AT-2711FX Fast Ethernet Fiber Network Interface Card design gives you the maxim possible bandwidth and bus efficiency other benefits are: capability and Low Power Consumption. For the current customers who are using Allied Telesis 100Mbps Fiber cards (AT-2701FX) and want to upgrade their systems to PCI-Express AT-2711FX Fast Ethernet Fiber Network Interface Card is the ultimate solution.The customers can continue using their existing 100Mbps Fiber network without adding any more new equipment. It is a single pack.