IES1028-4GS-4F Industrial Ethernet Switches Consists of 20 Ethernet Ports, 4 Fiber Ports and 4 Gigabit (SFP Slot) Ports That Proceed An Economical Solution for Your Industrial Ethernet Connection. The IES1028-4gs-4f Switches have an operating temperature range of -40 to 75 ° C, and are designated with low consumption and without fan. The RugGed Hardware Design Makes The IES1028-4GS-4F Perfect for Ensuring That Your Ethernet Equipment Can Withstand the Rigors of Industrial Applications.