PUKGEM3501Core Engine, PCS-1900 GSM Radio Module

© 2001 Xircom, Inc., an Intel company All rights reserved. All trademarks and copyrights are the property of Xircom, Inc., an Intel company Core Engine (PCS 1900) GSM Wireless Terminal Approvals Guide (Preliminary Draft – 7/6/2001) C C o o n n f f i i d d e e n n t t i i a a l l Core Engine Approvals Guide Preliminary Draft: 07/06/01 2 Part Number: 07100029, Revision: 002 Confidential © 2001 Xircom, Inc., an Intel company All rights reserved. All trademarks and copyrights are the property of Xircom, Inc., an Intel company 1 1 I I M M P P O O R R T T A A N N T T I I N N F F O O R R M M A A T T I I O O N N 1.1 Revision History Date Revision Description 3/21/01 001 Initial draft revision for internal review (preliminary). 7/6/01 002 Revised In: Customer Device Approvals Section North American Homologation Radio Approvals Section Added In: Customer Device Approvals Section North American Homologation RF Exposure – SAR Miscellaneous Approvals Section 255 Compliance E911 Compliance Leveraging Modular Approvals Section PTCRB Approval and IMEI Assignment Xircom Assistance with Approvals Section Miscellaneous Items Audio Testing Integration Testing Added Section: 4.5 Labeling and Documentation Requirements Remove all references to Dual-Band 900/1800 1.2 Disclaimer Xircom, Inc., an Intel company (hereafter “Xircom”) shall not be liable for consequential or incidental damages, injury to any person or property, anticipated or lost profits, loss of time, or other losses incurred by Customer or any third party in connection with the implementation of the Protocol or Customer's failure to comply with the information and instructions contained herein. The information in this document is preliminary and subject to change by Xircom. Core Engine Approvals Guide Preliminary Draft: 07/06/01 3 Part Number: 07100029, Revision: 002 Confidential © 2001 Xircom, Inc., an Intel company All rights reserved. All trademarks and copyrights are the property of Xircom, Inc., an Intel company T T A A B B L L E E O O F F C C O O N N T T E E N N T T S S 1 IMPORTANT INFORMATION....................................................................................................... 2 1.1 Revision History ............................................................................................................................ 2 1.2 Disclaimer ..................................................................................................................................... 2 2 APPROVALS OVERVIEW ...........................................................................................................5 2.1 Scope of This Document ............................................................................................................... 5 2.1.1 GSM FTA Testing .................................................................................................................. 5 2.1.2 North American Homologation ...............................................................................................5 2.2 References.................................................................................................................................... 5 3 CORE ENGINE MODULAR APPROVALS................................................................................... 7 3.1 GSM FTA Testing.......................................................................................................................... 7 3.2 North American (United States and Canada) Homologation .......................................................... 7 3.2.1 Radio Approvals .................................................................................................................... 7 3.2.2 Product Safety ....................................................................................................................... 8 3.2.3 Electromagnetic Compatibility (EMC)..................................................................................... 8 4 CUSTOMER DEVICE SYSTEM APPROVALS ............................................................................ 9 4.1 Type Approval ............................................................................................................................... 9 4.2 North America (United States and Canada) Homologation ............................................................ 9 4.2.1 Radio Approvals .................................................................................................................... 9 4.2.2 Product Safety ....................................................................................................................... 9 4.2.3 Electromagnetic Compatibility (EMC)................................................................................... 10 4.2.4 RF Exposure - SAR ............................................................................................................. 10 4.3 Miscellaneous Approvals ............................................................................................................. 10 4.3.1 Section 255 Compliance ...................................................................................................... 10 4.3.2 E911 Compliance ................................................................................................................ 10 4.4 Labeling and Documentation Requirements ................................................................................ 11 4.4.1 Instructions to Manufacturer of the End Device Incorporating the Core Engine.................... 11 4.4.2 Responsibilities of the Manufacturer of the End Device Incorporating the Core Engine in a Fixed or Mobile Application........................................................................................................... 12 4.4.3 Specific Responsibilities for Portable Products and Applications.......................................... 13 4.4.4 Specific Responsibilities for Mobile Products and Applications ....................................…

