SCSI products include SCSI host adapters and controllers, SCSI converters, SCSI terminators, and SCSI switches.  Small Computer Systems Interface (SCSI) is an intelligent I/O parallel peripheral bus with a standard, device-independent protocol that allows many peripheral devices to be connected to the SCSI port. A single SCSI bus can drive up to eight devices or units: the host adapter or controller, and seven other devices. Each device is assigned a different SCSI ID, ranging from 0 to 7.  SCSI standards, product form factor, signalling type and level, terminator class, and terminator type are all important parameters to consider when searching for SCSI products.