Signal Integrity Issues to Consider When Upgrading to Ultra320 SCSI (PDF)
When upgrading an Ultra160 SCSI system to Ultra320 SCSI, there are several issues that you need to be aware of or your system will not function at the speed that Ultra320 SCSI promises. This white paper, contributed by Seagate, provides advice on what to watch for and how to make and measure adjustments to signal integrity margining.

Introduction
Most developers would like to implement Ultra320 Small Computer System Interface
(SCSI) by plugging in a new Ultra320 Host Bus Adapter (HBA) and new Ultra320 SCSI
drives in place of the corresponding Ultra160 SCSI components. There are, however,
several additional issues that need to be resolved before one can be assured that they have
a reliable new system operating at twice the data rate of the old. Software, firmware and
protocol issues must be addressed, resolved and verified. This paper deals with one of the
basic sets of parameters that need to be determined regarding the environment in which
the new equipment is operating.