Compaq StorageWorks UltraSCSI RAID Enclosure (DS-BA370 Series) User's Guide (EK-BA370-UG. C02, September 1998)

Glossary
Glossary–2 UltraSCSI RAID Enclosure
ambient air temperature
The temperature of the air surrounding the cabinet, enclosure, shelf,
or SBB that dissipates the heat generated by the device.
See also
intake air temperature
.
array controller
See
controller
.
backplane
The electronic printed circuit board mounted in the rear of the shelf.
This board contains the disk drive SBB, power supply, and
terminator connectors
.
blowers
An airflow device mounted in a StorageWorks shelf.
bus expander
Devices that couple bus segments together without any impact on the
SCSI protocol, or the software. These devices include both
single-ended to differential and single-ended to single-ended bus
extenders. The term expander is a general term that includes
“extender,” “repeater,” and “isolator.”
bus extender
See
bus expander
.
bus segment
A SCSI bus segment consists of all the conductors and connectors
required to attain signal line continuity between every driver, receiver,
and two terminators for each signal. It is not necessary that a SCSI
bus segment contain any
initiators
or targets, but it must have at least
two devices attached. (Drivers and receivers can be part of extenders
as well as part initiators and targets.)
Bus segments can be either single-ended or differential. The
terminator properties determine the bus segment type. Devices that do
not have the same transceiver type as the terminators cannot operate
in the segment defined by the terminators.