RF Exposure

FCC ID: LDKSLTSP1905

RF Exposure Info

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FCCID_4311139

Cisco Systems Inc.                                                 FCC ID: LDKSLTSP1905, IC: 2461N-SLTSP1905


4     FCC §2.1091, §15.407(f) & ISEDC RSS-102 & LP0002– RF Exposure

4.1    Applicable Standards
According to FCC §15.407(f), §1.1307(b)(1) and LP0002 5.20.2.2, 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
level in excess of the Commission’s guidelines.
                              Limits for General Population/Uncontrolled Exposure

         Frequency          Electric Field        Magnetic Field
                                                                      Power Density        Averaging Time
           Range              Strength              Strength
                                                                        (mW/cm2)             (minutes)
           (MHz)                (V/m)                (A/m)
                                Limits for General Population/Uncontrolled Exposure
          0.3-1.34               614                   1.63               * (100)                 30
                                                                                  2
           1.34-30              824/f                 2.19/f             * (180/f )               30
           30-300                27.5                 0.073                 0.2                   30
          300-1500                /                     /                 f/1500                  30
        1500-100,000              /                     /                   1.0                   30

        f = frequency in MHz
        * = Plane-wave equivalent power density

According to ISED RSS-102 Issue 5:




Report Number: R1903188-407                  Page 12 of 46     FCC Part 15.407/ISEDC RSS-247/LP0002 Test Report


Cisco Systems Inc.                                                       FCC ID: LDKSLTSP1905, IC: 2461N-SLTSP1905



4.2    MPE Prediction
Predication of MPE limit at a given distance, Equation from OET Bulletin 65, Edition 97-01

                                                      S = PG/4R²
Where: S = power density
       P = power input to antenna
       G = power gain of the antenna in the direction of interest relative to an isotropic radiator
       R = distance to the center of radiation of the antenna


4.3    MPE Results for FCC
2.4 GHz Wi-Fi

                             Maximum output power at antenna input terminal (dBm):             23.8
                              Maximum output power at antenna input terminal (mW):             239.88
                                                              Prediction distance (cm):        30
                                                         Prediction frequency (MHz):           2437
                                              Maximum Antenna Gain, typical (dBi):             12
                                                  Maximum Antenna Gain (numeric):              15.85
                         Power density of prediction frequency at 30.0 cm (mW/cm2):            0.336
           FCC MPE limit for uncontrolled exposure at prediction frequency (mW/cm2):           1.0



The device is compliant with the requirement MPE limit for uncontrolled exposure. The maximum power
density at the distance of 30 cm is 0.336 mW/cm2. Limit is 1.0 mW/cm2.


2.4 GHz BLE

                       Maximum peak output power at antenna input terminal (dBm):              4.47
                       Maximum peak output power at antenna input terminal (mW):               2.80
                                                              Prediction distance (cm):        30
                                                         Prediction frequency (MHz):           2426
                                              Maximum Antenna Gain, typical (dBi):             6.0
                                                  Maximum Antenna Gain (numeric):              3.98
                         Power density of prediction frequency at 30.0 cm (mW/cm2):            0.00099
           FCC MPE limit for uncontrolled exposure at prediction frequency (mW/cm2):           1.0



The device is compliant with the requirement MPE limit for uncontrolled exposure. The maximum power
density at the distance of 30 cm is 0.00099 mW/cm2. Limit is 1.0 mW/cm2.




Report Number: R1903188-407                       Page 13 of 46       FCC Part 15.407/ISEDC RSS-247/LP0002 Test Report


Cisco Systems Inc.                                                  FCC ID: LDKSLTSP1905, IC: 2461N-SLTSP1905


5 GHz Wi-Fi

                      Maximum peak output power at antenna input terminal (dBm):          23.29
                      Maximum peak output power at antenna input terminal (mW):           213.30
                                                             Prediction distance (cm):    30
                                                        Prediction frequency (MHz):       5785
                                             Maximum Antenna Gain, typical (dBi):         12
                                                 Maximum Antenna Gain (numeric):          15.85
                        Power density of prediction frequency at 30.0 cm (mW/cm2):        0.29907
          FCC MPE limit for uncontrolled exposure at prediction frequency (mW/cm2):       1.0



The device is compliant with the requirement MPE limit for uncontrolled exposure. The maximum power
density at the distance of 30 cm is 0.29907 mW/cm2. Limit is 1.0 mW/cm2.


