SOYO SY-6VCA User manual

SY-6VCA
Motherboard
****************************************************
Pentium® III, Pentium® II & Celeron
Processor supported
Via 694X AGP/PCI/AMR Motherboard
66/100/133 MHz Front Side Bus supported
ATX Form Factor
****************************************************
User's Manual

SOYO™SY-6VCA
ii
Copyright © 1999 by Soyo Computer Inc.
Trademarks:
Soyo is the registered trademark of Soyo Computer Inc. All trademarks are the
properties of their owners.
Product Rights:
All names of the product and corporate mentioned in this publication are used for
identification purposes only. The registered trademarks and copyrights belong to
their respective companies.
Copyright Notice:
All rights reserved. This manual has been copyrighted by Soyo Computer Inc. No
part of this manual may be reproduced, transmitted, transcribed, translated into any
other language, or stored in a retrieval system, in any form or by any means, such
as by electronic, mechanical, magnetic, optical, chemical, manual or otherwise,
without permission in writing from Soyo Computer Inc.
Disclaimer:
Soyo Computer Inc. makes no representations or warranties regarding the contents
of this manual. We reserve the right to amend the manual or revise the
specifications of the product described in it from time to time without obligation to
notify any person of such revision or amend. The information contained in this
manual is provided to our customers for general use. Customers should be aware
that the personal computer field is subject to many patents. All of our customers
should ensure that their use of our products does not infringe upon any patents. It is
the policy of Soyo Computer Inc. to respect the valid patent rights of third parties
and not to infringe upon or to cause others to infringe upon such rights.
Restricted Rights Legend:
Use, duplication, or disclosure by the Government is subject to restrictions set
forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer
Software clause at 252.277-7013.
About This Guide:
This Quick Start Guide can help system manufacturers and end users in setting up
and installing the Motherboard. Information in this guide has been carefully
checked for reliability; however, to the correctness of the contents there is no
guarantee given. The information in this document is subject to amend without
notice.
For further information, please visit our Web Site on the Internet. The address is
"http://www.soyo.com.tw".
Edition: March 2000
Version 1.0
6VCA SERIAL
FC
CTested To Comply
With FCC Standards
FOR HOME OR OFFICE USE
POST CONSUMER
RECYCLED PAPER100%

Table of Contents SY-6VCA
iii
Table of Contents
CHAPTER 1 MOTHERBOARD DESCRIPTION...............................1
1-1 INTRODUCTION..............................................................1
1-2 KEY FEATURES...............................................................1
1-3 HANDLING THE MOTHERBOARD ..............................5
1-4 ELECTROSTATIC DISCHARGE PRECAUTIONS.........5
1-5 SY-6VCA MOTHERBOARD LAYOUT ..........................6
1-6 SY-6VCA MOTHERBOARD COMPONENTS ...............7
1-7 MICROPROCESSOR........................................................9
1-8 SY-6VCA MOTHERBOARD COMPONENTS .............10
1-9 MICROPROCESSOR......................................................12
1-10 I/O INTERFACE CONTROLLER...................................16
1-11 HARDWARE MONITOR................................................18
1-12 WAKE ON LAN TECHNOLOGY..................................19
CHAPTER 2 HARDWARE INSTALLATION...................................20
2-1 PREPARATIONS.............................................................20
2-2 UNPACKING THE MOTHERBOARD ..........................21
2-3 INSTALLATION GUIDE................................................22
2-3.1 CPU Fan Installation....................................................23
2-3.2 SDRAM Memory Module Installation...........................26
2-3.3 Motherboard Connector................................................28
2-3.4 Jumper Setting...............................................................42
2-3.5 CMOS Clearing (JP5)...................................................43
2-3.6 Power On ......................................................................43
2-3.7 Quick BIOS Setup..........................................................44
2-3.8 Troubleshooting at First Start.......................................47
2-3.9 Power Off......................................................................51
CHAPTER 3 BIOS SETUP UTILITY.................................................52

