NonStop NS-Series Planning Guide (H06.03+)

Glossary
HP Integrity NonStop NS-Series Planning Guide—529567-004
Glossary-10
shielded twisted pair (STP)
NonStop S-series servers but are optional on earlier servers. Service-side doors are
cosmetic and are not required for system cooling.
shielded twisted pair (STP). A transmission medium consisting of two twisted conductors
with a foil or braid shield. Contrast with unshielded twisted pair (UTP).
signal reference grid. A series of conductors, constructed of pure or composite metals (for
example, copper) with good surface conductivity. A superior signal reference grid is
installed on the subfloor of a computer room and connected to the raised-floor
structure to establish constant and equal potential for all equipment in the computer
room that is connected to it.
single-LSU configuration. The hardware configuration in which each logical processor has
one LSU (and therefore a connection to two ServerNet fabrics).
sinusoidal. A waveform that can be mathematically expressed by the sine function.
skin effect. The tendency of higher frequency signals to flow on the outside surface, or
skin, of a conductor instead of through the entire cross-section of the conductor. The
result is less total conductor area available for carrying current and an increase in the
resistance of the conductor at that high signal frequency.
slice. A portion of one or more logical processors and one part of a processor complex. A
slice consists of a chassis, processor board containing one or more processor
elements and memory, I/O interface board, midplane, optics adapters, fans, and power
supplies. Also called a processor slice.
stackable enclosure. An enclosure that can rest on top of another enclosure. A stackable
enclosure is not installed on a frame base.
standby power generator. A turbine-driven or engine-driven generator that provides a
backup source of power to designated loads. Often used to supplement an
uninterruptible power supply (UPS) in the event of extended utility outages.
storage subsystem. A subsystem of the HP NonStop™ operating system that handles
configuration and management of disk and tape devices in G-series and H-series
release version updates (RVUs).
surge. An increase in the amplitude of source voltage of short duration.
SWAN concentrator. See ServerNet wide area network (SWAN) concentrator.
SWAN 2 concentrator. See ServerNet wide area network (SWAN) 2 concentrator.
system. All the processors, controllers, firmware, peripheral devices, software, and related
components that are directly connected together to form an entity that is managed by
one HP NonStop™ operating system image and operated as one computer.
system engineer (SE). See service provider.