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American Telecommunications Certification Body Inc. 6731 Whittier Ave, McLean, VA 22101 December 28, 2003 RE: Digital Path Networks FCC ID: RHK-G1CPE150 I have a few comments on this Application. 1.) This device is a 31mW transmitter feeding an 8dBi antenna for a total EIRP about 200mW. I simply do not believe the peak radiated field strength of the fundamental would be as low as you show in your Test Report. Please review, re-measure, and comment. 2.) The Manual does not give clear warnings to either end users or installers about the necessity for maintaining a minimum of 20cm separation from all persons. My assumption is that, although professionally installed, instances of indoor installation may occur. This will then necessitate the 20cm warning. 3.) In addition to the installation instructions provided, please supply information to be given to the end user, if different than what is included with this filing. William H. Graff President and Examining Engineer mailto: [email protected] The items indicated above must be submitted before processing can continue on the above referenced application. Failure to provide the requested information may result in application termination. Correspondence should be considered part of the permanent submission and may be viewed from the Internet after a Grant of Equipment Authorization is issued. Please do not respond to this correspondence using the email reply button. In order for your response to be processed expeditiously, you must submit your documents through the AmericanTCB.com website. Also, please note that partial responses increase processing time and should not be submitted. Any questions about the content of this correspondence should be directed to the sender.

Page 1 CONSTRUCTION PHOTOS OF EUT Digital Path Networks G1CPE150 920819R02 Page 2 Page 3

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LABEL LOCATION FOR FCC ID The "box" unit with the directional antenna will have the label on the lower left corner of the back side, above where the ethernet cable plugs in.

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FCC ID: RHK-G1CPE150 Report No.RF920819R02 Operational Description The transmitter of the EUT is powered by POE (Power over Ethernet) and connected with managing computer through RJ45 port. The antennas used in this product is Directional Panel antenna with MCX antenna connector. Under normal use condition, the user has to keep at least 20cm separation distance between radiator and the body of the user. The other instruction, please have a look at the users manual. DSSS Information This device is Direct Sequence Spread Spectrum, the data is mixed by pseudorandom code which is an orthogonal code. The mixed data is digital modulated by BPSK and QPSK technique depends on the data rates. The CCK coding is applied for increasing the data rate, and also the processing gain will be increased. The bit rates are 1,2,5.5,11Mbps, the symbol rates are 1,1,1.375,1.375Mbps, the chip rates are always 11Mbps. So, the Chip/symbol is 11,11,8 and 8 respectively. Although is higher bit rate, the processing gain is lower than 10, but the CCK coding used in higher bit rate will provide 2.2dB coding gain.

FCC ID: RHK-G1CPE150 Report No: RF920819R02 1 RF EXPOSURE REPORT REPORT NO.: RF920819R02 MODEL NO.: G1CPE150 ACCORDING: FCC Guidelines for Human Exposure IEEE C95.1 APPLICANT: Digital Path Networks ADDRESS: 275 Airpark Boulevard, Suite 500 Chico, CA 95973, U.S.A. ISSUED BY: Advance Data Technology Corporation LAB LOCATION: 47 14th Lin, Chiapau Tsun, Linko, Taipei, Taiwan, R.O.C. FCC ID: RHK-G1CPE150 Report No: RF920819R02 2 RF Exposure Measurement (Mobile Device) 1. Introduction In this document, we try to prove the safety of radiation harmfulness to the human body for our product. The limit for Maximum Permissible Exposure (MPE) specified in FCC 1.1310 is followed. The Gain of the antenna used in this product is measured in a Fully Anechoic Chamber (FAC) calibrated for antenna measurement in ADT, and also the maximum total power input to the antenna is measured. Through the Friis transmission formula and the maximum gain of the antenna, we can calculate the distance, away from the product, where the limit of MPE is reached. Although the Friis transmission formula is a far field assumption, the calculated result of that is an over-prediction for near field power density. We will take that as the worst case to specify the safety range. 2. RF Exposure Limit According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environmental impact of human exposure to radio-frequency (RF) radiation as specified in 1.1307(b) LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) Frequency Range (MHz) Electric Field Strength (V/m) Magnetic Field Strength (A/m) Power Density (mW/cm 2 ) Average Time (minutes) (A)Limits For Occupational / Control Exposures 300-1500......F/3006 1500-100,000......56 (B)Limits For General Population / Uncontrolled Exposure 300-1500......F/15006 1500-100,000......1.030 F = Frequency in MHz FCC ID: RHK-G1CPE150 Report No: RF920819R02 3 3. Friis Formula Friis transmission formula : Pd = (Pout*G) / (4*pi*r 2 ) where Pd = power density in mW/cm 2 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 If we know the maximum Gain of the antenna and the total power input to the antenna, through the calculation, we will know the MPE value at distance r. Ref. : David K. Cheng, Field and Wave Electromagnetics, Second Edition, Page 640, Eq. (11-133). 4 EUT Operating condition The software provided by Manufacturer enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. 5. Classification The antenna of this product, under normal use condition, is at least 20cm away from the body of the user. Warning statement to the user for keeping at least 20cm or more separation distance with the antenna should be included in users manual. So, this device is classified as Mobile Device. FCC ID: RHK-G1CPE150 Report No: RF920819R02 4 6 Test Results 6.1 Antenna Gain The maximum Gain measured in Fully Anechoic Chamber is 8dBi or 6.31 (numeric). 6.2 Output Power Into Antenna & RF Exposure value at distance 20cm: Channel Channel Frequency (MHz) Output Power to Antenna (mW) Power Density (mW/cm 2 ) Limit of Power Density (mW/cm 2 ) 1241233.340.0421.0 6243734.040.0431.0 11246232.960.0411.0

