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device
In this manual, refers to the peripheral units that are attached to the SCSI/parallel
adapter card.
device adapter
See adapter.
differential signal
Also referred to as “balanced signal”. During electrical transmission and reception,
signals are detemined by the difference between two lines that are both at different
voltages relative to ground. Differential SCSI signals can be used over longer
distances and at higher data rates. A differential SCSI bus is incompatible with a
single-ended SCSI bus. Therefore, differential SCSI devices may not be used with the
SCSI/parallel adapter card. See also, single-ended signal.
filler card
In some HP-PB computers, a removable plastic plate that is installed in HP-PB I/O
slots when the slot is not in use.
FRU
Field Replaceable Unit. The lowest level of hardware supported for field
replacement, such as to effect repair.
hardware path
The collection of hardware addresses that uniquely identify hardware elements (such
as adapter cards and peripheral devices) to the computer system.
high-density connector
In reference to the adapter card’s SCSI port, a 50-conductor connector consisting of
two rows of 25 contacts with adjacent contacts 1.27 mm (0.05 in) apart. See also,
low-density connector.
host
In this manual, the computer in which the adapter card is installed.
2 Glossary