Similar in concept to a SATA port multiplier is a SAS expander which enables one or more ports to be able to fan-out to multiple ports for device attachment. SAS supports attachment of both SAS and SATA devices including support for multiple lanes over a single port including SATA Tunneling Protocol (STP). Learn more about SAS at the SCSI trade organization site www.scsita.org and SATA at the SATA I/O organization www.sata-io.org.
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