QNAP TS-251+ User Manual

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Chapter 2. Power Button and Reset Button Behavior
 Power button: Press to turn on or turn off.
System
Power button
(Turn on)
Power button
(Hardware turn
off)
Power button
(Force turn off)
All models
Press once
1.5 sec
5 sec
 Reset button: Press to reset the system settings.
System
Basic system reset
(1 beep)
Advanced system reset
(2 beeps)
All models
3 sec
10 sec
Basic system reset (3 sec)
Press the reset button for 3 seconds, a beep sound will be heard. The following settings are
reset to default:
 System administration password: admin
 TCP/IP configuration: Obtain IP address settings automatically via DHCP
 TCP/IP configuration: Disable Jumbo Frame
 TCP/IP configuration: If port trunking is enabled (dual LAN models only), the port
trunking mode will be reset to “Active Backup (Failover)”.
 System Port: 8080 (system service port)
 Security Level: Low (Allow all connections)
 LCD panel password: (blank)*
 VLAN will be disabled
*This feature is only provided by the NAS models with LCD panels. Please visit
http://www.qnap.comfor details.
Advanced system reset (10 sec)
Press the reset button for 10 seconds; you will hear two beeps at the third and the tenth
seconds. The NAS will reset all the system settings to default as it does by web-based
system reset in “Administration” > “Restore to Factory Default” except all the data are
reserved. The settings such as the users, user groups, and the network share folders
previously created will be cleared. To retrieve the old data after the advanced system reset,
create the same network share folders on the NAS and the data will be accessible again.

QNAP TS-251+ Specifications

General

Type	NAS
Buzzer	Yes
Noise level	15.4 dB
Device class	Home & Home Office
Share folder	512
Backup features	Cloud, USB drive, iSCSI LUN
Browser supported	Apple Safari 7+, Google Chrome, Microsoft Internet Explorer 10+, Mozilla Firefox
Security algorithms	256-bit AES, FIPS 140-2, HTTPS, SSH
Processor cores	4
Processor model	-
Processor family	Intel® Celeron®
Processor frequency	2 GHz
Fan voltage	12 V
AC input voltage	100 - 240 V
Power supply location	External
Power consumption (sleep)	0.57 W
Power consumption (typical)	18.09 W
Power consumption (HDD standby)	10.56 W
Power supply unit (PSU) capacity	60 W
Flash memory	512 MB
Memory slots	2x SODIMM
Internal memory	- GB
Memory clock speed	1600 MHz
Internal memory type	DDR3L
Maximum RAM supported	8 GB
Wi-Fi	No
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Supported network protocols	CIFS/SMB, AFP v3.3, NFS v3, FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, SMSC
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	5 - 95 %
Chassis type	Tower
Cooling type	Active
Fan diameter	70 mm
Product color	Black
LED indicators	HDD, LAN, Power, Status, USB
Number of fans	1 fan(s)
Cable lock slot type	Kensington
Operating system version	4.3
Operating system installed	QNAP Turbo System
Mac operating systems supported	Mac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Mavericks
Server operating systems supported	Windows Server 2003, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016
Windows operating systems supported	Windows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 IOT Core, Windows 10 Pro, Windows 10 Pro x64, Windows 7, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 Home Premium, Windows 7 Home Premium x64, Windows 7 Professional, Windows 7 Professional x64, Windows 7 Starter, Windows 7 Starter x64, Windows 7 Ultimate, Windows 7 Ultimate x64, Windows 7 x64, Windows 8, Windows 8 Enterprise, Windows 8 Enterprise x64, Windows 8 Pro, Windows 8 Pro x64, Windows 8 x64
RAID levels	0, 1, JBOD
Storage drive size	- \
Storage drive capacity	4000 GB
Supported file systems	FAT32, HFS+, NTFS, exFAT, ext3, ext4
Installed storage drive type	HDD
Storage drive sizes supported	2.5, 3.5 \
Supported storage drive types	HDD & SSD
Total installed storage capacity	8 TB
Number of storage drives supported	2
Supported storage drive interfaces	Serial ATA II, Serial ATA III
Cables included	AC, LAN (RJ-45)
Number of screws	14
Fiber ports quantity	0
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Number of simultaneous users	4096 user(s)

Weight and Dimensions

Depth	219 mm
Width	102 mm
Height	169 mm
Weight	1280 g
Package weight	2320 g