STI Proprietary1 St. Louis, MO September 21 st, 2004 AmpLink Rx 1900e GSM Field Trial

STI Proprietary2 AmpLink Rx 1900e Contents Trial Area and Site Description Trial Timeline of Events AmpLink 1900e – Nokia Interconnect Network Statistics Drive Data Analysis Trial Summary Next Steps...

STI Proprietary3 Trial Area Located in North St. Louis Sub-Urban Morphology Average Cell Radius 1 mile

STI Proprietary4 Trial Area Detailed View Trial Site

STI Proprietary5 Trial Site Details Site Name:MO Site Coordinates: N W Tower Height:~ 130 feet Coax Length:~ 150 feet Coax Size:1 ¼” Diameter

STI Proprietary6 Trial Timeline

STI Proprietary7 Trial Timeline – August 9 th Pre-Meeting and Site walk – August 16 th Installation Week – August 24 th Collect pre-drive data Install Amplink 1900e and pre-stage cables during day Cutover Amplink 1900e during Maintenance Hours – September 8 th Collect post-drive data, (same day same time as Pre Drive) – September 21 st Analysis Completed and Presented

STI Proprietary8 Amplink 1900e Integration

STI Proprietary9 Amplink 1900e Integration

STI Proprietary10 Network Statistics

STI Proprietary11 Statistic collected by Operator and provided to STI 2 weeks Prior and Post deployment analyzed Weekends INCLUDED in the analysis Labor Day removed from analysis Pre Data:August 11 th to 24 th Post Data:August 25 th to September 8 th * Analysis method determined by Network Operator Network Statistics

STI Proprietary12 MOUs / Drop per Sector The Statistics All Sectors achieved a higher MOU/Drop value with AmpLink 1900e. Alpha and Beta sectors are now above acceptable limit of 153 MOUs/Drop. SectorPrePost Improve ment Alpha % Beta % Gamma %

STI Proprietary13 Drop Calls per Sector SectorPrePost Improve ment Alpha % Beta % Gamma % The Statistics All Sectors indicate an average 50% reduction in the number of Drop Calls.

STI Proprietary14 Uplink Quality per Sector The Statistics Uplink quality / BER on all sectors reduced by 20% with AmpLink 1900e. SectorPrePost Improve ment Alpha % Beta % Gamma %

STI Proprietary15 Downlink Quality per Sector The Statistics As expected the Downlink quality on all sectors was unchanged by the class-leading low insertion loss of the AmpLink 1900e. SectorPrePost % Change Alpha2.08 0% Beta % Gamma %

STI Proprietary16 Handovers due to Quality per Sector The Statistics HO Qual was improved by 20% on all sectors with AmpLink 1900e. SectorPrePost % Change Alpha % Beta % Gamma %

STI Proprietary17 In-Bound Handover Fails per Sector The Statistics All Sectors achieved a lower IHO Failure rate. SectorPrePost Improve ment Alpha % Beta % Gamma %

STI Proprietary18 Drive Data Analysis

STI Proprietary19 Best Server BCCH Map Before As expected, no change in best server coverage. After

STI Proprietary20 MS TX Power dBm Before Before the Amplink installation, drive data indicates T730 has uplink problems compared to adjacent sites. Amplink’s sensitivity improvement corrects the problem. After

STI Proprietary21 Downlink Coverage Site T730 Only Before As expected, no change in downlink RSSI. After

STI Proprietary22 MS Tx Power dBm Site T730 Only Before Drive data is trimmed above to clearly show the uplink improvement to T730 is in all sectors. Adjacent site data points removed (i.e. Trimmed by Best Server). After

STI Proprietary23 MS Tx Power Improvement Grid Before / After Before and After Drive data is averaged into grids and then compared to calculated the Delta in MS Tx Power. Statistics Before vs. After Delta Improvement Average-10.1 dB Median-12.2 dB

STI Proprietary24 Trial Summary

STI Proprietary25 Trial Summary MOUs/DropOver 60% increase on all sectors # of Drop CallsReduced by 50% Uplink QualityImproved by at least 20% Downlink QualityAs expected, un-changed HO QualReduced by 20% MS Tx PowerLowered by more than 10 dB Amplink 1900e is a Success ! StatisticImprovement