Channel: 8 Port Compress Rate: Hardware=2;Software=5 Module voltage resistance: 250 V Codec: HDB3 /AMI Max installation for 1 PC: 5 (40 channel) Signal-To-Noise: ≥ 30 dB Frequency Range: 300 - 3400 Hz（±3dB） Input Impedance: 600 Ω Clock and Data Recorering: CCITT Rec.G.823-1988 Frame Structure: CCITT G.704-1988 Data Rate: 64,32,16 KBPS Cash: 32~256 K Byte Interface: RJ11 Voice Distortion Rate: ≤2 % Caller ID: FSK、DTMF FSK Modulate Mode: Logical 0:2200 Hz±1% Logical 1:1200 Hz±1% Signal Monitor: Signal sound,voice sound DTMF Code: 0~9,*,#,A,B,C,D Data Transmission: Binary asynchronous serial Voice Function: WAV, VC2, VC5,AGC Exchange: 256 CH directly Power consumption: ≤ 15 W Storage Temperature: -20 ºC-70 ºC Working Temperature: 5 ºC- 40 ºC Humidity: 5 %- 85 % Dimensions: 180*112 mm Weight: 0.51 KG