The RUGGEDCOM RX1500 series is a utility grade layer 2 and layer 3 switch and router. 2 x Power Supply (Hot Swappable) Field replaceable line modules Up to 24-ports 100FX Up to 24-ports 10/100TX Up to 8-ports Gigabit Ethernet Up to 12 ports 10FL / 100SX SC. ST. LC and MTRJ Pluggable Optics (SFP) Up to 4 T1/E1 ports Cellular (EVDO / HSPA)* DDS (56K Master/Slave. 64K Slave) Up to 24 RS232/422/485 HI = 88-300VDC or 85-264VAC. screw terminal block 24 = 24VDC (15-36VDC). screw terminal block RM = 19 Rack Mount Kit L3 = Layer 3 Switch XX = Manufacturing modification none L3SECL3HW = Layer 3 Security Edition (with L3 HW) FX50 = 4x 100FX SFP Blank (no optical transceiver) FG50 = 2x 1000LX SFP Blank (no optical transceiver) 6TX01 = 6x 10/100TX RJ45 6TX01 = 6x 10/100TX RJ45