Advantech MIO-2260 User manual

User Manual
MIO-2260
MI/O-Ultra SBC with Intel®
Atom™ N455, DDR3, 18-bit
LVDS, VGA, GbE, Mini PCIe, 2
COM, 2 USB, MIOe

MIO-2260 User Manual ii
Copyright
The documentation and the software included with this product are copyrighted 2011
by Advantech Co., Ltd. All rights are reserved. Advantech Co., Ltd. reserves the right
to make improvements in the products described in this manual at any time without
notice.
No part of this manual may be reproduced, copied, translated or transmitted in any
form or by any means without the prior written permission of Advantech Co., Ltd.
Information provided in this manual is intended to be accurate and reliable. However,
Advantech Co., Ltd. assumes no responsibility for its use, nor for any infringements
of the rights of third parties, which may result from its use.
Acknowledgements
AMI is a trademark of AMI Software International, Inc.
Intel® is a trademark of Intel® Technologies, Inc.
IBM, PC/AT, PS/2 and VGA are trademarks of International Business Machines Cor-
poration.
Intel and Atom® are trademarks of Intel Corporation.
Microsoft Windows® is a registered trademark of Microsoft Corp.
RTL is a trademark of Realtek Semi-Conductor Co., Ltd.
ESS is a trademark of ESS Technology, Inc.
UMC is a trademark of United Microelectronics Corporation.
SMI is a trademark of Silicon Motion, Inc.
Creative is a trademark of Creative Technology LTD.
All other product names or trademarks are properties of their respective owners.
Part No. 2006226010 Edition 1
Printed in China November 2011

iii MIO-2260 User Manual
Product Warranty (2 years)
Advantech warrants to you, the original purchaser, that each of its products will be
free from defects in materials and workmanship for two years from the date of pur-
chase.
This warranty does not apply to any products which have been repaired or altered by
persons other than repair personnel authorized by Advantech, or which have been
subject to misuse, abuse, accident or improper installation. Advantech assumes no
liability under the terms of this warranty as a consequence of such events.
Because of Advantech’s high quality-control standards and rigorous testing, most of
our customers never need to use our repair service. If an Advantech product is defec-
tive, it will be repaired or replaced at no charge during the warranty period. For out-
of-warranty repairs, you will be billed according to the cost of replacement materials,
service time and freight. Please consult your dealer for more details.
If you think you have a defective product, follow these steps:
1. Collect all the information about the problem encountered. (For example, CPU
speed, Advantech products used, other hardware and software used, etc.) Note
anything abnormal and list any onscreen messages you get when the problem
occurs.
2. Call your dealer and describe the problem. Please have your manual, product,
and any helpful information readily available.
3. If your product is diagnosed as defective, obtain an RMA (return merchandize
authorization) number from your dealer. This allows us to process your return
more quickly.
4. Carefully pack the defective product, a fully-completed Repair and Replacement
Order Card and a photocopy proof of purchase date (such as your sales receipt)
in a shippable container. A product returned without proof of the purchase date
is not eligible for warranty service.
5. Write the RMA number visibly on the outside of the package and ship it prepaid
to your dealer.
Technical Support and Assistance
1. Visit the Advantech web site at www.advantech.com/support where you can find
the latest information about the product.
2. Contact your distributor, sales representative, or Advantech's customer service
center for technical support if you need additional assistance. Please have the
following information ready before you call:
–Product name and serial number
–Description of your peripheral attachments
–Description of your software (operating system, version, application software,
etc.)
–A complete description of the problem
–The exact wording of any error messages

MIO-2260 User Manual iv
Packing List
Before installation, please ensure the following items have been shipped:
Item Part Number
1 MIO-2260 SBC
1 Startup manual
1 Utility CD
Cables
Heatsink:
Stud & Screw
Ordering information
Model Number Description
Optional accessories
Part No. Description
1960053176N001 Heat Spreader (99.5 x 70.5 x 11.2 mm)
Part Number Description
1700006291 SATA cable 7P 30 cm w/ right angle
1700019156 Audio Cable 2*5P-2.0/JACK*2 20cm
1701200220 COM PORT cable 2*10P-2.0/D-SUB 9P(M)*2 22 cm
1700019656 SATA Power cable 5P-1.25/5P-2.0+SATA 5P 15 cm
1960053175T001 99.5x70.5x15.7mm
Part Number Description
1910002088 Stud F=M3*10L M=M3*5L B=5 H=16, 4pcs
1935032000 Screw R/S 5.5 2.0 +M M3*20L, 4pcs
193B0204C0 Screw F/S D=3.5 H=0.8 + M2*4L, 1pcs
MIO-2260NF-S6A1E Atom N455, fanless, 12V, VGA, LVDS, GbE, 2 USB, MIOe

