PKLWBG-2100Bluegate 2100

Wireless Internet and Data Communication 9645 Scranton Road, Suite 205 San Diego, CA 92121 Phone: 858.453.8400 Fax: 858.453.5735 Email Technical Support: [email protected] Information: [email protected] BlueGate 2100 Administrator’s Guide July 26, 2001 Document Number: BG2100-PROJ-UM-010501-0619 Version: 1.4 Confidential and Proprietary Information BlueGate 2100 July 26, 2001 WIDCOMM, Inc., Proprietary and Confidential i FCC STATEMENT WIDCOMM, Inc., 9645 Scranton Road, Suite 205, San Diego, CA 92121, 858-453-8400. BlueGate, PKLWBG-2100. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and, (2) This device must accept any interference received including interference that may cause undesired operation. Per CFR 47, PART 15, Paragraph 15.21: User changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate the equipment. Application PKLWBG-2100 Additional Information for the FCC approval of Widcomm Inc.’s BlueGate 2100 RF Exposure Statement IMPORTANT NOTE: To meet FCC RF exposure compliance requirements the following antenna installation and device operating configurations must be satisfied: BlueGate 2100 must be wall or ceiling mounted or placed on a surface such that a minimum normal operating distance of 20 centimeters is maintained from the human body at all times. LICENSED SOFTWARE © Copyright 2000 – 2001, WIDCOMM, Inc. (“WIDCOMM”). All rights reserved. Warning: Copyright law and international treaties protect this software and accompanying documentation. Unauthorized reproduction or distribution of this software, or any portion of it, may result in severe civil and criminal penalties, and will be prosecuted to the maximum extent possible under the law. Use of this software is governed by the terms of the end user license agreement that accompanies or is included with such software. Unless otherwise noted in the end user license agreement, or herein, no part of the documentation accompanying this software, whether provided in printed or electronic form may be reproduced in any form, or stored in a database or retrieval system, or transmitted in any form or by any means, or used to make any derivative work (such as translation, transformation, or adaptation) without the express, prior written consent of WIDCOMM. Trademark(s) ™, Service Mark(s) SM, and Registered Trademark(s) ® WIDCOMM, the WIDCOMM logo, and BlueGate are trademarks of WIDCOMM, Inc. Bluetooth and the Bluetooth logos are trademarks owned by Bluetooth SIG, Inc., U.S.A. and licensed to WIDCOMM, Inc. Netscape is a registered trademark of Netscape Communications Corporation in the U.S. and other countries. Navigator is also a trademark of Netscape Communications Corporation and may be registered outside the U.S. Other brand and product names may be registered trademarks, service marks, or trademarks of their respective holders. BlueGate 2100 Table of Contents July 26, 2001 WIDCOMM, Inc., Proprietary and Confidential ii Table of Contents 1 INTRODUCTION.................................................................................................... 1 2 KIT CONTENTS...................................................................................................... 2 3 INSTALLATION..................................................................................................... 3 3.1 POWER CORD AND ETHERNET CABLE INSTALLATION..................................................... 3 3.2 WALL OR CEILING INSTALLATION................................................................................. 4 4 RESET BLUEGATE 2100........................................................................................ 5 5 FIND BLUEGATE 2100’S IP ADDRESS.................................................................. 6 5.1 IP ADDRESS IN A DHCP ENVIRONMENT........................................................................ 6 5.2 IP ADDRESS IN A NON-DHCP ENVIRONMENT............................................................... 7 6 ACCESS THE INTERNAL WEB SERVER.............................................................. 8 6.1 IN A DHCP ENVIRONMENT............................................................................................ 8 6.2 IN A NON-DHCP (PRIVATE NETWORK) ENVIRONMENT.................................................... 9 7 USER INTERFACE............................................................................................... 10 7.1 HOME PAGE................................................................................................................ 10 7.2 CONFIGURATION......................................................................................................... 11 7.2.1 Identity........................................................................................................ 12 7.2.2 Network Settings.......................................................................................... 13 7.2.3 Network Address Translation (NAT).............................................................. 14 7.2.4 Point-to-Multipoint....................................................................................... 14 7.2.5 Authorization................................................................................................ 15 7.2.6 Authentication.............................................................................................. 16 7.2.7 Simple Network Management Protocol (SNMP).............................................. 17 7.2.8 Login........................................................................................................... 18 7.3 UTILITIES................................................................................................................... 19 7.3.1 Command Line............................................................................................. 19 7.3.2 Ping.......…

