EM7355 Module FCC MPE Evaluation v2

FCC ID: N7NEM7655

RF Exposure Info

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FCCID_1897655

MPE Evaluation for EM7355 Radio Module February 5, 2013

1. Introduction In this application we seek for modular approval to the EM7355 wireless modem for use in standalone and collocated simultaneous transmission under mobile configuration. This Maximum Permissive Exposure (MPE) report demonstrates compliance analysis for EM7355 wireless modem with FCC CFR 47 §2.1091 and IC RSS-102 for standalone and collocated transmission in mobile exposure conditions. The MPE analysis is limited for US / Canada bands only. The general population/uncontrolled exposure limits are applicable to situations in which the general public may be exposed or in which persons who are exposed as a consequence of their employment may not be made fully aware of the potential for exposure or cannot exercise control over their exposure. Any collocated transmitter must have a valid FCC ID documenting equivalent or degraded RF characteristics with the collocated parameters defined in this MPE report. A separation distance of 20cm or more shall be maintained between the end user and each WWAN, WiMAX or WLAN, and Bluetooth transmitting antenna. Portable user conditions or additional collocated transmitters not allowed based on this RF exposure analysis require a Class II permissive change and updated RF exposure report.

2. RF Exposure Limits and Equations FCC RULES: According to FCC OET Bulletin 65 Supplement C, the criteria listed in Table 1 shall be used to evaluate the environmental impact of human exposure to radio frequency (RF) radiation as specified in §1.1307. Table 1 : Limits for Maximum Permissible Exposure (MPE) IC RULES: IC has adopted the RF field strength limits established in Health Canada’s RF exposure guideline. The limits are shown in Table 2 below per RSS- 102. Table 2 : RF Field Strength Limits for Devices Used by the General Public (Uncontrolled Environment)

EQUATIONS: Power density is given by : S = EIRP / (4 * Pi * D^2) where S = Power density (mW/cm^2) EIRP = Equivalent Isotropic Radiated Power (mW) D = Separation distance (cm)

3. Product Declarations The EM7355 wireless modem can be installed for use in any mobile host as long as the antenna gain of the host antenna does not exceed the gain listed in table 2. This MPE analysis is applicable to any collocated transmitters with transmit power: - less than or equal to 29.0dBm for WLAN/WiMAX; and - less than or equal to 15.0dBm for BT. Specific FCC IDs for those devices are not necessary or identified in this analysis providing they are classified as mobile transmitters. A 100% duty cycle is used for calculations to present a worse-case analysis when applicable. Maximum Max Conducted Max Antenna Gain (dBi) Equipment Transmitter Mode Transmitter Power Category Range (MHz) Duty Cycle (dBm) (W) Standalone Collocated 824-849 33.0 2.00 6.5 3.0 GPRS Class 10 25% 1850-1910 30.0 1.00 3.0 3.0 824-849 28.0 0.63 6.5 3.0 Class 10 25% 1850-1910 27.0 0.50 3.0 3.0 824-849 26.2 0.42 6.5 3.0 EDGE Class 11 37.50% 1850-1910 25.2 0.33 3.0 3.0 824-849 25.0 0.32 6.5 3.0 Class 12 50% 1850-1910 24.0 0.25 3.0 3.0 824-849 25.0 0.32 6.5 3.0 CDMA EvDo 100% 1850-1910 25.0 0.32 3.0 3.0 817 – 824 25.0 0.32 6.5 3.0 824 - 849 24.0 0.25 6.5 3.0 HSDPA UMTS 100% 1710-1755 24.0 0.25 6.0 6.0 HSUPA 1850 - 1910 24.0 0.25 3.0 3.0 704 - 716 24.0 0.25 9.0 6.0 Band 17 777 - 787 24.0 0.25 9.0 6.0 Band 13 824 - 849 24.0 0.25 6.5 3.0 Band 5 LTE 100% 1710 - 1755 24.0 0.25 6.0 6.0 Band 4 Band 2 1850 - 1910 24.0 0.25 3.0 3.0 Band 25 1850 - 1915 24.0 0.25 3.0 3.0 Table 2: EM7355 Standalone and Collocated Transmission Declarations

