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Redwood City Police <br /> Department System Description <br /> l;� <br /> RADIO NETWORK CONTROZLER <br /> The Radio Network Controller(RNC)is the core of the Redwood <br /> City, Foster City, and Hillsborough Police Mobile Data System. <br /> The RNC provides the interface between the host site ec�uipment <br /> and the radio base site tha.t comprise the network backbone. As <br /> designed for this system,the RNC is configured to acconzmodate <br /> up to 8 initial base site data stations and is expandable to support a <br /> total of 64 stations. <br /> The major function of the RNC is to route messages between the <br /> CAD system and the Mobile Data Devices (MDDs)while ensuring <br /> reliable delivery to each in the correct protocol. In doing this, the <br /> RNC maintains a de�tailed database of the operational parameters <br /> and performance status of all hackbone and device system <br /> components. <br /> The RNC is based on a VME azclutecture utilizing a Motorola <br /> 68030-based control processor with 3.5" floppy drive,hard disk <br /> drive, and a configurable number of 68020-based UO processors. <br /> The design is modulaz in order to accommodate various radio site <br /> `' configurations. - - - - � <br /> The chassis of the RNC provides the housing for the system <br /> components, a power supply, cooling fans, and AC power control. <br /> The RNC utilizes this powerful azchitecture to perform the <br /> functions described below: <br /> Message Routing � <br /> The RNC routes messages between the message switch and the <br /> NIDDs by establislung a link with the most appmpriate backbone <br /> site. This function is based on a dynamic registration table that <br /> constantly tracks each NIDD using the inbound signal strength of <br /> transmissions. In this way, the RNC's registration table � <br /> automatically decides which site to key for message transmission. <br /> This leaves the remaining backbone site open and available to send <br /> and receive messages if no areas of coverage overlap exist. <br /> Protocol Conversion <br /> The RNC is responsible for receiving host initiated messages, <br /> , converting them to the Radio Data Link Access Proceduere <br /> QMOTOROLA ' 2 ' 2 <br /> . _ _ _ _ <br />