POE+ VS EPOE

Discussion in 'NVR's, DVR's & Computers' started by Baldcamman, Mar 25, 2019.

Share This Page

  1. Baldcamman

    Baldcamman Young grasshopper

    Joined:
    Jan 7, 2019
    Messages:
    94
    Likes Received:
    13
    Location:
    Georgia
    What are the differences?
    If you need POE+ will ePoe by Dahua work?
     
  2. fenderman

    fenderman Staff Member

    Joined:
    Mar 9, 2014
    Messages:
    29,350
    Likes Received:
    8,713
    Therse are two different technologies. read up on both.
     
  3. tangent

    tangent IPCT Contributor

    Joined:
    May 12, 2016
    Messages:
    3,747
    Likes Received:
    2,411
    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.
     
    Last edited: Mar 25, 2019
  4. Baldcamman

    Baldcamman Young grasshopper

    Joined:
    Jan 7, 2019
    Messages:
    94
    Likes Received:
    13
    Location:
    Georgia
    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".
     
  5. fenderman

    fenderman Staff Member

    Joined:
    Mar 9, 2014
    Messages:
    29,350
    Likes Received:
    8,713
    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 balun.
     
  6. tangent

    tangent IPCT Contributor

    Joined:
    May 12, 2016
    Messages:
    3,747
    Likes Received:
    2,411
    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.
     
  7. Baldcamman

    Baldcamman Young grasshopper

    Joined:
    Jan 7, 2019
    Messages:
    94
    Likes Received:
    13
    Location:
    Georgia
    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.
     
    Last edited: Mar 26, 2019
  8. tangent

    tangent IPCT Contributor

    Joined:
    May 12, 2016
    Messages:
    3,747
    Likes Received:
    2,411
    If you look at specs for the NVR here's what it says:
    upload_2019-3-26_10-55-6.png
    ...
    upload_2019-3-26_10-55-28.png

    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)
     
  9. looney2ns

    looney2ns IPCT Contributor

    Joined:
    Sep 25, 2016
    Messages:
    6,661
    Likes Received:
    4,794
    Location:
    Evansville, Indiana
    From Dahua:
    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)
     
  10. Baldcamman

    Baldcamman Young grasshopper

    Joined:
    Jan 7, 2019
    Messages:
    94
    Likes Received:
    13
    Location:
    Georgia
    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.