Test report T-Coil part 1

FCC ID: MSQX01AD

Test Report

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FCCID_4083967

HAC T-COIL TEST REPORT Report No. : HA871955B HEARING AID COMPATIBILITY T-COIL TEST REPORT FCC ID : MSQX01AD Equipment : ASUS Phone (Mobile Phone) Brand Name : ASUS Model Name : ASUS_X01AD T-Rating : T3 Applicant : ASUSTeK COMPUTER INC. 4F, No.150, Li-Te Rd., Peitou, Taipei 112, Taiwan Manufacturer : ASUSTeK COMPUTER INC. 4F, No.150, Li-Te Rd., Peitou, Taipei 112, Taiwan Standard : FCC 47 CFR §20.19 ANSI C63.19-2011 The product was received on Sep. 21, 2018 and testing was started from Oct. 21, 2018 and completed on Oct. 25, 2018 We, SPORTON INTERNATIONAL INC., would like to declare that the tested sample has been evaluated in accordance with the test procedures and has been in compliance with the applicable technical standards. The report must not be used by the client to claim product certification, approval, or endorsement by TAF or any agency of government. The test results in this variant report apply exclusively to the tested model / sample. Without written approval of SPORTON INTERTIONAL INC. EMC & Wireless Communications Laboratory, the test report shall not be reproduced except in full. Approved by: Cona Huang / Deputy Manager SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory No. 52, Huaya 1st Rd., Guishan Dist., Taoyuan City, Taiwan (R.O.C.) TEL : 886-3-327-3456 Page : 1 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B Table of Contents 1. Attestation of Test Results ........................................................................................................................................ 4 2. General Information ................................................................................................................................................... 5 3. Testing Location......................................................................................................................................................... 6 4. Applied Standards ..................................................................................................................................................... 6 5. Air Interface and Operating Mode............................................................................................................................. 7 6. Measurement standards for T-Coil ........................................................................................................................... 8 6.1 Frequency Response ....................................................................................................................................... 8 6.2 T-Coil Signal Quality Categories ....................................................................................................................... 8 7. T-Coil Test Procedure ................................................................................................................................................ 9 7.1 Test Flow Chart................................................................................................................................................10 7.2 Test Setup Diagram ......................................................................................................................................... 11 7.3 Description of EUT Test Position .....................................................................................................................13 8. Test Equipment List ..................................................................................................................................................14 9. T-Coil testing for CMRS Voice ..................................................................................................................................15 9.1 GSM Tests Results ..........................................................................................................................................15 9.2 UMTS Tests Results ........................................................................................................................................16 10. T-Coil testing for OTT VoIP Application ..................................................................................................................17 11. Uncertainty Assessment ..........................................................................................................................................21 12. References .................................................................................................................................................................22 Appendix A. Plots of T-Coil Measurement Appendix B. DASY Calibration Certificate Appendix C. Test Setup Photos TEL : 886-3-327-3456 Page : 2 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B History of this test report Report No. Version Description Issued Date HA871955B Rev. 01 Initial issue of report Nov. 22, 2018 TEL : 886-3-327-3456 Page : 3 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 1. Attestation of Test Results Frequency Magnetic Air Interface Band MHz T-Rating Response Intensity GSM850 T4 Pass Pass GSM CMRS Voice GSM1900 T4 Pass Pass EDGE850 T4 Pass Pass OTT over EDGE EDGE1900 T3 Pass Pass Band 2 T4 Pass Pass UMTS CMRS Voice Band 4 T4 Pass Pass Band 5 T4 Pass Pass Band 2 T4 Pass Pass OTT over UMTS Band 4 T3 Pass Pass Band 5 T3 Pass Pass Band 2 T4 Pass Pass Band 4 T4 Pass Pass Band 5 T4 Pass Pass Band 7 T4 Pass Pass OTT over LTE Band 12 T4 Pass Pass Band 17 T4 Pass Pass Band 26 T4 Pass Pass Band 38 T3 Pass Pass Band 41 T3 Pass Pass OTT over WiFi 2450 T3 Pass Pass Date Tested 2018/10/21 ~ 2018/10/25 The device is compliance with HAC limits specified in guidelines FCC 47CFR §20.19 and ANSI Standard ANSI C63.19. Reviewed by: Jason Wang Report Producer: Wan Liu TEL : 886-3-327-3456 Page : 4 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 2. General Information Product Feature & Specification Applicant Name ASUSTeK COMPUTER INC. Equipment Name ASUS Phone (Mobile Phone) Brand Name ASUS Model Name ASUS_X01AD FCC ID MSQX01AD HW Version A8r8a SW Version DailyBuildOPM1.WW_Phone-15.2016.1805.000-20180913 EUT Stage Production Unit GSM850: 824.2 MHz ~ 848.8 MHz GSM1900: 1850.2 MHz ~ 1909.8 MHz WCDMA Band II: 1852.4 MHz ~ 1907.6 MHz WCDMA Band IV: 1712.4 MHz ~ 1752.6 MHz WCDMA Band V: 826.4 MHz ~ 846.6 MHz LTE Band 2: 1850.7 MHz ~ 1909.3 MHz LTE Band 4: 1710.7 MHz ~ 1754.3 MHz LTE Band 5: 824.7 MHz ~ 848.3 MHz Frequency Band LTE Band 7: 2502.5 MHz ~ 2567.5 MHz LTE Band 12: 699.7 MHz ~ 715.3 MHz LTE Band 17: 706.5 MHz ~ 713.5 MHz LTE Band 26: 814.7 MHz ~ 848.3 MHz LTE Band 38: 2572.5 MHz ~ 2617.5 MHz LTE Band 41: 2537.5 MHz ~ 2652.5 MHz WLAN 2.4GHz Band: 2412 MHz ~ 2462 MHz Bluetooth: 2402 MHz ~ 2480 MHz GSM/GPRS/EGPRS/DTM AMR / RMC 12.2Kbps HSDPA HSUPA Mode DC-HSDPA HSPA+ (16QAM uplink) LTE: QPSK, 16QAM, 64QAM 802.11b/g/n HT20/HT40 Bluetooth BR/EDR/LE TEL : 886-3-327-3456 Page : 5 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 3. Testing Location Sporton Lab is accredited to ISO 17025 by Taiwan Accreditation Foundation (TAF code: 1190) and the FCC designation No. TW1190 under the FCC 2.948(e) by Mutual Recognition Agreement (MRA) in FCC test. Testing Laboratory Test Site SPORTON INTERNATIONAL INC. No. 52, Huaya 1st Rd., Guishan Dist., Taoyuan City, Taiwan (R.O.C.) Test Site Location TEL: +886-3-327-3456 FAX: +886-3-328-4978 Sporton Site No.: Test Site No. SAR04-HY 4. Applied Standards ‧ FCC CFR47 Part 20.19 ‧ ANSI C63.19 2011-version ‧ FCC KDB 285076 D01 HAC Guidance v05 ‧ FCC KDB 285076 D02 T Coil testing v03 ‧ FCC KDB 285076 D03 HAC FAQ v01 TEL : 886-3-327-3456 Page : 6 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 5. Air Interface and Operating Mode Air C63.19 Simultaneous Name of Voice Power Interface Band MHz Type Tested Transmitter Service Reduction GSM850 WLAN, BT No VO Yes CMRS Voice GSM1900 WLAN, BT No GSM EDGE850 SIP calling(1,2) VD Yes WLAN, BT / No EDGE1900 Google Duo(1) 850 WLAN, BT No 1750 VO Yes WLAN, BT CMRS Voice No UMTS 1900 WLAN, BT No SIP calling(1,2) HSPA VD Yes WLAN, BT / No Google Duo(1) Band 2 WLAN, BT No Band 4 WLAN, BT No Band 5 WLAN, BT SIP calling (1,2) No LTE Band 7 VD Yes WLAN, BT / No (FDD) Band 12 WLAN, BT Google Duo(1) No Band 17 WLAN, BT No Band 26 WLAN, BT No Band 38 WLAN, BT SIP calling(1,2) No LTE VD Yes / (TDD) Band 41 WLAN, BT No Google Duo(1) SIP calling(1,2) Wi-Fi 2450 VD Yes GSM,WCDMA,LTE / No Google Duo(1) BT 2450 DT No GSM,WCDMA,LTE NA No Type Transport: VO= Voice only DT= Digital Transport only (no voice) VD= CMRS and IP Voice Service over Digital Transport Remark: 1. For protocols not listed in Table 7.1 of ANSI C63.19-2011 or the ANSI C63.19-2011 VoLTE interpretation, the average speech level of −20 dBm0 should be used. 2. The SIP calling is android internal auxiliary functions under the dialing program. 