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<br />5 <br /> <br />collisions suddenly prevents any of the messages from getting through at all and the <br />system locks up. It continues to be locked up until all the mobile units have finished all <br />their retransmissions and provided a message to their vehicle operator that the <br />message could not be transmitted. At that pOint the system clears itself and persons <br />with mobile terminals are able to transmit messages, and eventually collisions occur <br />which causes retransmissions, which causes even more collisions - and the system <br />locks up again for awhile. This is a common occurrence in afternoon and evening <br />hours, especially during summer months, in the Anoka County data communication <br />system. It essentially destroys much of the value of the mobile data communication <br />system, as persons mustthen resort to use of voice traffic, which is also very <br />congested, in order to transmit information that could otherwise be transmitted in digital <br />form. <br /> <br />The existing Anoka County mobile data communication system is not able to transmit <br />additional information, for example, the transmission of reports. <br />