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| Hardware | |||
| CPU | Intel® Atom C3538 Quad-core 2.1GHz | ||
| Hardware encryption engine | Yes (AES-NI) | ||
| GPU | NVIDIA® GeForce® GTX 16509 | ||
| Memory | 8 GB DDR4 non-ECC SO-DIMM (4 GB x 2; expandable up to 32 GB with 16 GB ECC SO-DIMM x 2)10 | ||
| Compatible drive type | 4 x 3.5” or 2.5” SATA HDD/SSD (drives not included) | ||
| Hot swappable drive | Yes | ||
| External port | • 3 x USB 3.2 Gen 1 port • 2 x eSATA port | ||
| Size (HxWxD) | 166 x 250 x 237 mm | ||
| Weight | 4.92 kg | ||
| LAN port | 4 x 1GbE RJ-45 | ||
| Wake on LAN/WAN | Yes | ||
| Scheduled power on/off | Yes | ||
| System fan | 1 (120 x 120 x 25 mm) | ||
| AC input power voltage | 100V to 240V AC | ||
| Power frequency | 50/60Hz, single phase | ||
| Operating temperature | 0°C to 40°C (32°F to 104°F) | ||
| Storage temperature | -20 °C to 60 °C (-5 °F to 140 °F) | ||
| Relative humidity | 5% to 95% RH | ||
| Maximum operating altitude | 5,000 m (16,400 ft) | ||
| Networking protocol | SMB, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Telnet, SSH, SNMP, VPN (PPTP, OpenVPN™, L2TP) | 
| File system | • Internal: Btrfs, ext4 • External: Btrfs, ext4, ext3, FAT, NTFS, HFS+, exFAT11 | 
| Supported RAID type | Synology Hybrid RAID (SHR), Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10 | 
| Storage management | • Maximum single volume size: 108TB • Maximum system snapshots: 65,53612 • Maximum internal volume: 64 | 
| SSD cache | Read/write cache support | 
| File sharing capability | • Maximum local user account: 2,048 • Maximum local group: 256 • Maximum shared folder: 512 • Maximum concurrent SMB/NFS/AFP/FTP connection: 2,000 | 
| Privilege | Windows Access Control List (ACL), application privileges | 
| Directory service | Windows® AD integration: Domain users login via SMB/NFS/AFP/FTP/File Station, LDAP integration | 
| Security | Firewall, shared folder encryption, SMB encryption, FTP over SSL/TLS, SFTP, rsync over SSH, login auto block, Let's Encrypt support, HTTPS (customizable cipher suite) | 
| Supported browser | Chrome® | 
| Maximum IP camera | 32 channels (total of 960 FPS at 720p, H.264), including a maximum of 12 real-time Deep Video Analytics tasks13 8 free camera licenses included; additional cameras require the purchasing of additional licenses | 
| Deep video analytics feature | Face recognition People counting People and vehicle detection Intrusion detection | 
| License Plate Recognition | |
| Vehicle counting | |
| IP Camera support | Video codec: H.264, H.264+, H.265, H.265+, MJPEG, MPEG-4, and MxPEG (not supported by Deep Video Analytics tasks) Audio codec: PCM, AMR, G.711, and G.726 Camera bit-rate fine-tuning via constant and variable bit-rate control | 
| ONVIF™ 2.6, Profile S certified, Profile G for edge recording | |
| Live View | Pan Tilt Zoom (PTZ) support with configurable PTZ speed On-screen camera controls: camera zoom, focus, iris adjustment, auto pan, and auto object tracking E-Map, Snapshot, and Snapshot Editor supported for instant editing after taking a snapshot Video quality settings: bit-rate control, image quality, resolution, and FPS | 
| Joystick support for easy navigation | |
| Alert panel for a quick display of the most recently triggered events | |
| Customizable layout and sequential camera view support | |
| Recording | Supported recording modes: manual, continuous, motion detection, I/O alarm, action rule, and customized Recording formats: MP4 The customized recording mode can be configured as a combination of conditional events, including motion detection, audio detection, tampering detection, and alarm input | 
| Edge recording on the SD card of certain supported cameras | |
| Configurable pre-recording and post-recording time | |
| Playback | Customizable layouts for playback in Timeline Playback controls include pause, stop, previous recording, next recording, fast forward, slow motion, frame by frame, and digital zoom in/out | 
| Embedded watermark for evidence integrity | |
| Image enhancements including brightness, contrast, saturation, and sharpness (web client only) | |
| Management | Create and manage different user privileges Rotate recorded videos by archived days or storage size Event notification supported via SMS, E-mail, and mobile devices via DS cam Recordings can be backed up to an external storage or remote server | 
| Built-in NTP server | |
| Supported tunnel: MPEG-4, H264 via RTSP over TCP, UDP, and HTTP | |
| iOS/Android™ applications | synology LiveCam, DS cam, DS file, DS finder | 
| Surveillance desktop client support | Windows® 7 onwards, macOS® 10.12 onwards | 
| Package content | 1 x DVA3221 main unit 1 x Quick Installation Guide 1 x Accessory pack | 
| 1 x AC power cord | |
| 2 x RJ-45 LAN cable | |
| Optional accessories | 16 GB DDR4 ECC SO-DIMM (D4ECSO-2666-16G) Synology Expansion Unit DX517 | 
| Surveillance Device License Pack | |
| Warranty | 3 years |