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Description:Video Parameter 4 Channel Input PAL/NTSC 1Vpp@75ohm Video Compression MPEG4, Code Rate Control CBR/VBR , Output Code Rate 64KBPS~6MBPS Picture Respective 4 Channel Realtime QCIF(176X144) 30FPS CIF(352X288) 1-30FPS 2CIF(704X288) 1-30FPS 4CIF(704X576) 1-15FPS Audio Respective 4 Channel Audio Input 300mV max (On built-in Amplifier) 3000mVpp max (Off built-in Amplifier) Bidirectional Voice Talkback 1 Channel Audio Output 4000mVpp max Audio Compression G729 /ADPCM, Standard 8K/16K/48K Network Interface 10/100M Self-adapting Network Protocol TCP/UDP/MULTICAST/RTP/DHCP/RTP/HTTP, Support Dynamic IP Service Security User management supports the three-level password Alarm Alarm input and output can support mobile sensing, date, time, and event trigger Telemanagement Remote Configing DVS Working Parameter Online Upgrade Firmware Serial Server Optional RS322 Interface, Relative SDK For OEM PTZ Control RS485 Interface Alarm Input/Output 4 Channel Alarm Input 2 Channel Alarm Output Power 220VAC 2A Voltage AC220V 50/60HZ/AC110V 60HZ Power Dissipation 30W max Temperature -10-55degree Environment Humidity 20%-80% Size 19 Inch 1U Standard Chassis