                  Proposed SCSI-3 Standards Architecture (*)
+------+ +--------------+ +--------------+ +--------------+ +--------------+
|      | |SCSI-3 Block  | |SCSI-3 Stream | |SCSI-3 Graphic| |SCSI-3 Medium |
|  A   | |Commands (SBC)| |Commands (SSC)| |Commands (SGC)| |Medium Changer|
|  r   | +--------------+ +--------------+ +--------------+ |Commands (SMC)|
|S c M |        |                |                |         +--------------+
|C h o |        +--------------------------------------------------+        
|S i d |                  | SCSI-3 Primary Commands (SPC) |                    
|I t e |          +-----------------------------------------------+         
|  e l |          |               |               |               |         
|3 c   |   +-------------+ +-------------+ +-------------+ +--------------+ 
|  t   |   |   SCSI-3    | |   SCSI-3    | |   SCSI-3    | |SCSI-3 Generic| 
|  u   |   | Interlocked | |Fiber Channel| | Serial Bus  | |  Packetized  | 
|  r   |   |  Protocol   | |  Protocol   | |  Protocol   | |  Protocol    | 
|  e   |   |    (SIP)    | |    (FCP)    | |    (SBP)    | |    (GPP)     | 
|      |   +-------------+ +-------------+ +-------------+ +--------------+ 
|(SAM) |          |               |               |               |         
|      |   +-------------+ +-------------+ +-------------+ +-------------+  
|      |   |   SCSI-3    | |             | | IEEE  P1394 | |             |  
|      |   |  Parallel   | |    Fibre    | |    High     | | Almost any  |  
|      |   |  Interface  | |   Channel   | | Performance | | Interface   |  
|      |   |    (SPI)    | |   (FC-PH)   | | Serial Bus  | |             |  
+------+   +-------------+ +-------------+ +-------------+ +-------------+  

(*)  This chart reflects current X3T9.2 thinking.  Several of these projects 
     are under development.  Others have been proposed, but have no draft 
     document yet.  The Fibre Channel project is in X3T9.3 and the P1394 
     project is in IEEE.

(File SCSI-3.TXT last updated 3/12/93)
