IHDT56XC4 T-coil Test Report

FCC ID: IHDT56XC4

Test Report

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FCCID_3776617

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B Hearing Aid Compatibility (HAC) T-Coil Test Report APPLICANT : Motorola Mobility LLC EQUIPMENT : Mobile Cellular Phone BRAND NAME : Motorola MODEL NAME : XT1921-2 FCC ID : IHDT56XC4 T-RATING : T4 STANDARD : FCC 47 CFR §20.19 ANSI C63.19-2011 We, SPORTON INTERNATIONAL INC., would like to declare that the tested sample has been evaluated in accordance with the procedures and shown the compliance with the applicable technical standards. The test results in this report apply exclusively to the tested model / sample. Without written approval of SPORTON INTERNATIONAL INC., the test report shall not be reproduced except in full. Reviewed by: Eric Huang / Manager Approved by: Jones Tsai / Manager SPORTON INTERNATIONAL INC. No.52, Hwa Ya 1st Rd., Hwa Ya Technology Park, Kwei-Shan District, Taoyuan City, Taiwan (R.O.C.) SPORTON INTERNATIONAL INC. Page Number : 1 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B Table of Contents 1. Attestation of Test Summary..................................................................................................................................... 4 2. General Information ................................................................................................................................................... 5 3. Administration Data ................................................................................................................................................... 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 ........................................................................................................................................15 9.3 VoLTE Tests Results ........................................................................................................................................16 9.4 VoWiFi Tests Results .......................................................................................................................................18 10. T-Coil testing for OTT VoIP Calling ..........................................................................................................................19 11. Uncertainty Assessment ..........................................................................................................................................20 12. References .................................................................................................................................................................21 Appendix A. Plots of T-Coil Measurement Appendix B. DASY Calibration Certificate SPORTON INTERNATIONAL INC. Page Number : 2 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B Revision History REPORT NO. VERSION DESCRIPTION ISSUED DATE HA7D2018-02B Rev. 01 Initial issue of report Feb. 23, 2018 SPORTON INTERNATIONAL INC. Page Number : 3 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 1. Attestation of Test Summary Frequency Magnetic Air Interface Band MHz T-Rating Response Intensity GSM850 T3 Pass Pass GSM CMRS Voice GSM1900 T4 Pass Pass EDGE850 T4 Pass Pass OTT over EDGE EDGE1900 T4 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 T4 Pass Pass Band 5 T4 Pass Pass Band 2 T4 Pass Pass Band 4 T4 Pass Pass Band 5 T4 Pass Pass Band 12 T4 Pass Pass VoLTE Band 14 T4 Pass Pass Band 17 T4 Pass Pass Band 30 T4 Pass Pass Band 66 T4 Pass Pass OTT over LTE Band 30 T4 Pass Pass 2450 T4 Pass Pass 5200 T4 Pass Pass VoWiFI 5300 