Table of Contents SY-6VCA
iv
3-1 SOYO COMBO SETUP...................................................55
3-2 STANDARD CMOS SETUP............................................59
3-3 ADVANCED BIOS FEATURES......................................62
3-4 ADVANCED CHIPSET FEATURES...............................66
3-5 INTEGRATED PERIPHERALS.......................................71
3-6 POWER MANAGEMENT SETUP..................................76
3-7 PNP/PCI CONFIGURATION SETUP..............................80
3-8 PC HEALTH STATUS......................................................83
3-9 LOAD FAIL-SAFE DEFAULTS ......................................85
3-10 LOAD OPTIMIZED DEFAULTS.....................................86
3-11 SUPERVISOR PASSWORD ............................................87
3-12 USER PASSWORD..........................................................88
3-13 IDE HDD AUTO DETECTION.......................................89
CHAPTER 4 DRIVERS INSTALLATION ..........................................90
CHAPTER 5 VIA SOUNDCHIP DRIVERS INSTALLATION .........94

Motherboard Description SY-6VCA
1
Chapter 1
MOTHERBOARD DESCRIPTION
1-1 INTRODUCTION
The SY-6VCA AGP/PCI/AMR Motherboard is a high-performance Slot 1
ATX form-factor system board. the SY-6VCA uses VIA Chipset
technology and supports Slot 1 class processors. This Motherboard is fully
compatible with industry standards and adds many technical
enhancements.
1-2 KEY FEATURES
ØCPU SUPPORT
The SY-6VCA supports a wide range of INTEL CPUs:
nFSB 133MHz: Intel Pentium® III 533~866 MHz
nFSB 100MHz: Intel Pentium® II 350~450 MHz
Intel Pentium® III 450~800 MHz
nFSB 66MHz: Intel Pentium® II 233~333 MHz
Intel Celeron® 266~433 MHz
New released Intel Slot 1 CPUs will very likely be supported by the SY-
6VCA as well.
ØCPU SETTINGS
The SY-6VCA provides the user with a very complete and convenient
CPU setting environment. The CPU settings are all adjusted through the
special SOYO COMBO page in the BIOS, therefore rendering the use of
jumpers obsolete.
nCPU FSB Frequency
The SY-6VCA supports an incredible wide range of CPU FSB frequency
settings:
66, 75, 81, 83, 90, 95, 100, 105, 110, 112, 113, 115, 117, 118, 120, 122,
124, 126, 133, 135, 137, 138, 140, 142, 144, 150 and 155 MHz.
This ensures that the SY-6VCA has an overwhelming overclocking
potential.

Motherboard Description SY-6VCA
2
nCPU Multiplier
The SY-6VCA supports a wide range of multipliers:
2.0x, 2.5x, 3.0x, 3.5x, 4.0x, 4.5x, 5.0x, 5.5x, 6.0x, 6.5x, 7.0x, 7.5x and
8.0x
ØEXPANDABILITY
The SY-6VCA provides all the standard expansion slots, and many more
additional expansion features:
uExpansion slots
n1 x 32-bit bus master AGP slot
n5 x 32-bit bus master PCI slots
n1 x 16-bit ISA slots
uEnhanced IO
nFloppy disk controller
n2x EIDE controllers with support for up to 4 Ultra DMA 33/66
devices
nStandard/EPP/ECP parallel port
n2x 16550 compatible serial ports
nIrDA compatible infrared port
n4x USB (Universal Serial Bus) connectors
nPS/2 mouse connector
nPS/2 keyboard connector

Motherboard Description SY-6VCA
3
ØADVANCED FUNCTIONS
The SY-6VCA supports advanced functions such as:
nWake-On-LAN
Supports Wake-On-LAN (Some advanced network cards can
wake the system up over the network, the WOL connector is
provided by the SY-6VCA to support this function).
nMultiple boot
The SY-6VCA supports booting from devices such as CD-ROM.
nPower on by modem or alarm
If the SY-6VCA system is in suspend mode, it can be switched back
on through the modem or RTC alarm through this function. This
opens a lot of possibilities, such as remote access that switches the
system on only after the modem receives a call.
ØFAIL SAFE
The SY-6VCA comes with added functionality to make managing the
system easy and safe
uHardware Monitor
The integrated Hardware Monitor IC and Hardware doctor software
enables the user to monitor system voltages, temperatures and FAN speeds.
This makes sure that the user is full control of the system
uPower Failure Resume Function
This function can be set in the BIOS, and determines whether the system
will automatically turn on again after a power failure. This function is
indispensable for server systems that need to always be on line.
u5VSB Indicator
This green LED gives an indication of the presence of the 5V Standby
voltage. This voltage is always fed into the motherboard and is used for
functions such as WOL.
ØNORTON SOFTWARE PACK
nAntivirus
nGhost

