IES1028-4GS-12F Industrial Ethernet Switches Consists of 12 Ethernet Ports, 12 FIBER Ports and 4 Gigabit (SFP SLOT) Ports That Provide An Economical Solution for Your Industrial Ethernet Connection.IES1028-4GS-12F Switches have an operating range of -40 to 75 ° C, and are Designed with Low Consumption and Without Fan. The RugGed Hardware Design Makes The IES1028-4GS-12F Perfect for Ensuring That Your Ethernet Equipment Can Withstand the Rigors of Industrial Applications.