4. MPE Calculations The WWAN MPE calculations are based on conservative conducted transmit power exceeding those listed in the FCC ID N7NEM7355 and IC number 2417C-EM7355 filing. The higher transmit power levels are used to present a worst case assessment. The WiMAX, WLAN, and BT transmit power and antenna gain parameters represent a maximum transmit power for a given frequency band. Integration of either a WiMAX or WLAN, and BT module that exceeds the parameters requires a new FCC authorization or permissive change application. A maximum antenna gain of 5 dBi for WLAN/WiMAX/BT has been assumed for all collocated antennas. Table 3, 4, and 5 summarize transmitter parameters associated with this analysis.

4.1. Individual Transmitter Calculations 4.1.1. Maximum Output Power The maximum power calculations for EM7355 per wireless technology are shown in Table 3 Maximum Maximum Maximum Max Max Max Max Max Frequency Conducted Conducte Antenna Duty output Technology EIRP EIRP ERP ERP (MHz) Power d Power Gain Cycle power (dBm) (W) (dBm) (W) (dBm) (W) (dBi) limit GPRS 2 UL 824-849 33.0 2.00 6.5 0.250 39.500 8.913 37.360 5.445 7 W ERP EDGE 2 UL 824-849 28.0 0.63 6.5 0.250 34.500 2.818 32.360 1.722 7 W ERP EDGE 3 UL 824-849 26.2 0.42 6.5 0.375 32.700 1.862 30.560 1.138 7 W ERP EDGE 4UL 824-849 25.0 0.32 6.5 0.500 31.500 1.413 29.360 0.863 7 W ERP GPRS 2 UL 1850-1910 30.0 1.00 3.0 0.250 33.000 1.995 30.860 1.219 2 W EIRP EDGE 2 UL 1850-1910 27.0 0.50 3.0 0.250 30.000 1.000 27.860 0.611 2 W EIRP EDGE 3 UL 1850-1910 25.2 0.33 3.0 0.375 28.200 0.661 26.060 0.404 2 W EIRP EM7355 module EDGE 4UL 1850-1910 24.0 0.25 3.0 0.500 27.000 0.501 24.860 0.306 2 W EIRP (Standalone) CDMA BC0 824-849 25.0 0.32 6.5 1.000 31.500 1.413 29.360 0.863 7 W ERP CDMA BC1 1850-1910 25.0 0.32 3.0 1.000 28.000 0.631 25.860 0.385 2 W EIRP CDMA BC10 817-824 25.0 0.32 6.5 1.000 31.500 1.413 29.360 0.863 7 W ERP UMTS 824 - 849 24.0 0.25 6.5 1.000 30.500 1.122 28.360 0.685 7 W ERP UMTS 1710-1755 24.0 0.25 6.0 1.000 30.000 1.000 27.860 0.611 1 W EIRP UMTS 1850 - 1910 24.0 0.25 3.0 1.000 27.000 0.501 24.860 0.306 2 W EIRP LTE 704 - 716 24.0 0.25 9.0 1.000 33.000 1.995 30.860 1.219 3 W ERP LTE 777 - 787 24.0 0.25 9.0 1.000 33.000 1.995 30.860 1.219 3 W ERP LTE 824 - 849 24.0 0.25 6.5 1.000 30.500 1.122 28.360 0.685 7 W ERP LTE 1710 - 1755 24.0 0.25 6.0 1.000 30.000 1.000 27.860 0.611 1 W EIRP LTE 1850– 1910 24.0 0.25 3.0 1.000 27.000 0.501 24.860 0.306 2 W EIRP LTE 1850- 1915 24.0 0.25 3.0 1.000 27.000 0.501 24.860 0.306 2 W EIRP Table 3: EM7355 Maximum Output Power Calculation