v MIO-2260 User Manual
Certification and Safety Instructions
This device complies with the requirements in part 15 of the FCC rules: Operation is
subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that
may cause undesired operation
This equipment has been tested and found to comply with the limits for a Class A dig-
ital device, pursuant to Part 15 of the FCC Rules. These limits are designed to pro-
vide 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. Opera-
tion of this device in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his/her own expense. The
user is advised that any equipment changes or modifications not expressly approved
by the party responsible for compliance would void the compliance to FCC regula-
tions and therefore, the user's authority to operate the equipment.
Caution! There is a danger of a new battery exploding if it is incorrectly installed.
Do not attempt to recharge, force open, or heat the battery. Replace the
battery only with the same or equivalent type recommended by the man-
ufacturer. Discard used batteries according to the manufacturer's
instructions.

MIO-2260 User Manual vi

vii MIO-2260 User Manual
Contents
Chapter 1 General Introduction ...........................1
1.1 Introduction ...............................................................................................2
1.2 Product Feature ........................................................................................2
1.3 Specifications............................................................................................3
1.3.1 Functional Specification................................................................3
1.3.2 Mechanical Specifications.............................................................4
1.3.3 Electrical Specifications................................................................5
1.4 Environmental Specifications....................................................................5
1.4.1 Operating Humidity.......................................................................5
1.4.2 Operating Temperature.................................................................5
1.4.3 Storage Humidity ..........................................................................5
1.4.4 Storage Temperature....................................................................5
Chapter 2 H/W Installation....................................7
2.1 Jumpers ....................................................................................................8
2.1.1 Jumper Description.......................................................................8
2.1.2 Jumper list.....................................................................................8
Table 2.1: Jumper List.................................................................8
2.1.3 Jumper Settings............................................................................8
Table 2.2: J1: LCD Power/Auto Power on...................................8
2.2 Connectors................................................................................................9
2.2.1 Connector list................................................................................9
Table 2.3: Connector list..............................................................9
2.2.2 Connector Settings .......................................................................9
2.3 Mechanical..............................................................................................12
2.3.1 Jumper and Connector Locations...............................................12
Figure 2.1 Jumper and Connector layout (Top side).................12
Figure 2.2 Jumper and connector layout (Bottom side).............13
2.3.2 Board Dimensions.......................................................................13
Figure 2.3 Board dimension layout (Top side)...........................13
Figure 2.4 Board dimension layout (Bottom side)......................14
Figure 2.5 Board dimension layout (Coastline with power connec-
tor)............................................................................14
Figure 2.6 Board dimension layout (Coastline with optional DC/
Jack).........................................................................15
Figure 2.7 MI/O Module height constraint..................................15
Figure 2.8 Illustration of heat spreader assembly.....................16
Chapter 3 BIOS settings.....................................17
Figure 3.1 Setup program initial screen.....................................18
3.1 Entering Setup ........................................................................................18
3.2 Main Setup..............................................................................................19
Figure 3.2 Main setup screen ....................................................19
3.2.1 System time / System date.........................................................19
3.3 Advanced BIOS Features Setup.............................................................20
Figure 3.3 Advanced BIOS features setup screen ....................20
3.3.1 CPU Configuration......................................................................21
Figure 3.4 CPU Configuration Setting .......................................21
3.3.2 IDE Configuration........................................................................22
Figure 3.5 IDE Configuration.....................................................22
3.3.3 Super I/O Configuration..............................................................23

