Definition - What does SCSI-5 mean?
SCSI-5 is also called Ultra SCSI because of the speeds that the connector and cable are capable of.
Techopedia explains SCSI-5
SCSI-5 was designed for high performance with little impedance and resistance, allowing for faster transfer speeds. It is the connector of choice for most advanced SCSI multiport applications such as Ultra SCSI Fast-20, low-voltage differential signaling (LVDS) technology and in RAID cards.