NonStop System Glossary

adjacent SP
A service processor (SP) that is directly connected through the ServerNet fabrics to the enclosure
of a specified SP.
administrator
1. For a NonStop system, the person responsible for the installation and configuration of a software
subsystem on a NonStop node. Contrast with operator.
2. For an IBM system, the person responsible for the day-to-day monitoring and maintenance tasks
associated with a software subsystem on an IBM node.
3. For a UNIX system, the owner of /dev/console. The administrator is responsible for the
installation and configuration of all hardware and software within a node.
ADP
See application development environment (ADE).
Advanced Cluster Hub (ACH)
A passive optic component used to connect the nodes with a BladeCluster zone along a fabric. A
BladeCluster zone requires one Advanced Cluster Hub in each of the X and Y fabrics.
AH
See authentication header (AH).
ALLPROCESSORS paragraph
A required paragraph in the CONFTEXT configuration file that contains attributes defining the
NonStop operating system image for all system processors. The ALLPROCESSORS paragraph
follows the optional DEFINES paragraph.
alternate path
A path not enabled as the preferred path. An alternate path can become a primary path when a
primary path is disabled.
alternating current (AC)
An electric current having a waveform that regularly reverses in positive and negative directions.
North American electrical power alternates 60 times/second (60 hertz). European electrical power
alternates at 50 hertz. Contrast with direct current (DC).
amperage
Current-carrying capacity, expressed in amperes.
ampere (A)
The unit of electrical current or rate of flow of electrons. One volt across one ohm of resistance
causes a current flow of one ampere. A flow of one coulomb/second is defined as one ampere
of current.
ANSI
The American National Standards Institute.
A 45