Recommendation and ETSI relevant standards. It also includes some details on the power architecture within the ICT equipment between the ICT power interface and the ICT end load. It will describes in details the following cases: no switch /combine upstream the converter. AC and AC input to ICT equipment with switch. DC and DC input to ICT equipment with combine circuit. DC and DC input to ICT equipment with switch Hybrid AC and DC input to ICT equipment with switch It includes description of impacts on the circuit between the input interface and converter inputs and possible specific solutions for : - power feeding protection lines - plugs and isolation, - power sharing control enabling separate battery test attached to redundant power feeds. - any other depending on impacts