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17 • The estimated project costs include CDPD interfaces for 100 units. Approximately 40 additional interface licenses will need to be purchased if all present users of mobile data terminals migrate to use of laptops communicating over the CDPD network. The law enforcement departments that currently use mobile data terminals will also need to buy the laptops and CDPD modems, and other vehicle hardware required for migrating to use of the CDPD network with laptops. Each user of the CDPD network will also need to pay a charge of $50 per month per laptop to AT &T for use of the network during the period that the CDPD network is used. All of these costs are in addition to the estimated project cost figures that are included in the 2001 capital budget for the mobile data system upgrade. 3.9 SCHEDULE The plan for implementing the CDPD data link as indicated in the 2001 capital budget for the mobile data system upgrade shows a completion date of May 31, 2001. It is recommended that this upgrade to use the CDPD network be accomplished at about that time. The PSSI computer -aided dispatch interface to the CDPD network and the VisionAir interface to the CDPD network should also be completed by May 31, 2001, so that those systems will be ready when the cutover to the CDPD occurs. This will require that both PSSI and VisionAir implement the TCP /IP communications protocol, and the applications software for the computer -aided dispatch interface and the records management interface also must be developed by that May 31, 2001 date. The PSSI to VisionAir intersystem interface should also be completed by May 31, 2001. This will allow access to closed event history data, and allow the population of fields in report formats as soon as the CDPD system becomes available for use. The upgrade of the interface with the State of Minnesota Criminal Justice Information System and Criminal Justice Reporting System to use of the TCP /IP protocol should be implemented as soon as VisionAir is able to accomplish this. The state requires that the interface use TCP /IP on or before July 1, 2001. Installation of the jail management and civil process software modules to the records management system should be accomplished as soon as possible.