Viper Analysis Report - 11-17-2011 - 1 - Attachment 2

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CTA Communications Orange RaCE Test Report 5.1.2 Signal Level This performance specification involves defining the minimum receiver signal level required to provide the desired level of understandability. For example, a typical grade of service specification could be, "a median 0.5 microvolt signal at the receiver antenna terminal." 5.2 Service Area and Conditions The service area is the area in which two -way radio communications are required; the radio system should meet the desired CPC throughout the service area. Often the service area is defined by a political or municipal boundary. It is also necessary to define the conditions associated with the service area. These conditions include requirements such as outdoor or indoor coverage, building penetration, portable or mobile coverage, portable at the hip and /or portable at the head level. For the Orange County testing, the service area was defined as the County's political boundary and the radios were set up to simulate portable at the hip coverage. 5.3 Validated Service Area Reliability Validated service area reliability is defined as the percentage of locations in the service area to and from which radio communications meet or exceed the desired CPC. The validated service area reliability value in per cent is calculated by dividing the number of valid test measurements within the defined service area that meet or exceed the required CPC divided by the total number of valid test measurements. The entire concept of conformance testing relies on statistics. Validated service area reliability is determined on the basis of measuring a statistically significant number of random test locations, uniformly throughout the defined service area. These required statistical elements are defined in the TIA/EIA TSB -88 -B. 5.4 Continuous By Time Test Mode This test was set up as a pre- determined drive route to get a sampling of data throughout the County. In order to maximize the data collected, we utilized the Continuous by Time test mode. With continuous by time testing, tests are performed whenever the specified time interval has passed. For Orange County testing the test interval was set for 20 seconds. 5.5 Test Sampling The RaCE test set is capable of gathering samples on the basis of talk -in and talk -out DAQ measurements and /or talk -out RSSI measurements. For these tests, both were collected. 5.5.1 DAQ Test Sample A DAQ test sample is a single talk -in or talk -out evaluation performed at a test location. The test is initiated when the mobile unit enters an untested grid in the "gridded" test mode. The mobile unit sends a test message to the stationary unit (talk -in). The location established for this talk -in transmission is the latitude and longitude of the mobile unit when the message began. The stationary unit records this mobile talk -in transmission _10- H MM I AECO M