The RUGGEDCOM RS401 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. 128-bit Encryption; compact design, 4 port serial server, 4 port managed Ethernet switch & an optional V.90 modem HI = 87-264 VAC or 88-300 VDC XX = No power module 2 N = no mounting hardware xx = none XX = Manufacturing modification: none C2C2 = 100FX singlemode SC, Standard 20km 4 = 4x RS485 via 3 POS screw terminals. XX = No modem