MIO-2260 User Manual viii
Figure 3.6 Super I/O Configuration............................................ 23
3.3.4 Hardware Health Configuration .................................................. 24
Figure 3.7 Hardware health configuration ................................. 24
3.3.5 ACPI Settings ............................................................................. 25
Figure 3.8 ACPI Settings........................................................... 25
Figure 3.9 General ACPI Configuration..................................... 25
Figure 3.10Advanced ACPI Configuration.................................. 26
Figure 3.11Chipset ACPI Configuration ..................................... 27
3.3.6 AHCI Configuration..................................................................... 28
Figure 3.12Advanced ACPI Configuration.................................. 28
3.3.7 APM Configuration...................................................................... 28
Figure 3.13APM Configuration ................................................... 28
3.3.8 Event Log Configuration............................................................. 29
Figure 3.14South Bridge ACPI Configuration............................. 29
3.3.9 MPS Configuration...................................................................... 30
Figure 3.15MPS Configuration................................................... 30
3.3.10 Smbios Configuration ................................................................. 30
Figure 3.16Smbios Configuration............................................... 30
3.3.11 USB Configuration...................................................................... 31
Figure 3.17USB Configuration.................................................... 31
Figure 3.18USB Mass storage Device Configuration................. 32
3.4 Advanced PCI/PnP Settings ................................................................... 33
Figure 3.19PCI/PNP Setup (top)................................................ 33
3.5 Boot Settings........................................................................................... 34
Figure 3.20Boot Setup Utility...................................................... 34
3.5.1 Boot settings Configuration......................................................... 35
Figure 3.21Boot Setting Configuration ....................................... 35
3.6 Security Setup......................................................................................... 36
Figure 3.22Password Configuration........................................... 36
3.7 Advanced Chipset Settings..................................................................... 37
Figure 3.23Advanced Chipset Settings ...................................... 37
3.7.1 North Bridge Chipset Configuration............................................ 37
Figure 3.24North Bridge Configuration....................................... 37
Figure 3.25Video function configuration..................................... 38
3.7.2 South Bridge Chipset Configuration ........................................... 39
Figure 3.26South Bridge Configuration ...................................... 39
3.8 Exit Option .............................................................................................. 40
Figure 3.27Exit Option................................................................ 40
3.8.1 Save Changes and Exit.............................................................. 40
3.8.2 Discard Changes and Exit.......................................................... 40
3.8.3 Load Optimal Defaults................................................................ 40
3.8.4 Load Fail-Safe Defaults.............................................................. 41
Chapter 4 S/W Introduction & Installation........43
4.1 S/W Introduction ..................................................................................... 44
4.2 Driver Installation .................................................................................... 44
4.2.1 Windows XP Professional........................................................... 44
4.2.2 Other OS..................................................................................... 44
4.3 Value-Added Software Services ............................................................. 44
4.3.1 SUSI Introduction........................................................................ 44
4.3.2 Software APIs............................................................................. 45
4.3.3 SUSI Utilities............................................................................... 46
4.3.4 SUSI Installation......................................................................... 47
4.3.5 SUSI Sample Programs.............................................................. 48
Appendix A PIN Assignments ..............................55
A.1 Jumper Setting........................................................................................ 56

ix MIO-2260 User Manual
Table A.1: Jumper List...............................................................56
A.2 Connectors..............................................................................................56
Table A.2: Connector list............................................................56
Table A.3: J1: LCD Power/Auto Power on.................................56
Table A.4: CN1: SMBus.............................................................57
Table A.5: CN2: COM1/COM2...................................................57
Table A.6: CN3: 18 bits LVDS Panel .........................................58
Table A.7: CN4: SODIMMDDR3_204........................................58
Table A.8: CN5: Audio...............................................................59
Table A.9: CN6: Inverter Power Output.....................................59
Table A.10:CN7: GPIO ...............................................................60
Table A.11:CN8: Front Panel......................................................60
Table A.12:CN9: Mini PCIE ........................................................61
Table A.13:CN10: MIO 3.0..........................................................62
Table A.14:CN11: CF..................................................................65
Table A.15:CN12: SATA.............................................................66
Table A.16:CN13: LAN ...............................................................67
Table A.17:CN14: External USB.................................................67
Table A.18:CN15: 12V Power Input............................................68
Table A.19:CN17: VGA...............................................................68
Appendix B WDT & GPIO.......................................69
B.1 Watchdog Timer Sample Code...............................................................70
Appendix C System Assignments ........................73
C.1 System I/O Ports.....................................................................................74
Table C.1: System I/O Ports ......................................................74
C.2 1st MB Memory Map...............................................................................74
Table C.2: 1st MB memory map ................................................74
C.3 DMA Channel Assignments ....................................................................74
Table C.3: DMA channel assignments.......................................74
C.4 Interrupt Assignments .............................................................................75
Table C.4: Interrupt assignments...............................................75