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BlueGate 2100 Mounting Instructions & Template Screw Anchor in here Screw Anchor in here BlueGate 2100 should be mounted on the ceiling or wall to achieve maximum performance. See the Start Here guide for help in setting up BlueGate 2100 Choose a location at least 20 centimeters (8 inches) from normal human contact. Tape this template to  the installation location and use a nail or other  small pointed object to mark the locations of the screw anchors. Remove the template and install the included screw anchors with a #2 Phillips screwdriver. Insert the power and Ethernet cables  into their respective jacks on  BlueGate 2100. Use the included Phillips-head screws to secure BlueGate 2100 to the screw anchors. © WIDCOMM, Inc 2001 PN: 100233-1001 A Doc. ID: 010725-1220-BG2100_Mount_Template.ai

BlueGate 2100 Quick Install 1. Mount BlueGate 2100 on the wall or place it on a flat surface away from heat, moisture, open flames, microwave devices and 2.4 GHz telecommunications devices. Route the Ethernet cable away from other cables that may cause interference. 2. Snap one end of the Ethernet cable into the jack of a hardwired connection to the network. 3. Place the other end of the Ethernet cable into the RJ-45 connector on BlueGate 2100. 4. Insert the power plug into the power jack on BlueGate 2100. 5. Plug the power supply into a 120-240 VAC, 50-60 Hz outlet. BlueGate 2100 will automatically obtain an IP address from the Local Area Network DHCP server. Refer to section 5.2 of the BlueGate Administrator’s Guide if installing in a non-DHCP environment. 6. Insert the BlueGate 2100 compact disc and enter the MAC (Media Access Control) address (found on the serial number label) on the second screen of the wizard. On the third screen select the “Check to automatically open browser when finished” option and click Finish. If the wiza rd does not start automatically when the CD is inserted, click Start > Run, enter D:\FindIP.exe in the dialog box and then click OK. CAUTION: Telephone cables often use the same type of connector as network cables; some wall plates, especially in office environments, have both telephone and network jacks in the same plate. Slide doors away from the center of BlueGate 2100 to remove them. Do not lift or pry the doors . FCC STATEMENT WIDCOMM, Inc., 9645 Scranton Road, Suite 205, San Diego, CA 92121, 858-453-8400. BlueGate, PKLWBG-2100. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and, (2) This device must accept any interference received including interference that may cause undesired operation. Per CFR 47, PART 15, Paragraph 15.21: User changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate the equipment. Application PKLWBG-2100 Additional Information for the FCC approval of Widcomm Inc.’s BlueGate 2100 RF Exposure Statement IMPORTANT NOTE: To meet FCC RF exposure compliance requirements the following antenna installation and device operating configurations must be satisfied: BlueGate 2100 must be wall or ceiling mounted or placed on a surface such that a minimum normal operating distance of 20 centimeters is maintained from the human body at all times. LICENSED SOFTWARE © Copyright 2000 – 2001, WIDCOMM, Inc. (WIDCOMM). All rights reserved. WARNING This software and accompanying documentation are protected by copyright law and international treaties. Unauthorized reproduction or distribution of this software, or any portion of it, may result in severe civil and criminal penalties, and will be prosecuted to the maximum extent possible under the law. Use of this software is governed by the terms of the end user license agreement that accompanies or is included with such software. Unless otherwise noted in the end user license agreement, or herein, no part of the documentation accompanying this software, whether provided in printed or electronic form may be reproduced in any form, or stored in a database or retrieval system, or transmitted in any form or by any means, or used to make any derivative work (such as translation, transformation, or adaptation) without the express, prior written consent of WIDCOMM. Trademark(s) ™ and Registered Trademark(s) ® WIDCOMM, the WIDCOMM logo, and BlueGate are trademarks of WIDCOMM, Inc. Bluetooth and the Bluetooth logos are trademarks owned by Bluetooth SIG, Inc., U.S.A. and licensed to WIDCOMM, Inc. Other brand and product names may be registered trademarks or trademarks of their respective holders. Part Number: 100238-1001 Document ID: 010710-0608-BG2100_Start_Here.doc BlueGate 2100 Network Access Point With Point-to-Multipoint Support

