Product Description Network ProtocolRTSP;ONVIF;HKSDK External Interface USB2 × USB 3.0, 2 × USB 2.0 VGASupported (VGA and RS-232 interface cannot be used at the same time) Data network interface4, 1000 Mbps Ethernet interface Management network interface1, 1000 Mbps Ethernet interface MiniSAS interface1 COM1, RS-232 Storage HDD slot24 Interface/capacitySATA, Up to 20TB RAIDRAID5, RAID6, iRAID Performance Direct streaming mode: video (2 Mbps) picture400-ch Hardware Cache16 GB, extendable to 32 GB Processor64-bit multi-core processor Storage Management Disk managementDisk detection, pre-alarm, and repair Logical volume managementRecording volume management Recording Management Recording modeContinuous recording, manual recording, and alarm recording Video protectionVideo lock, video loss alarm Searching modeLog in storage system to search, play, and download videos. Support searching videos by time, event type, and smart information Downloading modeLog in storage system to search, play, and download videos. Support searching videos by time, event type, and smart information Device Maintenance Management modeGUI based on web, serial port CLI, platform Alarm modeAudio, indicator, GUI HDD HDD modelHikvision,HK7220AH,20T General Power supply100 to 240 VAC/47 to 63Hz, redundant power supply Consumption (with HDDs)≤ 369.8 W Environment temperatureWorking: 5 °C to 40 °C (41 °F to 104 °F) Storing: -20 °C to 70 °C (-4 °F to 158 °F) Environment humidityWorking: 20% to 80%RH (non-condensing/frozen) Storing: 5% to 90%RH (non-condensing/frozen) Dimension (W × H × D)445 × 746 ×175 mm (17.5 × 29.4 × 6.9 inch) Weight (without HDDs)≤40kg (88.2 lb) SKU: DS-AT1000S/440-1 Category: HiKvision Hybrid SAN