... / fractional E1 channel; others support transparent E1 channelProvide 10/100M electrical Ethernet port, 100/1000M optical Ethernet port1E1 devices ... data flow among the valid E1 channelsMDI/MDI-X auto-crossover, 10/100M auto-negotiation and speed limitationAC220V and DC-48V ... 8/16Ethernet Interface Standard: IEEE 802.3, 802.3u.10/100M electrical port, 100/1000M optical portMDI/MDIX auto negotiationHalf ...