Use of PoE injectors is a convenient, low-cost way to power a PD and then manage the PD across the LAN. However, commercial PoE injectors introduce severe limitations as they don’t necessarily represent a compliant PSE and have no ability to police power draw near to or at the 802.3 standard boundaries where PDs should be tested. Further, injectors don’t support PD input voltage extremes such as low voltage where current levels are maximized. Test strategies that add long cable spools between PSE and PD may add to “peace of mind” but the truth is that there is nothing “calibrated” about a 100 meter spool of cable in line with an uncharacterized PSE.