Page 1 Rev.No 1.0 ATTESTATION STATEMENT - Blugate 2100 - 24 July 2001 GENERAL REMARKS: SUMMARY: All tests were performed per CFR 47, FCC Part 15, Paragraphs 15.205; 15.209; 15.209(a); 15.247(a)(1)(i); 15.247(a)(1)(ii); 15.247(c) were n - Performed The Equipment Under Test n - Fulfills the requirements of CFR 47, FCC Part 15, Paragraphs 15.205; 15.209; 15.209(a); 15.247(a)(1)(i); 15.247(a)(1)(ii); 15.247(c) - TÜV PRODUCT SERVICE, INC. - Responsible Engineer: Jim Owen (EMC Engineer)

PLL Clock Generator 16MHz, 20ppm Crystal 10MHz 16MHz 25MHz Network Processor 16MHz Memory SDRAM 50MHz 10/100 Ethernet Phy 25MHz Field Programmable Gate Array 10MHz Bluetooth RF Transciever Application PKLWBG-2100 Additional Information for the FCC approval of Widcomm Inc.'s BLUEGATE 2100 Oscillator Block Diagram July 10, 2001

Case bottom Case connector side Case covers Case opposite side Case top Connectors covers off Covers bottom

PCB ASSEMBLY INCASE TOP PCB ASSEMBLY SHIELD REMOVED INCASE TOP PCB ASSY SHIELD REMOVED OUT OF CASE TOP PCB NO SHIELD BOTTOM VIEW PCB NO SHIELD TOP ALPS RF MODULE NO SHIELD BOTTOM ALPS RF MODULE NO SHIELD TOP CASE ASSY WITH TOP SHIELD CASE ASSY WITHOUT TOP SHIELD LIGHT PIPE ASSY VIEW 1 LIGHT PIPE ASSY VIEW 2 PCB SHIELDS INSIDE PCB SHIELDS OUTSIDE PAB NO ANTENNAS WIDCOMM PCB PATCH ANTENNA BOTTOM WIDCOMM PCB PATCH ANTENNA TOP ASSY

