15 October 1990

TO: John Lohmeyer, Chairman X3T9.2

FR: Bill (D.W.) Spence, Texas Instruments

RE: Pinout Control of SCSI Round Cable Assemblies


The following note is offered as a substitute for specifying cable color 
codes.

  NOTE:  For single-ended operation, it is recommended that in cable 
  assemblies incorporating round, twisted-pair cable comprising a core 
  surrounded by two or more layers of twisted pairs, the following principles 
  be observed to the extent practical:
  (1) The REQ and ACK pairs should be in the core.  If there are more than two 
  pairs in the core, the remainder should contain ground pairs.
  (2) The data and parity pairs should be in the outer layer(s).