... channels with 2Mbit/s interfaces and with V.24/V.28/RS232, V.35, V.36, RS449, X.21, RS485, ... balance response: Attenuation complies with the law of square root of frequency, and is within the range ... and artificial codeInput ImpedanceDatacom Inde(1) Data interface type: V.24, V.35, V.36, X.21, RS-449, RS-485 ... hoursCharging: 8 hours at power-off state, and 12 hours at power-on state.Dimension and weight;L ...