The Lenovo Flex System EN4091 10Gb Ethernet Pass-thru offers easy connectivity of the Flex System chassis to any external network infrastructure. This unmanaged device enables direct connectivity of the compute node in the chassis to an external top-of-rack data center switch. This module can function at both 1 Gb and 10 Gb Ethernet speeds. It has fourteen internal 10 Gb links, and fourteen external 10 Gb SFP+ uplinks.