Consists of distinct Fibre Channel mappings resulting in the following models: - FC-BBIP (FC over TCP/IP backbone network) - Transparent FC-BB consisting of: - FC-BBGFPT (FC over SONET/SDH/OTN/PDH backbone network using GFPT adaptation) - FC-BB_PW (FC over MPLS network using PW adaptation) Figure 1, figure 2, and figure 3 illustrate the scope and the major components of the FC-BB-4 models and its relationship to the IETF and ITU-T standards.