Asus P4P800: инструкция

P4P800

User Guide

Motherboard

E1324

Revised Edition V2

May 2003

Copyright © 2003 ASUSTeK COMPUTER INC. All Rights Reserved.

No part of this manual, including the products and software described in it, may be

reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any

language in any form or by any means, except documentation kept by the purchaser for

backup purposes, without the express written permission of ASUSTeK COMPUTER INC.

(“ASUS”).

Product warranty or service will not be extended if: (1) the product is repaired, modified or

altered, unless such repair, modification of alteration is authorized in writing by ASUS; or (2)

the serial number of the product is defaced or missing.

ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER

EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES

OR CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

IN NO EVENT SHALL ASUS, ITS DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE

LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES

(INCLUDING DAMAGES FOR LOSS OF PROFITS, LOSS OF BUSINESS, LOSS OF USE

OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE), EVEN IF ASUS HAS BEEN

ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY DEFECT OR

ERROR IN THIS MANUAL OR PRODUCT.

SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED

FOR INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME

WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS.

ASUS ASSUMES NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR

INACCURACIES THAT MAY APPEAR IN THIS MANUAL, INCLUDING THE PRODUCTS

AND SOFTWARE DESCRIBED IN IT.

Products and corporate names appearing in this manual may or may not be registered

trademarks or copyrights of their respective companies, and are used only for identification or

explanation and to the owners’ benefit, without intent to infringe.

ii

Contents

FCC/CDC statements.....................................................................vi

Safety information ......................................................................... vii

About this guide............................................................................ viii

How this guide is organized ................................................ viii

Conventions used in this guide .............................................ix

Where to find more information .............................................ix

ASUS contact information ...............................................................x

P4P800 specifications summary .................................................... xi

