Discussion in 'NVR's, DVR's & Computers' started by Baldcamman, Mar 25, 2019.
What are the differences?
If you need POE+ will ePoe by Dahua work?
Therse are two different technologies. read up on both.
802.3at (PoE+) is backwards compatible with 802.3af
ePoE cameras are compatible with 802.3af and would work with up to 328' of quality ethernet cable.
I don't believe any of the ePoE cameras draw enough power to need the extra power 802.3at can supply. Also as cable get longer they have more resistance and this can cause problems. As a result, I don't think any ePoE cameras use 802.3at.
ePoE is basically dahua's non-standardized attempt to boost the 100m (328') distance of the ethernet spec.
Does not compute. An 802.3at switch is capable of supplying 802.3at and 802.3af devices up to 100m away within the limits of the switch's total power budget.
Have been reading, that's why I ask. I am confused on the 802.3af and at. But asking Andy he said "Sure the NVR has 8 ePOE ports and 8 normal POE ports, the PTZ just normal POE+ can work on all of the ports easily".
you need to understand there are two separate technologies.
poe/poe+ with the plus signifying more power available at the end. Both are limited to 328f per spec.
epoe/epoe hi poe both of which provide extended distances and the hipoe can provide even more power than poe+ depending on distance.
epoe technology in the camera and nvr/switch can also allow it to be used with older coax cable by using the proper
If you aren't trying to go some super long distance just forget ePoE exists.
All the ports on the NVR that are capable of ePoE also support 802.3af PoE.
What cameras and what NVR are you looking at? PTZs need more power than fixed cameras.
Already have Dahua NVR5216-16P-4KS2E it has 8 epoe and 8 poe ports. The PTZ is on the way Dahua SD49225T-HN. The run is on a 75ft cat6.
If you look at specs for the NVR here's what it says:
The SD49225T-HN requires PoE+ (802.3at). All ports support 802.3at, ports 1-8 support ePoE which is irrelevant.
It can supply a maximum of 25.5W per port and 130W total. If you plugged in 7 of this PTZ and nothing else you'd exceed the power budget at night (fixed cameras use less power)
ePoE technology provides an eco-friendly surveillance solution that helps conserve energy to reduce your carbon footprint. Using only one Ethernet cable to span 800 m (2624 ft)
Thanks guys, I missed the /at in the specs making it poe+. I new the max output of the nvr was 130W and I would be around 115W with all my cameras and ptz.
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