CXR Larus MX-E3T3-F-16BNC-CLK Fiber optic multplexer 2U 19 E3/T3 Multiplexer + Ethernet over fiber optic, dual SFP (1+1) w/o SFP module, carry 16x E1/T1, BNC 75 Ohms and a 3 ports 10/100BaseT Ethernet at 45 Mbps , 2 slots for power supply, system clock option included