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t i ti Data Acquisition/Archiving i I 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. I I At a minimum, our data systems are backed up every 24 hours. Incremental backups i 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. 1 E-mail and Data Transfer I All CAS facilities are linked via an e-mail system internally and through an Internet j 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 j diskette, direct modem transfer to our client's host, or by the Internet when system compatibility issues are satisfied. I System Security No direct external, 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 e-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 I 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. i i i i I Page 28 of 29