QNAP Systems TS-251A-4G Network Storage Device

Hardware Specs

Ordering P/N

TS-251A-4G

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)

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 3.0 ports (Front: 1, Rear:2)

SD Card Reader

USB QuickAccess

(USB 3.0 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 slotsystem maintenance port

Dimension

169 x 102 x 219 mm

6.65 x 4.02 x 8.62 inch (HxWxD)

Weight

Net: 1.28 kg (2.82 lbs)

Gross: 2.64 kg (5.82 lbs)

Operating Temperature

0-40C

Relative Humidity

5~95% RH non-condensing, wet bulb: 27C

Noise Level

18.3 dB (A)

Refer to ISO 7779 ; Maximum HDD loaded ; Bystander Position ; Average data from 1 meter in front of operating NAS

Power Consumption

System sleep: 0.72W

HDD standby7.9W

In operation16.2W

(with 2 x 2TB HDDs)

Power

65W AC power adapter, 100-240V AC

Fan

1 x 7cm system fan (12V DC)

Software

Operating System

Network & Virtual Switch

QTS 4.2 (embedded Linux)

1. DHCP client, DHCP server

2. USB Wi-Fi Adapter Support

3. Virtual Switch

Supported Client OS

Access Right Management

1. Windows 7, Windows 8, Windows 10, Windows Server 2003/2008 R2/2012/2012R2

1. Batch users creation, import/export users

2. Apple Mac OS X, Linux & UNIX

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

Domain Authentication Integration

1. Microsoft Internet Explorer 10+ , Google Chrome, Apple Safari 7+, Mozilla Firefox

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

myQNAPcloud Service

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

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. CloudLink for remote access without any complicated router setup

7. myQNAPcloud connect for easy VPN connection (Windows VPN utility)

File System

Qsync

1. Internal Hard Drive: EXT4

1. Sync files across multiple devices with SSL secure connection

2. External Hard Drive: EXT3, EXT4, NTFS, FAT32, HFS+

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

Web Administration

1. TCP/IP (IPv4 & IPv6: Dual Stack)¹

1. Multi-window, multi-tasking based system management

2. Dual Gigabit NICs with jumbo frame (failover, multi-IP settings, port trunking/NIC teaming)

2. Dynamic DNS (DDNS)

3. Service binding based on network interfaces

3. SNMP (v2 & v3)

4. Squid Proxy server & Proxy client

4. Resource monitor

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

Security

Network recycle bin for file deletion via CIFS/SMB, AFP, and File Station

1. Network access protection with auto-blocking: SSH, Telnet, HTTP(S), FTP, CIFS/SMB, AFP

1. Comprehensive logs (events & connection)

2. CIFS host access control for shared folders

2. Syslog client/server

3. FIPS 140-2 validated AES 256-bit volume-based and shared folder data encryption ²

3. Mobile app: Qmanager for remote system monitoring & management

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

Storage Management

File Server

1. Storage Space Utilization monitoring

1. File sharing across Windows, Mac, and Linux/ UNIX

2. QNAP flexible Volume/LUN with thin provisioning and space reclaim³

2. Windows ACL

3. Disk volume types

3. Advanced folder permissions for CIFS/SMB, AFP, FTP

RAID 0,1, JBOD, single

4. Shared folder aggregation (CIFS/SMB)

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

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

HD (HybridDesk) Station

1. FTP over SSL/TLS (Explicit)

1. Watch various online contents

2. FXP support

2. Web browsers (Chrome, Firefox)

3. Supports international keyboards, input and mouse

4. Supports user login permissions

5. A variety of applications are available including Skype, Plex Home Theater, and more

6. Up to 7.1 channel audio passthrough is supported

Note: The playback and quality of some video files may be affected by the system's CPU and GPU decoding abilities.

File Station

Linux Station

1. Supports mounting cloud drives (such as Google Drive, Dropbox, Microsoft OneDrive, Amazon Drive, Yandex Disk and Box).

1. Use your NAS as a Ubuntu PC using the NAS HDMI output.

2. Supports mounting remote shared folders through FTP, WebDAV or Microsoft networking (SMB/CIFS)

2. Download and use a variety of applications from the Ubuntu Software Center.

3. Supports opening documents via Office Online, Google Docs or Chrome Extension (Edit Office files in Google Docs, Sheets, and Slides)

3. Supports remote desktop to monitor and access Ubuntu remotely.

4. Supports ISO Mounting (Up to 256 ISO Files)

4. An open source software platform for developers.

5. Drag-n-drop Files via Chrome and Firefox Browsers

Note: The NAS requires at least 4GB RAM and Container Station must be installed.