3. The device have similar frequency in some LTE bands: LTE B12/17, 5/26, 38/41, since the supported frequency spans for the smaller LTE bands are completely cover by the larger LTE bands, therefore, only larger LTE bands were required to be tested for hearing-aid compliance. TEL : 886-3-327-3456 Page : 7 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 6. Measurement standards for T-Coil 6.1 Frequency Response The frequency response of the perpendicular component of the magnetic field, measured in 1/3 octave bands, shall follow the response curve specified in this sub-clause, over the frequency range 300 Hz to 3000 Hz. Figure 1.1 and Figure 1.2 provide the boundaries as a function of frequency. These response curves are for true field-strength measurements of the T-Coil signal. Thus, the 6 dB/octave probe response has been corrected from the raw readings. Fig. 1.1 Magnetic field frequency response for WDs with field strength≤-15dB at 1 KHz Fig. 1.2 Magnetic field frequency response for WDs with a field that exceeds –15 dB(A/m) at 1 kHz 6.2 T-Coil Signal Quality Categories This section provides the signal quality requirement for the intended T-Coil signal from a WD. Only the RF immunity of the hearing aid is measured in T-Coil mode. It is assumed that a hearing aid can have no immunity to an interference signal in the audio band, which is the intended reception band for this mode. A device is assessed beginning by determining the category of the RF environment in the area of the T-Coil source. The RF measurements made for the T-Coil evaluation are used to assign the category T1 through T4. The limitation is given in Table 1. This establishes the RF environment presented by the WD to a hearing aid. Telephone parameters WD signal quality Category ((signal + noise) to noise ratio in dB) Category T1 0 to 10 dB Category T2 10 to 20 dB Category T3 20 to 30 dB Category T4 > 30 dB Table 1 T-Coil Signal Quality Categories TEL : 886-3-327-3456 Page : 8 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 7. T-Coil Test Procedure Referenced to ANSI C63.19-2011, Section 7.4, This section describes the procedures used to measure the ABM (T-Coil) performance of the WD. In addition to measuring the absolute signal levels, the A-weighted magnitude of the unintended signal shall also be determined. To assure that the required signal quality is measured, the measurement of the intended signal and the measurement of the unintended signal must be made at the same location for each measurement position. In addition, the RF field strength at each measurement location must be at or below that required for the assigned category. Measurements shall not include undesired properties from the WD's RF field; therefore, use of a coaxial connection to a base station simulator or non-radiating load, there might still be RF leakage from the WD, which can interfere with the desired measurement. Pre-measurement checks should be made to avoid this possibility. All measurements shall be performed with the WD operating on battery power with an appropriate normal speech audio signal input level given in ANSI C63.19-2011 Table 7.1. If the device display can be turned off during a phone call, then that may be done during the measurement as well, Measurement shall be performed at two locations specified in ANSI C63.19-2011 A.3, with the correct probe orientation for a particular location, in a multistage sequence by first measuring the field intensity of the desired T-Coil signal the same location as the desired ABM or T-Coil signal (ABM1), and the ratio of desired to undesired magnetic components (ABM2) must be measured at the same location as the desired ABM or T-Coil signal (ABM1), and the ratio of desired to undesired ABM signals must be calculated. For the perpendicular field location, only the ABM1 frequency response shall be determined in a third measurement stage. The following steps summarize the basic test flow for determining ABM1 and ABM2. These steps assume that a sine wave or narrowband 1/3 octave signal can be used for the measurement of ABM1. a. A validation of the test setup and instrumentation may be performed using a TMFS or Helmholtz coil Measure the emissions and confirm that they are within the specified tolerance. b. Position the WD in the test setup and connect the WD RF connector to a base station simulator or a non-radiating load. Confirm that equipment that requires calibration has been calibrated, and that the noise level meets the requirements given in ANSI C63.19-2011 clause 7.3.1. c. The drive level to the WD ise set such that the reference input level specified in ANSI C63.19-2011 Table 7.1 is input to the base station simulator (or manufacturer's test mode equivalent) in 1 kHz, 1/3 octave