FC-4 (Mapping) defines how a FC network communicates with upper level protocols (SCSI and IP). Each upper-level protocol (ULP) that is transportable over FC has a map for it in FC-4.
FC-3 (Common Services) is used by applications requiring more than one port, such as striping.
FC-3 (Framing) is similar to MAC layer in OSI. It defines how data from upper level applications is slit into frames for transport over the lower layers.
FC-1 and FC-0 are similar to physical layer in OSI. FC-1 (Ordered Set) defines how frames are encoded and decoded for transport across those media types. FC-0 (Physical) defines the various media types that can carry FC data.
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