12 Volt Power Over Ethernet Switch

Discussion in 'General Discussion' started by lamboman, Oct 5, 2004.

  1. lamboman

    lamboman Network Guru Member

    Is there a 12 Volt Power Over Ethernet Switch?

    If Not, how do I provide power to a group of 10 LinkSys WAP54G via POE? I don't want to use 10 LinkSys POE kits because it would take a lot of space on multiple power strips.

    Can I use a POE switch and then some type of step down to 12 volt?

    Please help. :?:

    thank you.
  2. paulw11

    paulw11 Network Guru Member

    I'm afraid not

    The 802.af Power Over Ethernet standard supplies 48V DC. In theory, as 802.3af chipsets become available, it should be possible to build a box that brings the voltage down to 12V, but I haven't seen anything like that yet.

    As an alternative, the Linksys specs say that the 54G uses 12V at 1.0 amp (in fact it probably uses less than 1 amp), but you should be able to buy a couple of 4 or 5 amp switch mode 12V supplies pretty cheaply rather than using 10 individual power supplies. Also PC power supplies are pretty cheap and can typically supply 12V at 15 amps, so one of those would probably do the trick.

  3. SimonMackay

    SimonMackay Network Guru Member

    802.3af solution for your problem.


    What you will need to get the most out of the Power-Over-Ethernet setup would be an IEEE 802.3af-compliant midspan hub or Ethernet switch (most of which are priced at business-class prices) for the network; and one IEEE 802.3af-compliant 12-volt or universal-voltage active splitter per device. AFAIK, the Linksys Power-Over-Ethernet kit is 802.3af-compliant and you could use the splitter that is in the kit with a midspan power hub or powered Ethernet switch.

    The midspan hub or powered Ethernet switch will provide the "juice" for all the devices while using one power outlet on the power strip.

    With regards,

    Simon Mackay
  4. paulw11

    paulw11 Network Guru Member



    I didn't know that the Linksys POE adapter as 802.3af compliant but the manual says it is. The manual says you can use the kit to supply power to a device that accepts power over ethernet, but doesn't say whether you can use the POE "Receiver" with an 802.3af switch - there doesn't seem to be a way to set the voltage that the "Receiver" should deliver. It would be interesting to see if it works.

  5. lamboman

    lamboman Network Guru Member

    Red Hawk makes one

    I just found out that Red Hawk has a modular hub with different POE modules. 12 to 24 to 48. Does anyone know if their products are good?

  6. paulw11

    paulw11 Network Guru Member

    Haven't used it but it looks good

    From a quick read of their page you will need a 10 slot chasis with 10 802.3af modules and a PowerSense BL-8712 for each WAP as the WAP54G does not support POE directly.

  7. lamboman

    lamboman Network Guru Member

    Their 8300 series does

    "BL-8320 20 Power & Data Modules - 12V support - Call for compatability"

    I called them and they said that they have 12V support that would work with the LinkSys.
  8. btsforklift

    btsforklift Networkin' Nut Member

    Another solution...

    Something like this may also help in the meantime...PanOptic Technology makes quite a few elegant solutions for providing power to non-PoE devices over Cat-5 cabling: http://www.panoptictechnology.com/network-smart-adapters/
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