MIO-2260 User Manual x

Chapter 1
1General Introduction
This chapter gives background
information on the MIO-2260.
Sections include:
Introduction
Product feature
Specifications

MIO-2260 User Manual 2
1.1 Introduction
MIO-2260 is a MI/O-Ultra SBC (Single Board Computer) with Embedded Intel®
Atom™ N455 1.66 GHz Processor. The MIO-2260 can support DDR3 memory up to
2 GB, has two USB 2.0 compatible ports, one GbE (1000Mbps) interface, LVDS and
VGA support, HD (High Definition) audio, and one H/S mini-PCIe and MIOe expan-
sion slot. In addition, MIO-2260 also supports one SATA drive, two COM ports and
one CF slot.
Advantech's innovative MI/O (multiple I/O) Extension SBC equipped flexible multiple
I/O, efficiency on schedule, development resources & assist integrators to provide
optimized solutions in cost-effective way by connecting with MIOe high speed sock-
ets. The design of MI/O Extension took into account of soft-/hard-/firmware applica-
tions.
1.2 Product Feature
General
CPU: Intel® Atom™ processor N455 1.66 GHz
System Chipset Intel® Atom™ N455 + ICH8M
BIOS: SPI 16 Mbit Flash BIOS
System Memory: DDR3 667 MHz N455 up to 2 GB
CFC: Supports CompactFlash® Card TYPE II
Watchdog Timer: Single chip Watchdog 255-level interval timer, setup by soft-
ware
Expansion Interface: Supports 1 x H/S mini-PCIe and MIOe slot device
Battery: Lithium 3 V/210 mAH
I/O
I/O Interface: 1 x SATA (300 MB/S), 2 x RS232
USB: 2 x USB 2.0 compliant Ports
Audio: High Definition Audio (HD), Line-in, Line out
GPIO: 8-bit general purpose input/output (5V tolerance)
Ethernet
Controller: ICH8M(MAC), Intel 82566V(PHY)
Speed: 1000 Mbps
Interface: 1 x RJ45
Standard: Compliant with IEEE 802.3, IEEE 802.3u, IEEE 802.ab.
Display
Controller: Intel N455, Gen3.5 DX9
Memory Size: Up to 224 MB of dynamic video memory allocation
Resolution:
–VGA: Up to 1400 x 1050 (SXGA)
–LVDS: Single channel 18-bit LVDS up to WXGA 1366 x 768

3 MIO-2260 User Manual
Chapter 1 General Introduction
1.3 Specifications
1.3.1 Functional Specification
Processor
Chipset (Intel® N455)
Chipset (ICH8M)
Processor
Intel® Atom™ Processor N455
Intel® Atom™ N455 at 1.66 GHz with 512KB L2 cache
Manufacturing Technology:45 nm
Memory
Intel® N455
Supports DDR3 667 MHz up to 2 GB
SODIMM Socket: 204-pin SODIMM socket type *1
Graphic and Video
Controllers
Intel 3.5 Gen Integrated Graphic Engine + GFX core
DVMT 4.0 (Dynamic Video Memory Technology)
Directx9 compliant Pixel Shader 2.0
2 display ports: LVDS and VGA
Intel® Clear Video Technology
IDE Interface ICH8M
Supports one CF device
H.D. Codec ALC892 I/F
ICH8M supports:
Support for HD codec
Up to 2 channel of PCM (Pulse Code Modulation) audio out-
put
Connectors: Line-out, Line-in: Pin header 2*5P (M) 2.0 mm
Concurrent PCI/PCIe
Bus Controller
ICH8M chip supports:
PCI 2.3
Support one H/S mini-PCIe connector
SATA Connector
ICH8M supports:
Independent DMA operation on two ports
Data transfer rates of up to 3.0 Gb/s (300 MB/s)
Operation of AHCI using memory space
Several optional sections of the Serial ATA II
Connector: Serial ATA II 7 pins 1.27 mm
USB Interface
ICH8M supports:
2 USB 2.0 ports which are high-speed, full- speed, and low-
speed capable
Connector: 2 set rear I/O at coastline
Power Management Full ACPI (Advanced Configuration and Power Interface) 3.0
Supports S1, S3,S4, S5
BIOS SPI 16Mb Flash BIOS

