OSZ37300XUWireless LAN transmitter

1 TM File NumberFNXXXX 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 trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2001, All Rights Reserved PRELIMINARY ISL37300XU-EVAL PRISM 2.5 11Mbps Wireless Local Area Network USB Card The Intersil ISL37300XU WLAN USB- card is a complete wireless high speed Network Interface Card (NIC) utilizing the Intersil PRISM® 2.5 Direct Sequence Spread Spectrum Wireless Transceiver chip set. It provides a complete PRISM 2.5 reference design evaluation platform of hardware and software to system providers or integrators requiring wireless data communications capability and is ideal for integration into computer platforms. The Evaluation kit (ISL37300XU-EVAL) includes two WLAN USB-cards designed to Intersil’s Prism reference design, Microsoft Windows® Driver, Local Area Network evaluation software, Prism Test Utilities (PTU) (note 1) software and documentation to complete the evaluation. It supports the IEEE 802.11b network specification for Direct Sequence Spread spectrum DSSS signaling, providing data rates of 1, 2, 5.5, and 11 Mbps. Evaluation kit software updates are available on the Intersil Web Site. In addition to the evaluation kit, a complete PRISM chipset WLAN reference design package (ISL37300XU-CD) is available. It contains all the documentation needed for manufacturing of the Prism 2.5 USB wireless network card including: Cadence/Allegro Layout, Gerber files, Concept schematic, Bill of Materials, assembly and mechanical drawings, test plan, and even a copy of the application for FCC equipment authorization. Customers who license the reference design also receive password access to FCC Intersil’s Premier Web site for up to the minute updates on hardware and software. Features • Certified Under Part 15 to Operate in 2.4GHz ISM Band (Approval Pending) • Support for 11, 5.5, 2 and 1 Megabit Per Second (Mbps) Data Rates • Supports the lEEE 802.11 Direct Sequence Specification • Driver Supports Microsoft® Windows® 95, 98, 98SE, 2000, NT and ME • Supports Dual Diversity Antennas • Advanced RAKE Receiver Design with Decision Feedback Equalizer combats multipath fading • Provides Wireless Data Communications at Full Ethernet Speed • Designed to Fully Support USB specification 1.1 Defined Mechanical and Environmental Stress Conditions • Intelligent Power Control, Including IEEE 802.11 Power Save Mode • Complete Reference Design, the ISL37300XU CD is available to ensure Minimum Time-to-Market NOTES: 1. At present, PTU supports Windows 95, 98 and 98SE. An upgrade is in process which will add support for NT. 2. The range will vary in different operating environments due to effects such as building construction Packaging Ordering Information PART NUMBERDESCRIPTIONCARDS / SET ISL37300XU-EVAL WLAN Evaluation Kit2 Data SheetSeptember 2001 tle jec ho w () ato CI ar e e O es C W ar 2 Access Points will be available from a number of suppliers, enabling a totally wireless network solution. Typical operating ranges are shown in Table 1.. Functional Overview The WLAN USB-Card is designed to operate in the 2.4GHz ISM frequency band, channels 1 to 11, as specified by the FCC in the USA. The card 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 ISL37300XU-EVAL for operation. The Intersil PRISM Chip Set allows for high level integration for reduced size, increased throughput, improved radio performance and faster time to market. The WLAN USB-card implements Direct Sequence Spread Spectrum DSSS technology providing superior noise and signal jamming immunity including less severe impact from unintentional radiators such as microwave ovens. The user can connect the USB-card in an ad-hoc peer to peer networking scheme, allowing for instant network setup in any office environment. By using an access point, the wireless LAN can be set up to allow for a greater number of users to interconnect, and to increase the coverage area. With a portal (i.e. Access Point), the wireless LAN can be easily connected into an existing wired LAN, allowing for easy expansion of the service. Compared to the PRISM II chip set, the PRISM 2.5 generation offers: •Low loss front end designed for maximum range •Higher level of chip integration and less peripheral components to reduce material costs •Support of optional IEEE 802.11 Short Preamble for significantly increased data throughput A complete Reference Design for the ISL37300XU is available to ensure minimum time-to-market. This information contains details for manufacturing a USB-card WLAN assembly, including Gerber PC board files, a Bill of Material with component sourcing, mechanical drawings, a detailed Radio Description with debug directions and a test plan. The ISL3873 Media Access Controller (MAC) Protocol Handler The ISL3873 MAC/Baseband Processor and its firmware are responsible for running the IEEE 802.11 protocol in the WLAN card. This section describes the features of IEEE 802.11 that are implemented. The functions supported by the STA (station) Firmware are: •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) and NAV Management (Network Allocation Vector) •MAC Level Acknowledgments (Media Access Control) •Re-Transmission of Unacknowledged Frames •Duplicate Detection and Rejection •Broadcast and Multicast Frames •Fragmentation and Re-Assembly •Power Management (Planned) •Timestamp Synchronization •DCF (Distributed Coordination Function) •Beacon Generation in an Ad-Hoc Network •Probe Response Generation in an Ad-Hoc Network Card Information Structure The standard Intersil WLAN USB-card will…

