Niagara 2260 Dual Gigabit Ethernet Server Adapters is built on Intels Gigabit technology and Interface Masters sterling design and customer service. Niagara 2260 is optimized to support 64-bit/133MHz PCI-X bus based systems. Niagara 2260 is designed with a built-in bypass circuit to provide maximum up time for the network. The Bypass circuit takes the Niagara 2260 ports off line in case of either power or software failure. The bypass circuit works in absence of power. http://www.interfacemasters.com/products/2260.html