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C C Data Acquisition/Archiving CAS' laboratory data is acquired directly or locally and then transferred to the centralized acquisition server. All data is eventually moved to the centralized data acquisition server for reporting and archiving. At a minimum, our data systems are backed up every 24 hours. Incremental backups are performed several times during the day. The entire system is backed up twice a month and is stored in secure areas both on and off site. E-mail and Data Transfer All CAS facilities are linked via an e-mail system internally and through an Internet provider for external messaging. These links have improved communication between our facilities and with our clients. E-mail has also allowed us greater flexibility and responsiveness in project management. Our data can be electronically transferred via diskette, direct modem transfer to our client's host, or by the Internet when system compatibility issues are satisfied. System Security No direct extemal, non -CAS access is _ allowed to any of our network systems. The LAN is not open for direct external access. The WAN is configured for CAS use only via a frame relay. The frame relay is a dedicated connection from a trusted agent. Our external e-mail system and internet access is set up via a single gateway to prevent unauthorized entry. We have a closed system for company a -mail. Passwords are required on both systems. Files, such as electronic deliverables, are sent through the external e-mail system only via a trusted agent. CAS has standardized on MS Exchange® for internal e-mail messaging. Our external messaging system operates through a single secure gateway. This gateway provides a virus scan for all attachments sent in and out of the gateway. Because the Internet is not regulated, we use a limited access approach to provide a firewall for added security. Virus screening is performed in real time on all network systems. Page 28 of 29 L 0