MIO-2260 User Manual 4
Others
1.3.2 Mechanical Specifications
1.3.2.1 Dimensions (mm)
L100.00 mm * W72 mm
1.3.2.2 Height on top (mm)
15.7mm (heatsink)
1.3.2.3 Height under bottom (mm)
16.1mm (USB connector)
1.3.2.4 Weight (g)
42g (including of heatsink)
Graphic and Video
Controllers
Intel N455, Gen3.5 DX9
VGA: Up to 1400 x 1050 (SXGA)
LVDS: Single channel 18-bit LVDS up to WXGA 1366 x 768
LVDS connector: 14pin wafer box 1.25mm
CRT connector: D-SUB15 at coastline
Ethernet
ICH8M + Intel 82567V (PHY)
Compliant with IEEE 802.3, IEEE 802.3u, IEEE 802.ab.
Support 1000Mbps.
Connectors: Phone Jack RJ45 8P 90D(F)
Serial ports
SMSC SCH 3114 support
2 RS-232 serial ports with ESD protection : air gap ± 15kV,
contact ± 8kV
High Speed NS16C550A Compatible UARTs with Data rates
to 1.5Mbps.
Support IRQ Sharing among serial ports.
Connectors:
COM1/2: 1x 2.0mm 10*2P pin header
GPIO
SMSC SCH 3114 support
8 I/O Pins.
5V tolerance I/Os.
Connectors:
5*2 pins 2.0mm pin header.
Battery backup 2 pin wafer box for external Battery on board

5 MIO-2260 User Manual
Chapter 1 General Introduction
1.3.3 Electrical Specifications
1.3.3.1 Power supply Voltage
single 12V input 10%
1.3.3.2 Power Supply Current (with 1 GB memory)
Typical in XP mode:
0.64 A, 12 V
Max in HCT:
0.86 A, 12 V
1.3.3.3 RTC Battery
Typical Voltage: 3.0 V
Normal discharge capacity: 210 mAh
1.4 Environmental Specifications
1.4.1 Operating Humidity
40 °C @ 95% RH Non-Condensing
1.4.2 Operating Temperature
0 ~ 60 °C (32~140 °F)
1.4.3 Storage Humidity
60 °C @ 95% RH Non-Condensing
1.4.4 Storage Temperature
-40 ~ 85 °C (-40 ~ 185 °F)

MIO-2260 User Manual 6

Chapter 2
2H/W Installation
This chapter explains the setup
procedures of the MIO-2260 hard-
ware, including instructions on
setting jumpers and connecting
peripherals, as well as switches,
indicators and mechanical draw-
ings. Be sure to read all safety
precautions before you begin the
installation procedure.

MIO-2260 User Manual 8
2.1 Jumpers
2.1.1 Jumper Description
Cards can be configured by setting jumpers. A jumper is a metal bridge used to close
an electric circuit. It consists of two metal pins and a small metal clip (often protected
by a plastic cover) that slides over the pins to connect them. To close a jumper, you
connect the pins with the clip. To open a jumper, you remove the clip. Sometimes a
jumper will have three pins, labeled 1, 2 and 3. In this case you would connect either
pins 1 and 2, or 2 and 3.
The jumper settings are schematically depicted in this manual as follows.
A pair of needle-nose pliers may be helpful when working with jumpers. If you have
any doubts about the best hardware configuration for your application, contact your
local distributor or sales representative before you make any changes.
Generally, you simply need a standard cable to make most connections.
2.1.2 Jumper list
2.1.3 Jumper Settings
Warning! To avoid damaging the computer, always turn off the power supply
before setting jumpers.
Table 2.1: Jumper List
J1 LCD Power / Auto Power on
Table 2.2: J1: LCD Power/Auto Power on
Part Number 1653003260
Footprint HD_3x2P_79
Description PIN HEADER 3*2P 180D(M) 2.0mm SMD SOUARE PIN
Setting Function
(1-2) +5V
(3-4) (default) +3.3V
(5-6) (default) Auto Power On

