The at 2911 series gigabit ethernet network adapters are integrated ethernet network interface cards based on broadcoms bcm5718 chipset with a pci express pcie x 1 version 2 interface the at 2911 series adapter connects a pcie compliant computer to a gigabit ethernet network allied telesis offers models equipped with a single port interface or dual port interface in the at 2911 series the at 2911 adapter is equipped with single or dual fiber optic connector copper connector sfp slo