band. This drive level shall be used for the T-Coil signal test (ABM1) at f = 1 kHz. Either a sine wave at 1025 Hz or a voice-like signal, band-limited to the 1 kHz 1/3 octave, as defined in ANSI C63.19-2011 clause 7.4.2, shall be used for the reference audio signal. If interference is found at 1025 Hz an alternative nearby reference audio signal frequency may be used. The same drive level shall be used for the ABM1 frequency response measurements at each 1/3 octave band center frequency. The WD volume control may be set at any level up to maximum, provided that a signal at any frequency at maximum modulation would not result in clipping or signal overload. d. Determine the magnetic measurement locations for the WD device (A.3), if not already specified by the manufacturer, as described in ANSI C63.19-2011 clause 7.4.4.1.1 and 7.4.4.2. e. At each measurement location, measure and record the desired T-Coil magnetic signals (ABM1 at fi) as described in ANSI C63.19-2011 clause 7.4.4.2 in each individual ISO 266-1975 R10 standard 1/3 octave band. The desired audio band input frequency (fi) shall be centered in each 1/3 octave band maintaining the same drive level as determined in item c) and the reading taken for that band. f. Equivalent methods of determining the frequency response may also be employed, such as fast Fourier transform (FFT) analysis using noise excitation or input-output comparison using simulated speech. The full-band integrated probe output, as specified in D.9, may be used, as long as the appropriate calibration curve is applied to the measured result, so as to yield an accurate measurement of the field magnitude. (The resulting measurement shall be an accurate measurement in dB A/m.) g. All Measurements of the desired signal shall be shown to be of the desired signal and not of an undesired signal. This may be shown by turning the desired signal ON and OFF with the probe measuring the same location. If the scanning method is used the scans shall show that all measurement points selected for the ABM1 measurement meet the ambient and test system noise criteria in ANSI C63.19-2011 clause 7.3.1. h. At the measurement location for each orientation, measure and record the undesired broadband audio magnetic signal (ABM2) as specified in ANSI C63.19-2011 clause 7.4.4.4 with no audio signal applied (or digital zero applied, if appropriate) using A-weighting and the half-band integrator. Calculate the ratio of the desired to undesired signal strength (i,e., signal quality). i. Obtain the data from the postprocessor, SEMCAD, and determine the category that properly classifies the signal quality based on ANSI C63.19-2011 Table 8.5. TEL : 886-3-327-3456 Page : 9 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 7.1 Test Flow Chart Fig. 2 T-Coil Signal Test flowchart TEL : 886-3-327-3456 Page : 10 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 7.2 Test Setup Diagram General Note: 1. Define the all applicable input audio level as below according to C63 and KDB 285076 D02v03: - GSM input level: -16dBm0 - UMTS input level: -16dBm0 - CDMA input level: -18dBm0 - VoLTE input level: -16dBm0 - VoWiFi input level: -20dBm0 - OTT VoIP input Level: -20dBm0 2. For GSM / UMTS / CDMA test setup and input level, the correct input level definition is via a communication tester CMU200’s “Decoder Cal” and “Codec Cal” with audio option B52 and B85 to set the correct audio input levels. 3. CMU200 is able to output 1kHz audio signal equivalent to 3.14dBm0 at "Decoder Cal." confuguration, the signal reference is used to adjust the AMMI gain setting to reach -16dBm0 for GSM/UMTS and -18dBm0 for CDMA. CMW500 input is calibrated and the relation between the analog input voltage and the internal level in dBm0 can be determined 4. The test setup used for VoLTE over IMS and VoWiFi over IMS is via the callbox of CMW500 for T-coil measurement, The data application unit of the CMW500 was used to simulate the IP multimedia subsystem server. The CMW500 can be manually configured to ensure and control the speech input level result is -16dBm0 for VoLTE, -20dBm0 for VoWiFi when the device during the IMS connection. 5. The test setup used for Google DUO VoIP call is via the data application unit on CMW500 connection to the Internet, also connection to the other auxiliary VoIP unit which is used to configure the audio codec and bit rate and also monitor the audio input level of -20dBm0. 