So I have a quick question about POE. I see that a lot of the 48 port switches come with ~380watts of POE power. Even the 802.11at models. Now, even standard POE that is suppose to be able to supply ~15V per port would exceed the POE power. However, most devices don't seem to need even half of that power (VoIP phones for instance).
My question is, do certain newer switches handle this differently then older switches? For instance the Dell 5548P states that it will support 24 ports of POE. If you need more then that you have to purchase the optional external PSU (MPS600). How I read this is that even if a device uses less then the ~15v on a port, that doesn't allow you to connect a 25th device. However, looking at a newer POE+ switch like the HP 2920 or Netgear GS752TPSB it doesn't make this statement anywhere, just that all ports support POE+ (given enough power). So with these switches, if you have 24 VoIP phones that draw 7w max, are you able to plug in to the 25th, 26th,...48th ports?
Thanks.