The Fibre Channel Backbone - 3 (FC-BB-3) standard consists of four distinct Fibre Channel mappings resulting in the following four models: - FC-BB-3 ATM (FC over ATM backbone network) - FC-BB-3 SONET (FC over SONET backbone network) - FC-BB-3 IP (FC over TCP/IP backbone network) - FC-BB-3 GFPT (FC over SONET/SDH/OTN/PDH backbone network using GFPT adaptation).