Widcomm Inc.7/20/2001 FCC Application XXX-WBC-10001Operating Description Application PKLWBG-2100 Additional Information for FCC approval of Widcomm Inc.’s Bluegate 2100 Operating Description May 22, 2001 The Bluegate 2100 is a network access product designed to provide a concurrent wireless bi-directional link between a 10/100 Base-T Ethernet port and up to 7 other Bluetooth devices. The Bluegate 2100 device contains an Alps integrated Bluetooth transceiver component, network processor, field programmable gate array, interface components, and power management. The device field programmable gate array, and software work in conjunction allowing a seamless connection that is designed to operate simultaneously with neighboring wireless Bluetooth devices. The Bluetooth topology, concept, and algorithms handle multiple user environments. The transceiver is implemented using Bluetooth radio module from Alps(see “Item 6-BG FCC-Alps Module DS.pdf”). This module contains a 2.4GHz Bluetooth radio which is designed for fast frequency hopping over 79 one megahertz channels. The design is implemented on a single boards isolated into three distinct areas: RF, Analog, and baseband. The Alps RF transceiver is connected to a proprietary PCB patch antenna that was designed by Widcomm (see “Item 6-BG FCC-Widcomm PCB Patch Antenna Spec.pdf”). The unit is powered from a 6VDC/2A wall wart. Major support IC’s internal to the device are, a network processor, Flash memory, synchronous DRAM, 10/100 Base- T Ethernet Phy, a crystal oscillator at 16 MHz, PLL based clock generator, Bluetooth RF Transceiver, and interface components. REVISIONS REV DESCRIPTION DATE APPROVED A RELEASED PER ECN PRELIM Part Specification Drawing UNLESS OTHERWISE SPECIFIED, DIMENSIONS ARE IN INCHES TOLERANCES ARE: XX= / XXX=±.005 DO NOT SCALE DRAWING APPROVALS DATE SAN DIEGO, CALIFORNIA ORIGINATOR D. McPeak 7/10/2001 REVIEW V. Petrucci TITLE ANTENNA, PATCH, PCB, ROGERS 4003 DIELECTRIC ENGINEERING PROPRIETARY TO WIDCOMM NOT TO BE REPRODUCED OR USED FOR MANUFACTURING PURPOSES EXCEPT ON WIDCOMM ORDER OR WITH PRIOR WRITTEN CONSENT. MANUFACTURING SIZE A DWG NO. 100031 REV A MATERIALS SCALE NONE SHEET 1 OF 6 SIZEDWG NO.REV SCALE A100031 A NONESHEET 2 OF 6 CONTINUATION SHEET 1.0 SCOPE/PURPOSE: This Specification Control drawing defines the requirements for a PCB Assembly patch antenna for use on the Bluegate 2000. All specifications apply over the temperature range of 0°C to +70°C unless noted otherwise. 1.1 Part Number: The WIDCOMM part number shall be: 100031-1001 2.0 REFERENCE DOCUMENTS: Orcad Database Widcomm Gerber Files 3.0 REQUIREMENTS: 3.1 ELECTRICAL REQUIREMENTS: RATINGS: ABSOLUTE Temperature : -55°C to +155°C OPERATING Power Input: 50 W max CHARACTERISTICS: See TABLE 1 3.2 MECHANICAL REQUIREMENTS: 3.2.1 Physical Dimensions: The physical dimensions shall be in accordance with Figure 1 herein. Markings: Parts supplied to this specification shall be marked in accordance with the manufacturer's standard procedure. In addition, the packaging container or the individual unit packs shall be marked with the WIDCOMM part number and manufacturer's identification as a minimum. 3.3 ENVIRONMENTAL REQUIREMENTS: See TABLE 1 4.0 QUALITY ASSURANCE PROVISIONS: 4.1 Certificate of Compliance: A certificate of compliance (c of c) shall accompany the lot confirming the products received are in compliance with this specification. The certificate of compliance shall include the purchase order number, the WIDCOMM part number, quantity shipped with this lot, and the signature of the supplier’s quality assurance management representative. 4.2 Workmanship: The parts supplied to this specification shall be processed in such a manner as to be uniform in quality and shall be free from sharp edges, burrs, and other defects that will affect life, serviceability, or appearance. 4.3 Packaging: All devices supplied to this drawing shall be shipped in ESD safe packaging. Materials used for packaging shall not cause corrosion or adversely affect the solderability of the devices. SIZEDWG NO.REV SCALE A100031 A NONESHEET 3 OF 6 CONTINUATION SHEET 4.4 Quality Conformance: All parts supplied to this specification shall inspected 100% to the requirements listed herein : Electrical Conformance: a. From RF input pin to center of antenna plate shall read less than 50milliohm. b. From RF input pin all ground pins shall read greater than 1Megohm. c. From RF ground pin 1 to all other pins, except RF, input shall read less than 50milliohm. 5.0 PREPARATION FOR DELIVERY: 6.0 NOTES: 6.1 Ordering Data: The purchase order shall specify the following: a. WIDCOMM part number. b. Requirements for notification of change of product or process to procuring activity. c. Requirements for the Certificate of Compliance. 6.2 Suggested Source(s) of Supply: Only the item described on this drawing when procured from the Vendor(s) listed herein is approved by WIDCOMM for use in the application(s) specified hereon. A substitute item shall not be used without prior testing and approval by WIDCOMM engineering. SOURCE(S) OF SUPPLY 1/ SUPPLIER DATA WIDCOMM Part Number Supplier Part Number Supplier Name and Address 100031-1001 TBD Company Name 1/ Identification of the suggested source(s) herein is not to be construed as a guarantee of present or continued availability as a source of supply for the item(s) described on this drawing. 6.3 Definitions: As Applicable. SIZEDWG NO.REV SCALE A100031 A NONESHEET 4 OF 6 CONTINUATION SHEET TABLE 1 GENERAL CHARACTERISTICS Operating Temperature Range: 0°C to +70°C Storage Temperature: -55°C to +125°C Frequency Range: 2.400 – 2.90GHz Input Power: +21dBm Max. (FCC part15) Input Impedance: 50ohms VSWR: < 2.0 : 1 Peak Gain: +6dBi Max. (FCC part15) 3dB beamwidth: > +/-60° from boresight Front to back ratio: > 10dB Ground plane size: 4” x 3” Nominal Thermal shock: Per MIL-STD-202 METHOD 107, CONDITION A -55 TO +125 degrees C SIZEDWG NO.REV SCALE A100031 A NONESHEET 5 OF 6 CONTINUA…

