The RUGGEDCOM RS400NC is an industrially hardened, serial device server with an integrated, fully managed, Ethernet switch, designed to operate reliably in electrically harsh and climatically demanding environments. 56-bit Encryption; 4 port serial server, 4 port managed Ethernet switch & an optional V.90 modem 48 VDC (36-59 VDC) XX = No power module 2 R = 19" Rack Mounting none XX = Manufacturing modification: none TXTX = 10/100BaseTX RJ45 2 = 4x RS232 via DB9 XX = No modem