QNAP HS-251 Instructions for use

2015/01/14
QNAP Turbo NAS
Hardware User Manual
© 2015. QNAP Systems, Inc. All Rights Reserved.

2
Thank you for choosing QNAP products! This user manual provides description of the
hardware of the Turbo NAS and relevant guideline of certain functions. Please read carefully
and strictly adhere to the instructions of the manual.
This user manual is applicable to the following Turbo NAS models:
HS-210, HS-251, TS-112P, TS-131, TS-212P, TS-231, TS-231+,TS-251, TS-251C, TS-253
Pro, TS-269H, TS-420U, TS-421U, TS-431, TS-431+, TS-451, TS-451S, TS-451U, TS-453
Pro, TS-453S Pro (formerly SS-453 Pro), TS-453U, TS-453U-RP, TVS-463, TS-470U-SP/RP,
TS-651, TS-653 Pro, TVS-663, TS-851, TS-853 Pro, TS-853S Pro (formerly SS-853 Pro),
TS-853U, TS-853U-RP, TVS-863, TVS-863+, TS-870U-RP, TS-879 Pro, TS-879U-RP,
TS-EC879U-RP, TS-1079 Pro, TS-1253U, TS-1253U-RP, TS-1270U-RP, TS-1279U-RP,
TS-EC1279U-RP, TS-1679U-RP, TS-EC1679U-RP, IS-400 Pro
NOTE
The “Turbo NAS” & “Turbo vNAS” are hereafter referred to as “NAS”.
The product you purchased may not support certain functions dedicated to specific
models.
All features, functionality, and other product specifications are subject to change
without prior notice or obligation.
Information presented is subject to change without notice.
No part of this publication may be reproduced, stored in a retrieval system, or
transmitted, in any form or by any means, mechanical, electronic, photocopying,
recording, or otherwise, without prior written permission of QNAP Systems, Inc.
QNAP and the QNAP logo are registered trademarks of QNAP Systems, Inc. Other
products and company names mentioned herein may be the trademarks of their
respective companies.

3
DISCLAIMER
In no event shall QNAP Systems, Inc. (QNAP) liability exceed the price paid for the product
from direct, indirect, special, incidental, or consequential damages resulting from the use
of the product, its accompanying software, or its documentation. QNAP makes no warranty
or representation, expressed, implied, or statutory, with respect to its products or the
contents or use of this documentation and all accompanying software, and specifically
disclaims its quality, performance, merchantability, or fitness for any particular purpose.
QNAP reserves the right to revise or update its products, software, or documentation
without obligation to notify any individual or entity.
Note:
Back up your system periodically to avoid any potential data loss. QNAP disclaims any
responsibility of all sorts of data loss or recovery.
Should you return any components of the NAS package for refund or maintenance,
make sure they are carefully packed for shipping. Any form of damages due to
improper packaging will not be compensated.

4
Regulatory Notice
FCC Notice
QNAP NAS comply with different FCC compliance classes. Please refer the Appendix for
details. Once the class of the device is determined, refer to the following corresponding
statement.
=======================================================
FCC Class A Notice
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may
cause undesired operation.
Note: This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency
energy, and if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference, in which case the user will be required to
correct the interference at his own expense.
Modifications: Any modifications made to this device that are not approved by QNAP
Systems, Inc. may void the authority granted to the user by the FCC to operate this
equipment.

5
FCC Class B Notice
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may
cause undesired operation.
Note: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
•Consult the dealer or an experienced radio/television technician for help.
Modifications: Any modifications made to this device that are not approved by QNAP
Systems, Inc. may void the authority granted to the user by the FCC to operate this
equipment.
CE NOTICE
QNAP NAS comply with different CE compliance classes. Please refer to the Appendix for
details.