4.1.2. Standalone Power Density The power density calculations for the individual transmitters per wireless technology at an exposure minimum separation distance of 20cm are shown in Table 4. For frequency dependent limit, the lowest transmitter frequency was used to represent the lowest MPE limit in this analysis (eg. 824MHz = 0.549mW/cm2) Maximum Maximum Power Maximum Average Average FCC MPE Frequency Conducted Antenna Duty Density @ Technology Conducted EIRP EIRP Limit (MHz) Power Gain Cycle 20cm Power (W) (dBm) (mW) (mW/cm^2) (dBm) (dBi) (mW/cm^2) GPRS 2 UL 824-849 33.0 2.00 6.5 0.250 33.48 2228.127 0.443 0.549 EDGE 2 UL 824-849 28.0 0.63 6.5 0.250 28.48 704.596 0.140 0.549 EDGE 3 UL 824-849 26.2 0.42 6.5 0.375 28.44 698.283 0.139 0.549 EDGE 4UL 824-849 25.0 0.32 6.5 0.500 28.49 706.269 0.141 0.549 GPRS 2 UL 1850-1910 30.0 1.00 3.0 0.250 26.98 498.816 0.099 1.000 EDGE 2 UL 1850-1910 27.0 0.50 3.0 0.250 23.98 250.000 0.050 1.000 EM7355 Module (Standalone) EDGE 3 UL 1850-1910 25.2 0.33 3.0 0.375 23.94 247.760 0.049 1.000 EDGE 4UL 1850-1910 24.0 0.25 3.0 0.500 23.99 250.594 0.050 1.000 CDMA BC0 824-849 25.0 0.3 6.5 1.000 31.50 1412.538 0.281 0.549 CDMA BC1 1850-1910 25.0 0.3 3.0 1.000 28.00 630.957 0.126 1.000 CDMA BC10 817-824 25.0 0.3 6.5 1.000 31.50 1412.538 0.281 0.544 UMTS 824 - 849 24.0 0.251 6.5 1.000 30.50 1122.018 0.223 0.549 UMTS 1710-1755 24.0 0.251 6.0 1.000 30.00 1000.000 0.199 1.000 UMTS 1850 - 1910 24.0 0.251 3.0 1.000 27.00 501.187 0.100 1.000 LTE 704 - 716 24.0 0.3 9.0 1.000 33.00 1995.262 0.397 0.469 LTE 777 - 787 24.0 0.3 9.0 1.000 33.00 1995.262 0.397 0.518 LTE 824 - 849 24.0 0.3 6.5 1.000 30.50 1122.018 0.223 0.549 LTE 1710 - 1755 24.0 0.3 6.0 1.000 30.00 1000.000 0.199 1.000 LTE 1850 - 1910 24.0 0.3 3.0 1.000 27.00 501.187 0.100 1.000 LTE 1850 - 1915 24.0 0.3 3.0 1.000 27.00 501.187 0.100 1.000 Table 4: EM7355 Standalone MPE Calculation

