... functions.SpecificationsE1 Fiber Optical ModemE1 and RS23275ohm and 120 ohmG.703 Fiber Optic ModemE1 PDH Multiplexer ,2M E1E1 Fiber Optical Modem ... balance 120ohm E1 interfaceInterface ParametersE1 interface : Accord with TTU-TG.703 , G.823 Code type : HDB3 ,all necessary alarm functions Bit ... Characters: Dimension:220*165*35mm Weight:900g Multi-Service G.703 E1 Fiber Optical Modem