FOUNDATION HSE is based on unmodified IEEE 802.3 Ethernet and, therefore, is compatible with standard Ethernet equipment. Unlike mere "ring topology,” FOUNDATION HSE provides complete "DCS style" redundancy with redundant network switches, redundant devices, and redundant communication ports ensuring unsurpassed availability. FOUNDATION HSE is also based on standard IP, enabling it to coexist with other devices and ensuring compatibility with standard tools. At the highest level, FOUNDATION HSE includes a standard application layer that provides interoperability between devices beyond the mere coexistence provided by Ethernet and TCP/IP. FOUNDATION HSE communication is schedule-driven to minimize dead-time and jitter with support for peer-to-peer communication directly between devices. Again, a rigorous interoperability testing program ensures quality connectivity.