4.2. Collocated MPE Calculation The WiMAX, WLAN, and BT power levels listed represent the worse-case scenario for corresponding frequency ranges given. Maximum Maximum Power Maximum Average Average FCC MPE Frequency Conducted Antenna Duty Density @ Technology Conducted EIRP EIRP Limit (MHz) Power Gain Cycle 20cm Power (W) (dBm) (mW) (mW/cm^2) (dBm) (dBi) (mW/cm^2) GPRS 2 UL 824-849 33.0 2.00 3.0 0.250 29.98 995.268 0.198 0.549 EDGE 2 UL 824-849 28.0 0.63 3.0 0.250 24.98 314.731 0.063 0.549 EDGE 3 UL 824-849 26.2 0.42 3.0 0.375 24.94 311.911 0.062 0.549 EDGE 4UL 824-849 25.0 0.32 3.0 0.500 24.99 315.479 0.063 0.549 GPRS 2 UL 1850-1910 30.0 1.00 3.0 0.250 26.98 498.816 0.099 1.000 EDGE 2 UL 1850-1910 27.0 0.50 3.0 0.250 23.98 250.000 0.050 1.000 EM7355 Module (Collocated) EDGE 3 UL 1850-1910 25.2 0.33 3.0 0.375 23.94 247.760 0.049 1.000 EDGE 4UL 1850-1910 24.0 0.25 3.0 0.500 23.99 250.594 0.050 1.000 CDMA BC0 824-849 25.0 0.3 3.0 1.000 28.00 630.957 0.126 0.549 CDMA BC1 1850-1910 25.0 0.3 3.0 1.000 28.00 630.957 0.126 1.000 CDMA BC10 817-824 25.0 0.3 3.0 1.000 28.00 630.957 0.126 0.544 UMTS 824 - 849 24.0 0.251 3.0 1.000 27.00 501.187 0.100 0.549 UMTS 1710-1755 24.0 0.251 6.0 1.000 30.00 1000.000 0.199 1.000 UMTS 1850 - 1910 24.0 0.251 3.0 1.000 27.00 501.187 0.100 1.000 LTE 704 - 716 24.0 0.3 6.0 1.000 30.00 1000.000 0.199 0.469 LTE 777 - 787 24.0 0.3 6.0 1.000 30.00 1000.000 0.199 0.518 LTE 824 - 849 24.0 0.3 3.0 1.000 27.00 501.187 0.100 0.549 LTE 1710 - 1755 24.0 0.3 6.0 1.000 30.00 1000.000 0.199 1.000 LTE 1850 - 1910 24.0 0.3 3.0 1.000 27.00 501.187 0.100 1.000 LTE 1850 - 1915 24.0 0.3 3.0 1.000 27.00 501.187 0.100 1.000 WLAN 2400 - 2500 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 Other Collocated WLAN 5150 - 5850 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 Transmitters WiMax 2300 - 2400 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 WiMax 2500 - 2700 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 WiMax 3300 - 3800 29.0 0.794 5.0 1.000 34.00 2511.886 0.500 1.000 BT 2400 - 2500 15.0 0.032 5.0 1.000 20.00 100.000 0.020 1.000 Table 5: EM7355 Collocated MPE Calculation

Per OET Bulletin 65, when RF sources have difference frequencies, the fraction of the FCC power density limit shall be determined and the sum of all fractional components shall be less than 1. WLAN/WiMAX WLAN/WiMAX + WLAN/WiMAX Pd (mW/cm^2) BT Pd (mW/cm^2) Limit Band (GHz) BT Pd (mW/cm^2) 2.3 - 2.4 2.4 - 2.5 2.5 - 2.7 0.500 0.020 0.520 1.000 3.3 3.8 5.15 - 5.85 Table 6: (WLAN or WiMAX) + BT Collocated MPE Calculation (850 MHz (WLAN / WWAN WLAN / WiMAX + WLAN / WiMAX FCC MPE + 850 MHz FCC MPE (WWAN 850 WLAN / WiMAX + Limit BT Pd) WWAN Pd Limit MHz) / MPE Limit Pass/Fail WiMAX Band (GHz) BT Pd (mW/cm^2) / (mW/cm^2) (mW/cm^2) Limit) + (mW/cm^2) (MPE BT Limit) fraction) 2.3 - 2.4 2.4 - 2.5 2.5 - 2.7 0.520 1.000 0.520 0.198 0.549 0.360 0.880 1.000 Pass 3.3 - 3.8 5.15 - 5.85 Table 7: WWAN 850MHz + WLAN / WiMAX + BT Collocated MPE Calculation

