Test Report DFS

FCC ID: PD96235ANHU

Test Report

Download: PDF
FCCID_1714627

TEST REPORT Covering the DYNAMIC FREQUENCY SELECTION (DFS) REQUIREMENTS OF FCC Part 15 Subpart E (UNII) Intel® Centrino® Advanced-N 6235 models 6235ANHMW and 6235ANHU COMPANY: Intel Corporation 2111 N.E. 25th Avenue Hillsboro, OR, 97124 TEST SITE: Elliott Laboratories 41039 Boyce Road Fremont, CA 94538 REPORT DATE: September 27, 2011 FINAL TEST DATE: September 24, 2010 TEST ENGINEER: Mehran Birgani TOTAL NUMBER OF PAGES: 20 PROGRAM MGR / QUALITY ASSURANCE DELEGATE / TECHNICAL REVIEWER: FINAL REPORT PREPARER: ______________________________ ______________________________ David W. Bare David Guidotti Chief Engineer Senior Technical Writer Elliott Laboratories is accredited by the A2LA, certificate number 2016.01, to perform the test(s) listed in this report, except where noted otherwise. This report and the information contained herein represent the results of testing test articles identified and selected by the client performed to specifications and/or procedures selected by the client. National Technical Systems (NTS) makes no representations, expressed or implied, that such testing is adequate (or inadequate) to demonstrate efficiency, performance, reliability, or any other characteristic of the articles being tested, or similar products. This report should not be relied upon as an endorsement or certification by NTS of the equipment tested, nor does it represent any statement whatsoever as to its merchantability or fitness of the test article, or similar products, for a particular purpose. This report shall not be reproduced except in full File: R84674 Page 1 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 TABLE OF CONTENTS TABLE OF CONTENTS ............................................................................................................................................2 LIST OF TABLES.......................................................................................................................................................3 LIST OF FIGURES.....................................................................................................................................................3 SCOPE..........................................................................................................................................................................4 OBJECTIVE ................................................................................................................................................................4 STATEMENT OF COMPLIANCE...........................................................................................................................4 DEVIATIONS FROM THE STANDARD ................................................................................................................4 EQUIPMENT UNDER TEST (EUT) DETAILS......................................................................................................5 GENERAL................................................................................................................................................................5 ENCLOSURE...........................................................................................................................................................6 MODIFICATIONS...................................................................................................................................................6 SUPPORT EQUIPMENT.........................................................................................................................................6 EUT INTERFACE PORTS ......................................................................................................................................6 EUT OPERATION ...................................................................................................................................................6 RADAR WAVEFORMS.............................................................................................................................................7 TEST RESULTS..........................................................................................................................................................7 TEST RESULTS SUMMARY – FCC PART 15, CLIENT DEVICE .......................................................................7 MEASUREMENT UNCERTAINTIES....................................................................................................................8 DFS TEST METHODS ...............................................................................................................................................9 RADIATED TEST METHOD .................................................................................................................................9 DFS MEASUREMENT INSTRUMENTATION....................................................................................................11 RADAR GENERATION SYSTEM .......................................................................................................................11 CHANNEL MONITORING SYSTEM ..................................................................................................................12 DFS MEASUREMENT METHODS .......................................................................................................................13 DFS – CHANNEL CLOSING TRANSMISSION TIME AND CHANNEL MOVE TIME ..................................13 DFS – CHANNEL NON-OCCUPANCY AND VERIFICATION OF PASSIVE SCANNING............................13 SAMPLE CALCULATIONS ...................................................................................................................................13 DETECTION PROBABILITY / SUCCESS RATE ...............................................................................................13 THRESHOLD LEVEL ...........................................................................................................................................13 APPENDIX A TEST EQUIPMENT CALIBRATION DATA ..............................................................................14 APPENDIX B TEST DATA AND PLOTS FOR CHANNEL CLOSING AND NON OCCUPANCY..............15 FCC PART 15 SUBPART E CHANNEL CLOSING MEASUREMENTS .................................................................15 APPENDIX C PASSIVE SCANNING ATTESTATION.......................................................................................19 APPENDIX D TEST CONFIGURATION PHOTOGRAPHS..............................................................................20 File: R84674 Page 2 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 LIST OF TABLES Table 1 FCC Short Pulse Radar Test Waveforms......................................................................................... 7 Table 2 FCC Long Pulse Radar Test Waveforms......................................................................................... 7 Table 3 FCC Frequency Hopping Radar Test Waveforms ........................................................................... 7 Table 4 FCC Part 15 Subpart E Client Device Test Result Summary .......................................................... 7 Table 5 FCC Part 15 Subpart E Channel Closing Test Results .................................................................. 15 LIST OF FIGURES Figure 1 Test Configuration for radiated Measurement Method .................................................................. 9 Figure 2: Channel Closing .......................................................................................................................... 16 Figure 3: Channel Closing 600ms window................................................................................................. 17 Figure 4: Non-Occupancy Plot ................................................................................................................... 18 File: R84674 Page 3 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 SCOPE The Federal Communications Commission and the European Telecommunications Standards Institute (ETSI) publish standards regarding Electromagnetic Compatibility and Radio spectrum Matters for radio-communications devices. Tests have been performed on the Intel® Centrino® Advanced-N 6235 models 6235ANHMW and 6235ANHU in accordance with these standards. Test data has been taken pursuant to the relevant DFS requirements of FCC Part 15 Subpart E Unlicensed National Information Infrastructure (U-NII) Devices. Tests were performed in accordance with these standards together with the current published versions of the basic standards referenced therein as outlined in Elliott Laboratories test procedures. The test results recorded herein are based on a single type test of the Intel® Centrino® Advanced-N 6235 models 6235ANHMW and 6235ANHU and therefore apply only to the tested sample. The sample was selected and prepared by Steven Hackett of Intel Corporation. OBJECTIVE The objective of the manufacturer is to comply with the standards identified in the previous section. In order to demonstrate compliance, the manufacturer or a contracted laboratory makes measurements and takes the necessary steps to ensure that the equipment complies with the appropriate technical standards. Compliance with some DFS features is covered through a manufacturer statement or through observation of the device. STATEMENT OF COMPLIANCE The tested sample of the Intel® Centrino® Advanced-N 6235 models 6235ANHMW and 6235ANHU complied with the DFS requirements of FCC Part 15.407(h)(2) Maintenance of compliance is the responsibility of the manufacturer. Any modifications to the product should be assessed to determine their potential impact on the compliance status of the device with respect to the standards detailed in this test report. DEVIATIONS FROM THE STANDARD No deviations were made from the test methods and requirements covered by the scope of this report. File: R84674 Page 4 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 EQUIPMENT UNDER TEST (EUT) DETAILS GENERAL The Intel® Centrino® Advanced-N 6235 models 6235ANHMW and 6235ANHU are PCIe Half Mini Card form factor IEEE 802.11a/b/g/n wireless network adapter that operates in both the 2.4 GHz and 5.0 GHz spectra. The card supports 2x2 MIMO for 802.11n modes in both 20MHz and 40MHz channels. In legacy modes 1x2 operation is supported. The card is being certified with both full modular approval and limited modular approval. The two versions are electrically identical using the same hardware and firmware with respect to DFS functions. The full modular version is intended for factory installation only by the OEM (FCC ID: PD96235ANH; IC:1000M-6235ANH). The limited modular version is intended to allow the OEM to permit user installation when the host system is provided with a bios locking feature that prevents unauthorized installation (FCC ID: PD96235ANHU; IC:1000M-6235ANHU). All versions are approved under Intel model 6235ANHMW with the exception of the limited modular approval for Canada which is approved as model 6235ANHU (see table below). A sample was received and tested on September 24, 2010. The EUT consisted of the following component(s): Manufacturer Model Description Mac Address 6235ANHMW Express PCI Wireless Intel Corporation 00150079AD10 6235ANHU Adapter The manufacturer declared values for the EUT operational characteristics that affect DFS are as follows: Operating Modes (5250 – 5350 MHz, 5470 – 5725 MHz) Master Device Client Device (no In Service Monitoring, no Ad-Hoc mode) Client Device with In-Service Monitoring Antenna Gains / EIRP (5250 – 5350 MHz, 5470 – 5725 MHz) Power does not exceed 200mW eirp Channel Protocol IP Based File: R84674 Page 5 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 ENCLOSURE The EUT has no enclosure. It is designed to be installed within the enclosure of a host computer. MODIFICATIONS The EUT did not require modifications during testing in order to comply with the requirements of the standard referenced in this test report. SUPPORT EQUIPMENT The following equipment was used as local support equipment for testing: Manufacturer Model Description Serial Number FCC ID Cisco Systems RM1252AG-A-K9 Wireless AP FTX209906V LDK102062 Dell PP02X Laptop (file server) JMB3551 DoC Toshiba PSA G8U-0400 1W Laptop 49290792Q DoC Airlink 101 AR430W Router 030008256167 RRK-AR430W The italicized device was the master device. EUT INTERFACE PORTS The EUT was installed inside a laptop computer during testing. EUT OPERATION The EUT was operating with software: driver 13.0.0.238. During testing the system was configured with a streaming video file from the master device (sourced by the PC connected to the master device via an Ethernet interface) to the client device. The streamed file was the “FCC” test file and the client device was using Windows Media Player Classic as required by FCC Part 15 Subpart E. File: R84674 Page 6 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 RADAR WAVEFORMS Table 1 FCC Short Pulse Radar Test Waveforms Minimum Minimum Radar Pulse Width PRI Pulses / Detection Number of Type (µsec) (µsec) burst Percentage Trials 1 1 1428 18 60% 30 2 1-5 150-230 23-29 60% 30 3 6-10 200-500 16-18 60% 30 4 11-20 200-500 12-16 60% 30 Aggregate (Radar Types 1-4) 80% 120 Table 2 FCC Long Pulse Radar Test Waveforms Pulse Chirp Minimum Minimum Radar PRI Pulses / Number of Width Width Detection Number of Type (µsec) burst Bursts (µsec) (MHz) Percentage Trials 5 50-100 5-20 1000-2000 1-3 8-20 80% 30 Table 3 FCC Frequency Hopping Radar Test Waveforms Hopping Pulse Minimum Minimum Radar PRI Hopping Sequence Width Pulses / hop Detection Number of Type (µsec) Rate (kHz) Length (µsec) Percentage Trials (msec) 6 1 333 9 0.333 300 70% 30 TEST RESULTS TEST RESULTS SUMMARY – FCC Part 15, CLIENT DEVICE Table 4 FCC Part 15 Subpart E Client Device Test Result Summary Radar Radar Measured Description Requirement Test Data Status Type Frequency Value Channel closing Type 1 5260 0.84ms <60ms 0 Complies transmission time Type 1 Channel move time 5260 512ms 10s 0 Complies Non-occupancy Type 1 5300 > 30 minutes > 30 minutes 0 Complies period - associated Passive Scanning N/A N/A Refer to manufacturer attestation, Appendix C Notes: 1) Tests were performed using the radiated test method. 2) Channel availability check, detection threshold and non-occupancy period are not applicable to client devices. File: R84674 Page 7 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 MEASUREMENT UNCERTAINTIES ISO/IEC 17025 requires that an estimate of the measurement uncertainties associated with the emissions test results be included in the report. The measurement uncertainties given below are based on a 95% confidence level, with a coverage factor (k=2) and were calculated in accordance with UKAS document LAB 34. Measurement Measurement Unit Expanded Uncertainty Timing (Channel move time, aggregate ms Timing resolution +/- 0.24% transmission time) Timing seconds 5 seconds (non occupancy period) DFS Threshold (radiated) dBm 1.6 DFS Threshold (conducted) dBm 1.2 File: R84674 Page 8 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 DFS TEST METHODS RADIATED TEST METHOD The combination of master and slave devices is located in an anechoic chamber. The simulated radar waveform is transmitted from a directional horn antenna (typically an EMCO 3115) toward the unit performing the radar detection (radar detection device, RDD). Every effort is made to ensure that the main beam of the EUT’s antenna is aligned with the radar-generating antenna. Anechoic Chamber Master Device Radar ~3m Antenna Monitoring Antenna Traffic Monitoring Radar Generation System System Figure 1 Test Configuration for radiated Measurement Method File: R84674 Page 9 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 The signal level of the simulated waveform is set to a reference level equal to the threshold level (plus 1dB if testing against FCC requirements). Lower levels may also be applied on request of the manufacturer. The level reported