Getting POE+ From POE Switch...

I have a 48 port Trendnet switch* that has 18 ports unused. Although louder than a central vacuum, it has otherwise worked well.

I am now needing two POE+ ports, 802.3.at. Do I have to buy a new switch/injector or is there away to use combine multiple ports on the 802.3.af POE to produce a single POE+ port?

There are POE+ powered hubs that output both POE af and POE+ at, but I haven't seen one that outputs POE+ from multiple POE inputs, though I think it should be possible.

Ideally, a little Y adapter right at the switch would be cool. Does something like that exist?

*was given to me for free...

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