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Block diagram for ISL37300XU WLAN USB

www.intersil.com ING Bank: 65.02.63.049 Swift code: INGBNL2A VAT / BRW: NL8039.66.659.B.01 Chamber of Commerce Utrecht: 30139807 Date 22 October 2001 Your reference -- Our reference Mansup/ds/2001_141 Subject Request for Non disclosure (FCC ID: OSZ37300XU) Curtis-Straus LLC Attention: Certification Manager 527 Great Road Littleton, Massachusetts United States of America telephone: (978) 486-8880 fax: (978) 486-8828 Dear Certification manager, Persuant to 47 CFR Section 0.459, Intersil Corporation hereby requests non disclosure and confidential treatment of the following materials submitted in support of FCC certification application for FCC ID: OSZ37300XU: a. Schematic / Circuit diagrams b. Theory of operation c. Bill of Material d. PCB layout Above materials contain trade secrets, proprietary and technical information which would customarily be guarded from competitors under 47 CFR section 0.457(d)(2). Disclosure or publication of any portion of this company confidential material to other parties could cause substantial competitive harm and provide unjustified benefits for competitors. Intersil Corporation understands that pursuant to 47 CFR section 0.457(d)(1)(ii) disclosure of the applicant and all accompanying documentation will not be made before the date of the grant. Sincerely yours, Derick Sariredjo Intersil Corp. Telephone: +31 30 225 97 42 email: [email protected]

Hi Derick, We have completed our review and have identified the following issues: 1. Please provide the frequency range over which the device was examined for radiated emissions. 2. Please provide a theoretical explanation of the expected processing gain from the scheme used with the 11MB rate. Please provide a more detailed description of the test procedure used for acquiring the processing gain data. 3. Please tell us the instrument used to measure the conducted RF power output. If it was a spectrum analyzer, please tell us the resolution bandwidth used. 4. Please provide the antenna gain. 5. The manual does not have a RF exposure statement. Best regards Barry C. Quinlan Certification & Telecom Manager ------------------------------------------------------------------------------- Curtis-Straus LLC Voice: 978.486.8880 x270 527 Great Road Fax: 978.486.8828 Littleton, MA 01460 http://www.curtis-straus.com -------------------------------------------------------------------------------- Response – Hi Barry, Please find our response to your questions on OSZ37300XU below: 1. The frequency range is in accordance with section 15.33, to the tenth harmonic. The spectrum was investigated up to 26.5 GHz. 2. Please find additional processing gain information attached (addendum 1 to PG report). 3. The equipment used for the power measurement is: 99068 Wideband diode detector (with 6 dB input attenuator for accurate 50 ohm input impedance). 12559 Digital storage oscilloscope to measure the peak values. 13526 Signal generator to calibrate the wideband detector/oscilloscope test setup. 4.The antenna gain is 2dBi. 5. The RF exposure statement is located on the last page of the manual. See copy attached. Best regards, Derick Sariredjo Intersil Corp.

FCC ID: OSZ37300XU Page 1 of 2 External photographs of Description: 2.4 GHz USB WLAN FCC ID: OSZ37300XU Brand name: Intersil Model number: ISL37300XU FCC ID: OSZ37300XU Page 2 of 2 ISL37300XU exterior overview

FCC ID: OSZ37300XU Page 1 of 3 FCC label information Description: 2.4 GHz USB WLAN FCC ID: OSZ37300XU Brand name: Intersil Model number: ISL37300XU FCC ID: OSZ37300XU Page 2 of 3 ISL37300XU FCC label Label size: 4.8 x 7.3 mm Label material: Tamper evident 0.002" polyester. This material is durable, tamper proof and legible. Tamper proof: If the label is removed after 48 hours (time for the adhesive to cure) it will separate which will leave label material on the attached surface that it was removed from. This label material will spell out the word "VOID". The label will also show the word "VOID" where the label material was pulled away. The end result is the word " VOID " on both the mating surface and label, leaving both unusable. FCC ID: OSZ37300XU Page 3 of 3 ISL37300XU FCC label on cabinet