Chapter 1: Product introduction

1.1 Welcome! ........................................................................... 1-1

1.2 Package contents............................................................... 1-1

1.3 Special features.................................................................. 1-2

1.3.1 Product highlights .................................................. 1-2

1.3.2 Value-added solutions............................................ 1-6

1.4 Motherboard overview........................................................ 1-7

1.4.1 Major components ................................................. 1-7

1.4.2 Core specifications ................................................ 1-9

Chapter 2: Hardware information

2.1 Motherboard installation ..................................................... 2-1

2.1.1 Placement direction ............................................... 2-1

2.1.2 Screw holes ........................................................... 2-1

2.2 Motherboard layout ............................................................ 2-2

2.3 Before you proceed ............................................................ 2-3

2.4 Central Processing Unit (CPU)........................................... 2-4

2.4.1 Overview ................................................................ 2-4

2.4.2 Installing the CPU .................................................. 2-5

2.4.3 Installing the heatsink and fan ............................... 2-7

2.4.4 Connecting the CPU fan cable .............................. 2-9

2.5 System memory ............................................................... 2-10

2.5.1 Overview .............................................................. 2-10

2.5.2 Memory configurations .........................................2-11

2.5.3 Installing a DIMM ................................................. 2-14

2.5.4 Removing a DIMM ............................................... 2-14

2.6 Expansion slots ................................................................ 2-15

2.6.1 Installing an expansion card ................................ 2-15

2.6.2 Configuring an expansion card ............................ 2-15

2.6.3 PCI slots .............................................................. 2-17

2.6.4 AGP slot............................................................... 2-18

2.6.5 WiFi slot ............................................................... 2-19

2.7 Jumpers............................................................................ 2-20

2.8 Connectors ....................................................................... 2-23

iii

Contents

Chapter 3: Powering up

3.1 Starting up for the first time ................................................ 3-1

3.2 Powering off the computer ................................................. 3-2

Chapter 4: BIOS setup

4.1 Managing and updating your BIOS .................................... 4-1

4.1.1 Creating a bootable floppy disk ............................. 4-1

4.1.2 Using AFUDOS to update the BIOS ...................... 4-1

4.1.3 Using AFUDOS to copy BIOS from PC ................. 4-3

4.1.4 Using ASUS EZ Flash to update the BIOS ............ 4-4

4.1.5 Recovering the BIOS with CrashFree BIOS 2 ....... 4-5

4.2 BIOS Setup program .......................................................... 4-7

4.2.1 BIOS menu screen ................................................ 4-8

4.2.2 Menu bar................................................................ 4-8

4.2.3 Navigation keys ..................................................... 4-8

4.2.4 Menu items ............................................................ 4-9

4.2.5 Sub-menu items..................................................... 4-9

4.2.6 Configuration fields ................................................ 4-9

4.2.7 Pop-up window ...................................................... 4-9

4.2.8 Scroll bar................................................................ 4-9

4.2.9 General help .......................................................... 4-9

4.3 Main menu........................................................................ 4-10

4.3.1 System Time [xx:xx:xxxx]..................................... 4-10

4.3.2 System Date [Day xx/xx/xxxx] ............................. 4-10

4.3.3 Legacy Diskette A [1.44M, 3.5 in.] ....................... 4-10

4.3.4 Language [English] .............................................. 4-10

4.3.5 Primary and Secondary IDE Master/Slave; Third .......

and Fourth IDE Master .........................................4-11

4.3.6 IDE Configuration ................................................ 4-12

4.3.7 System Information .............................................. 4-14

4.4 Advanced menu ............................................................... 4-15

4.4.1 JumperFree Configuration ................................... 4-15

4.4.2 CPU Configuration ............................................... 4-18

4.4.3 Chipset................................................................. 4-18

4.4.4 Onboard Devices Configuration........................... 4-20

4.4.5 PCI PnP ............................................................... 4-22

4.4.6 USB Configuration ............................................... 4-23

4.4.7 Instant Music Configuration ................................. 4-25

4.5 Power menu ..................................................................... 4-26

4.5.1 Suspend Mode [Auto] .......................................... 4-26

4.5.2 Repost Video on S3 Resume [No] ....................... 4-26

4.5.3 ACPI 2.0 Support [No] ......................................... 4-26

4.5.4 ACPI APIC Support [Enabled] ............................. 4-26

4.5.5 BIOS -> AML ACPI Table [Enabled] ..................... 4-26

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Contents

4.5.6 APM Configuration............................................... 4-27

4.5.7 Hardware Monitor ................................................ 4-29

4.6 Boot menu ........................................................................ 4-31

4.6.1 Boot Device Priority ............................................. 4-31

4.6.2 Hard disk drives ................................................... 4-32

4.6.3 Boot Settings Configuration ................................. 4-32

4.6.4 Security ................................................................ 4-34

4.7 Exit menu ......................................................................... 4-36

Chapter 5: Software support

5.1 Install an operating system................................................. 5-1

5.2 Support CD information...................................................... 5-1

5.2.1 Running the support CD ........................................ 5-1

5.2.2 Drivers menu ......................................................... 5-2

5.2.3 Utilities menu ......................................................... 5-3

5.2.4 ASUS Contact Information..................................... 5-4

5.2.5 Other information ................................................... 5-5

5.3 Software information .......................................................... 5-7

5.3.1 ASUS Update ........................................................ 5-7

5.3.2 ASUS MyLogo2™.................................................. 5-8

5.3.3 ASUS PC Probe .................................................. 5-10

5.3.4 ASUS Instant Music ............................................. 5-14

®

5.3.5 SoundMAX

4 XL software .................................. 5-17

®

5.4 Intel

RAID for Serial ATA configurations.......................... 5-21

5.5.1 BIOS Configuration .............................................. 5-21

5.5.2 Installing Serial ATA hard disks ............................ 5-21

5.5.3 Creating, Deleting and Resetting RAID sets........ 5-22

5.5.4 Creating a RAID Volume...................................... 5-22

5.5.5 Deleting a RAID Volume ...................................... 5-23

5.5.6 Reset RAID Data ................................................. 5-24

®

5.5 Using Intel

Makedisk.exe ................................................ 5-25

®

5.6 Marvell

Virtual Cable Tester™ (VCT) Technology........... 5-26

v

FCC/CDC statements

Federal Communications Commission Statement

This device complies with FCC Rules Part 15. Operation is subject to the

following two conditions:

• This device may not cause harmful interference, and

• 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 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

manufacturer’s 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 to an outlet on a circuit different from that to

which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

The use of shielded cables for connection of the monitor to the

graphics card is required to assure compliance with FCC regulations.

