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TS-251A Specification

TS-251A
Specification
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Ordering P/N TS-251A-4G TS-251A-2G
Processor 14nm Intel® Celeron® N3060 dual-core 1.6GHz (up to 2.48GHz)
Hardware Encryption Accleration
 ✓，AES-NI
System Memory 4GB DDR3L (2 x 2GB) 2GB DDR3L (2 x 1GB)
Maximum Memory 8GB
Memory Slot 2 x SODIMM DDR3L (For dual-DIMM configurations, you must use a pair of identical DDR3L modules.)
Flash Memory 4GB, pre-loaded with QTS system
Drive Type 2 x 3.5"/2.5" SATA 6Gb/s HDDs/SSDs
GbE LAN 2 x Gigabit RJ45 LAN port
USB Port 3 x USB 3.2 Gen 1 ports (Front: 1, Rear:2)
SD Card Reader ✓
USB QuickAccess ✓ (USB 3.2 Gen 1 Micro-B); USB cable is not included
HDMI™ 1, max. resolution 3840 x 2160 @ 30Hz
Audio Input 3.5mm Microphone Input jack (for dynamic microphone)
Audio Output 3.5mm Line Out jack (for ampliers or speakers)
LED Indicator Status/Power, USB, HDD 1, HDD 2
Button Power/Status, USB one-touch-backup, reset
IR Receiver ✓, supports QNAP RM-IR002 and MCE-compliant remote controls
Others Kensington security slot，system maintenance port
Dimension 169 x 102 x 219 mm
6.65 x 4.02 x 8.62 inch (HxWxD)
Weight Net: 1.53kg (3.37 lbs)
Gross: 2.61kg(5.75 lbs)
Operating Temperature 0-40˚C
Relative Humidity 5~95% RH non-condensing, wet bulb: 27˚C
Noise Level 18.3 dB (A)
Power Consumption System sleep: 0.72W
HDD standby：7.9W
In operation：16.2W
(with 2 x 2TB HDDs)
Power 65W AC power adapter, 100-240V AC
Fan 1 x 7cm system fan (12V DC)
Note: Use only QNAP memory modules to maintain system performance and stability. For NAS devices with more than one memory slot, use QNAP modules with identical specifications and refer to the hardware user manual to install compatible QNAP memory modules.
Warning: Using unsupported modules may degrade performance, cause errors, or prevent the operating system from starting.
QNAP reserves the right to replace partial parts or accessories if the original is no longer available from its manufacturer/supplier. Any replacement would be fully tested and verified to meet strict compatibility and stability guidelines and will deliver identical performance to the original.
The terms HDMI, HDMI High-Definition Multimedia Interface, HDMI trade dress and the HDMI Logos are trademarks or registered trademarks of HDMI Licensing Administrator, Inc.
Product images are for illustrative purposes only and may differ from the actual product. Due to differences in monitors, colors of products may also appear different to those shown on the site.
Designs and specifications are subject to change without notice.
Operating System
QTS 4.2 (embedded Linux)
Network & Virtual Switch
  1. DHCP client, DHCP server
  2. USB Wi-Fi Adapter Support
  3. Virtual Switch
Supported Client OS
  1. Apple Mac OS 10.7 or later
  2. Linux and UNIX
  3. Microsoft Windows 7, 8, and 10
  4. Microsoft Windows Server 2003, 2008 R2, 2012, 2012 R2 and 2016
Access Right Management
  1. Batch users creation, import/export users
  2. User quota management
  3. Local user access control for CIFS, AFP, FTP, and WebDAV
  4. Application access control for Photo Station, Music Station, Video Station, and File Station
  5. Subfolder permissions support for CIFS/SMB, AFP, FTP, and File Station
Supported Browsers
  1. Microsoft Internet Explorer 10+ , Google Chrome, Apple Safari 7+, Mozilla Firefox
Domain Authentication Integration
  1. Microsoft Active Directory (AD) & Domain Controller support
  2. LDAP server, LDAP client
  3. Domain users login via CIFS/SMB, AFP, FTP, and File Station
Multilingual Support
  1. Chinese (Traditional & Simplified), Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese (Brazil), Romanian, Russian, Spanish, Swedish, Thai, Turkish
myQNAPcloud Service
  1. Private cloud storage and sharing
  2. Free host name registration (DDNS)
  3. Optional myQNAPcloud SSL certificates (DDNS)
  4. Auto router configuration (via UPnP)
  5. Web-based file manager with HTTPS 2048-bit encryption
  6. myQNAPcloud Link for remote access without any complicated router setup
  7. myQNAPcloud connect for easy VPN connection (Windows VPN utility)
File System
  1. Internal Hard Drive: EXT4
  2. External Hard Drive: EXT3, EXT4, NTFS, FAT32, HFS+
Qsync
  1. Sync files across multiple devices with SSL secure connection
  2. Selective synchronization for only syncing specific folders
  3. Use team folders as a file center for greater team collaboration (maximum sync tasks:32)
  4. Shares files by links via e-mail
  5. Policy settings for conflicting files and file type filter support
  6. Version control: up to 64 versions.
  7. Supports central configuration mode
  8. Supports remote erase/restore
  9. Supports Windows & Mac OS
Networking
  1. TCP/IP (IPv4 & IPv6: Dual Stack)1
  2. Dual Gigabit NICs (failover, multi-IP settings, port trunking/NIC teaming)
  3. Service binding based on network interfaces
  4. Squid Proxy server & Proxy client
  5. Protocols: CIFS/SMB, AFP (v3.3), NFS(v3), FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, and SMSC
  6. UPnP & Bonjour Discovery
Web Administration
  1. Multi-window, multi-tasking based system management
  2. Dynamic DNS (DDNS)
  3. SNMP (v2 & v3)
  4. Resource monitor
Security
  1. Network access protection with auto-blocking: SSH, Telnet, HTTP(S), FTP, CIFS/SMB, AFP
  2. CIFS host access control for shared folders
  3. FIPS 140-2 validated AES 256-bit volume-based and shared folder data encryption 2
  4. AES 256-bit external drive encryption2
  5. Importable SSL certificates
  6. Instant alerts via email, SMS, beep, and push service
  7. 2-step verification
Network recycle bin for file deletion via CIFS/SMB, AFP, and File Station
  1. Comprehensive logs (events & connection)
  2. Syslog client/server
  3. Mobile app: Qmanager for remote system monitoring & management
Storage Management
  1. Storage Space Utilization monitoring
  2. QNAP flexible Volume/LUN with thin provisioning and space reclaim3
  3. Disk volume types
    • RAID 0,1, JBOD, single
  4. Supports storage pools
  5. Supports volume/LUN snapshots, up to 256 per system (4GB System RAM required)3
  6. Online volume expansion
  7. Online storage pool expansion
  8. Online RAID capacity expansion and online RAID level migration
  9. SMART data migration
  10. Storage expansion via a QNAP UX-500P/UX- 800P expansion unit
  11. JBOD enclosure roaming
  12. SSD read-only/read-write cache
File Server
  1. File sharing across Windows, Mac, and Linux/ UNIX
  2. Windows ACL
  3. Advanced folder permissions for CIFS/SMB, AFP, FTP
  4. Shared folder aggregation (CIFS/SMB)
Power Management
  1. Wake on LAN
  2. Internal hard drive standby mode
  3. Scheduled power on/off
  4. Automatic power on after power recovery
  5. USB and network UPS support with SNMP management
  6. System sleep mode (S3)
 
