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Cables are one of the most important considerations in Ultra SCSI systems. Ultra SCSI allows for a maximum total cable length of only 1.5 meters (all cables totaled). There should also be at least six inches between devices (ten inches is preferred and twelve is optimal), for proper communication. Add to this the fact that a large percentage of cables are out of tolerance concerning the SCSI specifications. This is further exacerbated by the use of both internal and external cables, which will frequently cause impedance mismatches. Our recommendation is to use quality twisted-pair or Teflon ribbon cables that are properly shielded if being used externally.
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