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

Glossary
HP Integrity NonStop NS-Series Planning Guide—529567-004
Glossary-11
system serial number
system serial number. A unique identifier, typically five or six alphanumeric characters,
assigned to an HP NonStop™ server when it is built.
TMR. See triplex.
transient. A short-duration, high-amplitude impulse that is imposed on the normal voltage or
current.
triple-modular redundancy (TMR). See triplex.
triplex. Having three active processor elements per logical processor. Also called triple-
modular redundancy (TMR).
undervoltage. A negative change in the amplitude of the voltage.
uninterruptible power supply (UPS). The equipment used to provide an uninterruptible
source of power to connected equipment if a main power outage occurs. The basic
components of any UPS system are a rectifier/charger that converts alternating-current
(AC) power to direct-current (DC) power, batteries that store the DC power, and an
inverter that converts the DC power back into AC power for distribution to the load.
unshielded twisted pair (UTP). A transmission medium consisting of two twisted
conductors with no cable shielding. Contrast with shielded twisted pair (STP).
UPS. See uninterruptible power supply (UPS).
V. See volt (V).
V.35. The International Telecommunications Union, Telecommunication Standardization
Sector (ITU-T) standard for data transmission at 48 kilobits/second over 60 - 108
kilohertz group band circuits. It contains the 34-pin V.34 connector specifications
normally implemented on a modular RJ-45 connector. V.35 is the equivalent of
Electronics Industry Association (EIA) RS-422/RS-449.
V AC. Volts of alternating current.
volt (V). The standard unit of measure of the potential difference that is required to move an
electric charge.
voting. Comparison of I/O output streams from one to three processing elements.
WAN. See wide area network (WAN).
wide area network (WAN). A network that operates over a larger geographical area than a
local area network (LAN); typically, an area with a radius greater than one kilometer.
The elements of a WAN can be separated by distances great enough to require
telephone communications.