Changes or modifications to this unit not expressly approved by the

party responsible for compliance could void the user’s authority to

operate this equipment.

Canadian Department of Communications Statement

This digital apparatus does not exceed the Class B limits for radio noise

emissions from digital apparatus set out in the Radio Interference

Regulations of the Canadian Department of Communications.

This class B digital apparatus complies with Canadian ICES-003.

vi

Safety information

Electrical safety

• To prevent electrical shock hazard, disconnect the power cable from

the electrical outlet before relocating the system.

• When adding or removing devices to or from the system, ensure that

the power cables for the devices are unplugged before the signal

cables are connected. If possible, disconnect all power cables from the

existing system before you add a device.

• Before connecting or removing signal cables from the motherboard,

ensure that all power cables are unplugged.

• Seek professional assistance before using an adpater or extension

cord. These devices could interrupt the grounding circuit.

• Make sure that your power supply is set to the correct voltage in your

area. If you are not sure about the voltage of the electrical outlet you

are using, contact your local power company.

• If the power supply is broken, do not try to fix it by yourself. Contact a

qualified service technician or your retailer.

Operation safety

• Before installing the motherboard and adding devices on it, carefully

read all the manuals that came with the package.

• Before using the product, make sure all cables are correctly connected

and the power cables are not damaged. If you detect any damage,

contact your dealer immediately.

• To avoid short circuits, keep paper clips, screws, and staples away from

connectors, slots, sockets and circuitry.

• Avoid dust, humidity, and temperature extremes. Do not place the

product in any area where it may become wet.

• Place the product on a stable surface.

• If you encounter technical problems with the product, contact a

qualified service technician or your retailer.

vii

About this guide

This user guide contains the information you need when installing the

ASUS P4P800 motherboard.

How this guide is organized

This manual contains the following parts:

• Chapter 1: Product introduction

This chapter describes the features of the P4P800 motherboard. It

includes brief descriptions of the special attributes of the motherboard

and the new technology it supports.

• Chapter 2: Hardware information

This chapter lists the hardware setup procedures that you have to

perform when installing system components. It includes description of

the switches, jumpers, and connectors on the motherboard.

• Chapter 3: Powering up

This chapter describes the power up sequence and ways of shutting

down the system.

• Chapter 4: BIOS setup

This chapter tells how to change system settings through the BIOS

Setup menus. Detailed descriptions of the BIOS parameters are also

provided.

• Chapter 5: Software support

This chapter describes the contents of the support CD that comes with

the motherboard package.

viii

Conventions used in this guide

To make sure that you perform certain tasks properly, take note of the

following symbols used throughout this manual.

WARNING: Information to prevent injury to yourself when trying

to complete a task.

CAUTION: Information to prevent damage to the components

when trying to complete a task.

IMPORTANT: Information that you MUST follow to complete a

task.

NOTE: Tips and additional information to aid in completing a task.

Where to find more information

Refer to the following sources for additional information and for product

and software updates.

1. ASUS Websites

The ASUS websites worldwide provide updated information on ASUS

hardware and software products. The ASUS websites are listed in the

ASUS Contact Information on page x.

2. Optional Documentation

Your product package may include optional documentation, such as

warranty flyers, that may have been added by your dealer. These

documents are not part of the standard package.

ix

1.3 Special features

1.3.1 Product highlights

Latest processor technology

®

®

The P4P800 motherboard supports the latest Intel

Pentium

4 Processor via

a 478-pin surface mount ZIF socket. The Pentium 4 processor with 512KB L2

cache on 0.13 micron processor includes a 800/533/400 MHz system bus

and the FMB2 power design that allows up to 3.2+ GHz core frequencies

®

and Intel

future Prescott CPU. See page 2-4.

