Cisco Systems introduces PA-F/FD port adapters, which provide a full-duplex FDDI interface for both single-mode and multimode fiber-optic cable. The two physical ports (PHY A and PHY B) are available with either single-mode (SC) or multimode media interface connector (MIC) receptacles. Each FDDI connection allows a maximum bandwidth of 100 Mbps, per the FDDI standard for half-duplex operation, and 200 Mbps aggregate bandwidth with full-duplex operation enabled.The PA-F/FD-MM is a multimode, PHY-B multimode port adapter with optical bypass switch capability and full-duplex capability. Note that PA-F/FD-MM is not supported on Cisco 7200 VXR routers.