CXR Larus FO-E3T3-M3TR E3/T3 FO multimode modem 1310nm ST, LED for 4km, Modes: G703 transparent E3 34 Mbps and T3 45 Mbps Ethernet bridge 10/100BaseT, or G703 transparent T3 45 Mbps and E3 34 Mbps Ethernet bridge 10/100BaseT, or Ethernet bridge 10/100BaseT toward optical G703