ISO/IEC 14776-261:2012(E) defines the protocol layer of the Serial Attached SCSI (SAS) interconnect and three transport protocols that use the SAS interconnect:
- Serial SCSI Protocol (SSP): a mapping of SCSI supporting multiple initiators and targets,
- Serial ATA Tunneled Protocol (STP): a mapping of Serial ATA expanded to support multiple initiators and targets, and
- Serial Management Protocol (SMP): a management protocol.