The original SCSI interconnect was implemented with 8 data lines and a few control lines. The parallel bus architecture evolved to higher bandwidth via wider data path and higher clock speed. The signal skew problem limited the distance of the parallel SCSI interconnect. Also, each daisy chained SCSI string is limited to 16 SCSI ID, which caps the capacity.
For direct attached SCSI configuration, SAS addresses the limitation of parallel SCSI.
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