Glossary-1
Glossary
AC off state
One of the system power states in which all power is
removed 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 global 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 monitoring and control subsystem,
managed by the system control manager (SCM), and
which provides a command language used by the
operator.
Directory module
Module on the QBB that monitors memory requests
and holds the location of the accurate copy of memory
data requested. A memory directory module is not
needed in a system with only one QBB. In a system
with more than one QBB, each QBB needs a directory
module.
Distribution board
The interface between the global ports of two QBBs.
Expander cabinet
A cabinet that holds additional storage shelves and PCI
boxes.
Global port
Module that plugs into a QBB that provides the
interface between the QBB and the hierarchical switch.