Dual Channel DDR memory support

Employing the dual channel Double Data Rate (DDR) memory architecture,

the P4P800 motherboard supports up to 4GB of system memory using

PC3200/2700/PC2100 DDR DIMMs. The ultra-fast 400MHz memory bus

double the bandwidth to a maximum of 6.4GB/s that delivers the required

bandwidth for the latest 3D graphics, multimedia, and Internet applications.

See page 2-10.

Serial ATA solution, RAID 0 support

The motherboard supports two interfaces compliant to the Serial ATA

(SATA) specification, an evolutionary replacement of the Parallel ATA

storage interface. The Serial ATA specification allows for thinner, more

flexible cables with lower pin count, reduced voltage requirement, up to

®

150 MB/s data transfer rate. With the SATA support built-in Intel

ICH5R

controller onboard, the motherboard supports RAID 0 configuration using

SATA drives. See page 2-25

Ai NET solution

The Ai Series supports Gigabit LAN by integrating the 3COM 3C940

controller, equipped with a unique net-diagnosing utility - VCT (Virtual

Cable Tester). VCT intelligently diagnoses and reports cable faults from a

remote location up to 100 meters and helps users improve network quality.

See page 5-26.

AGP 8X support

AGP 8X (AGP 3.0) is the next generation VGA interface specification that

enables enhanced graphics performance with high bandwidth speeds up

to 2.12 GB/s. See page 2-18.

1-2

Chapter 1: Product introduction

Ai Audio solution

The SoundMAX-class ADI AD1985 AC ‘97 audio CODEC supports

6-channel 5.1 surround sound output, stereo microphone input, variable

sample rate conversion (SRC), professional quality 103-dB out put with

94-dB SNR, and analog enumeration capability. The SoundMAX 4 XL

software features the AudioESP™ (Audio Enumeration and Sensing

Process) that allows intelligent detection of the peripherals plugged into

the audio ports and identifies the incompatible devices, if any. See 5-17.

USB 2.0 technology

The motherboard implements the new Universal Serial Bus (USB) 2.0

specification, extending the connection speed from 12 Mbps on USB 1.1

to a fast 480 Mbps on USB 2.0 - supporting up to 8 USB 2.0 ports. The

higher bandwidth of USB 2.0 allows connection of devices such as high

resolution video conferencing cameras, next generation scanners and

printers, and fast storage units. USB 2.0 is backward compatible with USB

1.1. See page 2-30.

C.P.R. (CPU Parameter Recall)

The C.P.R. feature of the motherboard BIOS allows automatic re-setting to

the BIOS previous settings in case the system hangs due to overclocking.

When the system hangs due to overclocking, C.P.R. eliminates the need to

open the system chassis and clear the RTC data. Simply reboot the

system, and BIOS automatically restores the previous values of the CPU

parameters.

ASUS MyLogo2™

This new feature present in the P4P800 motherboard allows you to

personalize and add style to your system with customizable boot logos.

See details on page 5-8.

ASUS Multi-language BIOS

The multi-language BIOS allows you to select the language of your choice

from the available options. The localized BIOS menus allow you to

configure easier and faster. Visit the ASUS website for information on the

supported languages. See page 4-10.

ASUS P4P800 motherboard user guide

1-3

ASUS EZ Flash BIOS

With the ASUS EZ Flash, you can easily update the system BIOS even

before loading the operating system. No need to use a DOS-based utility

or boot from a floppy disk. See details on page 4-4.

ASUS Q-Fan technology

The ASUS Q-Fan technology smartly adjusts the fan speeds according to

the system loading to ensure quiet, cool, and efficient operation.

