This 4-port adapter has a SSA (Serial Storage Architecture) interface which allows to transfer data up to 80 Mbytes/sec. SSA 160 increases the rate to 160 MBps. SSA's ring configuration allows remaining devices to function if one fails. SCSI software can be mapped over SSA allowing existing SCSI devices to be used. While distances of SCSI cables are measured in feet, SSA cable can be up to 25 meters over copper and 2.4 kilometers over fiber