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© 2001 Xircom, Inc., an Intel company All rights reserved. All trademarks and copyrights are the property of Xircom, Inc., an Intel company Core Engine GSM/GPRS Wireless Terminal Developer Guide (Preliminary Draft – 7/6/2001) C C o o n n f f i i d d e e n n t t i i a a l l Core Engine GSM/GPRS Modem Developer Guide Preliminary Draft: 7/6/2001 2 Part Number: 07100026, Revision: 002 Confidential © 2001 Xircom, Inc., an Intel company All rights reserved. All trademarks and copyrights are the property of Xircom, Inc., an Intel company 1 1 R R E E V V I I S S I I O O N N H H I I S S T T O O R R Y Y Date Revision Description 3/20/01 001 Initial revision (preliminary). 7/6/01 002 Added Core Engine RF antenna connector information. Added information on antenna design considerations. Added Core Engine 60-pin I/O connector pin-out information. Updated Carrier Board section for Rev B carrier board. Updated information in Detailed Specifications section. Removed reference to dual-band 900/1800 version. Added the following new sections: - Power (requirements; management; etc.). - Serial communications (single vs dual ports, XGAP, etc.). - Audio (mic & speaker interface; audio path selection; cabling; etc.). - Updating the Core Engine firmware. Core Engine GSM/GPRS Modem Developer Guide Preliminary Draft: 7/6/2001 3 Part Number: 07100026, Revision: 002 Confidential © 2001 Xircom, Inc., an Intel company All rights reserved. All trademarks and copyrights are the property of Xircom, Inc., an Intel company 2 2 S S A A F F E E T T Y Y P P R R E E C C A A U U T T I I O O N N S S 2.1 Important Safety Information Some of the following information may not apply to all devices described in this manual. However, precautions should be observed when handling any electrical device. ! Save this manual, it contains important safety information and operating instructions. ! Do not expose the Core Engine product to open flames. ! Care should be taken so that liquids do not spill into the devices. ! A qualified electrician should perform all primary connections to AC power. ! Do not attempt to disassemble the product. Doing so will void the warranty. With the exception of Subscriber Identification Modules (SIM), this product does not contain consumer serviceable components. 2.2 Guidelines for Limiting RF Exposure The Core Engine products are GSM radio transceivers. The following installation and operation restrictions apply to the all Core Engine products: ! A separation distance of at least 20 cm (7 7/8) inches between the antenna and body of the user and other persons must be maintained at all times ! In FIXED applications using a 1900Mhz Core Engine antenna gain* is limited to a maximum of 7 dBi, with a corresponding equivalent isotropic radiated power (EIRP) of 37 dBm / 5 W ! In MOBILE applications using a 1900Mhz Core Engine antenna gain* is limited to a maximum of 3 dBi, with a corresponding equivalent isotropic radiated power (EIRP) of 33 dBm / 3 W ! Desktop and other uses of these devices where the antenna can easily be relocated are considered by the FCC to be mobile applications. * Antenna gain is defined as gain in dBi (dB referenced to an isotropic radiator) minus cabling loss. NOTE: Additional care must be taken by the installer and/or user of the Core Engine products to ensure proper antenna selection and installation. Adherence to the above conditions is necessary to comply with FCC requirements for safe operation regarding exposure to RF radiation. 2.3 Disclaimer The information and instructions contained within this publication comply with all FCC, NRLT, IMEI and other applicable codes in effect at the time of publication. Xircom, Inc. disclaims all responsibility for any act, or breach of law, code or regulation, including local or state codes, performed by a third party. Core Engine GSM/GPRS Modem Developer Guide Preliminary Draft: 7/6/2001 4 Part Number: 07100026, Revision: 002 Confidential © 2001 Xircom, Inc., an Intel company All rights reserved. All trademarks and copyrights are the property of Xircom, Inc., an Intel company Xircom, Inc., an Intel company (hereafter “Xircom”) strongly recommends that all installations, hookups, transmissions, etc. be performed by persons who are experienced in the fields of radio frequency technologies. Xircom acknowledges that the installation, setup and transmission guidelines contained within this publication are guidelines, and that each installation may have variables outside of the guidelines contained herein. Said variables must be taken into consideration when installing or using the product, and Xircom, Inc. shall not be responsible for installations or transmissions that fall outside of the parameters set forth in this publication. Xircom shall not be liable for consequential or incidental damages, injury to any person or property, anticipated or lost profits, loss of time, or other losses incurred by Customer or any third party in connection with the installation of the Products or Customer's failure to comply with the information and instructions contained herein. 