HP Array Controller HSG V8.7 Software - Manual (Page 200)

Glossary
Glossary–12 UltraSCSI RAID Enclosure
redundant power supply configuration
A capability of StorageWorks cabinet and shelves to ensure that there
is no single point of power failure. (1) For a cabinet, two ac power
sources and two distribution units or ac input boxes distribute primary
and redundant ac power to shelf power supplies. (2) For a shelf, the
primary and redundant shelf power supplies ensure that the dc power
is available even when there is a failure of one supply, one ac source,
or one distribution unit or ac input box.
RFI
Radio frequency interference. The impairment of a signal by an
unwanted radio signal or radio disturbance.
SBB
StorageWorks building block. The basic building block of the product
line. Any device conforming to shelf mechanical and electrical
standards installed in either a 3.5-inch or 5.25-inch carrier is
considered to be an SBB, whether it be a storage device, a power
supply, or other device.
SCSI
Small computer system interface. This ANSI interface defines the
physical and electrical parameters of a parallel I/O bus used to
connect computers and a maximum of seven devices.
SCSI bus ID
The bit-significant representation of the SCSI addressing referring to
one of the signal lines numbered 0 through 7 for an 8-bit bus or 0
through 15 for a 16-bit bus. Also known as SCSI device ID and target
ID.
SCSI bus signal converter
(1) A connecting device that permits the attachment of accessories or
provides the capability to mount or link units. (2) The device that
connects a differential SCSI bus to a single-ended SCSI bus. (3) The
device that extends the length of a differential or single-ended SCSI
bus.