CrashFree BIOS 2

This feature allows you to restore the original BIOS data from the ASUS

support CD in case when the BIOS codes and data are corrupted. This

protection eliminates the need to buy a replacement ROM chip. See

details on page 4-5.

ASUS J-Panel

This optional device is designed for ASUS motherboards with USB,

S/PDIF or Intel Front Panel audio connector for additional front I/O

connectors.

Instant Music

This unique feature allows you to playback audio files even without

booting the system to Windows™. Just press the ASUS Instant Music

special function keys and enjoy the music! See details on page 5-14.

1-4

Chapter 1: Product introduction

1.3.2 Value-added solutions

Overclocking

• adjustable CPU frequency multiple in BIOS using the ASUS

JumperFree™ solution

• C.P.R. (CPU Parameter Recall)

• adjustable CPU V

CORE

, and DDR memory and AGP voltages

• Stepless Frequency Selection (SFS) for fine-tuning system bus

frequency from 100MHz up to 400MHz at 1MHz increments

Temperature, fan, and voltage monitoring

The CPU temperature is monitored by the ASUS ASIC to prevent

overheating and damage. The system fan rotations per minute (RPM) is

monitored for timely failure detection. The system voltage levels are

monitored to ensure stable supply of current for critical components.

Chassis intrusion detection

The motherboard supports chassis intrusion monitoring through the

Winbond ASIC. A chassis intrusion event is retained in CMOS for more

protection.

ASUS update

This utility allows you to update the motherboard BIOS through a user-

friendly interface. Connect to the Internet then to the ASUS FTP site

nearest you to obtain the latest BIOS version for your motherboard.

ASUS P4P800 motherboard user guide

1-5

1.4 Motherboard overview

Before you install the P4P800 motherboard, familiarize yourself with its

physical configuration and available features to facilitate the motherboard

installation and future upgrades. A sufficient knowledge of the motherboard

specifications will also help you avoid mistakes that may damage the

board and its components.

1.4.1 Major components

The following are the major components of the P4P800 motherboard as

pointed out in the picture on page 1-7.

1. ATX 12V connector

15. PCI slots

2. CPU socket

16. Audio CODEC

3. North Bridge controller

17 Gigabit LAN controller

4. DDR DIMM sockets

18. PS/2 Mouse

5. ATX Power connector

19. Parallel port

6. Super I/O controller

20. RJ-45 port

7. Floppy disk connector

21. Line In jack

8. IDE connectors

22. Line Out jack

9. AGP slot

23. Microphone jack

10. Serial ATA connectors

24. USB 2.0 ports 3 and 4

11. Flash ROM

25. USB 2.0 ports 1 and 2

12. South Bridge controller

26. Serial port

13. Standby Power LED

27. S/PDIF output port

14. WiFi slot

28. Keyboard port

See page 1-8 for the specifications of each component. Refer to

Chapter 2 for detailed information on the components.

1-6

Chapter 1: Product introduction

ASUS P4P800 motherboard user guide

1-7

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25

1.4.2 Core specifications

ATX 12V connector. This power connector connects the 4-pin 12V

1

plug from the ATX 12V power supply.

CPU socket. A 478-pin surface mount, Zero Insertion Force (ZIF)

2

®

®

socket for the Intel

Pentium

4 Processor (and Intel’s future Prescott

CPU) support with 800/533/400 MHz system bus that allows up to

6.4GB/s data transfer rates.

®

North bridge controller. The Intel

82865PE Memory Controller Hub

3

(MCH) provides the processor interface with 800/533/400 MHz

frequency, system memory interface at 400/333/266MHz operation,

and 1.5V AGP interface that supports AGP 3.0 specification including

8X Fast Write protocol.

DDR DIMM sockets. These four 184-pin DIMM sockets support up to

4

4GB system memory using unbuffered non-ECC PC3200/2700/2100

DDR DIMMs.

ATX power connector. This 20-pin connector connects to an ATX

5

+12V power supply. The power supply must have at least 1A on the

+5V standby lead (+5VSB).

