PoE Injectors › Forums › General Topics › I have a 12 port gigabit injector with redundant power Tagged: IP Phones This topic contains 1 reply, has 2 voices, and was last updated by Stephen 1 year, 7 months ago. Log In Register Lost Password Viewing 2 posts - 1 through 2 (of 2 total) Author Posts December 10, 2015 at 4:03 pm #9699 KarlyMember I have a 12 port gigabit injector with redundant power supplies, one of the blocks of 4 ports does not seem to work on some ports, so I moved a cable to another port and it arced. February 18, 2016 at 2:19 pm #9868 StephenKeymaster Which cable arced, an Ethernet cable or a power cable ? An arc when connecting the dc power cord is normal – it is best to connect the AC cord after the dc cord is connected. Connect one power supply to the mode A input and try all ports – which ones work, are there any arcs? Try again with the mode B input If all ports work with one power supply, then try again with both. Author Posts Log In Register Lost Password Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.