Hi, the installers we work with have a very poor understanding of electronics, yet they install huge numbers of access points, cameras and phones.  The low voltage POE solution is ohms law together with a quadratic equation to get the right input values.  Giving them a tool to see if their design will work before it is deployed, or finding out why it fails when it doesn't work right - seems like a service. Plus, the same paragraph has a link to a catalog of POE products without any educational aspect, so confused why that advertising link is OK but a calculator is not???