... Video Server 1:There is the same network feature as ip camera. 2:channel, CIF 3:channel, D1 Digital Video Server1 Video Resolution ... 726, G711, ADPCMAudio Input1/2/4 channel, RCA port, liner input, Impedance:1KOhmsAudio Output1channel,RCA port, linear outputAudio talk-back input1 ... 0 standard. (Max 32G SD card), Support FTP server.Alarm Input 4 channel on/off input, supporting NO (normally open) ...