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Redwood� City Police <br /> Department System Performance <br /> time interval before retransmittin8• This ensures�e collision does <br /> t � <br /> not occur twice. <br /> The R.D-LAP over-the-air protocol contains a series of features that <br /> provide many levels of security from unauthorized�monitoring. An <br /> individual desiring to monitor the system without a Motorola <br /> Mobile Data Terminal and data radio registered to the Mobile Data <br /> System would need to cany out a number of compiicated tasks. <br /> The features that make the RD-LAP protocol, and overall system, <br /> secure are:. - <br /> • A specialized and unique data-to-radio interface <br /> • A proprietary RF modem and signaling scheme <br /> • A proprietary message encoding/decoding algorithm <br /> • Unique destination addresses for all messages. <br /> SYSTEM CAPACTTY <br /> In order to determine system capacit5'�Motorola has developed a <br /> specialized computer simulation model that can account for the <br /> performance of the RNC,the Data Base�Stations,the radio channel <br /> � and the Mobile Data Term.inals included:in this Mobile Data <br /> System. This model is very accurate in its representations and has <br /> been successfully tested many times against the actual <br /> , implementation of Mobile Data Systems. As opPosed to a set of <br /> equations that rely on assumptions,this model generates and <br /> follows the path of over an hour of inessage traffic�. �c�� <br /> this model used to analyze the system capacitY Pr SY <br /> response time is presented below. This model is implemented <br /> using the commoaly available General PurPose Simulation System <br /> application. � . <br /> _ <br /> QrvroROr.a . 3 -�5 <br /> . <br /> _ <br /> ___ _ _ <br />