Describes the framing and signaling interface of a high performance serial link for support of FC-4s associated with upper level protocols (e.g., SCSI, IP, SBCCS, VI). FC-FS (along with FC-PI) is the combination of the FC-PH [1], its amendments 1 [2] and 2 [3], FC-PH-2 [4] and FC-PH-3 [5] standards. This standard also deletes or obsoletes outdated functions and features from those standards.