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Widcomm Inc.7/24/2001 FCC Application XXX-WBC-10001Sample Label FCC Statement: RF Exposure Compliance Widcomm Inc. 9645 Scranton Road, Suite 205 San Diego, CA 92121 858-453-8400 Bluegate 2100 RF exposure compliance issues regarding FCC ID: “PKLWBG-2100" The maximum RF output of the Bluegate product is 20 dBm, and the internal PCB mounted antenna has a maximum gain less than 3 dBi. The product RF output is below the SAR and MPE limits. Widcomm Inc.7/20/2001 FCC Application XXX-WBC-10001Frequency Hopping Compliance Application PKLWBG-1000 Additional Information for the FCC approval of Widcomm Inc.’s Bluegate 1000 RF Exposure Statement IMPORTANT NOTE: To comply with FCC RF exposure compliance requirements the following antenna installation and device operating configurations must be satisfied: 1. The Bluegate 1000 unit must be placed on a desk or table such that a minimum normal operating distance of 20 cm is maintained from the body at all times.

TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone 858 546 3999 FAX 858 546 0364 Report No. SC105179-03 Page 1 Rev.No 1.0 MEASUREMENT AND TECHNICAL REPORT WIDCOMM, INC. 9645 Scranton Road, Suite 205 San Diego, CA 92121 DATE: 23 July 2001 This Report Concerns:Original Grant: XClass II Change: Equipment Type:Bluegate 2100 Deferred grant requested per 47 CFR 0.457(d)(1)(ii)?Yes: Defer until: No: X Company Name agrees to notify the Commission by:N/A of the intended date of announcement of the product so that the grant can be issued on that date. Transition Rules Request per 15.37?Yes:No: X* (*) FCC Part 15, Paragraphs 15.205; 15.209; 15.209(a); 15.247(a)(1)(i); 15.247(a)(1)(ii); 15.247(c) Report Prepared by: TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone: 858 546 3999 Fax: 858 546 0364 TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone 858 546 3999 FAX 858 546 0364 Report No. SC105179-03 Page 2 Rev.No 1.0 TABLE OF CONTENTS Pages 1 GENERAL INFORMATION3 1.1Product Description3 1.2Related Submittal Grant12 1.3Tested System Details12 1.4Test Methodology12 1.5Test Facility12 2 SYSTEM TEST CONFIGURATION13 2.1Justification13 2.2EUT Exercise Software13 2.3Special Accessories13 2.4Equipment Modifications13 2.5Configuration of Tested System13 3RADIATED EMISSION EQUIPMENT/DATA14 Field Strength Calculation20 4 CONDUCTED EMISSION EQUIPMENT/DATA21 5Attestation Statement46 TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone 858 546 3999 FAX 858 546 0364 Report No. SC105179-03 Page 3 Rev.No 1.0 1 GENERAL INFORMATION 1.1Product Description TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone 858 546 3999 FAX 858 546 0364 Report No. SC105179-03 Page 12 Rev.No 1.0 1 GENERAL INFORMATION (continued) 1.2Related Submittal/Grant None 1.3Tested System Details The FCC IDs for all equipment, plus descriptions of all cables used in the tested system are: None 1.4Test Methodology Purpose of Test:To demonstrate compliance with the ANSI C63.4 setup. Test Performed:X1. Conducted Emissions, FCC Part 15, Paragraph 15.107(a); 15.247(a)(1)(i);15.247(a)(1)(ii); 15.247(c) 2. Radiated Emissions EN55022: 1992 Class B limit, 30 - 1,000 MHz, 10 meters X3. Radiated Emission per FCC Part 15, Paragraphs 15.109(a); 15.205; 15.209(a); and 15.247 4. Engineering evaluations 5. Frequency Stability, Part 2, Paragraph 2.995, and Part 87, Paragraph 87.133 Both Conducted and radiated testing were performed according to the procedures in FCC/ANSI C63.4 and CSA 108.8 - M1983. Radiated testing was performed at an antenna-to-EUT distance of 3 meters (1 - 10 GHz). 