RF Exposure Report

FCC ID: LDK-IR510OFDM

RF Exposure Info

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FCCID_3781090

EDCS – 12437518

Attestation Statement of Compliance

The IR510-OFDM-FCC/K9 radio has been evaluated for Maximum Permissible Exposure in compliance with
47 Code of Federal Regulations 2.1091. The evaluation was in accordance with methodology as referenced
in FCC Bulletin OET 65C (rev 01-01) along with KDB 447498 D01 General RF Exposure Guidance. This
report serves as the additional technical analysis of the Cisco radio modules

This study addresses the addition of an additional pair of transmitters using the data derived in the afore
mentioned report #

Coronado FCC-IC 802.15.4 Report IR510, EDCS#12437517

The limits used for this evaluation are in line with the recommendations of the World Health Organizations
(WHO) International Committee on Non Ionizing Radiation Protection (ICNIRP) as well as the American
National Standards Institute (ANSI) C95.1.

The limits chosen are of General Population/Uncontrolled Exposure.

This device must be installed to provide a separation distance of at least 35 cm from all persons. Installers
must be provided with antenna installation and transmitter operating conditions for satisfying RF exposure
compliance.

Based on the study this case scenario, the General Population/Uncontrolled Exposure and the minimum
recommended distance is around 35cm (14 inches) from the antenna.

Jose Aguirre
Cisco Systems Inc
Corporate Compliance and Certifications
125 West Tasman Drive
San Jose, CA 95134
Email: joaguirr@cisco.com

EDCS – 12437518

1.0 EUT Description

EUT description here.

Test Mode Modulation Rate Spacing Mode
Type
A 2FSK 50kbps 200kHz 64
B 2FSK 150kbps 400kHz 66
C 2FSK 150kbps 400kHz 98
D OFDM 50kbps 800kHz 144
E OFDM 200kbps 800kHz 146
F OFDM 400kbps 800kHz 147
G OFDM 800kbps 800kHz 149
H OFDM 1200kbps 800kHz 150
I OQPSK 6.25kbps 200kHz 192
Note1: Table above represents the worst case scenarios for all modulation and
data packet type combinations.

The following antennas are supported by this product series.
The data included in this report represent the worst case data for all antennas.

Frequency Part number Antenna Type Antenna Gain (dBi)

902-928MHz External Omni-directional 5.6

EDCS – 12437518

2.0 Methodology

All calculations were made in accordance with ANSI C95.1, and FCC OET 65C.

Measurement Uncertainty Values
Parameter Max MU from Declared MU
standard

Occupied Channel Bandwidth +/- 5% +/-2%

RF Output Power, conducted +/- 1,5dB +/-1.4dB

Power Spectral Density, conducted +/- 3dB +/- 2dB

Unwanted emissions, conducted +/- 3dB +/- 2dB

All emissions, radiated +/- 6dB +/- 3.2dB

Temperature +/- 3C +/- 0.7C

Supply Voltages +/- 3% +/- 2.5%

Time +/- 5% +/-2%

EDCS – 12437518

3.0 Technical Requirements

3.1 Single Band Operation – Limits

FCC Limits for Maximum Permissible Exposure (MPE)
(A) Limits for Occupational/Controlled Exposure

Frequency Electric Field Magnetic Field Power Density Averaging Time
Range Strength (E) Strength (H) (S) |E|2, |H|2 or S
(MHz) (V/m) (A/m) (mW/cm2) (minutes)

0.3-3.0 614 1.63 (100)* 6
3.0-30 1842/f 4.89/f (900/f2)* 6
30-300 61.4 0.163 1.0 6
300-1500 -- -- f/300 6
1500-100,000 -- -- 5 6

(B) Limits for General Population/Uncontrolled Exposure

Frequency Electric Field Magnetic Field Power Density Averaging Time
Range Strength (E) Strength (H) (S) |E|2, |H|2 or S
(MHz) (V/m) (A/m) (mW/cm2) (minutes)

0.3-1.34 614 1.63 (100)* 30
1.34-30 824/f 2.19/f (180/f2)* 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

NOTE 1: See Section 1 for discussion of exposure categories.

NOTE 2: The averaging time for General Population/Uncontrolled exposure to fixed transmitters is not
applicable for mobile and portable transmitters. See 47 CFR §§2.1091 and 2.1093 on source-
based time-averaging requirements for mobile and portable transmitters.

EDCS – 12437518

4.0 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 mW/cm^2

Combine equations and rearrange the terms to express the distance as a function of the remaining
variables:
d=√((30*P*G)/(3770*S))

Changing to units of power in mW and distance in cm, using:
P(mW)=P(W)/1000 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) G(numeric)=10^(G(dBi)/10)
yields
d=0.282*10^((P+G)/20)/√S Equation (1)
and
s=((0.282*10^((P+G)/20))/d)^2 Equation (2)
where
d=MPE distance in cm
P=Power in dBm
G=Antenna Gain in dBi
S=Power Density in mW/cm^2

EDCS – 12437518

5.0 Results

Equation (1) and the measured peak power are used to calculate the MPE distance. Note that for
mobile or fixed location transmitters such as an access point, the minimum separation distance is 20
cm even if the calculations indicate that the MPE distance may be less.

S=1mW/cm^2 maximum. Using the peak power levels recorded in the test report along with Equation
1 above, the MPE distances are calculated as follows.

MPE Calculations:
Radiated
Power Transmit Antenna MPE
Frequency Modulation Density Power Gain Distance Limit Margin
(MHz) type mW/cm2 (dBm) (dBi) (cm) (cm) (cm)
OQPSK 0.6 29.6 5.6 20.95 35 14.05
902-928 2FSK 0.6 29.7 5.6 21.19 35 13.81
OFDM 0.6 28.1 5.6 17.63 35 17.37
*Correlated Gain

To maintain compliance, installations will assure a separation distance of at least 35 cm.

Using Equation 2, the MPE levels (s) at 35 cm are calculated as follows:

Radiated
MPE Transmit Antenna Power
Frequency Modulation Distance Power Gain Density Limit Margin
(MHz) type (cm) (dBm) (dBi) (mW/cm2) (mW/cm2) (mW/cm2)
OQPSK 35 29.6 5.6 0.215 0.6 0.385
902-928 2FSK 35 29.7 5.6 0.220 0.6 0.380
OFDM 35 28.1 5.6 0.152 0.6 0.448
* Correlated Gain

EDCS – 12437518

References

American National Standards Institute (ANSI), "Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3
kHz to 300 GHz," ANSI/IEEE C95.1-1992 (previously issued as IEEE C95.1-1991). Copyright 1992 by the Institute of Electrical and Electronics
Engineers, Inc. (IEEE), New York, N.Y. 10017. For copies contact the IEEE: 1-800-678-4333 or 1-908-981-1393.
American National Standards Institute (ANSI), "Recommended Practice for the Measurement of Potentially Hazardous Electromagnetic Fields -
RF and Microwave”. ANSI/IEEE C95.3-1992. Copyright 1992, The Institute of Electrical and Electronics Engineers, Inc. (IEEE), New York, NY
10017. For copies contact the IEEE: 1-800-678-4333 or 1-908-981-1393.

FCC OET 65C Evaluating Compliance with FCC Guidelines for Human Exposure to RF Fields from 9KHz to 40 Ghz

Document Created: 2018-03-13 11:06:55
Document Modified: 2018-03-13 11:06:55

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