intersil ISL36356A-APDK DATA SHEET

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ISL36356A-APDK

Data Sheet February 2003

PRISM® 11Mbps Wireless Local Area Network Access Point

The Intersil ISL36356A WLAN Access Point is a complete wireless high speed Network Access Point

(AP) utilizing the Intersil PRISM® AP Direct Sequence Spread Spectrum Wireless Transceiver chip set. It provides a complete PRISM reference design platform of hardware and software to system providers or integrators requiring wireless data communications capability . The Open Source Linux operating system off ers a flexible and extensible development platform for making customized Access Points and Gateways.

The Developers Kit includes a WLAN Access Point reference design, configuration application, source code and documentation. It supports the IEEE802.11b network specification for Direct Sequence Spread Spectrum DSSS signaling, providing data rates of 1, 2, 5.5 and 11Mbps. Typical operating ranges are shown in Table 1.

TABLE 1. TYPICAL OPERATING RANGE*

DATA RATE (Mbps) INDOOR RANGE OUTDOOR RANGE

11 120 feet (37 meters) 500 feet (152 meters)

5.5 200 feet (61 meters) 800 feet (243 meters) 2 240 feet (73 meters) 1300 feet (396 meters) 1 300 feet (91 meters) 1750 feet (533 meters)

* The range will vary in different operating environments due to effects such as building construction.

Ordering Information

PART NUMBER DESCRIPTION INCLUDED

ISL36356A-APDK-EVAL WLAN Evaluation Kit 1 AP

1 PC card

Packaging

FIGURE 1. SAMPLE PLASTIC ENCLOSURE

FN9048.3

Features

• Supports the lEEE802.11b Direct Sequence Specification

• FCC Certified Under Part 15 to Operate in 2.4GHz ISM Band

• ETSI EN 300 328 parts 1 and 2 and

• ETSI EN 301 489 parts 1 and 17 Certified

• Supports All Features Required for Wi-Fi Compliant Access Points

• Support for 11, 5.5, 2 and 1Mbps Data Rates

• Supports Dual Antenna Diversity

• Supports Short Preamble

• Advanced RAKE Receiver Design with Decision Feedback Equalizer

• Provided Wired ethernet (802.3) connection supports both 10/100BaseT speeds

• Open Source Linux operating system

• Wi-Fi Protected Access (WPA) as well as Wired Equivalent Privacy (WEP) 64&128

•802.1x Security

• Wizard for Automated IP Configuration

• Wireless Distribution System (WDS) provides repeater and bridging functionality

References

For Intersil documents available on the internet, see web site http://www .intersi l.com/

[1] TB337 Tech Brief, Intersil Corporation, “A Brief T utorial on

Spread Spectrum and Packet Radio”.

[2] AN9850 Application Note, Intersil Corporation,

“Complementary Code Keying Made Simple”.

[3] AN9829 Application Note, Intersil Corporation, “Brief Tutorial

on IEEE802.11 Wireless LANs”.

[4] AN9820 Application Note, Intersil Corporation, “A

Condensed Review of Spread Spectrum T echniques for ISM Band Systems”.

[5] 555006, Intersil Corporation, "The uClinux Development

Environment".

[6] 555007, Intersil Corporation, "Porting Guide for the Intersil

Access Point".

[7] 555012, Intersil Corporation, "Architecture of a Linux based

Intersil AP".

[8] 555050, Intersil Corporation, “MVC Software Interface

Manual”.

[9] 555053, Intersil Corporation, “AP Developer's Kit End User

Manual”.

[10] 555051, Intersil Corporation, “AP Developer’s Kit

Customization - User’s Manual”.

[11] AN1007, Intersil Corporation, “Introduction to the Wireless

Distribution System (WDS) and Features”.

[12] 555029, Intersil Corporation, “Reference Manual APDK

Web Server Interface Design”. Further information can be found in the following: uClinux homepage: http://www.uclinux.org/

PRISM® is a registered trademark of Intersil Americas Inc. PRISM and design is a trademark of Intersil Americas Inc.

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

| Intersil (and design) is a registered trademark of Intersil Americas Inc.

ISL36356A-APDK

Absolute Maximum Ratings Operating Conditions

Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7.5V (Max)

Storage Temperature (Note 1) . . . . . . . . . . . . . . . . . . -20

Caution: These are the absolute maximum ratings for the product. Exceeding these limits could cause permanent damage to the AP.

NOTE:

1. All temperature references refer to ambient conditions.

C to 85oC

Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . .0

Supply Voltage Range. . . . . . . . . . . . . . . . . . . . . . . . . . 4.5V to 5.5V

C ≤ TA ≤ 50oC

Electrical Specifications Test Conditions: Supply Voltage (V

Unless Otherwise Specified

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS

CURRENT CONSUMPTION

Initialization Current I Continuous Transmit Mode I Continuous Receive Mode I

RF SYSTEM SPECIFICATIONS

Transmitter Power Output P Receive Sensitivity RX_S 1Mbps, BER 8 E-5 - -93

Multipath Delay Spread using Naftali model

DELAY

Receiving Valid Packets - 516 - mA

out

2Mbps,BER 8 E-5 - -89

5.5Mbps,BER 8 E-5 - -87

11Mbps, BER 8 E-5 - -83

2Mbps,BER 8 E-5 - >290 - ns

5.5Mbps, BER 8 E-5 - 200 - ns

) = 5V, Ambient Temperature (TA) = 25oC,

- 517 - mA

- 670 - mA

14.8 16.2 17.0 dBm

(Note 2)

