Industrial Ethernet Switch with 4x Ethernet Ports and 1x Fiber Port. The NS-205F/NSM-205F is a 4-port unmanaged Ethernet with 1 fiber port switch. Using fiber optics, you can prevent noise from interfering with your system and supports high-speed (100 Mbps) and high-distance (up to 15 km) transmissions.The NS-205F/NSM-205F provides a wide 10 to 30 VDC power range to fit all the common power standards found in industrial automation, without extern..