Motherboard Description SY-6VCA
4
nVirtual Drive
ØCOMPLIANCE
The SY-6VCA complies with all important industry standards. The
following underlines the reliability of the SY-6VCA, a motherboard to
trust.
nPC99, ACPI compliant
ØUSER FRIENDLY
nSOYO Combo Setup
nJumperless design
nYou can set up the following options trough the BIOS setting
CPU FSB frequency
CPU multiplier
CPU Vcore voltage
PCI clock
AGP Clock
SDRAM Clock

Motherboard Description SY-6VCA
5
1-3 HANDLING THE MOTHERBOARD
To avoid damage to your Motherboard, follow these simple rules while
unpacking:
ØBefore handling the Motherboard, ground yourself by grasping an
unpainted portion of the system's metal chassis.
ØRemove the Motherboard from its anti-static packaging. Hold the
Motherboard by the edges and avoid touching its components.
ØCheck the Motherboard for damage. If any chip appears loose, press
carefully to seat it firmly in its socket.
Warning: Do not apply power if the Motherboard appears
damaged. If there is damage to the board, contact your dealer
immediately.
1-4 ELECTROSTATIC DISCHARGE PRECAUTIONS
Make sure to ground yourself before handling the Motherboard or other
system components. Electrostatic discharge can easily damage the
components. Note that you must take special precautions when handling
the Motherboard in dry or air-conditioned environment.
To protect your equipment from electrostatic discharge, take the following
precautions:
ØDo not remove the anti-static packaging until you are ready to install.
ØGround yourself before removing any system component from its
protective anti-static packaging. (To ground yourself, grasp the expansion
slot covers or other unpainted portions of the computer chassis.)
ØFrequently ground yourself while working or use a grounding strap.
ØHandle the Motherboard by its edges and avoid touching its
components.

Motherboard Description SY-6VCA
6
1-5 SY-6VCA MOTHERBOARD LAYOUT
Back Panel SY-6VCA Platform
PRT
USB 1
USB2
PS/2 KB
Connector
PS/2 Mouse
Connector
PCI Slot #1
PCI Slot #3
PCI Slot #5
PCI Slot #4
AMR
3V
Lithium
Battery
CPUFAN
1
IDE 2IDE 1
1
1
1
FDC
ATX Power
LINE-OUT
LINE-IN
MIC JACK
JOYSTICK
JP10
WOL
Header
3
1
JP5
Jumper
CMOS Clear
DIMM 1 DIMM 2 DIMM 3
1
CHAFAN
COM2
PCI Slot #2
CODEC
AC97
Speaker
Power
LED
HDD
LED
_
+
_
+
_
+
Reset
PWRBT
USB4
SDRAM
1
3
1
4
2
5
3
6
SIRCON
1
5
1
1
5
5
COM 1
Slot 1
AGP Slot
®
694X
For
Pentium II or Pentium III
(SECC& SECC2)
Processors
R
R
1
4
CDIN1
CDIN2
ISA Slot #1
686A
Flash BIOS
1
4
USB3
VJ1

Motherboard Description SY-6VCA
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1-6 SY-6VCA MOTHERBOARD COMPONENTS
SDRAM
®
A
B
D
C
E
F
G
H
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
I

Motherboard Description SY-6VCA
8
ACD-IN Connectors
BAudio Modem Riser Slot
CCPU Core Voltage Adjust Jumper Setting
DSlot 1 Connector
ECPU Cooling Fan Connector
FVia 694X North Bridge chip
GDIMM Banks
HATX Power Supply Connector
IBus Mastering e-IDE/ATAPI Ports
J32-bit AGP Slot
K3V Lithium Battery
LFloppy Disk Drive (FDD) Port
MVia 686A South Bridge Chip
NCMOS Clear Jumper
OUSB Ports
PFront panel connectors
QSerial Infrared (IrDA) Device Header
RChassis Cooling Fan
S16-bit ISA Slot
TFlash BIOS
U32-bit PCI Mastering Slots
VWake-On-LAN (WOL) Header
WAC97 Codec Chip
XBack panel Connectors

