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No, there are no switches that are powerd by POE.
The POE uses one of the 4 pair in CAT cabeling so reasonably priced POE switches are slow 100Mb ps. POE switches use a LOT of power 8watts per port.
Costs are coming down now. £400 for a 24 port GB switch like Netgear GS724P. But does no-one at all do a small say 4-port switch powered by PoE, of which I could use many, to extend the number of points in our school network without rewiring.
Have just found that there are switches that are powered by PoE. Linksys SLM2005 and SLM2008 which are 5 and 8 port managed 10/100/1000 switches.
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