Installation guide

Glossary-14 SPARC Enterprise Mx000 Servers Glossary • March 2012
System Controller (SC) A bridge ASIC that connects the CPU, memory, and I/O. It also controls
cache coherency.
T
Tape Drive Backplane
(TAPEBP)
The backplane for a tape drive unit. See also Backplane (BP).
tape drive unit A tape device used to read data stored on magnetic tape, or write data to it.
thread The minimum unit of hardware in the CPU core or multi-threading CPU chip
that can be recognized by the software,
TTY-bus The serial bus to bridge the console path data between the CMU and XSCF.
U
UE See Uncorrectable Error (UE).
unassign A term used in Dynamic Reconfiguration to release a system board that is
assigned to a domain.
unconfigure A term used in Dynamic Reconfiguration to isolate a system board that has
previously been integrated into the OS of a domain and putting the system
board in the assigned or unassigned state.
Uncorrectable Error (UE) An uncorrectable memory error, such as a DIMM multi-bit error.
Uni-XSB One of the PSB division types. A PSB that logically consists of only one unit
(undivided state) is called a Uni-XSB. Uni-XSB is the initial value before
division types are defined for a PSB. Uni-XSB is used to explain the PSB
division type or status.
Uninterruptible Power
Supply (UPS)
A unit that ensures a stable supply of power to the system in the event of a
power failure or an extensive power interruption.
UPS cable A cable that connects the UPS Controller (UPC) port and the UPC interface on
UPS.
UPS Controller (UPC) A device that controls the Uninterruptible Power Supply (UPS).
UPS Controller (UPC)
port
A receiving port on the server to connect an Uninterruptible Power Supply
(UPS).