Motherboard Description SY-6VCA
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1-7 MICROPROCESSOR
The motherboard supports a single Slot 1 processor. The processor’s VID
pins automatically program the voltage regulator on the motherboard to
the required processor voltage. In addition, the front side bus speed (100
MHz and 133 MHz) is automatically selected. The motherboard supports
all current Slot 1 processor speeds, voltages, and bus frequencies.
1-7.1 Microprocessor Packaging
The processor is packaged in a Single Edge Contact Cartridge (S.E.C.C)
or Single Edge Processor Package (S.E.P.P). The cartridge includes the
processor core, second-level cache subsystem, thermal plate, and back
cover.
The processor connects to the motherboard through the Slot1 connector, a
242-pin edge connector. When mounted in Slot1, the processor is secured
by a retention mechanism attached to the motherboard. A passive heatsink
is stabilized by the heatsink supports.
1-7.2 Second Level Cache
The second-level cache is located on the substrate of the CPU package.
The cache includes 0KB/128KB (Celeron) or 512 KB (PII/PIII) of
synchronous pipelined burst static RAM. All supported onboard memory
can be cached.
1-7.3 Microprocessor Upgrades
The motherboard can be upgraded with Slot 1 processors that run at higher
speeds. When upgrading the processor, use the BIOS configuration mode
to change the processor speed.

Motherboard Description SY-6VCA
10
1-8 MEMORY
1-8.1 Main Memory
The motherboard has three DIMM sockets. SDRAM can be installed in
one, two, or three sockets. Using the serial presence detect (SPD) data
structure, programmed into an E²PROM on the DIMM, the BIOS can
determine the SDRAM’s size and speed. Minimum DIMM memory size is
8 MB; maximum DIMM memory size is 256/512 MB. Memory size and
speed can vary between sockets.
The motherboard supports the following memory features:
DRAM interface synchronous with host CPU (66/100/133MHz)or
AGP (66MHz) for most flexible configuration
DRAM interface may be faster than CPU by 33 MHz to allow use
of PC100 memory modules with 66MHz Celeron or use of PC133
with 100MHz Pentium II or Pentium III
DRAM interface may be slower than CPU by 33 MHz to allow use
of older memory modules with newer CPUs (e.g., PC66 memory
modules with 100MHz Pentium II or Pentium III)
Concurrent CPU, AGP, and PCI access
Supports FP,EDO, SDRAM, ESDRAM and VCM SDRAM
memory types
Different DRAM types may be used in mixed combinations
Different DRAM timing for each bank
Dynamic Clock Enable (CKE) control for SDRAM power
reduction in high speed system.
Mixed 1M/2M/4M/8M/16M/32MxN DRAMs
The 6VCA supports 3 DIMMs or 6 banks at 133MHz for 1.5GB
max memory.
Flexible row and column addresses
64-bit data width only
3.3V DRAM interface with 5V-tolerant inputs
Programmable I/O drive capability for MA, command, and MD
signals

Motherboard Description SY-6VCA
11
Dual copies of MA signals for improved drive
Optional bank-by-bank ECC (single-bit error correction and multi-
bit error detection) or EC(error checking only) for DRAM integrity
Two-bank interleaving for 16Mbit SDRAM support
Two-bank and four bank interleaving for 64Mbit SDRAM support
Independent SDRAM control for each bank
Seamless DRAM command scheduling for maximum DRAM bus
utilization (e.g., precharge other banks while accessing the current
bank)
Four cache lines (16quadwords) of CPU to DRAM write buffers
Four cache lines of CPU to DRAM read prefetch buffers
Read around write capability for non-stalled CPU read
Speculative DRAM read before snoop result
Burst read and write operation
x-2-2-2-2-2-2-2 bank-to-back accesses for EDO DRAM from CPU
or from DRAM controller
x-1-1-1-1-1-1-1 back-to back accesses for SDRAM
BIOS shadow at 16KB increment
Decoupled and burst DRAM refresh with staggered RAS timing
CAS before RAS or self refresh

