The PA-2FEISL provides two 100-Mbps, 100BaseT Fast Ethernet/ISL interfaces for the VLAN transport over switch-to-switch backbone connections or switch-to-server data center attachments. These port adapters provide an inter-VLAN bridging and routing functionality that network administrators can use to deploy 100-Mbps Token Ring VLAN transport, 100-Mbps Ethernet VLAN transport, and bridging or routing between the mixed LAN types using the same physical ISL trunk links. The PA-2FEISL supports both full-duplex and half-duplex operations.