... integrated circuit, realizes 1~8 channel voice (FXO, FXS) over fiber and 4 E1 circuit, 1 channels 100M Ethernet, 4 ... Wastage: 40db EnvironmentThe device operate temperature range wide, can work normally and stable in different environments.Operate temperature: 0C~50CRelative ... , working voltage range wide, good anti-disturb and isolation, work stable.DC-48V: voltage range -36V~-72VAC220V: voltage range ...