Motherboard Description SY-6VCA
12
1-9 CHIPSET
ØVT82C694X
The VIA 694X is a high performance, cost-effective and energy efficient
chip set for the implementation of AGP/PCI/ISA desktop personal
computer systems from 66MHz, 100MHz and 133MHz based on 64-bit
Slot 1 super-scalar processors.
The Via 694X chip set consists of the VT82C694A system controller (510
pin BGA) and the VT82C686A PCI to ISA bridge (324 pin BGA). The
system controller provides superior performance between the CPU,
DRAM, AGP bus, and PCI bus with pipelined, burst, and concurrent
operation.
The VT82C694X supports eight banks of DRAMs up to 1.5GB. The
DRAM controller supports standard Fast Page Mode (FPM) DRAM,
EDO-DRAM, Synchronous DRAM (SDRAM) and Virtual Channel
SDRAM (VC SDRAM), in a flexible mix / match manner. The
Synchronous DRAM interface allows zero wait state bursting between the
DRAM and the data buffers at 66/100/133 MHz. The eight banks of
DRAM can be composed of an arbitrary mixture of
1M/2M/4M/8M/16M/32MxN DRAMs. The DRAM controller also
supports optional ECC (single-bit error correction and multi-bit detection)
or EC (error checking) capability separately selectable on a bank-by-bank
basis. The DRAM controller can run at either the host CPU bus frequency
(66/100/133 MHz) or at the AGP bus frequency (66 MHz) with built-in
PLL timing control.
The VT82C694X system controller also supports full AGP v2.0 capability
for maximum bus utilization including 2x mode transfers, SBA (Side Band
Addressing), Flush/Fence commands, and pipelined grants. An eight level
request queue plus a four level post-write request queue with thirty-two
and sixteen quad words of read and write data FIFO’s respectively are
included for deep pipelined and split AGP transactions. A single-level
GART TLB with 16 full associative entries and flexible CPU/AGP/PCI
remapping control is also provided for operation under protected mode

Motherboard Description SY-6VCA
13
operating environments. Both Window 95 VxD and Windows 98 /NT5.0
mini port drivers are supported for interoperability with major AGP-based
3D and DVD- capable multimedia accelerators.
The VT82C694X supports two 32-bit 3.3/5V system buses (one AGP and
one PCI) that are synchronous/ pseudo-synchronous to the CPU bus. The
chip also contains a built-in bus-to-bus bridge to allow simultaneous
concurrent operations on each bus. Five levels (double words) of post
write buffers are included to allow for concurrent CPU and PCI operation.
For PCI master operation, forty-eight levels (double words) of post write
buffers and sixteen levels (double words) of prefetch buffers are included
for concurrent PCI bus and DRAM/cache accesses. The chip also supports
enhanced PCI bus commands such as Memory-Read-Line, Memory-Read-
Multiple and Memory-Write-Invalid commands to minimize snoop
overhead. In addition, advanced features are supported such as snoop
ahead, snoop filtering, L1 write-back forward to PCI master, and L1 write-
back merged with PCI post write buffers to minimize PCI master read
latency and DRAM utilization. Delay transaction and read caching
mechanisms are also implemented for further improvement of over all
system performance.
The 352-pin Ball Grid Array VT82C686A PCI to ISA bridge supports four
levels (double words) of line buffers, type F DMA transfers and delay
transaction to allow efficient PCI bus utilization The VT82C686A also
includes an integrated keyboard controller with PS/2 mouse support,
integrated DS12885 style real time clock with extended 256 byte CMOS
RAM, integrated master mode enhanced IDE controller with full scatter/
gather capability and extension to UltraDMA-33/66 for 33/66 MB/sec
transfer rate, integrated USB interface with root Hub and two function
ports with built-in physical layer transceivers, Distributed DMA supports,
and On Now/ ACPI compliant advanced configuration and power
management interface.
For sophisticated power management, the Via 694X provides independent
clock stop control for the CPU/SDRAM, PCI, and AGP buses and

