ATTO Technology ATTO ExpressPCI Ultra/WIDE SCSI Host Adapters Express PCI PSC: Single-Channel Single-Ended Ultra/WIDE ExpressPCI DC: Dual-Channe Installation And Operation Manual page 13

host adapters supply
Termination power:
termination power to the bus at all times and many
SCSI devices are also able to supply termination
power. SCSI signal quality, particularly with long
or marginal quality cables, may be improved if the
device supplies the termination power. Contact
your device manufacturer for more information
on your device's ability to supply termination
power.
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