Glossary
Glossary–16 UltraSCSI RAID Enclosure
TERMPOWER
The electrical current power required for SCSI bus terminators. This power
may be supplied by an external SCSI bus, the shelf power supply or an ac–
dc power converter.
topology
The physical arrangement and relationship of interconnected nodes and
SCSI buses in a network. A legal topology must satisfy all the requirements
of the associated SCSI bus (Fast 10, UltraSCSI, and so forth).
transmission medium
An electrical conductor has bus termination on each end and possibly stubs.
Common examples of media are cables, printed wiring boards, flex circuits,
and connectors that create electrical connections between various
combinations SCSI devices, bus extenders, and terminators.
UL
Underwriters Laboratories. An organization that tests and certifies electrical
devices.
UltraSCSI
An improvement in SCSI technology invented in 1993 by the Digital
Equipment Corporation StorageWorks Engineering Group. Subsequently
the ANSI SCSI standards committee issued standard X3T10 for UltraSCSI.
The UltraSCSI improvements over Fast SCSI include the following:
•
Maximum transfer rate increases from 10 MHz to 20 MHz
•
Maximum wide bus bandwidth increases from 20 MB/s to 40 MB/s
•
VHDCI (very high density cable interconnect) cables and connectors
are significantly thinner and smaller
UltraSCSI domain
A single, logical UltraSCSI bus composed of multiple diverse bus segments.
See also bus segment.
UltraSCSI RAID enclosure
A 24-SBB RAID shelf, such as the DS–BA370.
Summary of Contents for StorageWorks UltraSCSI DS-BA370 Series
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