The PA-F FDDI Port Adapters provide a half-duplex FDDI connection for single-mode or multimode fiber-optic cable. The two physical ports (PHY A and PHY B) are available with either single-mode (SC-type) or multimode media interface connector (MIC) receptacles. Each FDDI connection allows a maximum bandwidth of 100 Mbps per the FDDI standard.This PA-F FDDI port adapter from Cisco is a refurbished product.