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Power Over Ethernet

Mohana Prashantha
Intellectual 340 points

I have a doubt about Power over Ethernet.

Is it possible to daisy chain 2 to 3 PDs (powered Device)  with single PSE port. which is connected to first device?

Power shall be transmitted over spare lines.

  

 Thanks

  • 0
    TI__Expert 7990 points

    IEEE802.3 clause 33 (PoE) is defined as a point-point architecture, in parallel with the data flow architecture.

    It is possible to have a combination PD/PSE as a repeater that terminates and recreates the PoE power protocol (and maybe voltage regeneration) at each hop.  Careful atttention to transient power conditions must be thought through to avoid overloading any part of the chain.  I know of an application where one power redistribution was done.  This was not your proposal.

    I understand your architecture proposal to be one source with multiple parallel loads.  This is outside the IEEE standard PoE.  If you decide to go this route, you do not necessarily need to stay with the IEEE standard, a source hotswap and current-limited loads might work.  Again, careful attention to engineering the system is important to prevent power network collapse.  Bear in mind that this type system does not aid in preventing damge to a non-PD appliance if an unplugged cable is left energized at 48V.