Specifies the next generation of the protocol portion of the current Serial Attached SCSI. It follows SPL-4, SPL-3, SPL-2, SPL, and the protocol portions of SAS-2, and SAS-1.1. The following items should be considered for inclusion in SAS Protocol Layer - 5: enhancements to the protocol; corrections and clarifications; and other capabilities that may fit within the scope of this project.