6. The test setup used for SIP Calling is via the data application unit on CMW500 connection to the Internet, also connection to the other auxiliary VoIP unit which is used to configure the audio codec and bit rate and can be determined the audio input level of -20dBm0. TEL : 886-3-327-3456 Page : 11 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 1. The Required gain factor for the specific signal shall typically be multiplied by this factor to achieve approx. the same level as for the 1kHz sine signal 2. The below calculation formula is an example and showing how to determine the input level for the device. Calculation formula: - Audio Level at -16dBm0 = ((-16dBm0) – (3.14dBm0)) + X dBv - Calculated Gain at -16dBm0 = 10(( audio level at -16dBm0 – Y dBm0) / 20) * 10 - Gatting setting at -16dBm0 = required gain factor * calculated gain Gain Value 20* log(gain) AMCC Coil In Level (linear) dB (dBv RMS) dBm0 -2.47 3.14 10 20 -19.85 -14.24 8.17 18.24 -21.61 -16 Duration Peak to RMS RMS Required Gain Calculated Signal Type (s) (dB) (dB) Factor Gain Setting 1kHz sine - 3 0 1 8.17 48k_voice_1kHz 1 16.2 -12.7 4.33 35.36 48k_voice_300Hz ~ 3kHz 2 21.6 -18.6 8.48 69.25 TEL : 886-3-327-3456 Page : 12 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 7.3 Description of EUT Test Position Fig.3 illustrate the references and reference plane that shall be used in a typical EUT emissions measurement. The principle of this section is applied to EUT with similar geometry. Please refer to Appendix C for the setup photographs.  The area is 5 cm by 5 cm.  The area is centered on the audio frequency output transducer of the EUT.  The area is in a reference plane, which is defined as the planar area that contains the highest point in the area of the phone that normally rests against the user’s ear. It is parallel to the centerline of the receiver area of the phone and is defined by the points of the receiver-end of the EUT handset, which, in normal handset use, rest against the ear.  The measurement plane is parallel to, and 10 mm in front of, the reference plane. Fig.3 A typical EUT reference and plane for T-Coil measurements TEL : 886-3-327-3456 Page : 13 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 8. Test Equipment List Calibration Manufacturer Name of Equipment Type/Model Serial Number Last Cal. Due Date SPEAG Audio Magnetic 1D Field Probe AM1DV3 3130 Nov. 21, 2017 Nov. 20, 2018 SPEAG Data Acquisition Electronics DAE4 854 Jun. 14, 2018 Jun. 13, 2019 SPEAG Audio Magnetic Calibration Coil AMCC 1049 NCR NCR SPEAG Audio Measuring Instrument AMMI 1041 NCR NCR RCPTWN Thermometer HTC-1 TM685-1 Mar. 16, 2018 Mar. 15, 2019 SPEAG Test Arch Phantom N/A N/A NCR NCR SPEAG Phone Positioner N/A N/A NCR NCR R&S Base Station CMW500 115793 May. 24, 2018 May. 23, 2019 R&S Base Station CMU200 116457 May. 30, 2018 May. 29, 2019 Note: 1. NCR: “No-Calibration Required” TEL : 886-3-327-3456 Page : 14 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 9. T-Coil testing for CMRS Voice General Note: 1. Codec Investigation: For a voice service/air interface, investigate the variations of codec configurations (WB, NB bit rate) and document the parameters (ABM1, ABM2, S+N/N, frequency response) for that voice service. It is only necessary to document this for one channel/band, the following worst investigation codec would be remarked to be used for the testing for the handset. 2. Air Interface Investigation: a. Use the worst-case codec test and document a limited set of bands/channel/bandwidths. Observe the effect of changing the band and bandwidth to ensure that there are no unexpected variations. Using the knowledge of the observed variations, it is necessary to report only a set band/channel/bandwidth for each orientation for a voice service/air interface. b. According to the ANSI C63.19 2011 section 7.3.2, test middle channel of each frequency band for HAC testing for each orientation to determine worst HAC T-Coil rating. 9.1 GSM Tests Results <Codec Investigation> Codec FR_V1 HR_V1 Orientation Band / Channel ABM 1 (dBA/m) -0.0067 0.89 ABM 2 (dBA/m) -31.0667 -33.14 Axial GSM850 / 189 Signal Quality (dB) 31.06 34.03 Freq. Response Pass Pass Remark: According to codec investigation, the worst codec is FR_V1 <Air Interface Investigation> Signal Ambient Freq. Plot Probe ABM1 ABM2 T Frequency Air Interface Mode Channel Quality Noise Response No. Position dB (A/m) dB (A/m) Rating Response dB dB (A/m) Variation dB Axial (Z) -0.01 -31.07 31.06 T4 -50.33 1 GSM850 Voice 189 1.76 Pass Transversal (Y) -9.31 -46.27 36.96 T4 -50.23 Axial (Z) 1.10 -36.98 38.08 T4 -50.35 2 GSM1900 Voice 661 1.88 Pass Transversal (Y) -8.59 -48.65 40.06 T4 -50.21 TEL : 886-3-327-3456 Page : 15 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 9.2 UMTS Tests Results <Codec Investigation> Codec AMR 4.75Kbps AMR 7.95Kbps AMR 12.2Kbps Orientation Band / Channel ABM 1 (dBA/m) -2.28 -1.71 -1.37 ABM 2 (dBA/m) -46.52 -46.22 -48.69 Axial Band 5 / 4182 Signal Quality (dB) 44.24 44.51 47.32 Freq. Response Pass Pass Pass Remark: According to codec investigation, the worst codec is AMR 4.75Kbps <Air Interface Investigation> Signal Ambient Freq. Plot Probe ABM1 ABM2 T Frequency Air Interface Mode Channel Quality Noise Response No. Position dB (A/m) dB (A/m) Rating Response dB dB (A/m) Variation dB Axial (Z) -2.28 -46.52 44.24 T4 -50.34 3 WCDMA II Voice 9400 0.73 Pass Transversal (Y) -7.74 -49.60 41.86 T4 -50.22 Axial (Z) -1.04 -45.84 44.80 T4 -50.33 4 WCDMA IV Voice 1413 1.15 Pass Transversal (Y) -8.62 -49.61 40.99 T4 -50.26 Axial (Z) -1.38 -48.44 47.06 T4 -50.35 5 WCDMA V Voice 4182 0.88 Pass Transversal (Y) -7.67 -49.49 41.82 T4 -50.24 TEL : 886-3-327-3456 Page : 16 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 10. T-Coil testing for OTT VoIP Application General Notes: 1. According to the ANSI C63.19 2011 section 7.3.2, test middle channel of each frequency band for HAC testing for each orientation to determine worst HAC T-Coil rating. 2. The google Duo VoIP application are pre-installed on this device. According to KDB 285076 D02, all air interfaces via a data connection with VoIP application need to be considered HAC testing. 3. The Google Duo only support OPUS audio codec and support 6Kbps to 75Kbps bitrate. 4. The test setup used for OTT VoIP call is the DUT connect to the CMW500 and via the data application unit on CMW500 connection to the Internet, the Auxiliary EUT is connected to the WiFi access point, the channel/Modulation/Frequency bands/data rate is configured on the CMW500 for the DUT unit. For the Auxiliary VoIP unit which is used to configure the audio codec rate and determine the audio input level of -20dBm0 based on the KDB 285076 D02v03 requirement. 5. Codec Investigation: For a voice service/air interface, investigate the variations of codec configurations (WB, NB bit rate) and document the parameters (ABM1, ABM2, S+N/N, frequency response) for that voice service. It is only necessary to document this for one channel/band, the following tests results which the worst case codec would be remarked to be used for the testing for the handset. 6. Air Interface Investigation: a. Use the worst-case codec test and document a limited set of bands/channel/bandwidths. Observe the effect of changing the band and bandwidth to ensure that there are no unexpected variations. Using the knowledge of the observed variations, it is necessary to report only a set band/channel/bandwidth for each orientation for a voice service/air interface. b. Select LTE FDD / TDD one frequency band to do measurement at the worst SNR position was additionally performed with varying the BWs/Modulations/RB size to verify the variation to find out worst configuration , the observed variation is very little to be within 1 dB which is much less than the margin from the rating threshold. c. Select WLAN 2.4GHz one frequency band to do measurement at the worst SNR position was additionally performed with varying the BWs/Modulations/data rate to verify the variation to find out worst configuration , the observed variation is very little to be within 1 dB which is much less than the margin from the rating threshold. <Codec Investigation> EDGE Google Duo SIP Calling Opus Opus AMR NB GSM GSM_EFR PCMA PCMU Band / Codec Opus 6kbps Orientation 40kbps 75kbps 12.2 Kbit/s 13Kbit/s 12.2 Kbit/s 64 Kbit/s 64 Kbit/s Channel ABM 1 -3.43 -3.91 -3.43 1.08 0.64 0.76 0.65 0.62 (dBA/m) ABM 2 -34.59 -34.74 -34.06 -29.98 -30.72 -30.6 -31.03 -30.94 (dBA/m) GSM850 / Axial Signal 189 31.16 30.83 30.63 31.06 31.36 31.36 31.68 31.56 Quality (dB) Freq. Pass Pass Pass Pass Pass Pass Pass Pass Response Remark: According to codec investigation, the worst codec bitrate is Opus 75kbps HSPA Google Duo SIP Calling Opus Opus AMR NB GSM GSM_EFR PCMA PCMU Band / Codec Opus 6kbps Orientation 40kbps 75kbps 12.2 Kbit/s 13Kbit/s 12.2 Kbit/s 64 Kbit/s 64 Kbit/s Channel ABM 1 -4.87 -4.79 -6.01 -5.07 -4.86 -4.24 -4.21 -4.29 (dBA/m) ABM 2 -43.14 -42.79 -40.74 -44.23 -44.16 -44.28 -41.32 -43.49 (dBA/m) UMTS B2 / Axial Signal 9400 38.27 38 34.73 39.16 39.3 40.04 37.11 39.2 Quality (dB) Freq. Pass Pass Pass Pass Pass Pass Pass Pass Response Remark: According to codec investigation, the worst codec bitrate is Opus 75kbps