FCC ID: OSZ37300XU Page 1 of 7 Internal photographs of Description: 2.4 GHz USB WLAN FCC ID: OSZ37300XU Brand name: Intersil Model number: ISL37300XU FCC ID: OSZ37300XU Page 2 of 7 ISL37300XU exterior overview FCC ID: OSZ37300XU Page 3 of 7 ISL37300XU exterior front with label FCC ID: OSZ37300XU Page 4 of 7 ISL37300XU PCB front view with shields FCC ID: OSZ37300XU Page 5 of 7 ISL37300XU PCB front view without shields FCC ID: OSZ37300XU Page 6 of 7 ISL37300XU PCB Rear view with shields (RF) FCC ID: OSZ37300XU Page 7 of 7 ISL37300XU PCB Rear view without shields (RF)

FCC ID: OSZ37300XU 1 Engineering analysis of a low power DSSS spread spectrum Transceiver, Equipment description: 2.4GHz WLAN USB device Brand name: Intersil Model number: ISL37300XU FCC ID: OSZ37300XU According to requirements of : FCC part 15.247 (b) (4), FCC OET Bulletin 65 “Evaluating Compliance with FCC Guidelines for Human Exposure to Radio frequency Electromagnetic Fields “ and supplements A, B and C. Date: October 18, 2001 Author: D.S. Sariredjo, Intersil Corp. The Netherlands Rev: 1.0 FCC ID: OSZ37300XU 2 Introduction This engineering analysis was done according to FCC part 15.247 (b) (4) as part of the FCC certification requirements for spread spectrum devices. The measured EIRP values for the lowest, middle and highest TX channel were used for the MPE calculations based on FCC OET Bulletin 65 and supplements A, B, and C. These calculations were done in worst case mode, assuming 100% reflection of incoming radiation, resulting in a potential doubling of predicted field strength and a four-fold increase in (far-field equivalent) power density (S). EIRP S = 4πR 2 (power density without reflection) (2) 2 EIRP S = 4πR 2 (worst case power density with 100% reflection) with R = 20 cm (8 inches) Calculation results Table 1 below shows the Power density (S) results for the lowest, middle and highest TX channel: Measured EIRP (mW) Including antenna gain Calculated worst case Power Density S (mW/cm 2 ) Ch 1 Ch 6 Ch 11 Ch 1 Ch 6 Ch 11 105.0 107.4 91.4 0.084 0.085 0.073 Table 1: Power density (S) calculations Conclusion Based on these calculations and using the limits of the general population / uncontrolled environment (which is 1.0 mW/cm 2 at 2.4 GHz), the Intersil low power spread spectrum transceiver does not exceed the MPE requirements set forth in documents above, with a minimum safe distance between antenna and operator of 20 centimeters (8 inches). The equipment therefore fulfills the requirements on power density for general population / uncontrolled exposure and therefore complies with the requirements of FCC Part 15.247(b)(4) and FCC OET Bulletin 65 incl. supplements A, B, and C.