Worst case colocation 2.4 GHz Wi-Fi, BLE and 5 GHz Wi-Fi.

                                                                                 Worst-
                        Max          Evaluated      Worst-          MPE                       Sum of
      Frequency                                                                  Case
                      Conducted       Distance     Case MPE         Limit                      MPE      Limit
        Band                                                                     MPE
                     Power(dBm)         (cm)       (mW/cm2)       (mW/cm2)                    Ratios
                                                                                 Ratios
                                                     Worst Case

        2.4 GHz
                         23.1            30         0.28627          1.0         33.6 %
         Wi-Fi

        2.4 GHz
                         4.47            30         0.00099          1.0         0.099 %     63.606 %   100%
          BLE

         5 GHz
                        23.29            30         0.29907          1.0        29.907 %
         Wi-Fi




Report Number: R1903188-407                   Page 14 of 46      FCC Part 15.407/ISEDC RSS-247/LP0002 Test Report


Cisco Systems Inc.                                                  FCC ID: LDKSLTSP1905, IC: 2461N-SLTSP1905


4.4   RF exposure evaluation for ISEDC
2.4 GHz Wi-Fi

                            Maximum output power at antenna input terminal (dBm):        23.8
                               Maximum output power at antenna input terminal (W):       0.2399
                                                             Prediction distance (m):    0.3
                                                        Prediction frequency (MHz):      2437
                                              Maximum Antenna Gain, typical (dBi):       12
                                                 Maximum Antenna Gain (numeric):         15.85
                           Power density of prediction frequency at 30.0 cm (W/m2):      3.362
           ISEDC MPE limit for uncontrolled exposure at prediction frequency (W/m2):     5.404



The device is compliant with the requirement MPE limit for uncontrolled exposure. The maximum power
density at the distance of 0.3 m is 3.362 W/m2. Limit is 5.404 W/m2.


2.4 GHz BLE

                      Maximum peak output power at antenna input terminal (dBm):         4.47
                        Maximum peak output power at antenna input terminal (W):         0.0028
                                                              Prediction distance (m):   0.3
                                                        Prediction frequency (MHz):      2426
                                              Maximum Antenna Gain, typical (dBi):       6.0
                                                 Maximum Antenna Gain (numeric):         3.98
                          Power density of prediction frequency at 30.0 cm (W/cm2):      0.0099
            FCC MPE limit for uncontrolled exposure at prediction frequency (W/cm2):     5.387



The device is compliant with the requirement MPE limit for uncontrolled exposure. The maximum power
density at the distance of 0.3 m is 0.0099 W/m2. Limit is 5.387 W/m2.


5 GHz Wi-Fi

                      Maximum peak output power at antenna input terminal (dBm):         23.3
                        Maximum peak output power at antenna input terminal (W):         0.21380
                                                             Prediction distance (m):    0.3
                                                        Prediction frequency (MHz):      5785
                                              Maximum Antenna Gain, typical (dBi):       12
                                                 Maximum Antenna Gain (numeric):         15.85
                           Power density of prediction frequency at 30.0 cm (W/m2):      2.99756
             FCC MPE limit for uncontrolled exposure at prediction frequency (W/m2):     9.756



The device is compliant with the requirement MPE limit for uncontrolled exposure. The maximum power
density at the distance of 0.3 m is 2.99756 W/m2. Limit is 9.756 W/m2.




Report Number: R1903188-407                   Page 15 of 46      FCC Part 15.407/ISEDC RSS-247/LP0002 Test Report



Document Created: 2019-06-08 10:20:37
Document Modified: 2019-06-08 10:20:37

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