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