1.The main and spare power supply ensure the system keep working uninterruptedly 2.Support AC220V and DC-48V power supply,enable the system be used in different environment 3.Support various model cards working simultaneiously,greatly enhanceed the application of system 4.Support the hot inserting and pulling function on each model card 5.Supporting Cards:FC830AC intelligent series--Link Failure Alert ,10/100Mseries,ect.