Super I/O controller. The Winbond 83627THF Low Pin Count (LPC)

6

interface provides the commonly used Super I/O functionality. The

chipset supports a high-performance floppy disk controller for a 360K/

720K/1.44M/2.88M floppy disk drive, a multi-mode parallel port, two

serial ports, a GAME port, the mouse and keyboard interface and

the LPC (Low Pin Count) interface.

Floppy disk connector. This connector accommodates the provided

7

ribbon cable for the floppy disk drive. One side of the connector is

slotted to prevent incorrect insertion of the floppy disk cable.

8

IDE connectors. These dual-channel bus master IDE connectors

support Ultra DMA100/66, PIO Modes 3 & 4 IDE devices. Both the

primary (blue) and secondary (black) connectors are slotted to prevent

incorrect insertion of the IDE ribbon cable.

AGP slot. This Accelerated Graphics Port (AGP) slot supports 1.5V

9

AGP8X mode graphics cards for 3D graphical applications.

Serial ATA connectors. These two 7-pin connectors accommodate

10

the thin cables for Serial ATA devices.

1-8

Chapter 1: Product introduction

11

Flash ROM. This 4Mb firmware contains the programmable BIOS

program.

®

12

South bridge controller. The Intel

ICH5R is a subsystem that

integrates various I/O functions including 2-channel ATA100 bus

master IDE controller, SATA RAID controller, up to eight USB 2.0/1.1

ports, I/O APIC, AC’97 2.2 interface, and PCI 2.3 interface.

Standby power LED. This LED lights up if there is a standby power

13

on the motherboard. This LED acts as a reminder to turn off the

system power before plugging or unplugging devices.

Wi-Fi slot. The Wi-Fi (Wireless Fidelity) slot connects a Wi-Fi

14

wireless networking module that allows 11Mbps transmission (with

a fallback to 5.5, 2, and 1 Mbps) in the 2.4 GHz band. Wi-Fi

networks use radio technologies known as IEEE 802.11b to provide

a fast reliable wireless connectivity.

PCI slots. These five 32-bit PCI 2.2 expansion slots support bus

15

master PCI cards like SCSI or LAN cards with 133MB/s maximum

throughput.

Audio CODEC. The ADI AD1985 is an AC’97 CODEC that allows

16

6-channel audio playback. The audio CODEC provides six DAC

channels for 5.1 surround sound, S/PDIF output, AUX and Line In

stereo inputs, integrated headphone amplifier, greater than 90dB

dynamic range with the jack sense and jack enumeration feature.

LAN controller. The 3COM 3C940 Gigabit Ethernet is a single-chip

17

solution for LAN on Motherboard (LOM) application. The 3C940

provides a 32-bit interface and supports 1000/100/10 Mbps data

transfer rates.

PS/2 mouse port. This green 6-pin connector is for a PS/2 mouse.

18

Parallel port. This 25-pin port connects a parallel printer, a scanner,

19

or other devices.

RJ-45 port. This port allows connection to a Local Area Network

20

(LAN) through a network hub.

21

Line In jack. This Line In (light blue) jack connects a tape player or

other audio sources. In 6-channel mode, the function of this jack

becomes Rear Speaker Out.

ASUS P4P800 motherboard user guide

1-9

Line Out jack. This Line Out (lime) jack connects a headphone or a

22

speaker. In 6-channel mode, the function of this jack becomes Front

Speaker Out.

Microphone jack. This Mic (pink) jack connects a microphone. In 6-

23

channel mode, the function of this jack becomes Bass/Center

Speaker Out.

USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus

24

(USB) ports are available for connecting USB 2.0 devices.

USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB)

25

ports are available for connecting USB 2.0 devices.

Serial port. This 9-pin COM1 port is for pointing devices or other

26

serial devices.

S/PDIF jack. This jack connects to external audio output devices.

27

PS/2 keyboard port. This purple connector is for a PS/2 keyboard.

28

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Chapter 1: Product introduction