TEL : 886-3-327-3456 Page : 17 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B LTE FDD Google Duo SIP Calling Opus Opus AMR NB GSM GSM_EFR PCMA PCMU Band / Codec Opus 6kbps Orientation 40kbps 75kbps 12.2 Kbit/s 13Kbit/s 12.2 Kbit/s 64 Kbit/s 64 Kbit/s Channel ABM 1 -5.49 -4.37 -4.82 -4.77 -4.65 -4.54 -5.05 -4.46 (dBA/m) ABM 2 -41 -40.09 -40.21 -40.53 -40.15 -40.4 -41.12 -40.04 (dBA/m) B2 / 20M / Axial Signal 18900 35.51 35.72 35.39 35.76 35.5 35.86 36.07 35.58 Quality (dB) Freq. Pass Pass Pass Pass Pass Pass Pass Pass Response Remark: According to codec investigation, the worst codec bitrate is Opus 75kbps LTE TDD Google Duo SIP Calling Opus Opus AMR NB GSM GSM_EFR PCMA PCMU Band / Codec Opus 6kbps Orientation 40kbps 75kbps 12.2 Kbit/s 13Kbit/s 12.2 Kbit/s 64 Kbit/s 64 Kbit/s Channel ABM 1 -3.84 -3.94 -4.16 -3.5 -3.22 -3.87 -2.98 -2.75 (dBA/m) ABM 2 -32.61 -32.58 -31.82 -33.71 -39.05 -33.25 -32.88 -33.24 (dBA/m) B41 / 20M / Axial Signal 40620 28.77 28.64 27.66 30.21 35.83 29.38 29.9 30.49 Quality (dB) Freq. Pass Pass Pass Pass Pass Pass Pass Pass Response Remark: According to codec investigation, the worst codec bitrate is Opus 75kbps WLAN Google Duo SIP Calling Opus Opus AMR NB GSM GSM_EFR PCMA PCMU Band / Codec Opus 6kbps Orientation 40kbps 75kbps 12.2 Kbit/s 13Kbit/s 12.2 Kbit/s 64 Kbit/s 64 Kbit/s Channel ABM 1 -5.6 -4.15 -5.82 -5.33 -6.52 -5.1 -5.73 -6.04 (dBA/m) ABM 2 -37.36 -37.12 -34.42 -35.59 -38.11 -36.57 -40.01 -41.35 (dBA/m) WLAN2.4G / Axial Signal 6 31.76 32.97 28.6 30.26 31.59 31.47 34.28 35.31 Quality (dB) Freq. Pass Pass Pass Pass Pass Pass Pass Pass Response Remark: According to codec investigation, the worst codec bitrate is Opus 75kbps TEL : 886-3-327-3456 Page : 18 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B <Air Interface Investigation> Signal BW RB RB UL-DL ABM1 ABM2 Air Interface Modulation Channel Quality (MHz) Size offset Configuration dB (A/m) dB (A/m) dB LTE B2 20 QPSK 1 0 18900 -4.17 -37.48 33.31 LTE B2 20 QPSK 50 0 18900 -3.45 -37.01 33.56 LTE B2 20 QPSK 100 0 18900 -3.73 -37.53 33.80 LTE B2 20 16QAM 1 0 18900 -4.17 -37.61 33.44 LTE B2 20 64QAM 1 0 18900 -2.97 -37.56 34.59 FDD LTE B2 15 QPSK 1 0 18900 -4.03 -37.37 33.34 LTE B2 10 QPSK 1 0 18900 -4.16 -37.51 33.35 LTE B2 5 QPSK 1 0 18900 -4.18 -37.63 33.45 LTE B2 3 QPSK 1 0 18900 -4.11 -37.48 33.37 LTE B2 1.4 QPSK 1 0 18900 -4.09 -38.04 33.95 LTE B41 20 QPSK 1 0 40670 0 -4.82 -33.32 28.50 LTE B41 20 QPSK 50 0 40670 0 -4.91 -33.88 28.97 LTE B41 20 QPSK 100 0 40670 0 -4.88 -33.48 28.60 LTE B41 20 16QAM 1 0 40670 0 -4.95 -33.72 28.77 LTE B41 20 64QAM 1 0 40670 0 -4.84 -33.61 28.77 LTE B41 15 QPSK 1 0 40670 0 -4.81 -33.52 28.71 LTE B41 10 QPSK 1 0 40670 0 -4.84 -33.78 28.94 TDD LTE B41 5 QPSK 1 0 40670 0 -4.95 -33.46 28.51 LTE B41 20 QPSK 1 0 40670 1 -4.88 -33.42 28.54 LTE B41 20 QPSK 1 0 40670 2 -4.76 -33.73 28.97 LTE B41 20 QPSK 1 0 40670 3 -4.84 -33.56 28.72 LTE B41 20 QPSK 1 0 40670 4 -4.79 -33.59 28.80 LTE B41 20 QPSK 1 0 40670 5 -4.86 -33.72 28.86 LTE B41 20 QPSK 1 0 40670 6 -4.88 -33.45 28.57 Signal BW ABM1 ABM2 Air Interface Mode Channel Quality (MHz) dB (A/m) dB (A/m) dB 802.11b 20 1M 6 -4.95 -33.59 28.64 802.11b 20 11M 6 -4.85 -33.72 28.87 802.11g 20 6M 6 -4.83 -33.52 28.69 802.11g 20 54M 6 -4.69 -33.42 28.73 802.11n-HT20 20 MCS0 6 -4.94 -33.77 28.83 802.11n-HT20 20 MCS7 6 -4.87 -33.53 28.66 802.11n-HT40 40 MCS0 6 -4.75 -33.42 28.67 802.11n-HT40 40 MCS7 6 -4.65 -33.42 28.77 TEL : 886-3-327-3456 Page : 19 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B Freq. ABM1 ABM2 Signal Ambient Plot Probe T Response Frequency Air Interface Mode Channel dB dB Quality Noise No. Position Rating Variation Response (A/m) (A/m) dB dB (A/m) dB Axial (Z) -3.43 -34.06 30.63 T4 -50.33 6 GSM850 EDGE 2 Tx slots 189 1.48 Pass Transversal (Y) -13.06 -43.89 30.83 T4 -50.26 Axial (Z) -4.80 -33.87 29.07 T3 -50.30 7 GSM1900 EDGE 2 Tx slots 661 0.69 Pass Transversal (Y) -11.42 -44.55 33.13 T4 -50.21 Axial (Z) -6.01 -40.74 34.73 T4 -50.32 8 WCDMA II HSPA 9400 1 Pass Transversal (Y) -15.78 -47.18 31.40 T4 -50.24 Axial (Z) -7.34 -37.18 29.84 T3 -50.32 9 WCDMA IV HSPA 1413 1.49 Pass Transversal (Y) -11.79 -40.42 28.63 T3 -50.23 Axial (Z) -7.64 -37.42 29.78 T3 -50.31 10 WCDMA V HSPA 4182 1.48 Pass Transversal (Y) -13.01 -41.15 28.14 T3 -50.22 Axial (Z) -4.82 -40.21 35.39 T4 -50.35 11 LTE Band 2 20M_QPSK_1_0 18900 0.97 Pass Transversal (Y) -12.70 -43.49 30.79 T4 -50.25 Axial (Z) -4.94 -38.58 33.64 T4 -50.35 12 LTE Band 4 20M_QPSK_1_0 20175 1.11 Pass Transversal (Y) -12.61 -43.51 30.90 T4 -50.25 Axial (Z) -5.29 -37.65 