X3T9.2/91-73 Rev 0

                         To:  X3T9.2 Committee

                    Subject:  SCSI Bus Type Identification

                       Date:  May 18, 1991

                       From:  I. Dal Allan

As a complement to John's proposal X3T9.2/91-49, I suggest the use of two 
symbols to help identification of cable and receptacle (especially on the 
back of a machine pushed up against a wall). This symbolism would be used in 
addition to the text recommended by John. 

     Single Ended:  A circle

     Differential:  A square

Within the center of each, a character to identify the type of cable:

     A = A-Cable
     B = B-Cable
     P = P-Cable
     Q = Q-Cable

NOTE: It is necessary to identify the A-Cable because it could have either a 
50-pin connector, or a 68-pin connector with only the A-bus terminated.

If a machine can support both Single Ended or Differential (but not at the 
same time) then it would be marked with both, and a slide used to cover the 
one not applicable in particular configurations. 

If a cable can support either Single Ended or Differential, it would be 
marked with both.