is the level at the RDD antenna and so it is not corrected for the RDD’s antenna gain. The RDD is configured with the lowest gain antenna assembly intended for use with the device. The signal level is verified by measuring the CW signal level from the radar generation system using a reference antenna of gain G (dBi). The radar signal level is calculated from the measured level, R (dBm), and any cable loss, L (dB), between the reference antenna and the measuring instrument: Applied level (dBm) = R – GREF + L If both master and client devices have radar detection capability then the device not under test is positioned with absorbing material between its antenna and the radar generating antenna, and the radar level at the non RDD is verified to be at least 20dB below the threshold level to ensure that any responses are due to the RDD detecting radar. The antenna connected to the channel monitoring subsystem is positioned to allow both master and client transmissions to be observed, with the level of the EUT’s transmissions between 6 and 10dB higher than those from the other device. File: R84674 Page 10 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 DFS MEASUREMENT INSTRUMENTATION RADAR GENERATION SYSTEM An Agilent PSG is used as the radar-generating source. The integral arbitrary waveform generators are programmed using Agilent’s “Pulse Building” software and Elliott custom software to produce the required waveforms, with the capability to produce both un- modulated and modulated (FM Chirp) pulses. Where there are multiple values for a specific radar parameter then the software selects a value at random and, for FCC tests, the software verifies that the resulting waveform is truly unique. With the exception of the hopping waveforms required by the FCC’s rules (see below), the radar generator is set to a single frequency within the radar detection bandwidth of the EUT. The frequency is varied from trial to trial by stepping in 5MHz steps. Frequency hopping radar waveforms are simulated using a time domain model. A randomly hopping sequence algorithm (which uses each channel in the hopping radar’s range once in a hopping sequence) generates a hop sequence. A segment of the first 100 elements of the hop sequence are then examined to determine if it contains one or more frequencies within the radar detection bandwidth of the EUT. If it does not then the first element of the segment is discarded and the next frequency in the sequence is added. The process repeats until a valid segment is produced. The radar system is then programmed to produce bursts at time slots coincident with the frequencies within the segment that fall in the detection bandwidth. The frequency of the generator is stepped in 1 MHz increments across the EUT’s detection range. The radar signal level is verified during testing using a CW signal with the AGC function switched on. Correction factors to account for the fact that pulses are generated with the AGC functions switched off are measured annually and an offset is used to account for this in the software. The generator output is connected to the coupling port of the conducted set-up or to the radar-generating antenna. File: R84674 Page 11 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 CHANNEL MONITORING SYSTEM Channel monitoring is achieved using a spectrum analyzer and digital storage oscilloscope. The analyzer is configured in a zero-span mode, center frequency set to the radar waveform’s frequency or the center frequency of the EUT’s operating channel. The IF output of the analyzer is connected to one input of the oscilloscope. A signal generator output is set to send either the modulating signal directly or a pulse gate with an output pulse co-incident with each radar pulse. This output is connected to a second input on the oscilloscope and the oscilloscope displays both the channel traffic (via the if input) and the radar pulses on its display. For in service monitoring tests the analyzer sweep time is set to > 20 seconds and the oscilloscope is configured with a data record length of 10 seconds for the short duration and frequency hopping waveforms, 20 seconds for the long duration waveforms. Both instruments are set for a single acquisition sequence. The analyzer is triggered 500ms before the start of the waveform and the oscilloscope is triggered directly by the modulating pulse train. Timing measurements for aggregate channel transmission time and channel move time are made from the oscilloscope data, with the end of the waveform clearly identified by the pulse train on one trace. The analyzer trace data is used to confirm that the last transmission occurred within the 10-second record of the oscilloscope. If necessary the record length of the oscilloscope is expanded to capture the last transmission on the channel prior to the channel move. Channel availability check time timing plots are made using the analyzer. The analyzer is triggered at start of the EUT’s channel availability check and used to verify that the EUT does not transmit when radar is applied during the check time. The analyzer detector and oscilloscope sampling mode is set to peak detect for all plots. File: R84674 Page 12 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 DFS MEASUREMENT METHODS DFS – CHANNEL CLOSING TRANSMISSION TIME AND CHANNEL MOVE TIME Channel clearing and