Open SCSI Integrator's Manual for NonStop S-Series Servers

Glossary
Open SCSI Integrator’s Manual for NonStop Servers—422988-002
Glossary-2
backplane
backplane. A board that has connectors, on one or both sides of the board, into which circuit
board assemblies plug. Backplanes are located behind card cages.
backup processor. A processor in the HP NonStop operating system that communicates with
the primary processor, allowing the processors to remain independent. A component
failure in one processor has no effect on any other processor. Contrast with primary
processor.
base enclosure. An enclosure that is placed on the floor and can have other enclosures
stacked on top of it. A base enclosure is installed on a frame base. Contrast with
stackable enclosure
.
battery load. The electrical current drain imposed on a battery.
BIC. Backplane interconnect card. Not applicable to Himalaya S-series servers. See
ServerNet adapter
.
bit-synchronous. A type of Open Systems Interconnection (OSI) Layer-2 protocol that uses
synchronous transmission but does not require a character code to define terminal and
line control sequences.
block. A grouping of one or more system enclosures that a Himalaya S-series system
recognizes and supports as one unit. A block can consist of either one processor
enclosure, one I/O enclosure, or one processor enclosure with one or more I/O
enclosures attached.
cable channel. A cable management conduit that protects the cables that run between two
system enclosures in a double-high stack. Each system enclosure has two cable channels
running vertically on its service side: one on the left-hand side of the enclosure, and one
on the right-hand side of the enclosure.
cable guidepost. A cable management rod that routes cables exiting the upper enclosure in a
double-high stack to prevent the cables from hanging down in front of the
customer-replaceable units (CRUs) in the base enclosure. A cable guidepost extends
from the base of each cable channel.
cable support. A piece of cable management hardware that secures system cables. The cable
support attaches to the service side of a system enclosure near the bottom of the
enclosure. Cable ties for securing system cables are threaded through the cable support.
The cable support also contains the group and module ID labels and the rear group
service light-emitting diode (LED).
cache (cache memory). A small, fast memory holding recently accessed data designed to
speed up subsequent access to the same data. Cache memory is built from faster
memory chips than main memory, and it is most often used with process or main
memory but also used in network data transfer to maintain a local copy of data.
card cage. A structure made up of slots that hold components such as customer-replaceable
units (CRUs) and ServerNet adapters.