2.4 Beta Release Notes The information in this document is preliminary and subject to change by Xircom. 2.4.1 Data Services The current software release does not support USSD or Group 3 Fax. These services will be added in subsequent versions. 2.4.2 AT Commands The current software version may not support all AT commands listed in this document. Please reference the Core Engine Programmer Reference document for details of the software AT command implementation. 2.4.3 PUK Procedure The PUK procedure outlined in this document will be changing. Core Engine GSM/GPRS Modem Developer Guide Preliminary Draft: 7/6/2001 5 Part Number: 07100026, Revision: 002 Confidential © 2001 Xircom, Inc., an Intel company All rights reserved. All trademarks and copyrights are the property of Xircom, Inc., an Intel company T T A A B B L L E E O O F F C C O O N N T T E E N N T T S S 1 REVISION HISTORY ...............…

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Xircom, Inc.Attestation FCC ID: PUKGEM3501Page 1 of 1 Xircom Wireless Technology Group ATTESTATION OF COMPLIANCE TESTING The Xircom, Inc., an Intel company (formally known as Omnipoint Technologies and here after referred to as Xircom, Inc.), Core Engine 1900 MHz GSM Radio Module, FCC ID: PUKGEM3501, has been tested to and found compliant with the requirements of the Federal Communications Commission (FCC) for receipt of a CERTIFICATION grant of equipment authorization. The FCC regulations applicable to this device are 47 CFR Part 2, Subpart J, which details equipment authorization procedures, and 47 CFR Part 24, Subpart E, which sets out the regulations governing broadband personal communications services (PCS) operating in the 1850- 1910 and 1930-1990 MHz bands. All testing was performed using measurement procedures and practices consistent with the aforementioned regulations and with industry standards. Each unit manufactured and marketed will conform to the sample tested. Furthermore, the data reported in this filing is representative of the equipment being produced, within the variations that can be expected due to quantity production and testing on a statistical basis. To the best of our knowledge, we certify that the facts set forth in this document and the accompanying technical data are true and correct. We further certify that the measurements described in this document were performed under our direction and supervision at the following locations: Xircom, Inc., an Intel company (Formerly Omnipoint Technologies, Inc.) 1357 Garden of the Gods Road Colorado Springs, CO 80907 Criterion Technology(Radiated Spurious Emissions) 1350 Country Road 16 Rollinsville, CO 80474 NAME:Kelly RogersJames Youngman COMPANY:Xircom, IncXircom, Inc TITLE:Compliance EngineerCompliance Technical Lead SIGNED:____________________________________________________ DATE:August 31, 2001August 31, 2001

1357 Garden of the Gods Colorado Springs, CO 80907 719.548.1200 719.548.1393 Fax August 31, 2001 Federal Communications Commission Equipment Authorization Division Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21046 ATTN:Mr. Andy Le i me r RE:Certification Application for FCC ID: PUKGEM3501 Dear Andy, In fulfillment of the requirements to obtain a CERTIFICATION grant of equipment authorization for equipment operating under 47 CFR Part 24, Subpart E--Broadband PCS, Xircom, Inc., an Intel company [formerly Omnipoint Technologies, Inc. (OTI)] respectfully submits for your consideration the attached filing for FCC ID: PUKGEM3501. Included in this electronic submittal are Form 731, Application for Equipment Authorization; Form 159, Remittance Advice and payment in the amount of $640.00; and the documentation and technical information required by 47 CFR Part 2, Subpart J--Equipment Authorization Procedures, Section 2.1033 Application for Certification. Pursuant to Section 0.459 of the Commission's Rules, Xircom respectfully requests confidentiality for the following exhibits, and that they be withheld from public inspection at the conclusion of the authorization process: Exhibit 4Tune-Up Procedure Exhibit 5Schematic Diagrams These exhibits contain material considered to be trade secrets of Xircom and, as considerable effort has been expended in the development of this product, it is imperative that our competitors do not receive an unfair advantage in the marketplace at the expense of Xircom. Should you require any further or additional information to process this application, please do not hesitate to contact me directly. I can be reached by any of the following means: Telephone:(719) 884-2405 Fax::(719) 548-9812 email:[email protected] Sincerely, Kelly Rogers Compliance Engineer Xircom, Inc.