T4 Pass Pass 5500 T4 Pass Pass 5800 T4 Pass Pass 2450 T4 Pass Pass OTT over WiFi 5800 T4 Pass Pass Date Tested 2018/1/8 ~ 2018/2/12 The device is compliance with HAC limits specified in guidelines FCC 47CFR §20.19 and ANSI Standard ANSI C63.19. SPORTON INTERNATIONAL INC. Page Number : 4 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 2. General Information Product Feature & Specification Applicant Name Motorola Mobility LLC Equipment Name Mobile Cellular Phone Brand Name Motorola Model Name XT1921-2 FCC ID IHDT56XC4 HW Version DVT1B EUT Stage Identical Prototype Exposure category General Population/Uncontrolled Exposure 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 LTE Band 12: 699.7 MHz ~ 715.3 MHz Frequency Band LTE Band 14: 790.5 MHz ~ 795.5 MHz LTE Band 17: 706.5 MHz ~ 713.5 MHz LTE Band 30: 2307.5 MHz ~ 2312.5 MHz LTE Band 66: 1710.7 MHz ~ 1779.3 MHz WLAN 2.4GHz Band: 2412 MHz ~ 2462 MHz WLAN 5.2GHz Band: 5180 MHz ~ 5240 MHz WLAN 5.3GHz Band: 5260 MHz ~ 5320 MHz WLAN 5.5GHz Band: 5500 MHz ~ 5720 MHz WLAN 5.8GHz Band: 5745 MHz ~ 5825 MHz Bluetooth: 2402 MHz ~ 2480 MHz GSM/GPRS/EGPRS RMC/AMR 12.2Kbps HSDPA HSUPA Mode DC-HSDPA LTE: QPSK, 16QAM WLAN 2.4GHz : 802.11b/g/n HT20 WLAN 5GHz : 802.11a/n HT20/HT40 Bluetooth BR/EDR/LE SPORTON INTERNATIONAL INC. Page Number : 5 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 3. Administration Data 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, Hwa Ya 1st Rd., Hwa Ya Technology Park, Kwei-Shan District, 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 Applicant Company Name Motorola Mobility LLC Address 222 W,Merchandise Mart Plaza, Chicago IL 60654 USA Manufacturer Company Name Motorola Mobility LLC Address 222 W,Merchandise Mart Plaza, Chicago IL 60654 USA 4. Applied Standards ‧ FCC CFR47 Part 20.19 ‧ ANSI C63.19-2011 ‧ FCC KDB 285076 D01 HAC Guidance v05 ‧ FCC KDB 285076 D02 T Coil testing v03 SPORTON INTERNATIONAL INC. Page Number : 6 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 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 VD Yes WLAN, BT Google Duo(1) No EDGE1900 850 WLAN, BT No 1750 VO Yes WLAN, BT CMRS Voice No UMTS 1900 WLAN, BT No HSPA VD Yes WLAN, BT Google Duo(1) No Band 2 WLAN, BT No Band 4 WLAN, BT No Band 5 WLAN, BT No Band 12 WLAN, BT VoLTE No LTE VD Yes / (FDD) Band 14 WLAN, BT No Google Duo(1) Band 17 WLAN, BT No Band 30 WLAN, BT No Band 66 WLAN, BT No 2450 No 5200 VoWiFi On Wi-Fi 5300 VD Yes GSM,WCDMA,LTE / On 5500 Google Duo(1) On 5800 On 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. SPORTON INTERNATIONAL INC. Page Number : 7 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 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 SPORTON INTERNATIONAL INC. Page Number : 8 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 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. SPORTON INTERNATIONAL INC. Page Number : 9 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 7.1 Test Flow Chart Fig. 2 T-Coil Signal Test flowchart SPORTON INTERNATIONAL INC. Page Number : 10 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 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 OTT 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. SPORTON INTERNATIONAL INC. Page Number : 11 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 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 air interface for the device. <An example for determine input level> - 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 -2.39 3.14 10 20 -19.93 -14.40 8.32 18.40 -21.53 -16 Duration Peak to RMS RMS Required Gain Calculated Signal Type (s) (dB) (dB) Factor Gain Setting 1kHz sine - 3 0 1 8.32 48k_voice_1kHz 1 16.2 -12.7 4.33 36.02 48k_voice_300Hz ~ 3kHz 2 21.6 -18.6 8.48 70.53 SPORTON INTERNATIONAL INC. Page Number : 12 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 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 SPORTON INTERNATIONAL INC. Page Number : 13 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 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 May. 02, 2017 May. 01, 2018 SPEAG Data Acquisition Electronics DAE4 778 May. 22, 2017 May. 21, 2018 SPEAG Audio Magnetic Calibration Coil AMCC 1049 NCR NCR SPEAG Audio Measuring Instrument AMMI 1041 NCR NCR SPEAG Test Arch Phantom N/A N/A NCR NCR SPEAG Phone Positioner N/A N/A NCR NCR Gencom Thermometer TE1 TM685-1 Mar. 21, 2017 Mar. 20, 2018 Gencom Thermometer TE1 TM685-2 Mar. 21, 2017 Mar. 20, 2018 R&S Base Station CMU200 116457 May. 23, 2017 May. 22, 2018 R&S Base Station CMW500 157119 Jun. 18, 2017 Jun. 17, 2018 Note: 1. NCR: “No-Calibration Required” SPORTON INTERNATIONAL INC. Page Number : 14 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 9. T-Coil testing for CMRS Voice General Note: 1. The middle channel of each frequency band is used for T-Coil testing according ANSI C63.19 2011. 2. For VoLTE or VoWiFi radio configuration investigation is choose either one codec and an investigation was performed on all frequency band, data rates and modulations and RB configuration to determine the radio configuration to be used for testing, the following tests results which the worst case configuration would be remarked to be used for the testing for the handset. 3. Choose worst case from radio configuration investigation. After investigation was performed to determine the audio codec configuration to be used for testing, the following tests results which the worst case codec would be remarked to be used for the testing for the handset. 4. For VoWiFi codec selection, due to the same with VoLTE codec configuration, therefore, worst codec is choose from VoLTE codec investigation to be used for others air interfaces testing of VoWiFi. 9.1 GSM Tests Results <Codec Investigation> Codec FR VR HR V1 Orientation Band / Channel ABM 1 (dBA/m) 0.32 1.72 ABM 2 (dBA/m) -27.24 -29.27 Axial GSM850 / 189 Freq. Response Pass Pass Signal Quality (dB) 27.56 30.99 <Summary Tests Results> Signal Plot Probe ABM1 ABM2 T Frequency Air Interface Mode Channel Quality No. Position dB (A/m) dB (A/m) Rating Response (dB) Axial (Z) 0.07 -27.45 27.52 T3 1 GSM850 CMRS Voice 189 PASS Transversal (Y) -10.46 -41.44 30.98 T4 Axial (Z) 0.40 -33.44 33.84 T4 2 GSM1900 CMRS Voice 661 PASS Transversal (Y) -10.13 -45.61 35.48 T4 9.2 UMTS Tests Results <Codec Investigation> Codec AMR12.2kbps AMR7.95kbps AMR4.75kbps Orientation Band / Channel ABM 1 (dBA/m) 1.76 1.10 1.19 ABM 2 (dBA/m) -40.88 -41.83 -40.58 Axial Band 2 / 9400 Freq. Response Pass Pass Pass Signal Quality (dB) 42.64 42.93 41.77 <Summary Tests Results> Signal Plot Probe ABM1 ABM2 T Frequency Air Interface Mode Channel Quality No. Position dB (A/m) dB (A/m) Rating Response (dB) Axial (Z) 0.86 -43.60 44.46 T4 3 WCDMA II AMR 4.75Kbps 9400 PASS Transversal (Y) -9.86 -47.57 37.71 T4 Axial (Z) 0.84 -42.79 43.63 T4 4 WCDMA IV AMR 4.75Kbps 1413 PASS Transversal (Y) -9.81 -47.40 37.59 T4 Axial (Z) 0.96 -43.37 44.33 T4 5 WCDMA V AMR 4.75Kbps 4182 PASS Transversal (Y) -10.09 -47.71 37.62 T4 SPORTON INTERNATIONAL INC. Page Number : 15 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 9.3 VoLTE Tests Results <Radio Configuration Investigation> Signal Bandwidth ABM1 ABM2 Air Interface