Digital Video Server 1:There is the same network feature as ip camera. 2:channel, CIF 3:channel, D1 Digital Video Server1 Video Resolution: D1 ... 4channel, D1KD-DS204DX-3G4 channel, D1, support 3G Network:EVDO( CDMA2000),WCDMAVideo Input 1/2/4 channel composite video, PAL or NTSC, ... open) or NC (normally close) sense.Alarm Output 4 channel on/off output,120VAC 1A/24VDC 1AAlarm MessageSending alarm ...