Powerful All-in-one server
FTP Server
  1. FTP over SSL/TLS (Explicit)
  2. FXP support
HD (HybridDesk) Station
  1. Playback videos, music, photos on TV with Kodi via HDMI™
  2. Watch various online contents
  3. Web browsers (Chrome, Firefox)
  4. Supports international keyboards, input and mouse
  5. Supports QNAP Qremote app and the official Kodi remote app
  6. Supports user login permissions
  7. A variety of applications are available including Skype, Plex Home Theater, and more
Note: The playback and quality of some video files may be affected by the system's CPU and GPU decoding abilities.
File Station
  1. Supports mounting cloud drives (such as Google Drive, Dropbox, Microsoft OneDrive, Amazon Drive, Yandex Disk and Box).
  2. Supports mounting remote shared folders through FTP, WebDAV or Microsoft networking (SMB/CIFS)
  3. Supports opening documents via Office Online, Google Docs or Chrome Extension (Edit Office files in Google Docs, Sheets, and Slides)
  4. Supports ISO Mounting (Up to 256 ISO Files)
  5. Drag-n-drop Files via Chrome and Firefox Browsers
  6. Photo, music, and video preview and playback with hardware-accelerated transcoding
  7. File Compression (ZIP or 7z)
  8. Supports displaying subtitles (*.SRT, UTF-8 format)
    - Video seeking support for video playback during on-the-fly transcoding
    - Supports slideshow playback in media viewer
  9. Mobile App: Qfile for file browsing and Management
Linux Station
  1. Use your NAS as a Ubuntu PC using the NAS HDMI™ output.
  2. Download and use a variety of applications from the Ubuntu Software Center.
  3. Supports remote desktop to monitor and access Ubuntu remotely.
  4. An open source software platform for developers.
Note: The NAS requires at least 4GB RAM and Container Station must be installed.
Transcode Management
  1. Transcode video files to 240p, 360p, 480p, 720p and 1080p resolution
  2. Automatic video transcoding for watched folders
  3. Hardware accelerated transcoding support
  4. Embed subtitles into videos for background Transcoding
Virtualization Station
  1. Supports Virtual Machine (VM) creation to run operating systems such as Windows, Linux, Unix and Android
  2. Supports VM import and export, cloning & snapshot, backup and restore
  3. VM console can be displayed via HDMI™ output - QVM
  4. HTML5-based shared remote console
  5. Supports three different networking modes: Isolated, External-only and Bridged
Backup Station
  1. Remote replication server (over rsync)
  2. Real-time remote replication (RTRR) to another QNAP NAS, FTP or CIFS/SMB server
  3. Works as both RTRR server & client with bandwidth control
  4. Real-time & scheduled backup
  5. Backup versioning for RTRR
  6. Snapshot support for RTRR/Rsync
  7. Encryption, compression, file filter, and transfer rate limitation
  8. Desktop backup with QNAP NetBak Replicator for Windows
  9. Apple Time Machine backup support
  10. Data backup to multiple external storage devices
  11. Third party backup software support: Veeam backup & replication, Acronis True Image, Arcserve backup, emc retrospect, Symantec Backup Exec, etc.
Container Station
  1. Supports LXC and Docker
  2. Download applications from the built-in Docker Hub Registry
  3. Supports one-click installation, container export/import & console mode
  4. Supports two network modes (NAT and host)
  5. Supports auto-start containers
  6. Supports downloading Docker certificates
  7. Supports adding private registries
Cloud Drive Sync
  1. Multiple cloud account management like Google Drive, Dropbox, OneDrive, and hubiC
  2. Supports multiple cloud accounts
  3. Concurrent job execution and multi-threaded data transfer
  4. Per-account bandwidth throttling
Qsirch
  1. Supports full-text search in real-time
  2. Bar chart to show data distribution
  3. Supports previews for photos, music, videos, Gmail, PDF .etc
  4. Show search results using thumbnails or a list
  5. Supports search Chrome extension
Cloud Backup Station
  1. Amazon S3 Plus (including Amazon S3), Glacier
  2. Google Cloud Storage
  3. WebDAV-based cloud storage
  4. Microsoft Azure
  5. OpenStack Swift
iSCSI (IP SAN)
  1. iSCSI target with multi-LUNs per target (Up to 256 targets/LUNs combined)
  2. Supports LUN mapping & masking
  3. Online LUN capacity expansion
