Altronix
eBridge 4SK Ethernet over Coax Adapter Kit
eBridge 4SK Ethernet over Coax Adapter Kit from Altronix allows you to combine four PoE/PoE+ devices over a single coax cable. The kit consists of an eBridge4SPT transceiver with integral 4 port managed PoE/PoE+ switch and an eBridge1SPR single port receiver. Power with battery backup is supplied via optional Altronix VertiLine563.
https://www.altronix.com/products/product.php?name=EBRIDGE4SK