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Glossary
AC input box
Receives three-phase AC power and outputs that to the power regulators.
The system circuit breaker and a Dranetz port are on the AC input box.
See also Power.
Address space
See Physical address space and Virtual address space.
Alpha primary boot program (DEC 7000 system)
The Alpha primary boot program (APB.EXE) that boots OpenVMS Alpha
AXP. APB is the primary bootstrap program and is stored on the boot de-
vice.
Asymmetric multiprocessing
A multiprocessing configuration in which the processors are not equal in
their ability to execute operating system code. In general, a single proces-
sor is designated as the primary, or master, processor; other processors are
the slaves. The slave processors are limited to performing certain tasks,
whereas the master processor can perform all system tasks. Contrast with
Symmetric multiprocessing.
Bandwidth
The data transfer rate measured in information units transferred per unit
of time (for example, Mbytes per second).
Battery backup
Provides power to the entire system cabinet (or to an expander cabinet) in
the event of a power failure. A system can maintain power for approxi-
mately 11 minutes. Each power regulator requires a battery pack of four
batteries.
Boot device
A storage device that holds the software that carries out the system boot-
strap process.
Glossary-1
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