  4. Support for SPC-3 persistent reservation
  5. Supports MPIO & MC/S
  6. iSCSI LUN backup, one-time snapshot, and restoration
  7. iSCSI connection and management by QNAP Windows Qfinder
  8. Virtual disk drive (via iSCSI initiator)
  9. Stack chaining master
  10. Max No. of virtual disk drives: 8
Print Server
  1. Max number of printers: 3
  2. Supports Internet Printing Protocol
  3. Print job display and management
  4. IP-based and domain name-based privilege Control
Surveillance Station
  1. Supports over 3,000 IP cameras
  2. Includes 2 free camera licenses, up to 32 camera channels by purchasing additional licenses
  3. Instant playback to check recent events
  4. Visual aid by e-map
  5. Playback and speed control using the shuttle bar
  6. Video preview on playback timeline
  7. Intelligent video analytics (IVA) for advanced video searching
  8. Surveillance client for Mac
  9. Mobile surveillance app: Vmobile (iOS and Android)
  10. Mobile recording app: Vcam (iOS and Android)
Photo Station
  1. Show photos by thumbnails, list, timeline, or folder view
  2. Tag photos with text, colors, and ratings
  3. Slideshows with background music and different transition effects
  4. Geotag photos and display them on Google maps
  5. Supports uploading photos/videos to Picasa, Flickr, Weibo, YouTube
  6. Supports face detection (with the Photo Station Extension)
  7. Supports PDF to image conversion (with the Photo Station Extension)
  8. Supports Facebook friends login
VPN Server
  1. Secure remote access: PPTP、L2TP/IPsec & OpenVPN VPN services
  2. Max number of clients: 45 (15 clients for each protocol)
Music Station
  1. Play or share music via web browser
  2. Supports changing album covers via Google search or by uploading photos.
  3. Internet radio (MP3)
  4. Up to 8 music alarms
  5. Mobile app: Qmusic for music streaming and Management
VPN Client
  1. Supported VPN protocols: PPTP and OpenVPN services
  2. PPTP Authentication: PAP, CHAP, MS-CHAP, MS-CHAPv2
  3. PPTP Encryption: None, AES 40/128 bit, AES 256 bit
  4. OpenVPN Encryption: None, AES 40/128 bit, AES 256 bit
  5. Transmission package monitor
  6. OpenVPN port control & link compression
DLNA Server
  1. Supports DLNA/UPnP TVs and players such as PlayStation 4 and Xbox One
  2. Support CUE indexing file for APE, FLAC audio format.
  3. Video and Audio On-the-fly Transcoding
Video Station
  1. Show photos by thumbnails, list, timeline, or folder view
  2. Tag videos with text, color, and ratings
  3. Share video links to social websites or through email
  4. Display movie information and posters from Internet sources or user-uploaded files
  5. Supports displaying subtitles (*.SRT,*.ASS, *.SSA), online searching and downloading of subtitles as well as importing subtitle files
  6. Supports Facebook friends login
  7. Mobile app: Qvideo for online video browsing and management
OceanKTV
  1. Use the NAS as a karaoke machine.
  2. Display songs by artists, languages, and favorites.
  3. Enhance the experience with effects such as tuning echo, key, or applause
  4. Control the playlist with a mobile app.
  5. Supports keyboard and remote control (RM-RF001/ RM-IR002)
AirPlay & Chromecastk
  1. Streams videos, photos and music from NAS to Apple TV or Chromecast via File Station, Music Station, Photo Station, Video Station or mobile app (Qfile, Qmusic, Qphoto or Qvideo).
Note: The Media Streaming add-on app must be installed from the QTS App Center.
Qfinder Pro with Storage Plug & Connect
  1. Creating and mapping shared folders by QNAP Windows Qfinder Pro
  2. Creation of and connection to iSCSI target/LUN
Download Station
  1. PC-less BT, FTP/FTPS, and HTTP/HTTPS, Thunder, FlashGet and qqdl download (up to 500 Tasks)
  2. The maximum number of concurrent downloads: 90 (30 BT/PT, 30 HTTP, 30FTP downloads)
  3. BT download with search, Magnet Link and PT support
  4. Scheduled download and bandwidth control
  5. RSS subscription and download (broadcatching)
  6. Proxy support for BT download
  7. Mobile app: Qget for downloads browsing and Management
App Center
  1. Over 100 official and community software add-ons such as Q'center, Signage Station, Notes Station
Web Server
  1. HTTP/HTTPS Connections
  2. Supports WebDAV Connection
  3. Supports Virtual Host (Max: 32)
  4. Importable SSL Certificate
 