FCC ID: RHK-G1CPE150 Report No.: RF920819R021Issued: December 19, 2003 FCC TEST REPORT REPORT NO.: RF920819R02 MODEL NO.: G1CPE150 RECEIVED: Aug. 28, 2003 TESTED: Sept. 5 ~ Sept. 10, 2003 APPLICANT: Digital Path Networks ADDRESS: 275 Airpark Boulevard, Suite 500, Chico, CA 95973, U.S.A. ISSUED BY: Advance Data Technology Corporation LAB LOCATION: 47 14th Lin, Chiapau Tsun, Linko, Taipei, Taiwan, R.O.C. This test report consists of 50 pages in total. It may be duplicated completely for legal use with the approval of the applicant. It should not be reproduced except in full, without the written approval of our laboratory. The client should not use it to claim product endorsement by CNLA, NVLAP or any government agencies. The test results in the report only apply to the tested sample. 0528 ILAC MRA Lab Code: 200102-0 FCC ID: RHK-G1CPE150 Report No.: RF920819R022Issued: December 19, 2003 Table of Contents 1CERTIFICATION ...........................................................................................4 2SUMMARY OF TEST RESULTS...................................................................5 3GENERAL INFORMATION ...........................................................................6 3.1 GENERAL DESCRIPTION OF EUT..............................................................6 3.2 DESCRIPTION OF TEST MODES................................................................7 3.3 GENERAL DESCRIPTION OF APPLIED STANDARDS ...............................7 3.4 DESCRIPTION OF SUPPORT UNITS ..........................................................8 3.5CONFIGURATION OF SYSTEM UNDER TEST...........................................9 4TEST TYPES AND RESULTS.....................................................................10 4.1 CONDUCTED EMISSION MEASUREMENT ..............................................10 4.1.1LIMITS OF CONDUCTED EMISSION MEASUREMENT............................10 4.1.2TEST INSTRUMENTS ................................................................................10 4.1.3TEST PROCEDURES................................................................................. 11 4.1.4DEVIATION FROM TEST STANDARD ....................................................... 11 4.1.5TEST SETUP ..............................................................................................12 4.1.6EUT OPERATING CONDITIONS................................................................12 4.1.7TEST RESULTS..........................................................................................13 4.2 RADIATED EMISSION MEASUREMENT ...................................................19 4.2.1 LIMITS OF RADIATED EMISSION MEASUREMENT.................................19 4.2.2TEST INSTRUMENTS ................................................................................20 4.2.3TEST PROCEDURES.................................................................................21 4.2.4DEVIATION FROM TEST STANDARD .......................................................21 4.2.5TEST SETUP ..............................................................................................22 4.2.6EUT OPERATING CONDITIONS................................................................22 4.2.7TEST RESULTS..........................................................................................23 4.3 6dB BANDWIDTH MEASUREMENT ..........................................................28 4.3.1 LIMITS OF 6dB BANDWIDTH MEASUREMENT........................................28 4.3.2TEST INSTRUMENTS ................................................................................28 4.3.3TEST PROCEDURE ...................................................................................28 4.3.4DEVIATION FROM TEST STANDARD .......................................................28 4.3.5TEST SETUP ..............................................................................................29 FCC ID: RHK-G1CPE150 Report No.: RF920819R023Issued: December 19, 2003 4.3.6EUT OPERATING CONDITIONS................................................................29 4.3.7TEST RESULTS..........................................................................................30 4.4MAXIMUM PEAK OUTPUT POWER ..........................................................34 4.4.1LIMITS OF MAXIMUM PEAK OUTPUT POWER MEASUREMENT ...........34 4.4.2TEST INSTRUMENTS ................................................................................34 4.4.3TEST PROCEDURES.................................................................................35 4.4.4DEVIATION FROM TEST STANDARD .......................................................35 4.4.5TEST SETUP ..............................................................................................35 4.4.6EUT OPERATING CONDITIONS................................................................35 4.4.7TEST RESULTS..........................................................................................36 4.5 POWER SPECTRAL DENSITY MEASUREMENT......................................37 4.5.1LIMITS OF POWER SPECTRAL DENSITY MEASUREMENT ...................37 4.5.2TEST INSTRUMENTS ................................................................................37 4.5.3TEST PROCEDURE ...................................................................................38 4.5.4DEVIATION FROM TEST STANDARD .......................................................38 4.5.5TEST SETUP ..............................................................................................38 4.5.6EUT OPERATING CONDITIONS................................................................38 4.5.7TEST RESULTS..........................................................................................39 4.6BAND EDGES MEASUREMENT ................................................................43 4.6.1LIMITS OF BAND EDGES MEASUREMENT .............................................43 4.6.2TEST INSTRUMENTS ...........................................................…

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FCC ID: RHK-G1CPE150 Report No.: RF920819R0248Issued: December 19, 2003 5 PHOTOGRAPHS OF THE TEST CONFIGURATION CONDUCTED EMISSION TEST FCC ID: RHK-G1CPE150 Report No.: RF920819R0249Issued: December 19, 2003 RADIATED EMISSION TEST