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

Transcode Management

Virtualization Station

1. Transcode video files to 240p, 360p, 480p, 720p and 1080p resolution

1. Supports Virtual Machine (VM) creation to run operating systems such as Windows, Linux, Unix and Android

2. Automatic video transcoding for watched folders

2. Supports VM import and export, cloning & snapshot, backup and restore

3. Hardware accelerated transcoding support

3. VM console can be displayed via HDMI output - QVM

4. Embed subtitles into videos for background Transcoding

4. HTML5-based shared remote console

5. Supports three different networking modes: Isolated, External-only and Bridged

Backup Station

Container Station

1. Remote replication server (over rsync)

1. Supports LXC and Docker

2. Real-time remote replication (RTRR) to another QNAP NAS, FTP or CIFS/SMB server

2. Download applications from the built-in Docker Hub Registry

3. Works as both RTRR server & client with bandwidth control

3. Supports one-click installation, container export/import & console mode

4. Real-time & scheduled backup

4. Supports two network modes (NAT and host)

5. Backup versioning for RTRR

5. Supports auto-start containers

6. Snapshot support for RTRR/Rsync

6. Supports downloading Docker certificates

7. Encryption, compression, file filter, and transfer rate limitation

7. Supports adding private registries

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.

Cloud Drive Sync

Qsirch

1. Multiple cloud account management like Google Drive, Dropbox, OneDrive, and hubiC

1. Supports full-text search in real-time

2. Supports multiple cloud accounts

2. Bar chart to show data distribution

3. Concurrent job execution and multi-threaded data transfer

3. Supports previews for photos, music, videos, Gmail, PDF .etc

4. Per-account bandwidth throttling

4. Show search results using thumbnails or a list

5. Supports search Chrome extension

Cloud Backup Station

iSCSI (IP SAN)

1. Amazon S3 Plus (including Amazon S3), Glacier

1. iSCSI target with multi-LUNs per target (Up to 256 targets/LUNs combined)

2. Google Cloud Storage

2. Supports LUN mapping & masking

3. WebDAV-based cloud storage

3. Online LUN capacity expansion

4. Microsoft Azure

4. Support for SPC-3 persistent reservation

5. OpenStack Swift

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

Surveillance Station

1. Max number of printers: 3

1. Supports over 3,000 IP cameras

2. Supports Internet Printing Protocol

2. Includes 2 free camera licenses, up to 32 camera channels by purchasing additional licenses

3. Print job display and management

3. Instant playback to check recent events

4. IP-based and domain name-based privilege Control

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

VPN Server

1. Show photos by thumbnails, list, timeline, or folder view

1. Secure remote access: PPTPL2TP/IPsec & OpenVPN VPN services

2. Tag photos with text, colors, and ratings

2. Max number of clients: 45 (15 clients for each protocol)

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

Music Station

VPN Client

1. Play or share music via web browser

1. Supported VPN protocols: PPTP and OpenVPN services

2. Supports changing album covers via Google search or by uploading photos.

2. PPTP Authentication: PAP, CHAP, MS-CHAP, MS-CHAPv2

3. Internet radio (MP3)

3. PPTP Encryption: None, AES 40/128 bit, AES 256 bit

4. Up to 8 music alarms

4. OpenVPN Encryption: None, AES 40/128 bit, AES 256 bit

5. Mobile app: Qmusic for music streaming and Management

5. Transmission package monitor

6. OpenVPN port control & link compression

iTunes Server

DLNA Server

1. Audio and video sharing for Windows & Mac iTunes

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

OceanKTV

1. Show photos by thumbnails, list, timeline, or folder view

1. Use the NAS as a karaoke machine.

2. Tag videos with text, color, and ratings

2. Display songs by artists, languages, and favorites.

3. Share video links to social websites or through email

3. Enhance the experience with effects such as tuning echo, key, or applause

4. Display movie information and posters from Internet sources or user-uploaded files

4. Control the playlist with a mobile app.

5. Supports displaying subtitles (*.SRT,*.ASS, *.SSA), online searching and downloading of subtitles as well as importing subtitle files

5. Supports keyboard and remote control (RM-RF001/ RM-IR002)

6. Supports Facebook friends login

7. Mobile app: Qvideo for online video browsing and management

AirPlay & Chromecastk

Qfinder Pro with Storage Plug & Connect

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).

1. Creating and mapping shared folders by QNAP Windows Qfinder Pro

Note: The Media Streaming add-on app must be installed from the QTS App Center.

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

Package Content

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

8-Bay Expansion Unit: UX-800P

5-Bay Expansion Unit: UX-500P

1GB DDR3L SODIMM RAM:RAM-1GDR3L-SO-1600

2GB DDR3L SODIMM RAM:
RAM-2GDR3L-SO-1600

4GB DDR3L SODIMM RAM:
RAM-4GDR3L-SO-1600

8GB DDR3L SODIMM RAM:
RAM-8GDR3L-SO-1600