-dBm

11Mbps, BER 8 E-5 - 105 - ns Maximum Receive Level RX_MAX BER 8 E-5 -3 >2 - dBm Third Order Intercept Point (Input) IIP3_90 -90 dBm input - -3 - dBm

IIP3_25 -25 dBm input - +20 - dBm Carrier Suppression TX_sup Test Mode - 43 - dB Image Rejection IR BER 8E-5 - 65 - dB IF Rejection IFR BER 8E-5 60 66 - dB Adjacent Channel Rejection (Note 3) ACR BER 8E-5 - 35 - dB Data Rate (Physical Layer) Rate - 1, 2, 5.5

and 11

NOTES:

2. Measurements done on antenna port 1. Antenna port 2, 1 to 2 dB better performance.

3. The adjacent channel measurement is carried out on two antennas separated by 25MHz (five channels). The -70dBm desired signal and variable strength jammer are both 11Mbps DSSS data transmissions. The jammer is a continuous waveform with -40dBc first sidelobes.

- Mbps

ISL36356A-APDK

Functional Overview

The WLAN Access Point is designed to operate in the

2.4GHz ISM frequency band, channels 1 to 11, as specified by the FCC in the USA. The AP will also operate on channels 12 through 14, where permitted by local regulatory authorities. Radio equipment must be certified in a country prior to use. Refer to Table 4 for a list of countries and agencies that have approved the ISL36356A-APDK for operation.

The Intersil PRISM II Chip Set allows for high level integration; providing reduced size, increased throughput, improved radio performance and faster time to market. The WLAN Access Point implements Direct Sequence Spread Spectrum DSSS technology that provides superior noise and signal jamming immunity; including less severe impact from unintentional radiators such as microwave ovens. By using an Access Point, the wireless LAN can be set up to allow an even greater number of users to interconnect, and to increase the coverage area. The wireless LAN can be easily connected into an existing wired LAN, allowing for easy expansion of the service.

The ISL3856 Media Access Controller (MAC) Protocol Handler

The ISL3856 ARM940 based MAC Processor and the MAC Virtual Coprocessor (MVC) firmware are responsible for running the IEEE802.11 protocol in the WLAN AP. The MVC acts as a software emulated coprocessor to the ARM940 and runs completely separated from the operating system. It provides an abstraction layer of the underlying hardware to the operating system via a well-defined interface.

The MVC supports the following 802.11 functions:

• CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) with Random Backoff

• WEP Security

• Short/Long Preamble with multirate

• RTS/CTS Handshake (Ready To Send/Clear To Send)

• MAC Level Acknowledgments (Media Access Control)

• Re-Transmission of Unacknowledged Frames

• Duplicate Detection and Rejection

• Broadcast and Multicast Frames

• Fragmentation and Re-Assembly

• Supports clients Power save mode

extensible platform for f eature dev elopment. Due to the large availability of different Linux based applications in the Open Source community, it is easy to add new features to the AP, reducing time to market.

A special embedded version of the Linux operating system, uClinux, is running on the ISL3856. It is tailored to run on the ARM940 processor and optimized for size. The uClinux Application Programmers Interface (API) is the same as the standard Linux API. The ISL36356A platform offers the following basic functions:

• DHCP client/server

• Configuration via Web Interface and SNMP

• Simple and Failsafe Firmware Upgrade via Web Interface

• Wi-Fi Protected Access (WPA)

•802.1x Security

• Wireless Distribution System

• Routing, NAPT and firewall support

• PPPoE

• VPN Passthrough (PPTP)

• 802.1d Spanning Tree Protocol (STP) Adding features to the development platform can be done by

taking applications that are available in the Open Source community and port them to the platform. Porting documentation is available to assist in this task. Applications can also be made from scratch, so they can be kept closed source.

The table below lists the resources that are available for adding new applications to the basic design. In normal operation, approximately 50% of the processor cycles of the ARM940 are consumed by the MVC. The remaining capacity is available for Linux and the applications. Because all applications are stored in Flash in a compressed format, the available Flash is calculated for both compressed and uncompressed files.

TABLE 2. AVAILABLE RESOURCES

AVAILABLE FLASH

MEMORY

CONFIGURATION

2Mbyte Flash 8Mbyte RAM

4Mbyte Flash 16Mbyte RAM

AVAILABLE

RAM

~1.2Mbyte ~16kbyte / 32kbyte

~9.2Mbyte ~2.0Mbyte / 4.0Mbyte

(COMPRESSED /

UNCOMPRESSED)

• Timestamp Synchronization

• DCF (Distributed Coordination Function)

The Linux Operating System

The ARM940 based MAC processor hosts a complete Open Source Linux operating system, offering a flexible and

For starting development on the Linux based platform, a complete dev e l o pment environment is shipped with th e product, including documentation describing the setup of a development system.

The complete hardware and software of the system are pretested which ensures a stable development platform.

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