RTSASR-12X RTSASR-12X is a 12-port, 3 Gigabit Serial Attached SCSI Expander (SAS Edge Expander). RTSASRFO-12X RTSASRFO-12X is a 12-port, 3Gb/s Serial Attached SCSI (SAS) Fanout Expander. RT12XSAS RANCHO 12PORT 3GB SAS EDGE EXPANDER RT12XSAS$845.00 RTSASR-12X RANCHO 12 PORT 3GB SAS EXPANDER RTSASR12X$1,340.00 RTSASRFO-12X RANCHO 12 PORT 3GBIT SAS FANOUT RTSASRFO12X$1,420.00