Attachment Exhibit A

This document pretains to SES-STA-20111024-01257 for Special Temporal Authority on a Satellite Earth Station filing.

IBFS_SESSTA2011102401257_922450

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for Global Crossing Americas Solutions, Inc Arecibo, Puerto Rico Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, Virginia 20147 October 13, 2011

TABLE OF CONTENTS 1. CONCLUSIONS.............................................................................................................................................3 2. SUMMARY OF RESULTS.............................................................................................................................4 3. SUPPLEMENTAL SHOWING .......................................................................................................................5 4. EARTH STATION COORDINATION DATA ..................................................................................................6 5. CERTIFICATION .........................................................................................................................................10 Frequency Coordination and Interference Analysis Report 10/13/2011 Page 2 of 10

1. CONCLUSIONS An interference study considering all existing, proposed and prior coordinated microwave facilities within the coordination contours of the proposed earth station demonstrates that this site will operate satisfactorily with the common carrier microwave environment, based upon the restrictions noted in the Summary of Results (Section 2). Frequency Coordination and Interference Analysis Report 10/13/2011 Page 3 of 10

2. SUMMARY OF RESULTS A number of great circle interference cases were identified during the interference study of the proposed earth station. Each of the cases, which exceeded the interference objective on a line-of-sight basis, was profiled and the propagation losses estimated using NBS TN101 (Revised) techniques. The losses were found to be sufficient to reduce the signal levels to acceptable magnitudes in most cases. The following companies reported potential great circle interference conflicts that did not meet the objectives on a line-of-sight basis. When over-the-horizon losses and frequency separation are considered on the interfering paths, sufficient losses exist to negate harmful interference from occurring with the proposed transmit-receive earth station. Further, the transmit spectrum will be limited to frequencies 6094.0 to 6124.0 MHz, and 6382.0 to 6423.0 MHz. Company AT&T Mobility Puerto Rico Neptuno Media No other carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 10/13/2011 Page 4 of 10

3. SUPPLEMENTAL SHOWING Pursuant to Part 25.203(c) of the FCC Rules and Regulations, the satellite earth station proposed in this application was coordinated by Comsearch using computer techniques and in accordance with Part 25 of the FCC Rules and Regulations. Expedited coordination data for this earth station was sent to the below listed carriers with a letter dated July 22, 2011. An Information-Only letter reducing the transmit power was forwarded on October 6, 2011. Company ALL AMERICAN CABLE AND RADIO INC AT&T Mobility Puerto Rico AT&T Mobility Virgin Islands, Inc. Aeronet Wireless Broadband Corp. CROWN CASTLE INT CORP DE PUERTO RICO EVERTEC, INC INTERISLAND TELEPHONE CORPORATION Iniciativa Tecnologica Centro Oriental Interference Office, Arecibo Observatory Neptuno Media Orizon Wireless Corporation PRWireless, Inc. PUERTO RICO ELECTRIC POWER AUTHORITY PUERTO RICO HIGHWAY AUTHORITY Puerto Rico Commonwealth of State Police Puerto Rico Telephone Company Sprintcom, Inc. Puerto Rico T-Mobile Puerto Rico LLC Frequency Coordination and Interference Analysis Report 10/13/2011 Page 5 of 10

