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Most E911 PSAP telephone equipment will output the ALI/ANI data via a standard RS232 serial port. The output of that serial port on the PSAP telephone equipment is connected to an RS232 serial port on the computer where the E911 interface application is running via a standard serial data cable. The Crimestar E911 Interface application reads the data received via the RS232 serial port, parses the data and delivers it to Crimestar CAD via the network. The diagram below
illustrates a typical network configuration where the E911 Interface sits on a
network segment with CAD workstations and an MDC Controller and passes real-time
ANI/ALI data from the PSAP equipment to the Crimestar database and CAD
workstations.
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