(1900 (WLAN / MHz WLAN / WiMAX WWAN WLAN / WiMAX FCC MPE + 1900 MHz FCC MPE (WWAN 1900 + WiMAX + Limit BT Pd) WWAN Pd Limit MHz) / MPE WLAN / Limit Pass/Fail Band BT Pd (mW/cm^2) / (mW/cm^2) (mW/cm^2) Limit) WiMAX (GHz) (mW/cm^2) (MPE + Limit) BT fraction) 2.3 - 2.4 2.4 - 2.5 2.5 - 2.7 0.520 1.000 0.520 0.126 1.000 0.126 0.645 1.000 Pass 3.3 - 3.8 5.15 - 5.85 Table 8: WWAN 1900MHz + WLAN / WiMAX + BT Collocated MPE Calculation (700 (WLAN / MHz WLAN / WIMAX WWAN WLAN / (WWAN WiMAX FCC MPE + 700 MHz + WIMAX FCC MPE Limit 700 MHz) / + Limit BT Pd) WWAN Pd WLAN / Limit Pass/Fail Band (mW/cm^2) MPE BT Pd (mW/cm^2) / (mW/cm^2) WiMAX (GHz) Limit) (mW/cm^2) (MPE + Limit) BT fraction) 2.3 - 2.4 2.4 - 2.5 2.5 - 2.7 0.520 1.000 0.520 0.199 0.469 0.424 0.944 1.000 Pass 3.3 - 3.8 5.15 - 5.85 Table 9: WWAN 700MHz + WLAN / WiMAX + BT Collocated MPE Calculation

(1700 (WLAN / MHz WLAN / WIMAX WWAN WLAN / (WWAN WiMAX FCC MPE + 1700 MHz + WIMAX FCC MPE Limit 1700 MHz) + Limit BT Pd) WWAN Pd WLAN / Limit Pass/Fail Band (mW/cm^2) / MPE BT Pd (mW/cm^2) / (mW/cm^2) WiMAX (GHz) Limit) (mW/cm^2) (MPE + Limit) BT fraction) 2.3 - 2.4 2.4 - 2.5 2.5 - 2.7 0.520 1.000 0.520 0.199 1.000 0.199 0.719 1.000 Pass 3.3 - 3.8 5.15 - 5.85 Table 10: WWAN 1700MHz + WLAN / WiMAX + BT Collocated MPE Calculation

5. Conclusion Based on FCC OET Bulletin 65 Supplement C and 47 CFR §2.1091, the analysis concludes that the EM7355 wireless modem, when transmitting either in standalone or simultaneously with other co-located radio transmitters within a host device, is compliant with the FCC/IC RF exposure requirements in mobile exposure condition, provided the conducted power and antenna gain do not exceed the limits in Table 11 for each given frequency band per wireless technology. Maximum Maximum Antenna Gain Frequency Conducted (dBi) Device Technology (MHz) Power Standalone Collocated (dBm) 824 - 849 33.0 6.5 3.0 GPRS 1850 – 1910 30.0 3.0 3.0 824 – 849 28.0 6.5 3.0 EDGE 1850 - 1910 27.0 3.0 3.0 824-849 25.0 6.5 3.0 CDMA 1850 - 1910 25.0 3.0 3.0 817 – 824 25.0 6.5 3.0 EM7355 824 - 849 24.0 6.5 3.0 UMTS 1710 – 1755 24.0 6.0 6.0 1850 - 1910 24.0 3.0 3.0 704 - 716 24.0 9.0 6.0 777 – 787 24.0 9.0 6.0 824 – 849 24.0 6.5 3.0 LTE 1710 – 1755 24.0 6.0 6.0 1850 – 1910 24.0 3.0 3.0 1850 - 1915 24.0 3.0 3.0 WLAN 2400 - 2500 29.0 5.0 Transmitters WLAN 5150 - 5850 29.0 5.0 Collocated WiMAX 2300 - 2400 29 5.0 WiMAX 2500 - 2700 29 5.0 WiMAX 3300 - 3800 29 5.0 BT BT 2400 - 2500 15 5.0 Table 11: Summary of Maximum Conducted Power and Antenna Gain


Document Created: 2013-02-05 13:48:38
Document Modified: 2013-02-05 13:48:38
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