SCSI cables and terminators.

SCSI is a bus technology that can be connected to the "Daisy Chained" so there can be connected to multiple SCSI devices on same bus. SCSI was right prevalent back in the 80s and 90s. Typically, one might get the RAID controller and server with SCSI onboard. There are are 3 types of SCSI devices.

SCSI cables and terminators.

SCSI is a bus technology that can be connected to the "Daisy Chained" so there can be connected to multiple SCSI devices on same bus. SCSI was right prevalent back in the 80s and 90s. Typically, one might get the RAID controller and server with SCSI onboard. There are are 3 types of SCSI devices.

-Singel Ended SE

-Differential SCSI 

-LVD Low Voltage differential.

Connection is external or internal. There has through the years been an evolution of SCSI connectors, so that today there are many different in order hastiged. Always terminate the SCSI drivers. The last device on the SCSI bus.