4. EARTH STATION COORDINATION DATA This section presents the data pertinent to frequency coordination of the proposed earth station that was circulated to all carriers within its coordination contours. Frequency Coordination and Interference Analysis Report 10/13/2011 Page 6 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 10/13/2011 Job Number: 111006COMSGE01 Administrative Information Status ENGINEER PROPOSAL Call Sign Licensee Code GLOAME Licensee Name Global Crossing Americas Solutions, Inc Site Information ARECIBO, PR Venue Name MIRAMAR ARECIBO Latitude (NAD 83) 18° 28' 37.8" N Longitude (NAD 83) 66° 45' 16.3" W Climate Zone B Rain Zone 1 Ground Elevation (AMSL) 16.15 m / 53.0 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Digital Satellite Arc 45° W to 56° West Longitude Azimuth Range 128.5° to 149.1° Corresponding Elevation Angles 57.0° / 65.1° Antenna Centerline (AGL) 6.4 m / 21.0 ft Antenna Information Receive - FCC32 Transmit - FCC32 Manufacturer Prodelin Prodelin Model 2.4 Meter 2.4 Meter Gain / Diameter 38.0 dBi / 2.4 m 42.0 dBi / 2.4 m 3-dB / 15-dB Beamwidth 2.30° / 4.60° 1.50° / 3.00° Max Available RF Power (dBW/4 kHz) -17.6 (dBW/MHz) 6.4 Maximum EIRP (dBW/4 kHz) 24.4 (dBW/MHz) 48.4 Interference Objectives: Long Term -156.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Frequency Information Receive 4.0 GHz Transmit 6.1 GHz Emission / Frequency Range (MHz) 230KG7D - 2M23G7D / 3700.0 - 4200.0 230KG7D - 1M30G7D / 6094.0 - 6124.0 230KG7D - 1M30G7D / 6382.0 - 6423.0 Max Great Circle Coordination Distance 412.2 km / 256.1 mi 132.9 km / 82.6 mi Precipitation Scatter Contour Radius 100.0 km / 62.1 mi 100.0 km / 62.1 mi Frequency Coordination and Interference Analysis Report 10/13/2011 Page 7 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Coordination Values ARECIBO, PR Licensee Name Global Crossing Americas Solutions, Inc Latitude (NAD 83) 18° 28' 37.8" N Longitude (NAD 83) 66° 45' 16.3" W Ground Elevation (AMSL) 16.15 m / 53.0 ft Antenna Centerline (AGL) 6.4 m / 21.0 ft Antenna Model Prodelin 2.4 meter Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz Interference Objectives: Long Term -156.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -17.6 (dBW/4 kHz) Receive 4.0 GHz Transmit 6.1 GHz Horizon Antenna Horizon Coordination Horizon Coordination Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) Gain (dBi) Distance (km) 0 0.00 109.78 -10.00 412.20 -10.00 132.91 5 0.00 107.46 -10.00 412.20 -10.00 132.91 10 0.00 105.03 -10.00 412.20 -10.00 132.91 15 0.00 102.51 -10.00 412.20 -10.00 132.91 20 0.00 99.92 -10.00 412.20 -10.00 132.91 25 0.00 97.28 -10.00 412.20 -10.00 132.91 30 0.00 94.59 -10.00 412.20 -10.00 132.91 35 0.00 91.88 -10.00 412.20 -10.00 132.91 40 0.00 89.16 -10.00 412.20 -10.00 132.91 45 0.00 86.45 -10.00 412.20 -10.00 132.91 50 0.00 83.75 -10.00 412.20 -10.00 132.91 55 0.00 81.09 -10.00 412.20 -10.00 132.91 60 0.00 78.47 -10.00 412.20 -10.00 132.91 65 0.00 75.93 -10.00 412.20 -10.00 132.91 70 0.00 73.46 -10.00 412.20 -10.00 132.91 75 0.00 71.10 -10.00 412.20 -10.00 132.91 80 0.00 68.85 -10.00 412.20 -10.00 132.91 85 0.00 66.73 -10.00 412.20 -10.00 132.91 90 0.00 64.78 -10.00 412.20 -10.00 132.91 95 0.00 63.00 -10.00 412.20 -10.00 132.91 100 0.00 61.42 -10.00 412.20 -10.00 132.91 105 0.00 60.05 -10.00 412.20 -10.00 132.91 110 0.94 58.05 -10.00 261.22 -10.00 100.00 115 0.94 57.14 -10.00 261.30 -10.00 100.00 120 1.47 55.98 -10.00 226.63 -10.00 100.00 125 1.89 55.21 -10.00 204.94 -10.00 100.00 130 