1357 Garden of the Gods Colorado Springs, CO 80907 719.548.1200 719.548.1393 Fax November 26, 2001 Federal Communications Commission Equipment Authorization Division Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21046 ATTN:Mr. Stan Lyles RE:Certification Application for FCC ID: PUKGEM3501 Dear Stan, In fulfillment of the requirements to obtain a CERTIFICATION grant of equipment authorization for equipment operating under 47 CFR Part 24, Subpart E--Broadband PCS, Xircom, Inc., an Intel company [formerly Omnipoint Technologies, Inc. (OTI)] respectfully submits for your consideration the attached filing for FCC ID: PUKGEM3501. Included in this electronic submittal are Form 731, Application for Equipment Authorization; Form 159, Remittance Advice and payment in the amount of $640.00; and the documentation and technical information required by 47 CFR Part 2, Subpart J--Equipment Authorization Procedures, Section 2.1033 Application for Certification. Pursuant to Section 0.459 of the Commission's Rules, Xircom respectfully requests confidentiality for the following exhibits (name given in quotes is the description of the file as uploaded to the electronic filing sytsem), and that they be withheld from public inspection at the conclusion of the authorization process: Exhibit 4Block Diagram (“Overall Block Diagram”) Exhibit 4Tune-Up Procedure (“Tune Up Procedure”) Exhibit 5Schematic Diagrams (“Complete Schematic Diagram Package”) These exhibits contain material considered to be trade secrets of Xircom and, as considerable effort has been expended in the development of this product, it is imperative that our competitors do not receive an unfair advantage in the marketplace at the expense of Xircom. Should you require any further or additional information to process this application, please do not hesitate to contact me directly. I can be reached by any of the following means: Telephone:(719) 884-2751 Fax:(719) 548-9812 email:[email protected] Sincerely, /JAMES YOUNGMAN/ James Youngman Staff Engineer, Regulatory and Compliance Xircom WWO, An Intel Company

Xircom, Inc.Exhibit 7 FCC ID: PUKGEM3501Page 1 of 1 Xircom, an Intel company EXHIBIT 7 FCC LABELING INFORMATION As required by § 2.1033(c)(11), this exhibit details the FCC Identifier label and its placement on the Core Engine GSM Radio Module. A drawing representative of the actual FCC Identifier label is shown in Figure E7.1; the label itself will be permanently affixed to the Core Engine as shown in the photo presented as Figure E7.2. Figure E7.1 Core Engine Regulatory / FCC label. Figure E7.2. Photograph of Core Engine showing Regulatory / FCC label placement. FCCID: PUKGEM3501

Xircom, Inc.Exhibit 8 FCC ID: PUKGEM3501Page 1 of 5 Xircom, an Intel company EXHIBIT 8 EQUIPMENT PHOTOGRAPHS This exhibit contains a series of digital photographs, as required by § 2.1033(c)(12) which reveal equipment construction and layout, including internal views showing component placement and chassis assembly. Table E18.1. Equipment photographs—photo numbers and description. Photo Number Description 1Top of Core Engine 1900 GSM Radio Module (shields removed) 2Bottom of Core Engine1900 GSM Radio Module (shields removed) 3Top of Core Engine1900 GSM Radio Module (shields in place) 4Bottom of Core Engine1900 GSM Radio Module (shields in place) Xircom, Inc.Exhibit 8 FCC ID: PUKGEM3501Page 2 of 5 Xircom, an Intel company Photo 1. Top of Core Engine PCB (shields removed). Xircom, Inc.Exhibit 8 FCC ID: PUKGEM3501Page 3 of 5 Xircom, an Intel company Photo 2. Bottom of Core Engine PCB (shields removed). Xircom, Inc.Exhibit 8 FCC ID: PUKGEM3501Page 4 of 5 Xircom, an Intel company Photo 3. Top of Core Engine (shields in place). Xircom, Inc.Exhibit 8 FCC ID: PUKGEM3501Page 5 of 5 Xircom, an Intel company Photo 4. Bottom of Core Engine (shield in place).

