... 170X series chip 3.Audio Compression Standard:G.726 4.Multi-windows,Alarm. Hardware Compression CardModel: ZS-1704HP 1.17 ... selected ,BNC socket,1.0Vp-p,resitance:75ΩVideo compression code rate20K~4M bpsType of video streamvideo stream/ complex ... ×288,horizontal line 270,vertical line 250 Audio parameterAudio Compression StandardG.726Audio sampling frequency8KHzAudio Input4 channels audio input ,RCA ...