Allow me to try and explain my theoretical connection as I do not have the equipment to try this idea.
equipment:
1- dahua 8 Channel 4K NVR with 8 POE Product# NVR-ELE8M-P4K
2 - dahua 3MP IP Network Security Camera Product# IPOD-EL3IRE 802.3af
125 ft run of CAT5E STP wire
run the wire between the the NVR and the the location of the 2 cameras.
break the the w/or and w/gr pairs out and terminate in RJ45 plug on pins 1-2-3-6
break out the w/bl and w/br pairs out and terminate in RJ45 plug on pins 1-2-3-6
Now I will demonstrate my total lack of knowledge of POE.
after plugging in both RJ45's into the NVR and the two cameras , would the NVR sense that there is no resistance on the pins 4-5-7-8 of both camera's and see resistance on pins 1-2-3-6 and apply protocol 802.3af endpoint alternative A (Phantom Power) to power both cameras ?
as a follow up question if the above does indeed work. If I were to run another single wire and terminate RJ45 plug with all pins and plug in to a camera and NVR would it sense resistance on pins 4-5-7-8 on that camera and use 802.3af midspan alternative B protocol.
The question being, does this NVR support both 802.3af protocols at the same time?
At this time I would like to express my gratitude to security camera king for this support forum. You would never get this from a purchase direct from an asian company. Than you !