We have installed Huawei IPC6225-VRZ-SP Bullet IP Cameras on different location for surveillance. We are in strange situation that three cameras have been burned one by one installed on CISCO POE Switch 2960 X. All other cameras are also installed on different CISCO 2960 switches and working fine. Can any one please help to rectify the issue. This is due to high voltage generating by 2960 Switch or may be any other reason.