Motherboard Description SY-6VCA
14
Dynamic CKE control for powering down of the SDRAM. A separate
suspend-well plane is implemented for the SDRAM control signals for
Suspend-to-DRAM operation. Coupled with the VT82C686A south bridge
chip, a complete power conscious PC motherboard can be implemented
with no external TTLs.
The Via 694X chipset is ideal for high performance, high quality, high
energy efficient and high integration desktop and notebook AGP / PCI /
ISA computer systems.
ØVT82C686A
The VT82C686A PSIPC (PCI Super-I/O integrated Peripheral Controller)
is a high integration, high performance, power-efficient, and high
compatibility device that supports Intel and non-Intel based processor to
PCI bus bridge functionality to make a complete Microsoft PC99-
compliant PCI/ISA system In addition to complete ISA extension bus
functionality, the VT82C686A includes standard intelligent peripheral
controllers:
1)Master mode enhanced IDE controller with dual channel DMA engine
and interlaced dual channel commands. Dedicated FIFO coupled with
scatter and gather master mode operation allows high performance
transfers between PCI and IDE \devices. In addition to standard PIO and
DMA mode operation, the VT82C686A also supports the UltraDMA-33
standard to allow reliable data transfer rates up to 33MB/sec throughput.
The VT82C686A also supports the UltraDMA-66 standard. The IDE
controller is SFF-8038I v1.0 and Microsoft Windows-family compliant.
2)Universal Serial Bus controller that is USB v1.1 and Universal HCI
v1.1 compliant. The VT82C686A includes the root hub with four
function ports with integrated physical layer transceivers. The USB
controller allows hot plug and play and isochronous peripherals to be
inserted into the system with universal driver support. The controller
also implements legacy keyboard and mouse support so that legacy
software can run transparently in non-USB-aware operating system

Motherboard Description SY-6VCA
15
environment.
3)Keyboard controller with PS2 mouse support.
4)Real Time Clock with 256 byte extended CMOS. In addition to the
standard ISA RTC functionality, the integrated RTC also includes the
date alarm, century field, and other enhancements for compatibility with
the ACPI standard.
5)Hardware monitoring subsystem for managing system/ motherboard
voltage levels, temperatures, and fan speeds
6)Full System Management Bus (SMBus) interface.
7)Two 16550-compatible serial I/O ports with infrared communications
port option. A third serial port is available to be dedicated to the IR
interface.
8)Integrated PCI-mastering dual full-duplex direct-sound AC97-link-
compatible sound system. Hardware soundblaster-pro and hardware-
assisted FM blocks are included for Windows DOS box and real-mode
DOS compatibility. Loopback capability is also implemented for
directing mixed audio streams into USB and 1394 speakers for high
quality digital audio
9)Two game ports and One MIDI port
10) ECP/EPP-capable parallel port
11) Standard floppy disk drive interface
12) Distributed DMA capability for support O ISA legacy DMA over
the PCI bus. Serial IRQ is also supported for docking and non-docking
application.
13) Plug and Play controller that allows complete steerability of all PCI
interrupts and internal interrupts/ DMA channels to any interrupt
channel. One additional steerable interrupt channel is provided to allow
plug and play and reconfigurability of onboard peripherals for Windows
family compliance.
The VT82C686A also enhances the functionality of the standard ISA
peripherals. The integrated interrupt controller supports both edge and
level triggered interrupts channel by channel. The integrated DMA

Motherboard Description SY-6VCA
16
controller supports type F DMA in addition to standard ISA DMA modes.
Compliant with the PCI2.2 specification, the VT83C686A supports
delayed transactions and remote power management so that slower ISA
peripherals do not block the traffic of the PCI bus. Special circuitry is built
in to allow concurrent operation without causing dead lock even in a PCI-
to PCI bridge environment. The chip also includes eight levels
(doublewords) of line buffers from the PCI bus to the ISA bus to further
enhance overall system performance.
1-10I/O INTERFACE CONTROLLER
The motherboard uses the VT82C686A Super-I/O controller which
features:
ØSupports 2 serial ports, IR port, parallel port, and floppy disk
controller functions
ØTwo UARTs for Complete Serial Ports
Even, odd, stick or no parity bit generation and detection
Programmable baud rate generator
High speed baud rate (230Kbps, 460Kbps) support
Independent transmit/receiver FIFOs
Modem Control
Plug and play with 96 base IO address and 12 IRQ options
ØOne dedicated IR port
Third serial port dedicated to IR function
IR function either through the two complete serial ports or the
third dedicated port
Infrared-IrDA (HPSIR) and ASK (Amplitude Shift Keyed) IR
ØMulti-mode parallel port
Standard mode, ECP and EPP support
Plug and play with 192 base IO address, 12 IRQ and 4 DMA
options
ØFloppy Disk Controller
16bytes of FIFO
Data rates up to 1Mbps