RF Exposure Report

FCC ID: LDK102054E

RF Exposure Info

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FCCID_645501

REPORT NO: 04U2603-1                                                             DATE: AUGUST 30, 2004
EUT: 802.11 a/b/g ACCESS POINT                                                     FCC ID: LDK102054

                                      SCOPE OF DOCUMENT

Compliance Certification Services hereby gives written permission for the following partial reproduction
and extract of the MPE sections from report number 04U2603-1.




MIKE HECKROTTE
ENGINEERING MANAGER
COMPLIANCE CERTIFICATION SERVICES




COMPLIANCE CERTIFICATION SERVICES                                 DOCUMENT NO: CCSUP4031A
561F MONTEREY ROAD, MORGAN HILL, CA 95037 USA                     TEL: (408) 463-0885 FAX: (408) 463-0888
This report shall not be reproduced except in full, without the written approval of CCS. This document may
be altered or revised by Compliance Certification Services personnel only, and shall be noted in the
revision section of the document.


REPORT NO: 04U2603-1                                                            DATE: AUGUST 30, 2004
EUT: 802.11 a/b/g ACCESS POINT                                                    FCC ID: LDK102054

6.4 MAXIMUM PERMISSIBLE EXPOSURE


LIMITS

§1.1310 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(b), except in the case of portable
devices which shall be evaluated according to the provisions of §2.1093 of this chapter.




COMPLIANCE CERTIFICATION SERVICES                                 DOCUMENT NO: CCSUP4031A
561F MONTEREY ROAD, MORGAN HILL, CA 95037 USA                     TEL: (408) 463-0885 FAX: (408) 463-0888
This report shall not be reproduced except in full, without the written approval of CCS. This document may
be altered or revised by Compliance Certification Services personnel only, and shall be noted in the
revision section of the document.


REPORT NO: 04U2603-1                                                             DATE: AUGUST 30, 2004
EUT: 802.11 a/b/g ACCESS POINT                                                     FCC ID: LDK102054


CALCULATIONS

Given
        E = √ (30 * P * G) / d
and
        S = E ^ 2 / 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 rearranging the terms to express the distance as a function of the remaining
variables yields:
        d = √ ((30 * P * G) / (3770 * S))

Changing to units of Power to mW and Distance to cm, using:
       P (mW) = P (W) / 1000 and
       d (cm) =100 * d (m)
yields
       d = 100 * √ ((30 * (P / 1000) * G) / (3770 * S))
       d = 0.282 * √ (P * G / S)
where
       d = distance in cm
       P = Power in mW
       G = Numeric antenna gain
       S = Power Density in mW/cm^2

Substituting the logarithmic form of power and gain using:
        P (mW) = 10 ^ (P (dBm) / 10) and
        G (numeric) = 10 ^ (G (dBi) / 10)
yields
        d = 0.282 * 10 ^ ((P + G) / 20) / √ S                     Equation (1)
where
        d = MPE distance in cm
        P = Power in dBm
        G = Antenna Gain in dBi
        S = Power Density Limit in mW/cm^2

Equation (1) and the measured peak power is used to calculate the MPE distance.




COMPLIANCE CERTIFICATION SERVICES                                DOCUMENT NO: CCSUP4031A
561F MONTEREY ROAD, MORGAN HILL, CA 95037 USA                    TEL: (408) 463-0885 FAX: (408) 463-0888
This report shall not be reproduced except in full, without the written approval of CCS. This document may
be altered or revised by Compliance Certification Services personnel only, and shall be noted in the
revision section of the document.


REPORT NO: 04U2603-1                                                            DATE: AUGUST 30, 2004
EUT: 802.11 a/b/g ACCESS POINT                                                    FCC ID: LDK102054


LIMITS

From §1.1310 Table 1 (B), S = 1.0 mW/cm^2


RESULTS

No non-compliance noted:

           Mode               Power Density         Output         Antenna          MPE
                                 Limit              Power           Gain           Distance
                               (mW/cm^2)            (dBm)           (dBi)            (cm)
          802.11b                 1.0                25.64           4.00            8.56
          802.11g                 1.0                24.82           4.00            7.78


NOTE: For mobile or fixed location transmitters, the minimum separation distance is 20 cm, even if
calculations indicate that the MPE distance would be less.




