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7 All of these three data communications network alternatives will function with the TCP /IP data communications protocol. Anoka County law enforcement agencies will need to move to one of these high data rate communication links by the year 2005 in order to accommodate the emerging needs. The one that should be selected will be based on, first of all, the capability of meeting the performance requirements of the law enforcement agencies, and then an evaluation of the cost, the reliability and the security of the network. None of these high data rate communication links is available now. Anoka County should, however, be working toward utilization of the high data rate communication link when it becomes available in the future. This means that any short -term enhancements of data communications should, if possible, be consistent with the requirements for utilization of one of those high data rate communication links in the future. 2.2 Short-term Mobile Data Communications Considerations The existing mobile data communication system in Anoka County is not able to handle the traffic that is offered, even without any enhancements or additional functions being added to the mobile data communication system. Since the new high data rate communications links will not be available for several years, a short-term enhancement of the existing mobile data communication network must be implemented. The existing mobile data communication network might be enhanced in three alternative ways. Each of those is discussed further in this section of this report. 2.2.1 Temporary Use of a NPSPAC 800 MHz Channel This altemative would involve submitting a petition to the Metropolitan Radio Board for temporary use of a NPSPAC 800 MHz radio channel, and use that channel for the existing 4,800 BPS raw data rate communication system for the existing mobile data terminals, using the existing Motorola mobile data controller. Then, utilize the existing 806 MHz channel with a new Motorola RNC controller, communicating at 19.2k BPS raw data rate for laptop computers in vehicles. This will provide two channels in place of the existing single channel, and the second channel would have four times the data rate of the existing channel. This will provide sufficient traffic carrying capability to handle the traffic offered to the mobile data network now and provide more traffic carrying capability for the addition of enhanced functionality, such as the ability for law enforcement officers to prepare reports in their vehicles and transmit them by radio into the records management system.