Acer PCI to Ultra SCSI RAID Controllers DAC960PG - Manual (Page 17)

Preinstallation Planning
Manual No. 775012 2-3
Figure 2-1. DAC960 Controller Termination Examples
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Note
For this discussion, assume that the illustrated internal
and external connectors are both on the same channel.
It is better to terminate the ends of the SCSI bus itself
than it is to terminate the end devices on the bus. This
allows hot swap devices to be added or removed from
the SCSI bus without affecting termination.