RF exposure

FCC ID: LDK-RMN302

RF Exposure Info

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FCCID_1379049

Compliance Certification Services Inc. Report No.: T100929216-RP FCC ID: LDK-RMN302 Date of Issue: October 21, 2010 APPENDIX I RADIO FREQUENCY EXPOSURE LIMIT According to §15.247(i), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy levels in excess of the Commission's guidelines. See § 1.1307(b)(1) of this chapter. EUT Specification EUT Wireless-N Boardband Home Router WLAN: 2.412GHz ~ 2.462GHz Frequency band WLAN: 5.18GHz ~ 5.32GHz / 5.50GHz ~ 5.70GHz (Operating) WLAN: 5.745GHz ~ 5.825GHz Others Portable (<20cm separation) Device category Mobile (>20cm separation) Others Occupational/Controlled exposure (S = 5mW/cm2) Exposure classification General Population/Uncontrolled exposure (S=1mW/cm2) Single antenna Multiple antennas Antenna diversity Tx diversity Rx diversity Tx/Rx diversity IEEE 802.11b mode: 16.54 dBm (45.08 mW) IEEE 802.11g mode: 24.01 dBm (251.77 mW) Max. output power IEEE 802.11n HT 20 MHz mode: 26.67 dBm (464.52 mW) IEEE 802.11n HT 40 MHz mode: 26.48 dBm (444.63 mW) 2.64 dBi (Numeric gain: 1.84) Antenna gain (Max) Antenna Calculation for MIMO Mode: 2.64dBi + 10 log (2) = 5.65 dBi (Numeric gain: 3.67) MPE Evaluation* Evaluation applied SAR Evaluation N/A Remark: 1. The maximum output power is 26.67dBm (464.52mW) at 2437MHz (with 3.67numeric antenna gain.) 2. DTS device is not subject to routine RF evaluation; MPE estimate is used to justify the compliance. 3. For mobile or fixed location transmitters, no SAR consideration applied. The maximum power density is 1.0 mW/cm2 even if the calculation indicates that the power density would be larger. TEST RESULTS No non-compliance noted. MPE EVALUATION No non-compliance noted. Page 96 Rev. 00

Compliance Certification Services Inc. Report No.: T100929216-RP FCC ID: LDK-RMN302 Date of Issue: October 21, 2010 Calculation 30 × P × G E2 Given E= & S= d 3770 Where E = Field strength in Volts / meter P = Power in Watts G = Numeric antenna gain d = Distance in meters S = Power density in milliwatts / square centimeter Combining equations and re-arranging the terms to express the distance as a function of the remaining variables yields: 30 × P × G S= 3770d 2 Changing to units of mW and cm, using: P (mW) = P (W) / 1000 and d (cm) = d(m) / 100 Yields 30 × (P / 1000) × G P×G S= = 0.0796 × 2 Equation 1 3770 × (d / 100) 2 d Where d = Distance in cm P = Power in mW G = Numeric antenna gain S = Power density in mW / cm2 Maximum Permissible Exposure Substituting the MPE safe distance using d = 20 cm into Equation 1: Yields S = 0.000199 × P × G Where P = Power in mW G = Numeric antenna gain S = Power density in mW / cm2 Page 97 Rev. 00

Compliance Certification Services Inc. Report No.: T100929216-RP FCC ID: LDK-RMN302 Date of Issue: October 21, 2010 IEEE 802.11b mode: EUT output power = 45.08 mW Numeric Antenna gain = 1.84 Æ Power density = 0.0165 mW / cm2 IEEE 802.11g mode: EUT output power = 251.77 mW Numeric Antenna gain = 1.84 Æ Power density = 0.09219 mW / cm2 IEEE 802.11n HT 20 MHz mode: EUT output power = 464.52 mW Numeric Antenna gain = 3.67 Æ Power density = 0.33933 mW / cm2 IEEE 802.11n HT 40 MHz mode: EUT output power = 444.63 mW Numeric Antenna gain = 3.67 Æ Power density = 0.32473 mW / cm2 (For mobile or fixed location transmitters, the maximum power density is 1.0 mW/cm2 even if the calculation indicates that the power density would be larger.) Page 98 Rev. 00


Document Created: 2010-11-05 10:12:09
Document Modified: 2010-11-05 10:12:09
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