The adapter performance has been optimized while being designed to make system I/O no longer the bottleneck of network application. It can be grouped up together by other adapters to achieve fault tolerance as well as combine the communicating routing from the faulted port with others in the same group to guarantee its non-stop network communications. The Fiber Network Adapter with excellent noise immunity is applicable for Gigabit Ethernet Network. Its power supply has been changed into American TI high-efficiency supply management controller with low heat release, high efficiency and high stability.