Modulation RB size RB offset channel Quality (MHz) dB (A/m) dB (A/m) (dB) LTE B2 20 QPSK 1 0 18900 -0.34 -37.30 36.96 LTE B2 20 QPSK 50 0 18900 -0.16 -37.96 37.80 LTE B2 20 QPSK 100 0 18900 -0.18 -38.35 38.17 LTE B2 20 16QAM 1 0 18900 -0.48 -38.37 37.89 LTE B2 15 QPSK 1 0 18900 -0.61 -38.38 37.77 LTE B2 10 QPSK 1 0 18900 -0.29 -38.12 37.83 LTE B2 5 QPSK 1 0 18900 -0.66 -38.65 37.99 LTE B2 3 QPSK 1 0 18900 -0.73 -38.77 38.04 LTE B2 1.4 QPSK 1 0 18900 -0.59 -38.76 38.17 <AMR Codec Investigation> NB AMR WB AMR NB AMR WB AMR Band / BW / Codec Orientation 4.75Kbps 6.60Kbps 12.2Kbps 23.85Kbps Channel ABM 1 (dBA/m) 2.30 2.45 2.19 2.20 ABM 2 (dBA/m) -37.94 -37.88 -37.44 -38.02 Axial B2 / 20M / 18900 Freq. Response Pass Pass Pass Pass Signal Quality (dB) 40.24 40.33 39.63 40.22 <EVS Codec Investigation> EVS SWB EVS SWB EVS WB EVS WB EVS NB EVS NB Band / BW / Codec Orientation 9.6Kbps 13.2Kbps 5.9Kbps 13.2Kbps 5.9Kbps 13.2Kbps Channel ABM 1 (dBA/m) 2.29 2.23 2.29 2.20 2.22 2.17 ABM 2 (dBA/m) -37.46 -38.17 -37.65 -38.00 -37.87 -38.12 B2 / 20M / Axial Freq. Response Pass Pass Pass Pass Pass Pass 18900 Signal Quality (dB) 39.75 40.40 39.94 40.20 40.09 40.29 SPORTON INTERNATIONAL INC. Page Number : 16 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B <Summary Tests Results> ABM1 ABM2 Signal Plot Probe T Frequency Air Interface Mode Channel dB dB Quality No. Position Rating Response (A/m) (A/m) (dB) Axial (Z) 2.19 -37.44 39.63 T4 6 LTE Band 2 20M_QPSK_1RB_0offset_AMR 12.2Kbps 18900 Pass Transversal (Y) -9.26 -46.09 36.83 T4 Axial (Z) 2.07 -37.94 40.01 T4 7 LTE Band 4 20M_QPSK_1RB_0offset_AMR 12.2Kbps 20175 Pass Transversal (Y) -8.84 -45.96 37.12 T4 Axial (Z) 1.85 -39.89 41.74 T4 8 LTE Band 5 10M_QPSK_1RB_0offset_AMR 12.2Kbps 20525 Pass Transversal (Y) -9.16 -45.27 36.11 T4 Axial (Z) 2.08 -39.97 42.05 T4 9 LTE Band 12 10M_QPSK_1RB_0offset_AMR 12.2Kbps 23095 Pass Transversal (Y) -7.28 -44.70 37.42 T4 Axial (Z) -0.22 -40.70 40.48 T4 10 LTE Band 14 10M_QPSK_1RB_0offset_AMR 12.2Kbps 23330 Pass Transversal (Y) -9.47 -44.78 35.31 T4 Axial (Z) -0.33 -40.39 40.06 T4 11 LTE Band 17 10M_QPSK_1RB_0offset_AMR 12.2Kbps 23790 Pass Transversal (Y) -10.22 -45.71 35.49 T4 Axial (Z) -0.33 -39.34 39.01 T4 12 LTE Band 30 10M_QPSK_1RB_0offset_AMR 12.2Kbps 27710 Pass Transversal (Y) -11.84 -45.83 33.99 T4 Axial (Z) 2.08 -38.06 40.14 T4 13 LTE Band 66 20M_QPSK_1RB_0offset_AMR 12.2Kbps 132322 Pass Transversal (Y) -9.41 -46.63 37.22 T4 SPORTON INTERNATIONAL INC. Page Number : 17 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 9.4 VoWiFi Tests Results <Radio Configuration Investigation> ABM1 ABM2 Signal Quality Air Interface Bandwidth Data rate channel dB (A/m) dB (A/m) (dB) 802.11b 20 1M 6 6.69 -33.94 40.63 802.11b 20 11M 6 6.80 -34.83 41.63 802.11g 20 6M 6 6.77 -34.86 41.63 802.11g 20 54M 6 6.73 -34.85 41.58 802.11n 20 MCS0 6 6.75 -35.00 41.75 802.11n 20 MCS7 6 6.76 -35.42 42.18 802.11a 20 6M 40 6.53 -36.53 43.06 802.11a 20 54M 40 6.57 -37.28 43.85 802.11an-HT20 20 MCS0 40 6.56 -37.07 43.63 802.11an-HT20 20 MCS7 40 6.56 -37.16 43.72 802.11an-HT40 40 MCS0 40 6.49 -37.18 43.67 802.11an-HT40 40 MCS7 40 6.60 -37.14 43.74 <Summary Tests Results> Signal Plot Probe ABM1 ABM2 T Frequency Air Interface Mode Channel Quality No. Position dB (A/m) dB (A/m) Rating Response (dB) Axial (Z) 4.65 -38.51 43.16 T4 14 2.4GHz WLAN 802.11b 1Mbps 6 Pass Transversal (Y) -6.62 -45.63 39.01 T4 Axial (Z) 5.53 -41.06 46.59 T4 15 5.2GHz WLAN 802.11a 6Mbps 40 Pass Transversal (Y) -2.22 -44.58 42.36 T4 Axial (Z) 5.86 -40.69 46.55 T4 16 5.3GHz WLAN 802.11a 6Mbps 60 Pass Transversal (Y) -2.16 -44.51 42.35 