Internal ports: Fourteen internal full-duplex Ethernet ports that can operate at 1 Gb or 10 Gb speeds
External ports: Fourteen ports for 1 Gb or 10 Gb Ethernet SFP+ transceivers (support for 1000BASE-SX, 1000BASE-LX, 1000BASE-T, 10GBASE-SR, or 10GBASE-LR) or SFP+ copper direct-attach copper (DAC) cables
Unmanaged device that has no internal Ethernet management port, but is able to provide its vital product data (VPD) to the secure management network in the Chassis Management Module
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.