NonStop S-Series Hardware Installation and FastPath Guide (G06.25+)

Glossary
HP NonStop S-Series Hardware Installation and FastPath Guide—529443-001
Glossary-121
unattended site
In the Open System Services (OSS) environment, the UID is the scalar view of the HP
NonStop™ operating system user ID. The UID is used in the OSS environment for
functions normally associated with a UNIX user ID.
unattended site. A computer environment where no operator resides on site and the only
access is from a central monitoring station.
uncorrectable memory error (UCME). An error caused by incorrect data at a particular
memory location. The cause of the error is such that the error is not automatically
corrected by the system, and memory replacement is required. Contrast with
correctable memory error (CME).
undefined. Pertaining to the use of an incorrect value for data or the incorrect behavior of a
program for which the ISO/IEC IS 9945-1:1990 standard imposes no portability
requirements.
undervoltage. A negative change in the amplitude of the voltage.
unicode. A 2-octet (2-byte) character code designed to represent more alphabetic and
graphic characters than allowed by the ASCII character set. When the first octet of a
unicode character is zero, the second octet maps to the ISO 8859-1 (ASCII) character
set. Unicode is the standard character set for encoding characters in implementations
of the Java language and is the default character code set used by several Microsoft
Windows operating systems.
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.
unitary segment. See segment.
unmount. To make a fileset inaccessible to the users of a node.
unplanned outage. Time during which a computer system is not capable of doing useful
work because of an unplanned interruption. Unplanned interruptions can include
failures caused by faulty hardware, operator error, or disaster.
unshielded twisted pair (UTP). A transmission medium consisting of two twisted
conductors with no cable shielding. Contrast with shielded twisted pair (STP).
unspecified. Pertaining to the use of a correct value for data or the correct behavior of a
program for which the ISO/IEC IS 9945-1:1990 standard imposes no portability
requirements.
UPS. See uninterruptible power supply (UPS).