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FCC ID: OSZ37300XU FCC Processing Gain report of: Description: 2.4 GHz USB WLAN Brand name: Intersil Model number: ISL37300XU FCC ID: OSZ37300XU for -channel 1 at 11 Mbps -channel 6 at 1, 2, 5.5 and 11 Mbps -channel 11 at 11 Mbps Processing Gain ISL37300XU USB Card Data Rate 11Mb/sTest Conditions: Symbol rate 1.375Ms/sDesired Signal Es=-60dBm Modulation CCKCR9=80;CR10=C9;CR47=9E;CR35=7F; Theoretical required Es/No=16.4Calibration has been performed by using Gigatronic Power Meter in the MAP mode System Loss Lsys=2and the card was running in the Continous TX Mode in the PTTU. 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FCC ID: OSZ37300XU 1 Addendum 01 to FCC Processing Gain report of: Description: 2.4 GHz USB WLAN Brand name: Intersil Model number: ISL37300XU FCC ID: OSZ37300XU for -channel 1 at 11 Mbps -channel 6 at 1, 2, 5.5 and 11 Mbps -channel 11 at 11 Mbps By Carl Andren, Intersil Corp. FCC ID: OSZ37300XU 2 Table of contents Testing for compliance with FCC rules 15-247e........................................................................ 3 Scope ......................................................................................................................................... 3 Applicable Reference Documents. ............................................................................................ 3 Test Background and Procedure. .............................................................................................. 3 Theoretical calculations ............................................................................................................. 4 1000 byte PER vs. Es/No ...................................................................................................... 5 Test Configuration: CW Jamming Margin (15.247) (e) .............................................................. 7 Test Procedure ...................................................................................................................... 7 FCC ID: OSZ37300XU 3 Testing for compliance with FCC rules 15-247e Scope This report presents the test procedure, test configuration and test data associated with a FCC Part 15.247 (e) Jamming Margin test for the indirect measurement of processing gain. Applicable Reference Documents. 1. “Operation within the bands 902-928 MHz, 2400-2483.5, and 5725-5850 MHz” Title 47 Part 15 section 247 (e) Code of Federal Regulations. (47 CFR 15.247). 2. “Report and Order: Amendment of Parts 2 and 15 of the Commission’s Rules Regarding Spread Spectrum Transmitters. Appendix C: ‘Guidance on Measurements for Direct Sequence Spread Spectrum Systems” FCC 97-114. ET Docket No. 96-8, RM-8435, RM-8608, RM-8609. 3. “ISL3873B WLAN MAC controller with Direct Sequence Spread Spectrum Baseband Processor” Intersil Corporation Preliminary Data Sheet, Melbourne FL, September 2001. 4. “ M-ary Orthogonal Keying BER Curve”, Test Background and Procedure. According to FCC regulations [1], a direct sequence spread spectrum system must have a processing gain, G p of at least 10 dB. Compliance to this requirement can be shown by demonstrating a relative bit-error-ratio (BER) performance improvement (and corresponding signal to noise ratio per symbol improvement of at least 10 dB) between the case where spread spectrum processes (coding, modulation) are engaged relative to the processes being bypassed. In some practical systems, the spread spectrum processing cannot simply be bypassed. In these cases, the processing gain can be indirectly measured by a jamming margin test [2]. In accordance with the new NPRM 99-231, if the vendor has a system with less than 10 chips per symbol, the CW jamming results must be supported by a theoretical explanation of the system processing gain. FCC ID: OSZ37300XU 4 Theoretical calculations The processing gain is related to the jamming margin as follows [2]: system output p L S J N S G+       +       = Where BER REFERENCE is the reference bit error ratio with its corresponding, theoretical output signal to noise ratio per symbol, (S/N) output , (J/S) is the jamming margin (jamming signal power relative to desired signal power), and L system are the system implementation losses. The maximum allowed total system implementation loss is 2 dB. The ISL3873B direct sequence spread spectrum baseband processor uses CCK modulation which is a form of M-ary Orthogonal Keying. The BER performance curve is given by [5]: “ The probability of error for generalized M-ary Orthogonal signaling using coherent demodulation is given by: PPQz E z dz ec b M S N =− =−−+               −       − − ∞ ∫ 11 1 2 212 2 1 2 1 2 01 0 π η ()exp This integral cannot be solved in closed form, and numerical integration must be used. This is done in a MATHCAD environment and is displayed in graphical format. FCC ID: OSZ37300XU 5 1000 byte PER vs. Es/No 15.51616.517 10 -2 10 -1 10 0 11 Mbps CCK in Thermal Noise Es/No (dB) 1000 byte Packet Error Rate The reference PER is specified as 8% . The corresponding Es/No (signal to noise ratio per symbol) is 16.4 dB. The Es/No required to achieve the desired BER with maximum system implementation losses is 18.4 dB. The minimum processing gain is again, 10 dB, therefore: dB S J dBdBL S J N E G system output o s p 100.24.16≥       ++=+       +         = dB S J dBG p 104.18≥       += The minimum jammer to signal ratio is as follows: dB S J 4.8−≥       For the case of the ISL3873B, the bit rates are 1, 2, 5.5, and 11 Mbps. The corresponding symbol rates are 1, 1, 1.375, and 1.375 MSps. The chip rate is always 11 MCps, so the ratio of chip rate to symbol rate is 11:1 for the 1 and 2 Mbps rates and 8:1 for t…

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