4.2. The SCSI Architectural Model
The SCSI-3 family of standards introduced several new variations of SCSI commands and a protocol, including serial SCSI-3 and special command sets for streaming and media handling required for tape. As shown in Figure 4-3, the command layer is independent of the protocol layer, which is required to carry SCSI-3 commands between devices. This enables more flexibility in substituting different transports beneath the SCSI-3 command interface to the operating system. In small desktop video editing systems, for example, IEEE 1394 FireWire can be used for high-speed but limited-distance SCSI-3 serial bus transactions to peripheral equipment.
Figure 4-3. SAM-2 SCSI-3 standards functional layers. Implementations such ...
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