1 Not all IPv6 services are supported.
2 Data encryption functions may be unavailable in accordance with the legislative restrictions of some countries.
3 This feature may vary by model.
4 DRM-protected content is not supported.

Designs and specifications are subject to change without notice.
 
TS-251A Ethernet cable x 2 Quick installation guide (QIG)
65W AC Adapter: PWR-ADAPTER-65W-A01 Power cord x 1 Flat head screw x 8 (for 3.5" HDD)
 
Flat head screw x 6 (for 2.5” HDD) IR Remote Control: RM-IR002  

Optional Accessories

  1. FAN-7CM-T01
    FAN-7CM-T01
    PWR-ADAPTER-65W-A01
    PWR-ADAPTER-65W-A01 (EOL)
    RM-IR002
    RM-IR002 (EOL)
    SCR-HDD25A-96
    SCR-HDD25A-96
    SCR-HDD35B-96
    SCR-HDD35B-96
    SP-X20-TRAY
    SP-X20-TRAY
    RAM-1GDR3L-SO-1600
    RAM-1GDR3L-SO-1600 (EOL)
    RAM-2GDR3L-SO-1600
    RAM-2GDR3L-SO-1600 (EOL)
    RAM-2GDR3LK0-SO-1600
    RAM-2GDR3LK0-SO-1600 (EOL)
    RAM-2GDR3T0-SO-1600
    RAM-2GDR3T0-SO-1600 (EOL)
    RAM-4GDR3L-SO-1600
    RAM-4GDR3L-SO-1600
Bundled accessories delivered together with the product such as expansion cards, power adapter, and accessories are covered with one-year warranty.

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