T4 Axial (Z) 5.83 -40.74 46.57 T4 17 5.5GHz WLAN 802.11a 6Mbps 124 Pass Transversal (Y) -2.52 -44.70 42.18 T4 Axial (Z) 5.53 -40.60 46.13 T4 18 5.8GHz WLAN 802.11a 6Mbps 157 Pass Transversal (Y) -2.52 -44.85 42.33 T4 SPORTON INTERNATIONAL INC. Page Number : 18 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 10. T-Coil testing for OTT VoIP Calling General Notes: 1. The google Duo VoIP call software is pre-installed on this device and head-to-ear scenario should be consideration, the google Duo only support OPUS audio codec and support 6Kbpa to 75Kbps bitrate. According to KDB 285076 D02, all air interfaces via a data connection with google Duo VoIP calling would be consideration to be tested. 2. The test setup used for OTT 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 3. According to VoLTE and VoWiFi radio configuration investigation, the worst case radio configuration is used for OTT over LTE and OTT over WiFi testing. 4. Due to OTT service and CMRS IP service are all be established over the internet protocol for the voice service, and on both services use the identical RF air interface for the WIFI and LTE, therefore according to VOLTE and VoWiFi summary test results, the worst case air interface is used for OTT T-Coil testing 5. For OTT VoIP codec investigation test reduction, due to all air interface have the same codec configuration, therefore, the codec investigation was choose UMTS B2 to determine the audio codec configuration to be used for others air interfaces testing. <Codec Investigation> Bitrate Bitrate Bitrate Codec Orientation Band / Channel 6Kbps 40Kbps 75Kbps ABM 1 (dBA/m) 5.16 5.75 6.21 ABM 2 (dBA/m) -37.08 -36.91 -36.21 Axial UMTS B2 / 9400 Freq. Response Pass Pass Pass Signal Quality (dB) 42.24 42.66 42.42 <Summary Tests Results> ABM1 ABM2 Signal Plot Probe T Frequency Air Interface Mode Channel dB dB Quality No. Position Rating Response (A/m) (A/m) (dB) Axial (Z) 6.57 -33.29 39.86 T4 19 GSM850 EDGE 2 Tx slots 189 Pass Transversal (Y) -3.49 -44.28 40.79 T4 Axial (Z) -2.23 -40.85 38.62 T4 20 GSM1900 EDGE 2 Tx slots 661 Pass Transversal (Y) -7.81 -41.50 33.69 T4 Axial (Z) 5.16 -37.08 42.24 T4 21 WCDMA II HSPA 9400 Pass Transversal (Y) -3.20 -44.77 41.57 T4 Axial (Z) 5.98 -37.07 43.05 T4 22 WCDMA IV HSPA 1413 Pass Transversal (Y) -3.60 -46.66 43.06 T4 Axial (Z) 3.05 -36.91 39.96 T4 23 WCDMA V HSPA 4182 Pass Transversal (Y) -3.30 -45.99 42.69 T4 Axial (Z) 6.32 -35.18 41.50 T4 24 LTE Band 30 10M_QPSK_1RB_0offset 27710 Pass Transversal (Y) -2.64 -43.88 41.24 T4 Axial (Z) 5.77 -38.00 43.77 T4 25 WLAN2.4GHz 802.11b 1Mbps 6 Pass Transversal (Y) -5.80 -46.25 40.45 T4 Axial (Z) 5.51 -40.79 46.30 T4 26 WLAN5GHz 802.11a 6Mbps 124 Pass Transversal (Y) -2.49 -44.75 42.26 T4 Remark: 1. Phone Condition: Mute on; Backlight off; Max Volume 2. The detail frequency response results please refer to appendix A. 3. Test Engineer：Nick Yu and Tom Jiang SPORTON INTERNATIONAL INC. Page Number : 19 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 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 SPORTON INTERNATIONAL INC. Page Number : 20 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4

FCC HAC T-Coil Test Report Report No. : HA7D2018-02B 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] SPEAG DASY System Handbook SPORTON INTERNATIONAL INC. Page Number : 21 of 21 TEL : 886-3-327-3456 Report Issued Date : Feb. 23, 2018 FAX : 886-3-328-4978 Report Version : Rev. 01 FCC ID : IHDT56XC4


Document Created: 2018-04-07 19:53:13
Document Modified: 2018-04-07 19:53:13
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