Amazon.com: Mini Industrial 4 Port 10/100/1000Mbps Gigabit Ethernet POE + Switch with SFP Port Din Rail/Wall-Mount 4 Port 10/100/1000BASE-T RJ45 + 1 Port 100/1000FX (SFP) Support 12-48V DC : Electronics
Amazon.com: PoE Texas 4 Port PoE/PoE+ Injector with 48V 60W Power Supply - Gigabit Injector - Active Mode A Power Over Ethernet Multi Port PoE Adapter - Supports 4 PoE (802.3af or
GS-5220-24UP4XVR L2+ 24-Port 10/100/1000T Ultra PoE + 4-Port 10G SFP+ Managed Switch with LCD Touch Screen and Redundant Power (400W) - Planet Technology USA
12~48VDC input 4-port PoE + 1-port SFP Industrial Solar Power PoE Switch - E-link China Technology Co., Ltd.