QNAP TS-251+ User Manual

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Chapter 4. LED and Alarm Buzzer Specifications
The LED indicators of the NAS indicate the system status and information. When the NAS is
turned on, check the following items to make sure the system status is normal. Note that
the following LED information is applicable only when users have properly installed the hard
drive, and connected the NAS to the network and the power supply.
LED
Color
LED Status
Description
System
Status
Red/
Green
Flashes green
and red
alternately
every 0.5 sec
1. The hard drive on the NAS is being
formatted.
2. The NAS is being initialized.
3. The system firmware is being updated.
4. RAID rebuilding is in process.
5. Online RAID Capacity Expansion is in
process.
6. Online RAID Level Migration is in process.
Red
1. The hard drive is invalid.
2. The disk volume has reached its full
capacity.
3. The disk volume is going to be full.
4. The system fan is out of function.
5. An error occurs when accessing
(read/write) the disk data.
6. A bad sector is detected on the hard
drive.
7. The NAS is in degraded read-only mode
(2 member drives fail in a RAID 5 or RAID
6 configuration, the disk data can still be
read).
8. Hardware self-test error.
Flashes red
every 0.5 sec
The NAS is in degraded mode (one member
drive fails in RAID 1, RAID 5 or RAID 6
configuration).
Flashes green
every 0.5 sec
1. The NAS is starting up.
2. The NAS is not configured.
3. A hard disk drive is not formatted.
Flashes green
every 2
seconds
The NAS is in S3 sleep mode
1
.
Green
The NAS is ready.
Off
All the hard disk drives on the NAS are in
standby mode.
1
This feature is only available on certain NAS models. Please refer to the product specification table
for details at www.qnap.com.

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