Planet’s Aussie importer recently introduced a new line of products called “injector hubs” which I thought warranted a little further explanation. These at first glance appear to be similar to a PoE switch with only half the number of ports capable of PoE but they’re actually quite a bit different. They’re better thought of as a stack of PoE injectors built into one unit, and they’re hubs, not switches, which would quite often be used in conjunction with a switch per the diagram below. The other aspect is half the ports are inputs while the other half are outputs. eg in the case of the 48 port HPOE-2400G, 24 ports are inputs and 24 are outputs with PoE.
There’s 4 port, 12 port and 24 port versions available in either 10/100 or with gigabit throughput. (If the word “gigabit” isn’t in the decription assume 10/100). Check them out at the online shop here.