COMPLIANCE CERTIFICATION SERVICES                                DOCUMENT NO: CCSUP4031A
561F MONTEREY ROAD, MORGAN HILL, CA 95037 USA                    TEL: (408) 463-0885 FAX: (408) 463-0888
This report shall not be reproduced except in full, without the written approval of CCS. This document may
be altered or revised by Compliance Certification Services personnel only, and shall be noted in the
revision section of the document.


REPORT NO: 04U2603-1                                                            DATE: AUGUST 30, 2004
EUT: 802.11 a/b/g ACCESS POINT                                                    FCC ID: LDK102054

6.8 CO-LOCATED MAXIMUM PERMISSIBLE EXPOSURE


§1.1310 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(b), except in the case of portable
devices which shall be evaluated according to the provisions of §2.1093 of this chapter.




COMPLIANCE CERTIFICATION SERVICES                                 DOCUMENT NO: CCSUP4031A
561F MONTEREY ROAD, MORGAN HILL, CA 95037 USA                     TEL: (408) 463-0885 FAX: (408) 463-0888
This report shall not be reproduced except in full, without the written approval of CCS. This document may
be altered or revised by Compliance Certification Services personnel only, and shall be noted in the
revision section of the document.


REPORT NO: 04U2603-1                                                            DATE: AUGUST 30, 2004
EUT: 802.11 a/b/g ACCESS POINT                                                    FCC ID: LDK102054


CALCULATIONS

Given
         E = √ (30 * P * G) / d
and
         S = E ^ 2 / 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 rearranging the terms to express the distance as a function of the remaining
variables yields:
        d = √ ((30 * P * G) / (3770 * S))

Changing to units of Power to mW and Distance to cm, using:
       P (mW) = P (W) / 1000 and
       d (cm) =100 * d (m)
yields
       d = 100 * √ ((30 * (P / 1000) * G) / (3770 * S))
       d = 0.282 * √ (P * G / S)
where
       d = distance in cm
       P = Power in mW
       G = Numeric antenna gain
       S = Power Density in mW/cm^2

For multiple colocated transmitters operating simultaneously the total power density can be calculated by
summing the Power * Gain product of each transmitter.

yields
         d = 0.282 * √ ((P1 * G1) + (P2 * G2) + ... + (Pn * Pn)) / S)              Equation (1)
where
         d = distance in cm
         Px = Power of transmitter x in mW
         Gx = Numeric gain of antenna x
         S = Power Density in mW/cm^2




COMPLIANCE CERTIFICATION SERVICES                                  DOCUMENT NO: CCSUP4031A
561F MONTEREY ROAD, MORGAN HILL, CA 95037 USA                      TEL: (408) 463-0885 FAX: (408) 463-0888
This report shall not be reproduced except in full, without the written approval of CCS. This document may
be altered or revised by Compliance Certification Services personnel only, and shall be noted in the
revision section of the document.


REPORT NO: 04U2603-1                                                            DATE: AUGUST 30, 2004
EUT: 802.11 a/b/g ACCESS POINT                                                    FCC ID: LDK102054

In the table below, Power and Gain are entered in units of dBm and dBi respectively, then these are
converted to their linear forms prior to the summation function.

The conversions from the logarithmic form of power and gain are made using:
       P (mW) = 10 ^ (P (dBm) / 10) and               Equation (2)
       G (numeric) = 10 ^ (G (dBi) / 10)              Equation (3)

Equations (1), (2) and (3) and the measured peak powers are used to calculate the MPE distance.


LIMITS

From §1.1310 Table 1 (B), S = 1.0 mW/cm^2


RESULTS

No non-compliance noted:


           Mode               Power Density         Output         Antenna           MPE
                                 Limit              Power           Gain            Distance
                               (mW/cm^2)            (dBm)           (dBi)             (cm)
          802.11g                                    25.64           4.00
          802.11a                                    17.31           4.00
         Combined                    1.0                                              9.16


NOTE: For mobile or fixed location transmitters, the minimum separation distance is 20 cm, even if
calculations indicate that the MPE distance would be less.




COMPLIANCE CERTIFICATION SERVICES                                DOCUMENT NO: CCSUP4031A
561F MONTEREY ROAD, MORGAN HILL, CA 95037 USA                    TEL: (408) 463-0885 FAX: (408) 463-0888
This report shall not be reproduced except in full, without the written approval of CCS. This document may
be altered or revised by Compliance Certification Services personnel only, and shall be noted in the
revision section of the document.



Document Created: 2006-04-10 07:33:14
Document Modified: 2006-04-10 07:33:14

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