1.5Test Facility The open area test site and conducted measurement data were tested by: TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone: 858 546 3999 Fax: 858 546 0364 The Test Site Data and performance comply with ANSI 63.4 and are registered with the FCC, 7435 Oakland Mills Rd, Columbia Maryland 21046. All Measurement Data is acquired according to the content of FCC Measurement Procedure and ANSI C63.4, unless supplemented with additional requirements as noted in the test report. TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone 858 546 3999 FAX 858 546 0364 Report No. SC105179-03 Page 13 Rev.No 1.0 2.SYSTEM TEST CONFIGURATION 2.1Justification The EUT was initially tested for FCC emission in the following configuration: See Block Diagram. 2.2EUT Exercise Software None 2.3Special Accessories None 2.4Modification None 2.5Configuration of Tested System See Block Diagram. TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone 858 546 3999 FAX 858 546 0364 Report No. SC105179-03 Page 14 Rev.No 1.0 3RADIATED EMISSION EQUIPMENT/DATA The following data lists the significant emission frequencies, measured levels, correction factor (which includes cable and antenna corrections), the corrected reading, and the limit. See following page(s). See test setup photos for radiated emissions test setup. TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone 858 546 3999 FAX 858 546 0364 Report No. SC105179-03 Page 19 Rev.No 1.0 Emissions Test Conditions: RADIATED EMISSIONS The RADIATED EMISSIONS measurements were performed at the following test location : o - Test not applicable Canyon #3 (Open Area Test Site), Carroll Canyon, San Diego Roof, 3-meter Open Site Testing was performed at a test distance of: 3 meters 10 meters Test Equipment Used : Model No.Prop. No.DescriptionManufacturerSerial No.Cal Date 3115251Antenna, Double Ridge GuideEMCO249510/01 3110B491Biconical AntennaEMCO9508-213407/01 3146418LP AntennaEMCO9402-377503/02 ESVS30427ReceiverRohde & Schwarz830350/00611/01 HP8566B407Spectrum AnalyzerHewlett Packard2311A0220902/01 PreAmp 2- 20 GHz 752PreAmpTUV PS--N/A HP8445B809Automatic PreselectorHewlett Packard1442A01127* Remarks:(*) Verified TÜV PRODUCT SERVICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone 858 546 3999 FAX 858 546 0364 Report No. SC105179-03 Page 20 Rev.No 1.0 Field Strength Calculation If a preamplifier was used during the Radiated Emission Testing, it is required that the amplifier gain must be subtracted from the Spectrum Analyzer (Meter) Reading. In addition, a correction factor for the antenna , cable used and a distance factor, if any, must be applied to the Meter Reading before a true field strength reading can be obtained. In the automatic measurement, these considerations are automatically presented as a part of the print out. In the case of manual measurements and for greater efficiency and convenience, instead of using these correlation factors for each meter reading, the specification limit was modified to reflect these correlation factors at each frequency value so that the meter readings can be compared directly to the modified specification limit. This modified specification limit is referred to as the "Corrected Meter Reading Limit" or simply the CMRL, which is the actual field strength pr…

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