MPE

FCC ID: SLE-AWK-3121

RF Exposure Info

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FCCID_950960

Report No. 084316R-RFUSP05V01 RF Exposure Evaluation declaration Product Name : Industrial IEEE 802.11a/b/g wireless Access Point/Bridge/Client Model No. : AWK-3121-US, AWK-3121-US-T FCC ID : SLE-AWK-3121 Applicant : Moxa Technologies Co., Ltd Address : Fl.4, No. 135, Lane 235, Pao-Chiao Rd., Shing Tien City, Taipei, Taiwan, R.O.C. Date of Receipt : Apr. 18, 2008 Date of Declaration : May. 19, 2008 Report No. : 084316R-RFUSP05V01 The declaration results relate only to the samples calculated. The declaration shall not be reproduced except in full without the written approval of QuieTek Corporation. This report must not be used to claim product endorsement by NVLAP any agency of the U.S. Government Page: 1 of 4 Version: 1.0

Report No. 084316R-RFUSP05V01 1. RF Exposure Evaluation 1.1. Limits According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) radiation as specified in 1.1307(b) LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) Frequency Range Electric Field Magnetic Field Power Density Average Time 2 (MHz) Strength (V/m) Strength (A/m) (mW/cm ) (Minutes) (A) Limits for Occupational/ Control Exposures 300-1500 -- -- F/300 6 1500-100,000 -- -- 5 6 (B) Limits for General Population/ Uncontrolled Exposures 300-1500 -- -- F/1500 6 1500-100,000 -- -- 1 30 F= Frequency in MHz Friis Formula Friis transmission formula: Pd = (Pout*G)/(4*pi*r2) Where Pd = power density in mW/cm2 Pout = output power to antenna in mW G = gain of antenna in linear scale Pi = 3.1416 R = distance between observation point and center of the radiator in cm Pd id the limit of MPE, 1 mW/cm2 . If we know the maximum gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance r where the MPE limit is reached. 1.2. Test Procedure Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. The temperature and related humidity: 18℃and 78％ RH. Page: 2 of 4 Version: 1.0

Report No. 084316R-RFUSP05V01 1.3. Test Result of RF Exposure Evaluation Product : Industrial IEEE 802.11a/b/g wireless Access Point/Bridge/Client Test Item : RF Exposure Evaluation Test Site : CTR1 Antenna Gain Antenna Gain: The maximum Gain measured in fully anechoic chamber is 2.0dBi in logarithm scale. 802.11b (2412~2462MHz) Output Power Into Antenna & RF Exposure Evaluation Distance (2.0dBi): Output Power to Antenna Power Density at R = 20 cm Channel Frequency (MHz) (mW) (mW/cm2) 1 2412.00 54.8277 0.017287 6 2437.00 98.4011 0.031026 11 2462.00 39.8107 0.012553 The distance r (4th column) calculated from the Fries transmission formula is far shorter than 20 cm separation requirement. 802.11g (2412~2462MHz) Output Power Into Antenna & RF Exposure Evaluation Distance (2.0dBi): Output Power to Antenna Power Density at R = 20 cm Channel Frequency (MHz) (mW) (mW/cm2) 1 2412.00 42.3643 0.013358 6 2437.00 199.5262 0.062912 11 2462.00 36.4754 0.011501 The distance r (4th column) calculated from the Fries transmission formula is far shorter than 20 cm separation requirement. Page: 3 of 4 Version: 1.0

Report No. 084316R-RFUSP05V01 802.11a (5180~5240MHz) Output Power Into Antenna & RF Exposure Evaluation Distance (2.0dBi): Output Power to Antenna Power Density at R = 20 cm Channel Frequency (MHz) (mW) (mW/cm2) 1 5180.00 17.4582 0.005505 3 5220.00 28.4446 0.008969 4 5240.00 16.3682 0.005161 The distance r (4th column) calculated from the Fries transmission formula is far shorter than 20 cm separation requirement. 802.11a (5745~5825MHz) Output Power Into Antenna & RF Exposure Evaluation Distance (2.0dBi): Output Power to Antenna Power Density at R = 20 cm Channel Frequency (MHz) (mW) (mW/cm2) 5 5745.00 183.2314 0.057774 7 5785.00 194.5360 0.061338 8 5825.00 210.3778 0.066333 The distance r (4th column) calculated from the Fries transmission formula is far shorter than 20 cm separation requirement. Page: 4 of 4 Version: 1.0


Document Created: 2008-05-29 09:38:56
Document Modified: 2008-05-29 09:38:56
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