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occurs when a radio goes out of range for longer than a pre-selected amount of time. These de- <br /> registration processes help to ensure that precious frequency resources are not wasted. <br /> Automatic Site Switching <br /> One of the key features of a wide area trunking system is its ability to proactively select the <br /> optimum site as a radio user moves throughout the coverage area. Using Receive Signal Strength <br /> Indication (RSSI),the radio is able to monitor the signal strengths of control channel frequencies <br /> at adjacent sites and automatically make the necessary site changes when appropriate. The result <br /> is improved user communications by operating on the optimum RF site. <br /> Preferred Site <br /> Preferred Site operation allows a radio to search for an alternative, pre-programmed site that is <br /> operationally preferred over the current site. A radio will look for a preferred site when it roams <br /> into another site in the system. If a unit is in an overlap area of muitiple sites, it will favor its <br /> preferred site. This capability allows users to more intelligently manage and conserve repeater <br /> resources in coverage overlap areas. <br /> Dynamic Site Assignment (Voice Only) <br /> Dynamic Site Assignment ensures that STARCOM2] users have maximum system channel <br /> efficiency as the system utilizes channels only at sites where active talkgroup members are <br /> located. <br /> Scan Operation on STARCOM21 <br /> A subscriber unit can only scan talkgroups when the user radio is affiliated at the same site as the <br /> desired scan talkgroups. In a wide area system, sites are only added to a call when a radio user at <br /> a particular site has that talkgroup selected.This is done to conserve freyuency resources and <br /> maintain the Grade of Service(GOS). <br /> STARCOM21 User Features (Voice Only) <br /> The following features are designed to make the system easier to use for the radio operators. <br /> Busy Queuing and Callback <br /> Although trunking systems are considerably more frequency efficient than conventianal radio <br /> systems, there may still be times on STARCOM21 when all of the voice channels are busy. If a <br /> radio user attempts to initiate a call while all the system channels are in use,the requesting user <br /> will be put into a Busy Queue and then automatically notified when a channel becomes available. <br /> This feature allows the radio user to place the microphone down during a busy situation instead of <br /> continually re-keying in an effort to gain channel access. <br /> Multiple Priority Levels <br /> STARCOM21 provides multiple levels of priority allowing system access to the most critical <br /> users during busy periods. Individual users and talkgroups of users may be assigned specific <br /> priority level(s), with up to l 0 levels supported for each, which wili allow higher priority users to <br /> be placed higher in the busy queue for quicker system access. The system allows for flexible <br /> CSA.NoESS.FINAL.4-8-08 6 <br /> Motorola Contract No. 08-17033/LF <br />