1.98 55.07 -10.00 200.48 -10.00 100.00 135 2.20 55.09 -10.00 191.83 -10.00 100.00 140 2.53 55.33 -10.00 180.15 -10.00 100.00 145 3.07 55.67 -10.00 162.62 -10.00 100.00 150 3.88 56.09 -10.00 143.00 -10.00 100.00 155 3.52 57.86 -10.00 151.23 -10.00 100.00 160 3.56 59.52 -10.00 150.24 -10.00 100.00 165 3.56 61.43 -10.00 150.26 -10.00 100.00 170 3.59 63.37 -10.00 149.84 -10.00 100.00 175 3.19 64.91 -10.00 159.39 -10.00 100.00 180 2.81 66.46 -10.00 170.74 -10.00 100.00 185 2.81 67.85 -10.00 170.74 -10.00 100.00 Frequency Coordination and Interference Analysis Report 10/13/2011 Page 8 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Coordination Values ARECIBO, PR Licensee Name Global Crossing Americas Solutions, Inc Latitude (NAD 83) 18° 28' 37.8" N Longitude (NAD 83) 66° 45' 16.3" W Ground Elevation (AMSL) 16.15 m / 53.0 ft Antenna Centerline (AGL) 6.4 m / 21.0 ft Antenna Model Prodelin 2.4 meter Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz Interference Objectives: Long Term -156.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -17.6 (dBW/4 kHz) Receive 4.0 GHz Transmit 6.1 GHz Horizon Antenna Horizon Coordination Horizon Coordination Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) Gain (dBi) Distance (km) 190 2.81 69.41 -10.00 170.74 -10.00 100.00 195 2.75 71.15 -10.00 172.75 -10.00 100.00 200 2.73 72.99 -10.00 173.41 -10.00 100.00 205 2.73 74.92 -10.00 173.42 -10.00 100.00 210 2.73 76.96 -10.00 173.43 -10.00 100.00 215 2.12 79.31 -10.00 195.02 -10.00 100.00 220 2.38 81.38 -10.00 185.52 -10.00 100.00 225 2.85 83.49 -10.00 169.43 -10.00 100.00 230 2.81 85.79 -10.00 170.49 -10.00 100.00 235 2.71 88.11 -10.00 173.95 -10.00 100.00 240 2.55 90.43 -10.00 179.45 -10.00 100.00 245 3.15 92.79 -10.00 160.63 -10.00 100.00 250 2.88 95.08 -10.00 168.38 -10.00 100.00 255 2.23 97.20 -10.00 190.75 -10.00 100.00 260 1.44 99.13 -10.00 228.56 -10.00 100.00 265 1.06 101.05 -10.00 250.22 -10.00 100.00 270 0.95 102.97 -10.00 259.89 -10.00 100.00 275 0.95 104.85 -10.00 259.86 -10.00 100.00 280 0.70 106.47 -10.00 290.94 -10.00 100.00 285 0.49 107.97 -10.00 323.24 -10.00 108.46 290 0.00 109.11 -10.00 412.20 -10.00 132.91 295 0.00 110.44 -10.00 412.20 -10.00 132.91 300 0.28 111.86 -10.00 385.68 -10.00 124.91 305 0.20 112.83 -10.00 410.58 -10.00 132.41 310 0.00 113.49 -10.00 412.20 -10.00 132.91 315 0.00 114.14 -10.00 412.20 -10.00 132.91 320 0.00 114.61 -10.00 412.20 -10.00 132.91 325 0.00 114.87 -10.00 412.20 -10.00 132.91 330 0.00 114.94 -10.00 412.20 -10.00 132.91 335 0.00 114.80 -10.00 412.20 -10.00 132.91 340 0.00 114.46 -10.00 412.20 -10.00 132.91 345 0.00 113.92 -10.00 412.20 -10.00 132.91 350 0.00 113.19 -10.00 412.20 -10.00 132.91 355 0.00 111.98 -10.00 412.20 -10.00 132.91 Frequency Coordination and Interference Analysis Report 10/13/2011 Page 9 of 10

5. CERTIFICATION I HEREBY CERTIFY THAT I AM THE TECHNICALLY QUALIFIED PERSON RESPONSIBLE FOR THE PREPARATION OF THE FREQUENCY COORDINATION DATA CONTAINED IN THIS APPLICATION, THAT I AM FAMILIAR WITH PARTS 101 AND 25 OF THE FCC RULES AND REGULATIONS, THAT I HAVE EITHER PREPARED OR REVIEWED THE FREQUENCY COORDINATION DATA SUBMITTED WITH THIS APPLICATION, AND THAT IT IS COMPLETE AND CORRECT TO THE BEST OF MY KNOWLEDGE AND BELIEF. Jeffrey E. Cowles Engineer III, Telecommunications COMSEARCH 19700 Janelia Farm Boulevard Ashburn, Va. 20147 DATED: October 13, 2011 Frequency Coordination and Interference Analysis Report 10/13/2011 Page 10 of 10


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