Xircom, Inc.List of Exhibits FCC ID: PUKGEM3501Page 1 of 1 Xircom, an Intel company LIST OF EXHIBITS EXHIBIT47 CFR §§CONTENTS 1:2.1033(a) & (c)General Information for Certification 2:2.1033(c)(3)/24.52Installation and Instruction Manual including Human Exposure Compliance Statement 3:2.1033(c)(8)DC Voltages Applied to and Currents into Final Amplifying Device *4:2.1033(c)(9)Tune-up Procedure *5:2.1033(c)(10)Schematic Diagrams 6:2.1033(c)(10)Means for Determining and Stabilizing Frequency, Suppression of Spurious Radiation, Limiting Modulation, and Limiting Power 7:2.1033(c)(11)FCC Labeling Information 8:2.1033(c)(12)Equipment Photographs 9:2.1033(c)(13)Detailed Description of Modulation System 10:2.1033(c)(14)General Measurement Information 11:2.1046/24.232(a)RF Output Power Measurements 12:2.1049Occupied Bandwidth Measurements 13:2.1051/24.238(a)Conducted Spurious Emissions Measurements 14:2.1053Radiated Spurious Emissions Measurements 15:2.1055/24.235Frequency Stability Measurements * = Exhibit filed confidentially with the FCC Xircom, Inc.Exhibit 1 FCC ID: PUKGEM3501Page 1 of 5 Xircom, an Intel company EXHIBIT 1 GENERAL INFORMATION FOR CERTIFICATION The information provided in this exhibit is submitted in response to the requirements of § 2.1033 Application for a certification grant of equipment authorization. General Description of Equipment (Informative) The Xircom, Inc. [formerly Omnipoint Technologies, Inc. (OTI)] Core Engine 1900 MHz GSM Radio Module, FCC ID: PUKGEM3501 , here after referred to as the Core Engine, is an RF transceiver which operates under the authority of Part 24, Subpart E--Broadband PCS--of the FCC Rules and Regulations. Furthermore, the Core Engine complies with all applicable national and international GSM standards including, for example, J-STD-007, PCS Air Interface Specification (PCS-1900), and the current family of ETSI (European Telecommunications Standards Institute) standards for GSM 900/1800/1900 MHz Phase 2 terminals. As a wireless data terminal, the Core Engine permits access to the Global System for Mobility, or GSM, network, and ultimately the Public Switched Telephone Network (PSTN) and the internet. The Core Engine will enable a variety of fixed and mobile wireless data applications including Automated Meter Reading (AMR), alarm monitoring, telematics, e-mail and internet access. These types of PCS applications were made possible by the FCC's adoption in June 1996 of rules permitting flexible service offerings in the commercial mobile radio services (WT Docket No. 96-6, FCC 96-83, "Amendment of the Commission's Rules to Permit Flexible Service Offerings in the Commercial Mobile Radio Services, First Report and Order and Further Notice of Proposed Rulemaking," released August 1, 1996, ¶ 29). The Commission's ruling in this proceeding concluded that fixed services, such as those made possible by the Core Engine, are permissible service offerings on spectrum allocated for broadband PCS. This ruling is codified in § 24.3 which states “PCS licensees may provide any mobile communications service on their assigned spectrum. Fixed services may be provided on a co-primary basis with mobile operations.” An overview of Core Engine deployment in a GSM network is shown in Figure E1.1. Functional capabilities of the Core Engine