The ADS/ADS-Lite or OAS on a desktop operating system does not come with, and does not require, device or user CALs. Only the Metasys servers with server operating systems require CALs.
To avoid ADS/ADS-Lite or non-server based OAS connection and network communication performance issues, the number of users and the number of network engines and ADS/ADS-Lite or non-server based OAS computers that transfer trend data, event messages, and audit messages must not exceed 15. The maximum number of engines is between ten and fourteen depending on the number of simultaneous users supported on the system. Ten engines support a maximum of five simultaneous users. Fourteen engines support one user. If a Metasys site with a single ADS/ADS-Lite or non-server based OAS configured as the Site Director and default repository exceeds that number of connections, consider one of the following options:
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Migrate to an ADX or server-based OAS. Configure the Windows Server of the ADX/OAS computer with the number of CALs equal to the total number of users or devices accessing the ADX/OAS.
Refer to the Metasys® System Configuration Guide (LIT-12011832) for performance guidelines and limitations.