9 MIO-2260 User Manual
Chapter 2 H/W Installation
2.2 Connectors
2.2.1 Connector list
2.2.2 Connector Settings
2.2.2.1 Battery Connector (BH1)
MIO-2260 supports Lithium 3 V/210mAH CR2032 battery with wire via battery con-
nector (BH1).
2.2.2.2 SMBus Connector (CN1)
MIO-2260 provides SMBus connector for customer connection to SMBus protocol
embedded device. It can be configured to I2C by T-p/n support.
Advantech also provide SMBus API allowing developer to interface with an embed-
ded system environment and transfer serial messages using the SMBus protocols,
allowing multiple simultaneous device control.
2.2.2.3 COM Port Connector (CN2)
The MIO-2260 provides 2 RS-232 serial ports in 10*2pin pin header. You can find the
pin assignments for the COM port connector in Appendix A.
Table 2.3: Connector list
CN1 SMBus
CN2 COM1/COM2
CN3 18 bits LVDS Panel
CN4 SODIMM DDR3
CN5 Audio
CN6 Inverter Power Output
CN7 GPIO
CN8 Front Panel
CN9 Mini-PCIe
CN10 MIOe
CN11 CF
CN12 SATA
CN13 GbE
CN14 External USB
CN15 12V Power Input
CN17 VGA
Note! How to clear CMOS: (Must follow below steps)
1. Turn off system power
2. Unplug CR2032 battery cable on BH1
3. Waiting for 15sec or short BH1 pin1-2
4. Connect battery cable on BH1
5. Turn on system power

MIO-2260 User Manual 10
2.2.2.4 VGA/LVDS Interface Connections
The board's VGA interface can drive conventional CRT displays and is capable of
driving a wide range of flat panel displays, including passive LCD and active LCD dis-
plays. The board has connectors to support these displays: one for standard CRT
VGA monitors and one for flat panel displays
CRT display connector (CN17)
The CRT display connector is a rear I/O connector as coastline used for conventional
CRT displays. Resolution : up to 1400 x 1050 (SXGA)
LVDS LCD panel connector (CN3)
The board supports single channel 18-bit LVDS LCD panel displays via 14*1pin
wafer box. Resolution : up to 1366 x 768 (WXGA).
2.2.2.5 DDRIII SODIMM Socket (CN4)
One 204-pin/H9.2 mm DDRIII DIMM socket supports DDRIII 667 MHz up to 2 GB.
2.2.2.6 Audio Interface (CN5)
Audio Port Connectors
One 5 x 2 pin box header for Audio connector. These audio connectors are used for
audio devices.
2.2.2.7 Inverter Power/Internal SATA PowerConnector (CN6)
MIO-2260 can provide +5 V/+12 V/signal to LCD inverter board and 5V for 2.5" SATA
HDD via CN6.
SATA power's current is only sufficient for 2.5" HDD, and LVDS inverter's current is 5
V @ less than 1 A, 12 V @ 500 mA.
2.2.2.8 GPIO (General Purpose Input Output) (CN7)
The board supports 8-bit GPIO (5V tolerance) through GPIO connector. The 8 digital
in and out-puts can be programmed to read or control devices, with input or out- put
defined. The default setting is 4 bits input and 4 bits output.
2.2.2.9 Front Panel (CN8)
MIO-2260 integrates below functions as front panel 6pin connector :
Power button
MIO-2260 supports power on/off button in ATX mode.
Reset
If you install a reset switch, it should be an open single pole switch.
Momentarily pressing the switch will activate a reset.
Power LED
Power LED indicator would light when power is on.
HDD LED
HDD LED indicator for hard disk access is an active low signal
2.2.2.10 Mini PCIe Connector (CN9)
PCI Express Mini Card (also known as Mini PCI Express, Mini PCIe, and Mini PCI-E)
is a replacement for the Mini PCI form factor based on PCI Express. It is developed
by the PCI-SIG. The host device supports both PCI Express and USB 2.0 connectiv-
ity, and each card uses whichever the designer feels most appropriate to the task.
MIO-2260 support a Mini PCIe slot.