A fiber channel is a high-speed network that connects a number of computer systems and provides a dependable and remote OS interface that requires high bandwidth. The E_port is the point where frames pass between fabric switches. A frame with a destination exits a local switch through an E_port, unless the frame is intended for the switch, N_Port or NL_Port. After a frame passes through the E_port, it is forwarded to a local or final destination.

Each E_port has a unique name within the fabric. An interactive system language (ISL) is used to transmit and receive frames within the fabric, N_port and NL_port. The E_port supports Class 2, Class 3 and Class F services.