include voice, circuit switched data up to 9.6 kpbs, and other GSM services for transmitting and receiving data (Short Message Service—SMS, Unstructured Supplementary Service Data—USSD and General Packet Radio Service—GPRS). The Core Engine operates over a wide temperature range (-30°C to +55°C) with a fixed DC input voltage of +3.7 VDC +/- 0.5 VDC. Connection to and communication with the host application is via a sixty pin molded connector; RF interface is through a mini GSC connector. Physically, the EUT consists of a single printed circuit board (PCB) of approximate dimensions 2.09" x 1.37" which is completely encased by top and bottom single-piece metal shields snapped in place onto a fence apparatus soldered to the PCB. Xircom, Inc.Exhibit 1 FCC ID: PUKGEM3501Page 2 of 5 Xircom, an Intel company Cus tom Application Core EngineCustom Packaging GSM/GPRS Radio Base Station Transceiver Base Station ControllerMobile Switching Center Pack et C ont rol Unit GSM Serving GPRS Support Node GPRS IP Backbone Gateway GPRS Support Node External IP Net work (E.g. Internet) Interworking Function Short Message Service Center Public Switched Telephone Net work Modem Int ernet Application Server Figure E1.1. Core Engine Deployment in a GSM/GPRS Network. Section 2.1033(a)Application for certification A completed FCC Form 731 “Application for Equipment Authorization” accompanies this document, both of which have been filed electronically. Section 2.1033(c)(1)Name of Applicant Applicant:Xircom, Inc., an Intel company 1357 Garden of the Gods Road Colorado Springs, CO 80907 Manufacturer:Siemens Energy & Automation, Inc. 3000 Bill Garland Road Johnson City, TN 37601 Siemens Energy & Automation is a contract manufacturer and will be the final manufacturer of the equipment described in this application. Section 2.1033(c)(2)Equipment Identification and FCC Identifier Product Name:Core Engine1900 MHz GSM Radio Module Model Number:GEM3501 FCC ID: PUKGEM3501 Section 2.1033(c)(3)Core Engine Technical Specification Xircom, Inc.Exhibit 1 FCC ID: PUKGEM3501Page 3 of 5 Xircom, an Intel company Refer to Exhibit 2. Included is a statement affirming that the Core Engine complies with current FCC requirements addressing human exposure to radiofrequency radiation, pursuant to the requirements of § 24.52. Section 2.1033(c)(4)Type of Emission (Emissions Designator) Emissions Designator: 250KGXW The maximum measured occupied bandwidth of the signal transmitted by the Core Engine is 250 kHz and thus the sequence 250K was chosen as the first four characters of the emissions designator. The emissions classification of GXW was determined using the guidance p…

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Xircom, Inc.Exhibit 3 FCC ID: PUKGEM3501Page 1 of 1 Xircom, an Intel company `EXHIBIT 3 DC VOLTAGES AND CURRENTS INTO FINAL RADIO AMPLIFYING DEVICE As required by § 2.1033(c)(8), presented in Table E3.1 are the DC voltages applied to and the corresponding DC currents into the final RF power amplifier, over the entire range of nominal RF output powers that the Core Engine normally operates. Table E3.1. Final power amplifier—DC voltages and currents NominalFinal PA Output Power (dBm) Input Current (Amps) Input Voltage (Volts) 301.8052.869 281.4221.941 261.1021.941 240.8751.600 220.7111.313 200.6021.077 180.5150.883 160.4450.737 140.3980.613 120.3750.521 100.3520.451 80.3200.391 60.3050.343 40.2970.297 20.2810.263 00.2500.213

