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Glossary-1
Glossary
AC off state One of the system power states in which all power is re-
moved from the system. See also Hot-swap, Cold-swap,
and Warm-swap states.
Clock splitter
module
Module that provides the system with multiple copies of
the system and I/O reference clocks.
Cold-swap state One of the system power states in which AC power and
Vaux are present in the system, but power is removed
from the area being serviced. See also AC off, Hot-swap,
and Warm-swap states.
Console serial bus
See CSB.
CSB Console serial bus; a bus that runs throughout the sys-
tem and connects microprocessors used for monitoring
and control of the system. The CSB is managed by the
system control manager (SCM).
Directory module Module that monitors memory requests made to the
QBB on which it resides and is used to maintain cache
coherency. When a memory request is made to a QBB
that does not have the latest copy of the requested data,
the directory module of the QBB forwards the request to
the CPU that owns the latest data.
Distribution board The interface between the global ports in a system with
only two QBBs.
Expander cabinet A cabinet that holds additional storage shelves and PCI
boxes.
Galaxy OpenVMS software that is used to manage soft
partitions.
Global port Module that provides the interface between QBBs
through the hierarchical switch or distribution board.