closing times are measured by applying a burst of radar with the device configured to change channel and by observing the channel for transmissions. The time between the end of the applied radar waveform and the final transmission on the channel is the channel move time. The aggregate transmission closing time is measured as the total time of all individual transmissions from the EUT that are observed starting 200ms at the end of the last radar pulse in the waveform. This value is required to be less than 60ms. DFS – CHANNEL NON-OCCUPANCY AND VERIFICATION OF PASSIVE SCANNING The channel that was in use prior to radar detection by the master is additionally monitored for 30 minutes to ensure no transmissions on the vacated channel over the required non-occupancy period. This is achieved by tuning the spectrum analyzer to the vacated channel in zero-span mode and connecting the IF output to an oscilloscope. The oscilloscope is triggered by the radar pulse and set to provide a single sweep (in peak detect mode) that lasts for at least 30 minutes after the end of the channel move time. For devices with a client-mode that are being evaluated against FCC rules the manufacturer must supply an attestation letter stating that the client device does not employ any active scanning techniques (i.e. does not transmit in the DFS bands without authorization from a Master device). SAMPLE CALCULATIONS DETECTION PROBABILITY / SUCCESS RATE The detection probability, or success rate, for any one radar waveform equals the number of successful trials divided by the total number of trials for that waveform. THRESHOLD LEVEL The threshold level is the level of the simulated radar waveform at the EUT’s antenna. If the test is performed in a conducted fashion then the level at the rf input equals the level at the antenna plus the gain of the antenna assembly, in dBi. The gain of the antenna assembly equals the gain of the antenna minus the loss of the cabling between the rf input and the antenna. The lowest gain value for all antenna assemblies intended for use with the device is used when making this calculation. If the test is performed using the radiated method then the threshold level is the level at the antenna. File: R84674 Page 13 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 Appendix A Test Equipment Calibration Data Tested September 24, 2010 Manufacturer Description Model # Asset # Cal Due Hewlett Packard EMC Analyzer 8595EM 780 05-Jan-11 Tektronics Digital Oscilloscope TDS5052B 2118 28-Sep-10 Agilent PSG Vector Signal Generator E8267C 1877 24-Mar-11 EMCO 1-18GHz Horn antenna 3115 1779 Transmit only EMCO 1-18GHz Horn antenna 3115 1142 02-Aug-12 File: R84674 Page 14 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 Appendix B Test Data and Plots for Channel Closing and non Occupancy FCC PART 15 SUBPART E Channel Closing Measurements Channel Closing Channel Move Waveform Type Transmission Time 1 Time Result Measured Limit Measured Limit Radar Type 1 0.86 ms 60 ms 512 ms 10 s Complied Table 5 FCC Part 15 Subpart E Channel Closing Test Results The first pair of channel closing plots (Figure 2: Channel Closing) has 40 seconds of data on the lower plot (low resolution) and 10 seconds of data on the upper (high resolution plot to show the final transmission is well before the maximum 10 second channel move time has elapsed. Figure 3: Channel Closing 600ms window provides a zoom-in for the high resolution (upper) timing plot to show the 600ms after the radar burst as requested by the FCC. This shows that there were only two, very short duration transmissions after the initial 200ms following the radar, consistent with control signals. The resolution for the upper plot in both the 40-second and 600ms data is 20µs. After the final channel closing test the channel was monitored for a further 30 minutes. No transmissions occurred on the channel. Refer to Figure 4: Non-Occupancy Plot for details. 1 Channel closing time for FCC measurements is the aggregate transmission time starting from 200ms after the end of the radar signal to the completion of the channel move. File: R84674 Page 15 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 Figure 2: Channel Closing File: R84674 Page 16 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 Figure 3: Channel Closing 600ms window File: R84674 Page 17 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 The non-occupancy plot was made over a 30-minute time period following the channel move time with the analyzer IF output connected to the scope and tuned to the vacated channel. No transmissions were observed after the channel move had been completed. After the channel move the client re-associated with the master device on the new channel. Figure 4: Non-Occupancy Plot File: R84674 Page 18 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 Appendix C Passive Scanning Attestation An attestation regarding the use of passive scanning is provided as a separate document as part of the FCC application. File: R84674 Page 19 of 20

Elliott Laboratories -- EMC Department Test Report Report Date: September 27, 2011 Appendix D Test Configuration Photographs (EUT was installed inside the laptop PC) File: R84674 Page 20 of 20


Document Created: 2011-09-29 10:31:03
Document Modified: 2011-09-29 10:31:03
© 2025 FCC.report
This site is not affiliated with or endorsed by the FCC