Xircom, Inc.Exhibit 6 FCC ID: PUKGEM3501Page 1 of 3 Xircom, an Intel company EXHIBIT 6 MEANS FOR DETERMINING AND STABILIZING FREQUENCY, SUPPRESSION OF SPURIOUS RADIATION, LIMITING MODULATION, AND LIMITING POWER As required by § 2.1033(c)(10), this exhibit details the methods employed to determine and stabilize frequency, suppress spurious radiation and to limit both modulation and power Means for Determining and Stabilizing Frequency No absolute frequency stability requirements are levied against broadband PCS equipment operating under the authority of Part 24, Subpart J. However, per § 24.235, the frequency stability of the equipment shall be sufficient to ensure that the fundamental emission stays within the authorized frequency block. Specifically, this is accomplished as follows: The transmit RF carrier of the Core Engine is generated by a voltage controlled oscillator (VCO) which is phase locked to a 13 MHz master reference source. This 13 MHz source is synchronized to the GSM network and, within the Core Engine, is controlled by an 11 bit DAC to keep the carrier to within ±0.1 ppm of the network reference. Measurements of the stability of the fundamental emission of the Core Engine over variations in temperature and input voltage are presented in Exhibit 15. As a GSM-compliant terminal, the stability of the Core Engine carrier is to be within ±0.1 ppm (±200 Hz in 2000 MHz) of the nominal value, in accordance with GSM performance requirements (see J-STD-007, Personal Communications Services, Air Interface Specification; Volume 1, Radio Path Physical Layer, Section 7.4.1). Means for Suppression of Spurious Radiation Suppression of spurious and harmonic radiation in the Core Engine is ensured through good engineering practices and proper transmitter design, lay-out, and construction. 1. Transmitter Architecture and Design • Frequency plan of the transmitter—local oscillator frequencies were selected to minimize spurious products. • Use of an upconversion loop architecture to minimize spurious and noise power level in the PCS1900 receive band (1930-1990 MHz). • Lowpass filtering within and prior to the T/R switch to further reduce harmonics. Xircom, Inc.Exhibit 6 FCC ID: PUKGEM3501Page 2 of 3 Xircom, an Intel company 2. Physical Realization of the Core Engine • Fully shielded GSM radio module construction with filtering on all signal (data, control, clock) and power supply leads. • Localized shielding over the GSM radio and digital/baseband sections. • Careful component placement and layout, multi-layer circuit board construction, microstrip signal routing, and construction techniques to eliminate cavity moding and resonances. Means for Limiting Modulation Per GSM specifications, the modulation scheme implemented by the Core Engine is Gaussian MSK (GMSK), with a bandwidth-time product of BT = 0.3. Modulation rate is 1625/6 kbps, or approximately 280.83 kbps. To minimize spreading of the spectrum, GSM standards require that the RF output spectrum meet the mask shown in Figure E6.1. In the Core Engine, modulation accuracy is maintained through the use of direct digital synthesis techniques. -70 -60 -50 -40 -30 -20 -10 0 10 0500100015002000 Frequency Offset from Carrier (kHz) Power Relative to Carrier in 30 kHz BW (dB) Figure E6.1. GSM terminal modulation mask. Xircom, Inc.Exhibit 6 FCC ID: PUKGEM3501Page 3 of 3 Xircom, an Intel company Means for Limiting Power As a GSM-compliant terminal, the Core Engine is capable of transmitting at any of the 16 defined nominal RF output power levels, ranging from 30.0 dBm to 0.0 dBm, during its assigned TDMA frame. Core Engine transmitter operation …

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