RUGGEDCOM RS900 is a 9-port. industrially hardened. fully managed Ethernet switch with 128-bit encryption supporting 6 Fast Ethernet RJ45 ports and up to 3 Fast Ethernet Fiber ports available over multiple fiber connector types and distances. 24 = 24 VDC (10-36 VDC) XX = No power supply 2 D = DIN Rail Mounting xx = none XX = Manufacturing modification none MC-XX = 1 x 100FX - Multimode 1300nm. SCconnector. and 1x no port MT = 1 x 100FX - Multimode 1300nm. ST connector