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I have an IP Camera which is wireless so no ethernet cable but needs DC power from a 5.5 mm to 2.1 mm barrel plug. I have dc adapter in hand but the electric outlet is too far away from the IP Camera which is outside. I see unused Coax cable running near IP Camera. Same Coax cable runs near electric outlet inside the house. I want to use that coax cable to power IP Camera. I connect dc power adapter to end of coax inside house then connect other end to IP camera outside house. Any ideas what connectors to use?