When powering through POE injector with passive poe (always power on and on different from data pins) - its working. So looks like Hikvoision cameras not always working correctly with 802.3af/at and not starting. the wire length is around 50meters (cat 5e copper). two different hikvisoin cameras...
I have similar issue with DS-2CD2T47G2-L (C) camera. Sometimes after power loss camera does not start after resuming power. Changing port on poe switch does not help. Unplugging and pluggining port to poe switch does not help. POE power just not coming to camera (poe led is off). But...