32.36 T4 -50.39 13 LTE Band 7 20M_QPSK_1_0 21100 0.98 Pass Transversal (Y) -12.29 -43.24 30.95 T4 -50.28 Axial (Z) -5.10 -38.37 33.27 T4 -50.36 14 LTE Band 12 10M_QPSK_1_0 23095 0.82 Pass Transversal (Y) -12.36 -42.82 30.46 T4 -50.26 Axial (Z) -4.91 -38.70 33.79 T4 -50.37 15 LTE Band 26 15M_QPSK_1_0 26865 0.95 Pass Transversal (Y) -13.09 -43.23 30.14 T4 -50.24 Axial (Z) -4.16 -31.82 27.66 T3 -50.33 16 LTE Band 41 20M_QPSK_1_0 40670 2 Pass Transversal (Y) -13.12 -42.11 28.99 T3 -50.25 Axial (Z) -5.82 -34.42 28.60 T3 -50.38 17 WLAN2.4GHz 802.11b 1Mbps 6 1.39 Pass Transversal (Y) -13.40 -43.86 30.46 T4 -50.24 Remark: 1. Phone Condition: Mute on; Backlight off; Max Volume 2. The detail frequency response results please refer to appendix A. 3. Test Engineer：San Lin and Nick Yu. TEL : 886-3-327-3456 Page : 20 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 11. Uncertainty Assessment The evaluation of uncertainly by the statistical analysis of a series of observations is termed a Type A evaluation of uncertainty. The evaluation of uncertainty by means other than the statistical analysis of a series of observation is termed a Type B evaluation of uncertainty. Each component of uncertainty, however evaluated, is represented by an estimated standard deviation, termed standard uncertainty, which is determined by the positive square root of the estimated variance. The combined standard uncertainty of the measurement result represents the estimated standard deviation of the result. It is obtained by combining the individual standard uncertainties of both Type A and Type B evaluation using the usual “root-sum-squares” (RSS) methods of combining standard deviations by taking the positive square root of the estimated variances. Expanded uncertainty is a measure of uncertainty that defines an interval about the measurement result within which the measured value is confidently believed to lie. It is obtained by multiplying the combined standard uncertainty by a coverage factor. For purpose of this document, a coverage factor two is used, which corresponds to confidence interval of about 95 %. The DASY uncertainty Budget is showed in Table 8.2. Uncertainty Standard Standard Probability Ci Ci Error Description Value Divisor Uncertainty Uncertainty Distribution (ABM1) (ABM2) (±%) (ABM1) (ABM2) Probe Sensitivity Reference Level 3.0 Normal 1 1 1 ± 3.0 % ± 3.0 % AMCC Geometry 0.4 Rectangular √3 1 1 ± 0.2 % ± 0.2 % AMCC Current 1.0 Rectangular √3 1 1 ± 0.6 % ± 0.6 % Probe Positioning During 0.1 Rectangular √3 1 1 ± 0.1 % ± 0.1 % Calibrate Noise Contribution 0.7 Rectangular √3 0.0143 1 ± 0.0 % ± 0.4 % Frequency Slope 5.9 Rectangular √3 0.1 1 ± 0.3 % ± 3.5 % Probe System Repeatability / Drift 1.0 Rectangular √3 1 1 ± 0.6 % ± 0.6 % Linearity / Dynamic Range 0.6 Rectangular √3 1 1 ± 0.4 % ± 0.4 % Acoustic Noise 1.0 Rectangular √3 0.1 1 ± 0.1 % ± 0.6 % Probe Angle 2.3 Rectangular √3 1 1 ± 1.4 % ± 1.4 % Spectral Processing 0.9 Rectangular √3 1 1 ± 0.5 % ± 0.5 % Integration Time 0.6 Normal 1 1 5 ± 0.6 % ± 3.0 % Field Disturbation 0.2 Rectangular √3 1 1 ± 0.1 % ± 0.1 % Test Signal Reference Signal Spectral 0.6 Rectangular √3 0 1 ± 0.0 % ± 0.4 % Response Positioning Probe Positioning 1.9 Rectangular √3 1 1 ± 1.1 % ± 1.1 % Phantom Thickness 0.9 Rectangular √3 1 1 ± 0.5 % ± 0.5 % EUT Positioning 1.9 Rectangular √3 1 1 ± 1.1 % ± 1.1 % External Contributions RF Interference 0.0 Rectangular √3 1 0.3 ± 0.0 % ± 0.0 % Test Signal Variation 2.0 Rectangular √3 1 1 ± 1.2 % ± 1.2 % Combined Standard Uncertainty ± 4.1 % ± 6.1 % Coverage Factor for 95 % K=2 Expanded Uncertainty ± 8.1 % ± 12.3 % Table 8.2 Uncertainty Budget of audio band magnetic measurement TEL : 886-3-327-3456 Page : 21 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516

HAC T-COIL TEST REPORT Report No. : HA871955B 12. References [1] ANSI C63.19-2011, “American National Standard for Methods of Measurement of Compatibility between Wireless Communications Devices and Hearing Aids”, 27 May 2011. [2] FCC KDB 285076 D01v05, “Equipment Authorization Guidance for Hearing Aid Compatibility”, Sep 2017 [3] FCC KDB 285076 D02v03, “Guidance for performing T-Coil tests for air interfaces supporting voice over IP (e.g., LTE and WiFi) to support CMRS based telephone services”, Sep 2017 [4] FCC KDB 285076 D03v01, “Hearing aid compatibility frequently asked questions”, Sep 2017 [5] SPEAG DASY System Handbook TEL : 886-3-327-3456 Page : 22 of 22 FAX : 886-3-328-4978 Issued Date : Nov. 22, 2018 Form version: 180516


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