I thought I would put this out there and see if anyone has experienced similar issues with using the 3500 or 2960 series of Cisco network switches. We have very many installations using the lower end ESW Series and have had no issue whatsover in using any brand of IP camera powered via PoE. Recently on several projects we have starting using the 2960 series. We first noticed on a new installation the some cameras were having trouble negotiating PoE power. Sometimes they would work, sometimes not . A power cycle of the switch would then power up other cameras and then not ones previuously powered. Sounds like a power issue but we are way under the max PoE power consumption for those swicthes. This happen with Arecont cameras, 3 differnt models both Bullet syel and Megadome. We struggled with Cisco and Arecont back and forth , each blaming the other company's product. We resolved it by moving all cameras off PoE and back to 12/24 rack mount power. Well since, then on an existing install, we did a network upgrade changign all ESW series untis out for new 2960 and 3500 series units. This install had all IP cameras from 3-4 brands powered and working perfectly thru the ESW switches. After installing the new switches we had many cameras from all brands either fail to PoE power or even less commonly, pull PoE power but no link. Cisco is telling us that these cameras manufacturers are not follwing tru PoE standards with their Class assignments meaning that the camera is asking for one wattage and actually needing another. Putting external PoE injectors gets the cameras linked back up but defeats the purpose and function of high end expensive networking equipment. This happened on Stardot, Arecont, Vivotek and Axis cameras/encoders, all exibiting the same behavior. Not sure if anyone out there can shed light on this issue.